Yazarlar
- Tozlu, Alperen(15)
- Kul, Sinan(13)
- Kutlu, Naciye(12)
- Cuce, Erdem(8)
- Cuce, Pinar Mert(8)
- Uçurum, Metin(8)
- Gökçe, H.S.(7)
- Kamiloğlu, Aybike(7)
- Özahi, Emrah(6)
- Şahin, Engin(6)
- Ayata, Ümit(5)
- Ecem Bayram, Nesrin(5)
- Ekmekyapar Torun, Fatma(5)
- Guclu, Tamer(5)
- Gökçe, H. Süleyman(5)
- Serencam, Huseyin(5)
- Yilmaz, Fatih(5)
- Özdemir, Akın(5)
- Bayram, Sinan(4)
- Cengiz, Ibrahim(4)
- Elbir Abca, Tuğba(4)
- Gerçek, Yusuf Can(4)
- Gökçe, H. S.(4)
- Karbancioglu-Guler, Funda(4)
- Mercan, Emin(4)
- Serencam, Hüseyin(4)
- Sert, Durmuş(4)
- Teke, Çağatay(4)
- Torun, Fatma Ekmekyapar(4)
- Tozlu, A.(4)
- İrdemez, Şahset(4)
- Abusoglu, Aysegul(3)
- Abuşoğlu, Ayşegül(3)
- Baştürk, Fatma Nur(3)
- Bingül, Züleyha(3)
- Can, Zehra(3)
- Duran, Celal(3)
- Kamiloğlu, Hakan Alper(3)
- Karakaş, İbrahim Hakkı(3)
- Kırkıncı, Seran(3)
Yayınlar
- MakaleAçık Erişim2024Derin ötektik çözücülerin portakal kabuğundan biyoaktif bileşiklerin ekstraksiyonuna etkisi
Kantar, Naciye Kutlu; Hacıbektaşoğlu, Hanife
Atık değerlendirme kapsamında en önemli meyve atıklarından biri olan portakal kabuğuna alternatif kullanım alanı oluşturmak adına bu çalışma planlanmıştır. Çalışmada, öncelikle organik çözücülerin (etanol, metanol ve su) yerine alternatif olabilecek farklı tipte derin ötektik çözücüler kullanılarak ultrasonik destekli ekstraksiyon yöntemi eşliğinde portakal kabuğu ekstraktları hazırlanmış olup bu ekstraktların biyoaktif bileşik içerikleri (toplam fenolik bileşik, toplam flavonoit bileşik, antioksidan aktivite ve bireysel fenolik bileşik profili) değerlendirilmiştir. Sonuç olarak, derin ötektik çözücülerin en yüksek toplam flavonoit madde ve antioksidan aktivite değerlerinin sağlanmasında istatistiksel olarak etkili olduğu belirlenmiştir. Ayrıca bireysel fenolik bileşik profili incelendiğinde en baskın bileşenin hesperidin olduğu görülmüş ve en yüksek değere kolin klorür:gliserol (1:2) kombinasyonu ile ulaşılmıştır. Sonuçta derin ötektik çözücülerin portakal kabuğundan fitokimyasal bileşiklerin ekstraksiyonunda organik çözücülere alternatif olabildikleri saptanmıştır.
- MakaleAçık Erişim2024Decolorization of acid yellow 17 by ozonation and peroxone (O3/H2O2) process
Cengiz, Ibrahim
In this study, the decolorization of Acid Yellow 17, a mono azo dye with a wide range of applications such as in food, textiles, personal care products, and household cleaning products, was investigated in aqueous solutions using ozonation and peroxone processes. The effects of ozone gas flow rate (150, 200, and 250 L/h), ozone gas concentration (5.5, 11, and 16.5 g/m3), initial dye concentration (100, 200, and 300 mg/L), and hydrogen peroxide concentration (25, 50 and 62.5 mg/L) on decolorization in the batch bubble reactor were investigated. When the ozone gas flow rate was increased from 150 L/h to 200 L/h in the ozonation process, the removal efficiency increased from 70% to 80.2%. At gas flow rates above 200 L/h, removal was negatively affected. The removal efficiency increased with increasing ozone gas concentration, and at the end of the 45-minute reaction time, a removal efficiency of 98% was achieved at an ozone gas concentration of 16 g/m3. The increase in initial dye concentrations decreases the removal efficiency due to the increase in the amount of pollutant per unit ozone molecule. In the peroxane process, the effect of hydrogen peroxide on color removal was limited. It was determined that the ozonation process was more effective for the removal of Acid Yellow 17 from aqueous solutions.
AtıfOpenAlex1
İncele - MakaleAçık Erişim2024Usability of calcite mineral, which develops in the crack fillings of carbonate rocks, as ornamental stone
Camuzcuoğlu, Murat
Turkey has a significant amount of mineral content from a geological perspective, offering essential resources, especially in mining (ornamental stone production). In this study, methods are being developed for the extraction, processing, and usability of calcite minerals, which develop as vein fillings (secondary formations) among fragmented limestone along the Bayburt-Erzurum highway for ornamental stone use. The chemical and crystallographic properties of the mineral were determined through XRD and FTIR analyses, and its suitability for ornamental stone use was evaluated. (durable, clean, and transparent) epoxy was used as a binding material for ornamental stone production, and the use of calcite minerals in jewelry production was examined, revealing its potential economic value in terms of durability, aesthetics, and rarity. Generally, while calcite minerals are widely used in various industrial fields, their use as ornamental stones remains limited. This study presents a new perspective on evaluating calcite minerals as ornamental stones, demonstrating the possibility of processing a low-hardness mineral as an ornamental stone using binding materials and its potential economic value. These findings significantly evaluate natural minerals in different applications and enhance their financial potential.
AtıfOpenAlex1İncele - Kitap BölümüAçık Erişim2024Utilization of Fruit and Vegetable Wastes in Food Packaging
Yildiz, Aysun Yurdunuseven; Öztekin, Sebahat
Today, the most preferred materials used in food packaging are non-degradable petroleum-based plastic polymer materials due to their high barrier and mechanical properties. These polymer materials are not sustainable due to limited petroleum resources. These non-biodegradable materials pose a serious problem for the environment and affect the entire ecosystem. In recent years, as an alternative to traditional materials for food packaging, the demand for the development of environmentally friendly packaging materials has increased in order to reduce and/or limit the negative impact on the environment. The increasing interest in environmental issues and human health has led to the investigation of possible matrices for bio-packaging in the field of food packaging. In this context, there is an increasing interest in the utilization of fruit and vegetable wastes such as peels, pips, seeds, and leaves. Fruit and vegetables are among the most widely consumed products worldwide, and their waste is the most abundant food waste. These wastes, which are released after fruit and vegetable processing and contain valuable components, can cause environmental pollution if not managed properly. The management of this large amount of waste is difficult, and it is usually either disposed of in water sources and open storage areas or used as feed or compost. However, these wastes have the potential to be used as raw materials for the development of value-added products. Due to their abundant availability and biodegradability, these wastes can solve the major problems associated with conventional plastics used for food packaging and improve sustainable development and life cycles. A more sustainable and greener world can be targeted with these biodegradable materials. This chapter focuses on the conversion of fruit and vegetable waste into environmentally friendly food packaging systems. The chapter emphasizes the advantages and disadvantages of using fruit and vegetable waste as food packaging material and its potential applications. In this context, all mentioned aspects have been comprehensively reviewed, taking into account the literature reported in the last five years. Before processing fruit and vegetable wastes into packaging materials, some steps, such as extraction and purification, are necessary. Materials derived from these wastes have the potential to be used in food packaging with various advantages, such as non-toxicity, biodegradability, and abundant availability. However, there is also a great debate about the applications of these food packaging materials. Further research is needed to improve the barrier and mechanical properties of packaging materials derived from fruit and vegetable waste. Most bioplastics do not meet the basic requirements of food packaging in terms of barrier and mechanical properties, and various modifications are needed to improve their properties. Therefore, future studies should focus on the necessary research to improve the barrier and mechanical properties of materials derived from these wastes. Finally, the legal framework for the large-scale use of these biomaterials derived from fruit and vegetable wastes in food packaging is insufficient, and this may affect the commercialization and consumer acceptance of the products.
AtıfScopus3OpenAlex3
İncele - Kitap BölümüAçık Erişim2024Smart and Sustainable Energy Systems
Guclu, Tamer; Cuce, Pinar Mert; Cuce, Erdem
Today, fossil fuels still have a more important share in energy production. Reducing the share of these resources in energy production is an extremely important issue in order to prevent the environmental effects caused by greenhouse gas emissions. Especially in the last ten years, the transformation into smart and sustainable energy systems has accelerated in order to use energy resources efficiently and to reduce greenhouse gas emissions. Smart energy systems are systems that allow the use of renewable energy sources such as solar, wind, and geothermal instead of a fossil fuel-based large production system. Thanks to these systems, instead of a single large power generation facility, energies produced from renewable sources close to the area of use can be integrated into the system, thus reducing greenhouse gas emissions. In addition, smart energy systems are effective in reducing energy costs, as they make final consumers a part of energy production. In addition, since smart energy systems allow the integration of sectors such as electricity, heating, energy, transportation, and transmission, they provide a sustainable, accessible, economical, clean, and efficient energy supply. In this study, information about smart and sustainable energy systems has been given, advantages and difficulties have been mentioned, and also an economic evaluation has been made.
AtıfScopus2OpenAlex2İncele - MakaleAçık Erişim2024Scopus SJRQ4SILVER AND ZINC NANOPARTICLES BIOSYNTHESIS USING LAUREL EXTRACT AND INVESTIGATION OF THE PHOTOCATALYTIC PROPERTIES
Taş, Recep; Köroğlu, Ebru; Karakuş, Ahmet; Bülbül, Ali Savaş; Taş, Nilay Akkuş
Metal nanoparticles that are widely studied in optoelectronics, catalysis, medicine, and sensors offer remarkable optical and electronic properties. To address the cost and environmental concerns associated with their synthesis, this study employs an environmentally friendly method using Laureus nobilis extract to produce silver and zinc nanoparticles, which are prominent in nanotechnology. This study includes investigations of factors such as reaction time, AgNO3/laurel ratio, Zn(Ac)2 H2O/laurel ratio and temperature in nanoparticle biosynthesis to optimize the process. The next stage was set to evaluate the photocatalytic performance of these nanoparticles, specifically against the methylene blue dye under dark and UV light conditions. Parameters such as pollutant decomposition, degradation rate, catalyst stability, and nanoparticle recovery were analysed. Structural characterization of the obtained nanoparticles was performed using UV-Vis, FTIR, SEM, and XRD techniques. The photocatalytic results showed significant degradation percentages for LB-AgNP (silver nanoparticles synthesized with Laureus nobilis extract) (97.5%) and LB-ZnNP (zinc nanoparticles synthesized with Laureus nobilis extract) (90.9%). LB-ZnNP showed superior performance. Therefore, LB-AgNP and LB-ZnNP are promising photocatalysts for water purification and the elimination of toxic organic pollutants.
AtıfScopus1WoS1OpenAlex1
İncele - MakaleAçık Erişim2024Scopus SJRQ1Ultrasound-assisted deep eutectic solvent extraction of bioactive compounds from persimmon calyx
Kutlu, Naciye; Kamiloğlu, Aybike; Abca, Tuğba Elbir; Yilmaz, Özlem
Abstract: This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from persimmon (Diospyros kaki) calyx by deep eutectic solvents (DES) with different molar ratios. For this reason, the prepared DES extracts’ total phenolic–flavonoid compounds and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity [DPPH•], Cupric Reducing Antioxidant Capacity (CUPRAC), and ferric reducing antioxidant power [FRAP]) were investigated as a result of the experimental design and optimization study conducted for this purpose. A sonication time of 20 min was determined as the optimal condition. Under these conditions, a molar ratio of 1.9:1 (lactic acid:choline chloride) and a water ratio of 70% provided the highest phenolic/flavonoid compounds and antioxidative activity. Correlations among water ratio, molar ratio, and sonication time were determined using principal component analysis (PCA). In conditions where total flavonoid compound, FRAP, and DPPH• are high due to PCA, it can be concluded that the sonication time is at high level; on the contrary, the water and molar ratios are at low level. In conclusion, ultrasound-assisted extraction using DES proved effective in persimmon calyx. Therefore, it can be recommended to use these environmentally friendly green solvents as an alternative to organic solvents in preparing extracts in various fields. Practical Application: This study shows the effectiveness of the ultrasound-assisted green extraction method using persimmon calyx specified as waste. These findings are compelling in the food industry in terms of consumers being now aware of green technology and the discovery that calyx is a good source of bioactive compounds.
AtıfScopus19WoS21OpenAlex23
İncele - MakaleAçık Erişim2024Scopus SJRQ1District heating based on exhaust gas produced from end-of-life tires in Erzincan: Thermoeconomic analysis and optimization
Güngör, Osman; Tozlu, Alperen; Arslantürk, Cihat; Özahi, Emrah
This paper presents the thermoeconomic analysis and optimization of the Erzincan Waste Tire Recycling and Power Plant (EWTRPP) in Turkey and its waste heat-based district heating (DH) system. A thermoeconomical method, namely the specific exergy costing (SPECO), is applied to allocate cost flows through subcomponents of an actual existing plant. Besides, the obtained thermoeconomic results are improved by using an optimization method, namely non-dominant sorting genetic algorithm (NSGA-II), considering the temperature of the exhaust gas discharged to the atmosphere (T25), the thermal conductivity value of the insulation material (ki) and pipe roughness value (s). The energy and exergy efficiencies of the existing plant are found to be 27.37% and 35.57%, respectively, considering the data of the actual plant. Moreover, the energy and exergy efficiencies of the waste heat-based DH system are found to be 43.08% and 55.99%, respectively. The total cost rate of the overall system is deduced 13.98 $/hby means of SPECO method. According to the results of the NSGA-II optimization method, the exergy efficiency and total cost rate of the overall system are evaluated as 6.93% and −2.51 $/h, respectively. Furthermore, it is also proposed that 1304 dwellings can be heated owing to the DH system utilizing the existing exhaust gas.
AtıfScopus9WoS8OpenAlex7İncele - MakaleAçık Erişim2024Scopus SJRQ3Durability of slag-based alkali-activated materials: A critical review
Gökçe, H.S.
As the world becomes increasingly aware of the devastating effects of climate change, the need for sustainable building materials that are both durable and environmentally friendly increases. Geopolymer and alkali-activated materials formed by a chemical reaction between an alkaline activator solution and an aluminosilicate source have gained popularity in recent years. The alkaline activator solution dissolves the aluminosilicate source, which then undergoes a polycondensation reaction to form a three-dimensional geopolymeric gel network. The development of this network ensures the strength and durability of the material. Today, this phenomenon of durability has been studied in detail to enable the development of superior construction materials, taking into account degradation mechanisms such as carbonation, leaching, shrinkage, fire, freezing and thawing, and exposure to aggressive environments (chlorides, acids, and sulphates). Although there are many unsolved problems in their engineering applications, slag-based alkali-activated materials appear to be more advantageous and are promising as alternative materials to ordinary Portland cement. First of all, it should not be ignored that the cure sensitivity is high in these systems due to compressive strength losses of up to 69%. Loss of strength of alkali-activated materials is considered an important indicator of degradation. In binary precursors, the presence of fly ash in slag can result in an improvement of over 10% in compressive strength of the binary-based alkali-activated materials after undergoing carbonation. The binary systems can provide superior resistance to many degradation mechanisms, especially exposure to high-temperature. The partial presence of class F fly ash in the slag-based precursor can overcome the poor ability of alkali-activated materials to withstand high temperatures. Due to the desired pore structure, alkali-activated materials may not be damaged even after 300 freeze–thaw cycles. Their superior permeability compared to cementitious counterparts can extend service life against chloride corrosion by more than 20 times. While traditional (ordinary Portland cement-based) concrete remains the most widely used material in construction, geopolymer concrete’s superior performance makes it an increasingly emerging option for sustainable and long-lasting infrastructure.
AtıfScopus69WoS63OpenAlex70İncele - MakaleAçık Erişim2024Scopus SJRQ2Gelatine-Based Biopolymer Film Produced from Ozone-Treated Film-Forming Solutions Containing Whey Protein Concentrate: Effects on Physical, Mechanical, and Thermal Characteristics
Mercan, Emin
This study aimed to determine the effects of the ozone treatment of film-forming solutions (FFSs) containing whey protein concentrate (WPC) and gelatine on biopolymer films’ physical, mechanical, and thermal properties. Film samples were produced from a FFS that was ozone-treated at 0 (control), 5, 10, and 30 min. Ozone treatment caused an increase in the pH values of the FFS, whereas the zeta potential remained negative. The films became lighter in colour, slightly greenish, and more opaque with longer ozonation times. The control sample showed the highest thermogravimetric weight loss (92.15%). The weight loss of the samples decreased with increasing ozone treatment time. The application of ozone treatment on the FFS enhanced the films’ mechanical properties. Increased ozone treatment time improved the film samples’ tensile strength, elongation at break, and toughness values. In conclusion, the results of this study demonstrate that the ozone treatment of FFS containing whey protein concentrate and gelatine can significantly enhance the physical, mechanical, and thermal properties of biopolymer films. These results highlight the potential of ozone treatment as a viable method for improving the performance and quality of biopolymer films used in food packaging, offering promising advantages for sustainable and environmentally friendly packaging solutions.
AtıfScopus5WoS5OpenAlex6İncele - MakaleAçık Erişim2024Scopus SJRQ3THE EFFECT OF DIFFERENT DOSES OF LIQUID VERMICOMPOST APPLICATION ON YIELD AND YIELD COMPONENTS OF SOME POTATO (SOLANUM TUBEROSUM L.) VARIETIES
Gul, Volkan; Gidik, Betul
This is one of the early studies to produce healthy, yielding, and high-quality tubers from the potatoes grown in Bayburt, an organic agriculture basin, using liquid vermicompost that can supplement organic fertilizers. The purpose of this study was to examine the effect of liquid vermicompost applications (0, 3, 6, 9, and 12 L ha-1), which can supplement the stable manure used as bottom fertilizer, on yield and yield components of potato (Solanum tuberosum L.) varieties (Agria and Lady Olympia). The research was designed in random blocks with three replications. As a result of the study, it was found that the tuber yield was within the range of 20.24-30.40 tons’ ha-1, the protein ratio was within the range of 1.53-2.51%, and the starch ratio was within the range of 11.98%-15.99%. The liquid vermicompost doses applied to the potato varieties created significant differences in all three parameters. Due to the positive effect of the Agria (3.40 tons/da) variety on the yield and vegetative development of potatoes, It was concluded that 9 L liquid vermicompost application per decare would be beneficial.
AtıfScopus1İncele - MakaleYalnız künye2024Scopus SJRQ1Ultrasound assisted choline chloride-based deep eutectic solvent extraction of bioactive compounds from salsify (Tragopogon buphthalmoides (DC.) boiss. Var. Latifolius Boiss.): A Box–Behnken design approach for optimization
Yilmaz, Özlem; Elbir Abca, Tuğba; Kamiloğlu, Aybike; Kutlu, Naciye
This study aimed to investigate the ultrasound-assisted extraction of bioactive compounds from salsify using deep eutectic solvents (DESs) with different molar ratios. For this reason, total phenolic (TPC), total flavonoid (TFC) compounds, and antioxidant activities (1,1-diphenyl-2-picrilhydrazyl radical scavenging activity (DPPH•), and ferric reducing antioxidant power (FRAP)) of extracts prepared with DES were investigated with an experimental design and optimization study conducted for this purpose. An extraction time of 40.15 min was determined as the optimal condition. Under these conditions, a molar ratio of 3:1 (acetic acid:choline chloride) and a water ratio of 42.17 % provided the highest phenolic/flavonoid compounds and antioxidant activity. Correlations between water ratio, molar ratio, and sonication extraction time were determined using principal component analysis (PCA). In conditions where TPC, FRAP, and DPPH• were high according to PCA, it can be concluded that the extraction time, water ratio, and molar ratio are at high levels; contrarily, TFC is at a low level. In conclusion, ultrasound-assisted extraction using DES proved effective for salsify. Therefore, choline chloride-based DESs, can be recommended as environmentally friendly green solvents and an alternative to organic solvents for the extraction of bioactive compounds from salsify.
AtıfScopus11WoS8OpenAlex10İncele - MakaleAçık Erişim2024Scopus SJRQ2TOTAL PHENOLICS, TANNIN CONTENTS, ANTIOXIDANT PROPERTIES, PROTEIN AND SENSORY ANALYSIS OF Pleurotus ostreatus, Pleurotus citrinopileatus AND Pleurotus djamor CULTIVATED ON DIFFERENT SAWDUSTS
Kılıç, Ceyhun; Gürgen, Ayşenur; Yıldız, Sibel; Can, Zehra; Değirmenci, Atiye
In mushroom cultivation, it is important to be aware of the impact of the growing substrate. This study investigated the cultivation of various oyster mushrooms, including Pleurotus ostreatus, Pleurotus citrinopileatus, and Pleurotus djamor, on different types of wood sawdust. Total phenolic content, condensed tannins, antioxidant activity by ferric reducing antioxidant power assay, protein and sensory evaluations were performed in cultivated oyster mushrooms. Wood sawdust of Fagus orientalis (oriental beech), Alnus glutinosa (alder), Castanea sativa (chestnut), and Juglans regia (walnut) were used as substrate for studied mushroom type, separately. Because champignon (Agaricus bisporus) was the most consumed mushroom, it was used as control sample. Methanolic extracts of dried mushrooms were used to measure bioactive characteristics. Pleurotus ostreatus samples cultivated in Alnus glutinosa (alder) sawdust substrate had the highest antioxidant activity. The lowest antioxidant activity values were found in Pleurotus djamor cultivated in Juglans regia (walnut) wood sawdust substrate. The highest protein content was measured in Agaricus bisporus as 13,84 %. The other highest protein concentration was found in Pleurotus ostreatus cultivated in Alnus glutinosa (alder) sawdust substrate, at 13,75 %. The lowest protein concentration belonged to Pleurotus citrinopileatus cultivated in Fagus orientalis (oriental beech) sawdust substrate as 9,86 %. While Agaricus bisporus and Pleurotus ostreatus had the highest overall appreciation score, Pleurotus citrinopileatus had the lowest. It has been observed that the substrate content has an important impact on chemical and sensory properties of the oyster mushrooms. This study provides knowledge on the chemical and sensory characteristics of three different Pleurotus mushroom species cultivated on different composts.
AtıfScopus5WoS5OpenAlex5İncele - MakaleAçık Erişim2024Scopus SJRQ1Removal kinetics of vinyl acetate under aerobic and anoxic conditions in a batch bioreactor
Yalçın Çelik, Beste; Nuhoğlu, Alper; Kul, Sinan; İrdemez, Şahset
Vinyl acetate is a volatile organic compound widely used in the chemical industry, and there is a need for effective and economic removal of this volatile organic compound from wastewater and waste gases in chemical industries. This study aims to determine the biological treatability of vinyl acetate both under aerobic and anoxic conditions using mixed cultures obtained from a wastewater treatment plant. Considering the previous studies in the literature, testing the biodegradability of vinyl acetate under both aerobic and anoxic conditions, together with evaluating the effect of other mechanisms, such as adsorption and volatilization, on the removal of vinyl acetate, can be regarded as the prominent part of this study. Wastewater containing artificially prepared vinyl acetate was treated in a batch bioreactor, and performance and kinetic constants were investigated. Aerobic treatment under batch conditions conformed to the Haldane biokinetic equation, and the biokinetic constants of μmax, Ks, and Ki were calculated as 0.66 h−1, 19.67 mg L−1 and 50.56 mg L−1, respectively. Anoxic treatment under batch conditions conformed to the Monod biokinetic equation, and the biokinetic constants of μmax and Ks were calculated as 0.31 h−1 and 33.88 mg L−1, respectively. Experiments revealed that vinyl acetate was not volatile, and its adsorption and biological treatment performances were 28% and 72%, respectively. The mixed culture had a very high performance for removing vinyl acetate under batch operating conditions. The primary mechanism of vinyl acetate removal was found to be biological treatment.
AtıfOpenAlex1İncele - MakaleYalnız künye2024Scopus SJRQ2Optimization, Characterization, and Carbon Footprint Analysis of Alkali Activated Waste Tuff and Fly Ash Mixtures for Deep Mixed Columns
Kamiloğlu, Hakan Alper; Yilmaz, Fatih
Deep soil mixing (DSM) applications are one of the widely known soil stabilization techniques which can be applied to a wide range of soil types. Cement and lime are the major materials used as binders for DSM applications. However, as conventional binders lead to emit a large amount of CO2 during production, eco-friendly binders suitable for DSM applications have become prominent. Alkali-activated materials are good alternatives to conventional binders. This study was intended to investigate the usability of zeolite rich tuff wastes as an alkali-activated binder in DSM columns. Within this scope, the waste tuff and C-type fly ash mixture were used as an alkali-activated binder, and 10 M NaOH solution was used as an activator. Response surface methodology (RSM) was employed in experimental design to determine optimum components to obtain maximum unconfined compression strength and investigate the interaction between stabilization agents. From the RSM analysis the optimum ratios of activator (X1), waste tuff (X2), and precursor (X3) were determined as; X1 = 0.251, X2 = 0.548, and X3 = 0.538 for maximum UCS. UCS, mineralogical and microstructural characterization (XRF, XRD, SEM, EDX, FTIR) was performed for the DSM samples prepared considering the optimized components. It was determined that the UCS values of the 3, 7, and 28-day cured samples stabilized by considering the optimum values gave UCS values approximately 3 to 5 times higher than the lower limit values recommended by FHWA. As a result of mineralogical and microstructural investigation, the reason for the strength increase in the samples can be attributed to the formation of geopolymeric gel between the soil particles by tuff waste and fly ash activated with alkaline activator. Carbon footprint analyses were performed for 1m3 DSM columns produced with alkali-activated binders and ordinary Portland cement (OPC). From the analyses it was seen that the carbon footprint of the DSM column produced using alkali activated binders is lower than that of the DSM column obtained with OPC. After the general evaluation of the study, it is seen that the hypothesis that waste tuff can be used as environmentally safe alkali-activated binders instead of traditional binders is supported.
AtıfScopus6OpenAlex6İncele - MakaleAçık Erişim2024Scopus SJRQ3A Study on Recognizing the Value of Chestnut (Castanea sativa) Blossom Waste
Sahin, Huseyin; Kolayli, Sevgi; Kara, Yakup; Can, Zehra; Guler, Halil Ibrahim; Ozkok, Asli; Serdar, Umit
Chestnut (Castanea sativa) blossoms are natural resources that are not put to economic use. They are completely mixed with soil as waste. Thus, this extensive study was designed and remarkable results were found showing the potential usefulness of chestnut blossoms. In addition to the phenolic capacity and antioxidant capacity of the aqueous and ethanolic extracts of dried chestnut flowers, the anti-urease activity of these extracts was studied to demonstrate their therapeutic value. The binding interaction of phenolic substances present in chestnut blossom with urease was shown using molecular docking research. The aqueous extract, with most effect, had total phenolic content of 46.67 ± 0.37 mg GAE/g and total flavonoid content of 6.14 ± 0.40 mg QUE/g. The antioxidant activity was determined by FRAP (648.47 ± 5.27 µmol FeSO4.7H2O/g for aqueous extract and 347.53 ± 2.09 µmol FeSO4.7H2O/g for ethanolic extract) and DPPH (0.05 ± 0.01 mg/mL for SC50 of aqueous extract and 0.11 ± 0.01 mg/mL for SC50 of ethanolic extract) assays, and rutin was found to be the dominant phenolic compound according to HPLC. IC50 values for urease in aqueous and ethanolic extracts were 2.55 ± 0.09 mg/mL and 4.57 ± 0.24 mg/mL, respectively. According to the docking experiments, which were important to support the hypothesis of anti-urease activity, myricetin and luteolin showed different and effective bonding degrees to the target protein when compared with the reference molecule acetohydroxamic acid. In summary, chestnut flowers are rich in phenolic compounds which are responsible for a wide range of biological activities including antioxidant features and urease inhibition. These blossoms could be evaluated as potentially important raw materials for food.
AtıfScopus6WoS6OpenAlex6TR Dizin1İncele - MakaleAçık Erişim2024Scopus SJRQ1Optimization of mechanochemical surface modification parameters on planetary mill using an I-optimal experimental design
Özdemir, Akın; Uçurum, Metin
Several micro-particle-size additives and filler minerals are added to many industrial products, especially plastic, in order to reduce cost and improve mechanical properties and appearance. Also, grinding and surface modification are two fundamental properties of the filler minerals used in plastic products. Notably, Bayburt stone (BS) used as a natural raw material from Bayburt, Türkiye contains 76% SiO2 and 15% Al2O3. In this paper, the hydrophilic surface structure of micronized Bayburt stone (MBS) was made hydrophobe by mechanochemical surface modification using calcium stearate [Ca(C17H35COO)2] in a laboratory-type planetary mill. Next, the optimum conditions of the surface modification design factors, which are (1) ball filling ratio = 30.53%, (2) powder filling ratio = 10.43%, (3) mill speed = 475.91 rpm, (4) chemical dosage = 1.99% of powder, and (5) modification time = 4.83 min., were obtained using the proposed I-optimal design-focused optimization model when predicting the model parameters. In addition, a coated micronized Bayburt stone (CMBS) product with an active ratio (AR) of 99.90% and d10, d50, and d90 values of 1.32 μm, 3.48 μm and 9.55 μm were achieved. Finally, particle size distribution (PSD), thermo-gravimetric and differential thermal analyzer (TG-DTA), Fourier transform infrared (FTIR), scanning electron microscope (SEM), electron dispersive spectrum (EDS), and contact angle analyses were performed on the CMBS product.
AtıfScopus5WoS6OpenAlex6İncele - Kitap BölümüAçık Erişim2024Are Organic Foods Better for the Environment? Comparison of Environmental Costs of Organic and Conventional Foods
Alkaya, Fatime; Günay, Esra; Turna, Hilal
Biodiversity loss, soil and water pollution as well as global warming are among the most debated environmental issues worldwide. Conventional farming, which uses chemical pesticides and fertilizers, hormones and genetically modified products to obtain maximum yield per unit of land to feed the rapidly growing world population, is one of the main causes of these problems. As an alternative production system to conventional farming, organic farming has emerged to overcome environmental problems. The effectiveness of organic farming in addressing environmental issues has been debated for many years. In this chapter, the impact of organic foods on the environment is evaluated under the headings of biodiversity, soil and water quality, energy efficiency and climate change. The consensus drawn from studies is that organic farming is a more environmentally friendly production method compared to conventional farming. However, the heterogeneity of studies and environmental factors are influenced by many factors, making it difficult to reach a consensus.
- MakaleAçık Erişim2024Scopus SJRQ1Evaluation of lavender essential oils and by-products using microwave hydrodistillation and conventional hydrodistillation
Kırkıncı, Seran; Gercek, Yusuf Can; Baştürk, Fatma Nur; Yıldırım, Nazlıcan; Gıdık, Betül; Bayram, Nesrin Ecem
This study investigated the impact of two extraction methods, traditional hydrodistillation (TDH) and microwave-assisted hydrodistillation (MAH), on the essential oil yield and chemical profile of Lavandula angustifolia L., as well as the bioactive potential of the resulting wastewater. Essential oil composition was analyzed via GC–MS, revealing similar qualitative and quantitative profiles for both methods, with α-terpinolene and (–)borneol as major constituents. Wastewater analysis via LC–MS/MS and spectrophotometric assays demonstrated the presence of significant total phenolic content (3.29–1.78 mg GAE/g) and 32 individual phenolics (463.1 µg/kg for TDH; 479.33 µg/kg for MAH). These findings suggest that both essential oil and wastewater obtained by either method possess considerable bioactive potential, with the MAH method potentially offering advantages over TDH for essential oil extraction. Further exploration of wastewater applications in various industrial sectors is warranted.
AtıfScopus25WoS22OpenAlex22İncele - MakaleAçık Erişim2024Scopus SJRQ3Change in Wood Color Due To The Use of Waste Vegetable Oils
Ayata, Ümit
An investigation was carried out without the use of thermal treatment to determine whether waste oils have color-altering effects on wood material surfaces. Waste vegetable oils (walnut, sunflower, corn, and olive) were applied to the surfaces of wood materials from ayous (Triplochiton scleroxylon K. Schum), fukadi (Terminalia amazonia), guatambú (Balfourodendron riedelianum (Engl.) Engl.), mahogany (Swietenia mahagoni (L.) Jacq.), and rengas (Gluta renghas L.) tree species. Subsequently, a control group was established, and experimental samples were compared. Changes in color parameters (L*, ∆a*, C*, ∆L*, a*, ∆b*, ho, ∆H*, b*, ∆C*, and ∆E*) were investigated. The results of multivariate analysis of variance for color parameters (C*, ho, L*, a*, and b*) were found to be statistically significant. A decrease in ho and L* was observed for all wood types and waste oils. On the other hand, a* and b* values increased and C* values decreased in guatambú and ayous wood on application of all waste vegetable oils. However, in the case of mahogany and rengas wood, a* and b* values decreased while C* values increased.
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