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  • Küçük Resim
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    Improved characteristics for chemically grown Cu2SnS3 promising solar absorbers through the use of TritonX-100 (R) surfactant
    (Elsevier, 2015) Yaşar, S.; Kahraman, S.; Çetinkaya, S.; Bilican, I.
    In this paper, we report, for the first time, the results of the TritonX-100 (R) surfactant assisted growth of Cu2SnS3 thin films obtained by using sol-gel spin coating method and a subsequent annealing in a sulfur atmosphere. Structural, morphological, compositional, photo-electrical investigations have been carried out. X-ray diffraction patterns of the samples matched well with the reference Cu2SnS3 pattern and indicated the polycrystalline nature of the films. Crystallite size of the films increased whereas surface roughness of the films decreased with increasing Triton-X100 (R) content. The surface of the samples has been smoother with Triton-X100 (R) inclusion. The photo-sensitivity of the n-Si/CTS structures has been confirmed through photo-transient current measurements. An increment was observed in the photoinduced current values of the samples with increasing Triton-X100 (R) content and was attributed to transport of photo-induced electrons facilitated with decreasing recombination resulted from the surface enhancement of the films. Electrical conduction mechanism of the films was investigated with resistance-temperature measurements. It has been revealed that TritonX-100 (R) surfactant assisted growth is a promising way to improve conversion efficiency of Cu2SnS3 based solar cells. (C) 2014 Elsevier B.V. All rights reserved.
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    Utilization of peanut shell: investigating the adsorption mechanism and optimization of red 195 and reactive black-5
    (Springer Nature, 2024) Çelebi, H.; Bahadır, T.; Tulun, Ş.; Şimşek, İ.; Bilican, I.
    In this study, peanut shells (PS) called waste were utilized in powdered form for the removal of Red 195 (R-195) and Reactive Black-5 (RB-5) from synthetic wastewater solutions. Various operational parameters such as PS dosage (0.1–5.0 g), pH (2–12), contact time (5–150 min.), and temperature (20–40 °C) were investigated to optimize the batch adsorption process. FTIR, TGA, pHZPC, and SEM analyses were conducted to investigate the structural features and surface chemistry of PS. FTIR analyses revealed the existence of specific functional groups on the PS surface capable of successfully adsorbing R-195 and RB-5. TGA results demonstrated thermal stability for all prepared samples. SEM highlighted the porous structure of PS, which is advantageous for dye adsorption. The process, characterized by physical adsorption predominance and single-layer adsorption, was well-fitted to Langmuir and PFO for both dyes. Maximum removal efficiencies of 95.30% for RB-5 at pH 2.0 and 94.00% for R-195 at pH 2.5 were determined. Thermodynamic factors suggested that the adsorption of R-195 and RB-5 onto PS occurred spontaneously and exhibited an endothermic nature. Due to the interaction with a higher number of functional groups, PS exhibited a higher maximum adsorption capacity for R-195 (27.027 mg/g) compared to RB-5 (10.989 mg/g). The results support the idea that PS can act as an efficient and eco-friendly adsorbent, capable of removing both R-195 and RB-5.