Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Ammas, G.(1)
- Bardakci, S.(1)
- Barutçuoğlu, Burak(1)
- Bulut, Ayhan(1)
- Kara, Adem(1)
- Kutsal, U.(1)
- Kutsal, Ümit(1)
- Sarper, G.(1)
- Sağnak, Y.(1)
- Sağnak, Yiğit(1)
- Temur, Hakan(1)
- Toker, Abidin(1)
- Ugurlu, Nuray(1)
- Yilmaz, Bahadir(1)
- Çatar, Recep(1)
- Çolak, M.(1)
- Çolak, Murat(1)
Yayınlar
- MakaleAçık Erişim2026Scopus SJRQ2Investigation of the Effects of Low-Temperature Thermal Treatment Applied to Graphite in Spent Lithium-Ion Anode Recycling
Kara, Adem; Temur, Hakan
As the use of lithium-ion batteries (LIB) increases rapidly, recovery of graphite, the main component of the anode, from spent batteries has become important from environmental and economic perspectives. In this study, an acid leaching step followed by thermal treatment under partial atmosphere at a relatively low calcination temperature was investigated to recover graphite from spent lithium-ion batteries. The molecular and chemical structures of the recovered graphite in all spent anode samples were investigated using FTIR, ICP-MS, XRD, SEM–EDX and TEM–EDX. It was observed that organic impurities and volatile components were largely removed after acid leaching and thermal treatment at 750 °C. In addition, it was observed that graphite layers were rearranged and the distance between the layers decreased under the effect of thermal treatment. Partial atmosphere calcination at 750 °C can be considered as a feasible method for graphite recovery, offering energy efficiency and scalability. However, in an efficient calcination, it is necessary to maintain controlled oxygen levels to prevent excessive graphite loss and to perform preliminary acid leaching to reduce metal impurities. In order to best recycle graphite in waste lithium-ion anode recovery, a balance must be achieved between temperature, energy efficiency and material recovery. Considering this balance, a calcination temperature of 750 °C appears to be preferable for recycling.
AtıfScopus2WoS2
İncele - MakaleAçık Erişim2026Scopus SJRQ3Optimization of Rotary Degassing Parameters to Improve Melt Cleanliness and Mechanical Properties in A356 Aluminum Alloy
Kutsal, U.; Çolak, M.; Sağnak, Y.; Bardakci, S.; Ammas, G.; Sarper, G.
Melt cleanliness is a critical factor that directly affects the quality of aluminum castings and becomes even more significant in recycling-oriented production, where high scrap utilization is inevitable. Increasing the proportion of scrap intensifies the risk of oxide films, inclusions, and gas porosity in the molten metal; therefore, efficient refining techniques are essential. In this study, the effects of rotary degassing parameters—including rotor speed, rotation time, and gas flow rate—on melt cleanliness of A356 aluminum alloy were systematically investigated. Experimental melts containing 20% primary and 80% scrap aluminum were treated under various degassing conditions using a commercial flux cleaning flux. Characterization was performed through the Reduced Pressure Test (RPT), bifilm index analysis, fluidity measurements, microstructural examinations, and mechanical testing (tensile test and Brinell hardness measurement). The results demonstrated that increasing the rotor speed from 200 rpm to 500 rpm significantly reduced both the density and bifilm indices, indicating a notable improvement in melt cleanliness. Furthermore, higher gas flow rate (10 L/min) and longer rotation time (10 min) provided additional but secondary improvements. Consequently, the optimization of rotary degassing parameters enhanced not only melt quality but also tensile strength and ductility. These findings offer practical insights for optimizing process control in recycling-based aluminum foundries.
- MakaleYalnız künye2026Scopus SJRQ2Effect of Scandium Addition on Recycled A356 Alloy: Experimental Investigation and CALPHAD-Based Thermodynamic Analysis
Kutsal, Ümit; Barutçuoğlu, Burak; Sağnak, Yiğit; Toker, Abidin; Çatar, Recep; Çolak, Murat
This study systematically investigates the influence of scandium (Sc) additions at 0.1, 0.2, and 0.3 wt.% on the melt quality, microstructural characteristics, fluidity, and mechanical performance of A356 aluminum alloy under recycling-oriented casting conditions. The alloy charge consisted of 20% primary aluminum and 80% recycled scrap, while the Fe content was maintained at 0.2 wt.%. Melt treatment was performed by rotary degassing using a commercial flux. Melt quality was assessed using the Reduced Pressure Test (RPT) and bifilm index analysis, whereas casting performance was evaluated through an eight-channel fluidity test. Mechanical behavior was characterized by tensile and Brinell hardness testing, and microstructural and phase analyses were conducted using scanning electron microscopy (SEM) and X-ray diffraction (XRD). To complement the experimental investigation and provide a thermodynamic basis for interpretation, phase stability, solidification behavior, and phase-fraction evolution were examined using Thermo-Calc within the CALPHAD framework. By combining experimental characterization with computational thermodynamic analysis, this study elucidates the effect of Sc content on the processing–microstructure–property relationships of recycled A356 alloys and provides a systematic basis for evaluating Sc modification in high-recycled-content aluminum castings.
- MakaleAçık Erişim2023Scopus SJRQ1The effect of waste material generated during paper production on the rheological and structural features of asphalt binder
Yilmaz, Bahadir; Ugurlu, Nuray
In this study, the performance properties of magnesium lignosulfonate, an organic waste material produced during paper production from wood, on asphalt binder were investigated. The modification was carried out by adding magnesium lignosulfonate (MLS) at 2%, 4%, 6%, and 8% by weight to the asphalt with B50/70 penetration grade. The morphological structure, modification mechanism, and thermal decomposition temperatures of the modified asphalt binders formed by adding the MLS to the asphalt were determined by a Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Thermogravimetry-Differential Thermal Analysis (TG/DTG), respectively. The physical and rheological properties of the material were determined by penetration, softening point, Rolling Thin Film Oven Test (RTFOT), Dynamic Shear Rheometer (DSR), and Rotational Viscometer (RV) experiments conducted in a laboratory. The experimental results showed that the organic-based waste additive increases the asphalt consistency, rutting, and short-term aging resistance, and decreases the temperature sensitivity.
AtıfScopus6WoS7OpenAlex7İncele - MakaleAçık Erişim2020Scopus SJRQ3Teacher opinions about children's awareness of zero-waste and recycling in the pre-school education years
Bulut, Ayhan
The aim of this study is to encourage the development of pre-school teachers by raising their awareness about zero-waste and recycling activities. The need for this research is linked to the lack of prominence about the concept of zero-waste in pre-school programs in Turkey, and also the limited inclusion of opportunities for pre-school students to learn about recycling strategies. This research uses a qualitative design and adopts a case-study approach. The study group was purposefully sampled using criterion-sampling. Interviews were conducted with forty pre-school education teachers who volunteered to support the research, had at least five years experience, and had received training about zero-waste and recycling activities. The interviews with pre-school education teachers were conducted once and took approximately fifty minutes. Content analysis and descriptive analysis approaches were employed. The research findings were based on each interview question, and tables were created under five headings. Research findings indicate that most of the pre-school education teachers stated the children's awareness about zero-waste and recycling was insufficient during the pre-school education years. Teachers have stated that awareness about zero-waste and recycling can be enriched through the inclusion of specific content and the use of visual materials in pre-school education programs. Additionally, pre-school education teachers emphasized that using an educational game will make the learning process about zero-waste and recycling strategies more enjoyable and will also be the most suitable method in terms of the children's age and levels of development. On the other hand, teachers have stated that in order to raise children's awareness about zero-waste and recycling, there should be further studies conducted about how such awareness will contribute to the social and emotional development of children as well as studies about how children can learn-by-doing.
AtıfScopus17OpenAlex19İncele