Department of Chemistry, Environmental Science Program, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to Be University), Bhubaneswar, 751 030, Odisha, India.
Department of Physics, Faculty of Engineering and Technology (ITER), Siksha'O'Anusandhan (Deemed to Be University), Bhubaneswar, 751 030, Odisha, India.
J Environ Manage. 2021 Nov 1;297:113312. doi: 10.1016/j.jenvman.2021.113312. Epub 2021 Jul 30.
An attempt has been made for the treatment of cyanide contaminated wastewater using a S-TiO@rGO heterogeneous photocatalyst system immobilized on polyurethane foam (PUF) supporting materials. Further, to make the photocatalytic system more efficient and active under visible light, a highly efficient iron porphyrin derivative sensitizer viz. Fe-TCPP was synthesized and employed for cyanide degradation. To investigate the synthesized heterogeneous nano-composite S-TiO@rGO-FeTCPP photocatalytic system, advanced techniques such as XRD, XPS, FT-IR, PL spectra, UV-vis DRS, FESEM, and EDS were utilized. The photocatalytic performance of the nanocomposite was evaluated in a suspended system and results revealed that about 75% of cyanide degradation was obtained at 100 mg/L of initial cyanide within 2 h. Whereas, at the same condition, more than 91% of cyanide degradation as well as 88% toxicity removal occurred by the PUF immobilized S-TiO2@rGO-FeTCPP solid-state photocatalytic system. First-order kinetics was applied to investigate the degradation of cyanide by the photocatalytic nanocomposite. From the kinetic study, the estimated first-order rate constant (K) in a solid-state photocatalytic system of the nanocomposite was 1.7 times superior to that of the suspended system. Further, the rate of photocatalytic activity was nearly 10.8 times greater than that of pure TiO. This study demonstrated that the immobilized S-TiO2@rGO-FeTCPP photocatalytic system could be an efficient technique for degrading cyanide from industrial effluent.
采用固定在聚氨酯泡沫（PUF）支撑材料上的 S-TiO@rGO 非均相光催化剂系统尝试处理含氰废水。此外，为了使光催化系统在可见光下更有效和更活跃，合成了一种高效的铁卟啉衍生物敏化剂 Fe-TCPP，并将其用于氰化物降解。为了研究合成的非均相纳米复合材料 S-TiO@rGO-FeTCPP 光催化系统，利用了 XRD、XPS、FT-IR、PL 光谱、UV-vis DRS、FESEM 和 EDS 等先进技术。在悬浮体系中评价了纳米复合材料的光催化性能，结果表明，在 100mg/L 的初始氰化物浓度下，2h 内可获得约 75%的氰化物降解率。而在相同条件下，PUF 固定化 S-TiO2@rGO-FeTCPP 固态光催化体系可实现超过 91%的氰化物降解和 88%的毒性去除。采用一级动力学研究了光催化纳米复合材料对氰化物的降解。从动力学研究中，估算出纳米复合材料在固态光催化体系中的一级速率常数（K）比悬浮体系高 1.7 倍。此外，光催化活性的速率比纯 TiO 高近 10.8 倍。该研究表明，固定化 S-TiO2@rGO-FeTCPP 光催化系统可以成为一种从工业废水中降解氰化物的有效技术。
