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Rational Design of Novel Ternary Sm2WO6/ZnO/GO Nanocomposites: An Affordable Photocatalyst for the Mitigation of Carcinogenic Organic Pollutants
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 5.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.colsurfa.2020.124721
Arunpandian M. , Selvakumar K. , Raja A. , Rajasekaran P. , Ramalingan C. , Nagarajan E.R. , Pandikumar A. , Arunachalam S.

Abstract In this scenario, a ternary type of novel Sm2WO6/ZnO incorporated on GO (SWZG) nanocomposites were synthesized by the ultrasonic-assisted hydrothermal route and confirmed by various characterization techniques. The diffraction peaks obtained from Powder-X-ray analysis reveals good crystalline nature of as preparedSWZG composite. Scanning Electron Microscopereveals the red algae like the hexagonal structure of SWZ composition an elongated form on the graphene oxide sheet. The Transmission electron spectroscopy reveals the confirmation of algae like structure of Sm2WO6 and ZnO in elongated form on the surface of the graphene oxide sheet. The elemental composition and the oxidation state of C, Zn, O, Sm and W were confirmed by X-ray Photoelectron Spectroscopy analysis. The charge separation efficiency of the photogenerated electron-hole pairs in SmW, SmWZ and SmWZG was confirmed by photoelectrochemical measurements. SWZG catalyst shows superior photocatalytic activity towards the degradation of Ciprofloxacin (CIP) and Methylene blue (MB) with the efficiency of 96.92 & 98.24 % within 90 and 25 min. In Reactive Oxidative Species study, photogenerated holes and superoxide radicals are the main reactive species in the CIP and MB degradation process. Besides, the stability and reusability of the catalysts were confirmed by the recycle test. In the CIP degradation pathway, the reaction intermediate (7-amino-1-cyclopropyl-6-fluoro-2-hydroxy-4-oxo-1,4-dihydro quinolone-3-carboxylic acid (m/z 278.07)) were elucidated by Gas Chromatography–Mass Spectroscopy analysis and a feasible degradation pathway was also proposed. Finally, the ternary SWZG composite would be a promising candidate for the degradation of organic pollutants.

中文翻译:

新型三元 Sm2WO6/ZnO/GO 纳米复合材料的合理设计:一种用于减轻致癌有机污染物的经济实惠的光催化剂

摘要 在这种情况下,通过超声辅助水热路线合成了一种三元类型的新型 Sm2WO6/ZnO 掺杂在 GO (SWZG) 纳米复合材料上,并通过各种表征技术进行了证实。从粉末 X 射线分析获得的衍射峰表明所制备的 SWZG 复合材料具有良好的结晶性质。扫描电子显微镜在氧化石墨烯片上显示了红藻,如 SWZ 组成的六边形结构,呈细长形式。透射电子能谱揭示了在氧化石墨烯片表面上以细长形式存在的 Sm2WO6 和 ZnO 的藻类结构的确认。C、Zn、O、Sm和W的元素组成和氧化态通过X射线光电子能谱分析确定。通过光电化学测量证实了 SmW、SmWZ 和 SmWZG 中光生电子-空穴对的电荷分离效率。SWZG 催化剂对环丙沙星 (CIP) 和亚甲蓝 (MB) 的降解表现出优异的光催化活性,在 90 和 25 分钟内的效率分别为 96.92 和 98.24 %。在反应性氧化物质研究中,光生空穴和超氧自由基是 CIP 和 MB 降解过程中的主要反应物质。此外,再循环试验证实了催化剂的稳定性和可重复使用性。在 CIP 降解途径中,反应中间体(7-氨基-1-环丙基-6-氟-2-羟基-4-氧代-1,4-二氢喹诺酮-3-羧酸(m/z 278. 07)) 通过气相色谱-质谱分析阐明,并提出了可行的降解途径。最后,三元 SWZG 复合材料将成为降解有机污染物的有希望的候选者。
更新日期:2020-07-01
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