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امیر حسین چشمه خاور

The visible-light activated In,S-TiO2@rGO nanocomposite was prepared using an innovative ultrasonic-assisted solvothermal method. The XRD patterns indicated the anatase structure for TiO2 co-doped with indium and sulfur elements. FT-IR and Raman spectra analysis confirmed the presence of rGO in nanocomposites. In addition, SEM and HRTEM images confirmed the presence of mono-dispersed TiO2 nanoparticles on rGO sheets. A considerable red shift in absorption edge of TiO2 was observed after co-doping with In and S. Co-doping of TiO2 with In and S elements and compositing with rGO significantly enhanced its visible-light photocatalytic activity which was strongly affected by the amount of In, S and rGO to TiO2 ratio in the nanocomposite. The complete degradation and 95.5% mineralization of 20 mg/L atrazine (ATZ) was attained in the photocatalytic oxidation (PCO) process within 20 min with In,S co-doped TiO2@rGO nanocomposite. The rate of ATZ degradation in the PCO process with In,S co-doped TiO2@rGO nanocomposite was 80 times of that with pure TiO2 as catalyst under visible-light irradiation. The enhanced photocatalytic activity of the In, S co-doped TiO2@rGO is related to the synergistic effect of dopants contributing to improved visible light absorption and decreased recombination rate of the charge carriers. The degradation studies using various scavengers showed that hydroxyl radical was the main active species contributed in the photocatalytic degradation of ATZ under the selected conditions. In addition, the rate of ATZ degradation and mineralization in the photocatalytic process with the TiO2@rGO nanocomposites as catalyst was 0.248 and 0.169 min−1, respectively, which was remarkably greater than TiO2. The prepared nanocomposite was found to be a reusable and durable catalyst for visible light photocatalytic degradation of ATZ. As-made In,S co-doped TiO2@rGO nanocompsite could preserve its catalytic activity during four consecutive recycles for the ATZ removal process. The cytotoxicity of fresh and photocatalytic-treated ATZ solutions assessed using the human hepatic cells (HepG2) indicated that treating ATZ solution in the developed PCO process could be considerably detoxified.

TiO2 doping, Graphene oxide, Nanocomposite, Photocatalytic process

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حسین چشمه خاور، امیر، 1402، Visible-light-induced In,S-TiO2@rGO with enhanced photocatalytic activity for detoxification of atrazine، بیست و دومین کنفرانس شیمی معدنی ایران، https://conference.uok.ac.ir/fa/archive_index.php?c=HN-iicc22&aid=1517880