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Photocatalytically recovering hydrogen energy from wastewater treatment using MoS2 @TiO2 with sulfur/oxygen dual-defect
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2021-11-10 , DOI: 10.1016/j.apcatb.2021.120878
Yaoyao Wu 1 , Xiaotao Chen 1 , Jiachun Cao 2 , Yuqing Zhu 1 , Wenjing Yuan 1 , Zhuofeng Hu 1 , Zhimin Ao 2 , Gary W. Brudvig 3 , Fenghui Tian 4 , Jimmy C. Yu 5 , Chuanhao Li 1
Affiliation  

Photocatalysis is a promising technology for energy and environment applications. Herein, a dual-defect heterojunction system of TiO2 hierarchical microspheres with oxygen vacancies modified with ultrathin MoS2−x nanosheets (MoS2−x @TiO2-OV) is designed for simultaneously degrading pollutants and evolving hydrogen. MoS2−x @TiO2-OV exhibits a dramatically enhanced photocatalytic activity with a H2 evolution rate of 2985.16 μmol g−1h−1. In treating the simulated pharmaceutical wastewater, MoS2−x @TiO2-OV is capable of purifying various refractory contaminants, with the highest H2 evolution rate of 41.59 μmol g−1h−1 during enrofloxacin degradation. While treating the simulated coking wastewater, the catalyst achieves a H2 evolution rate of 102.72 μmol g−1h−1 and a mineralization rate of 50%. Computational studies suggest that the dual-defect is superior for the adsorption of H* and producing·OH (‘dual-defect boosted dual-function’). Also, the dual-defect sites significantly boosted the charge-carrier separation and transfer efficiencies. This work highlights the crucial role of defect engineering to develop the energy-recovering wastewater treatment approaches.



中文翻译:

具有硫氧双缺陷的二硫化钼@TiO2光催化回收废水处理中的氢能

光催化是一种有前景的能源和环境应用技术。在此,设计了一种由超薄 MoS 2-x纳米片(MoS 2-x @TiO 2 -OV)修饰的具有氧空位的 TiO 2分级微球的双缺陷异质结系统,用于同时降解污染物和释放氢气。MoS 2-x @TiO 2 -OV 表现出显着增强的光催化活性,H 2析出率为2985.16 μmol g -1 h -1。在处理模拟制药废水时,MoS 2−x @TiO 2-OV 能够净化各种难处理的污染物,在恩诺沙星降解过程中,H 2析出率最高,为 41.59 μmol g -1 h -1。在处理模拟焦化废水时,催化剂的H 2析出率为102.72 μmol g -1 h -1,矿化率为50%。计算研究表明,双缺陷在吸附 H* 和产生·OH(“双缺陷增强双功能”)方面更胜一筹。此外,双缺陷位点显着提高了电荷载流子分离和转移效率。这项工作突出了缺陷工程在开发能量回收废水处理方法中的关键作用。

更新日期:2021-11-16
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