Photocatalytically recovering hydrogen energy from wastewater treatment using MoS2 @TiO2 with sulfur/oxygen dual-defect

Wu, Yaoyao ¹Chen, Xiaotao ¹Cao, Jiachun ²Zhu, Yuqing ¹Yuan, Wenjing ¹Hu, Zhuofeng ¹Ao, Zhimin ²Brudvig, Gary W. ³Tian, Fenghui ⁴Yu, Jimmy C. ⁵Li, Chuanhao¹

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作者信息

1. Sun Yat Sen Univ
2. Guangdong Univ Technol
3. Yale Univ
4. Qingdao Univ
5. Chinese Univ Hong Kong
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Abstract

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 mu mol 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 mu mol g- 1h- 1 during enrofloxacin degradation. While treating the simulated coking wastewater, the catalyst achieves a H2 evolution rate of 102.72 mu mol 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.

Key words

Dual-functional photocatalysis/Dual defects/Oxygen vacancy/Resource-recovering wastewater treatment/ACTIVE EDGE SITES/ULTRATHIN NANOSHEETS/ORGANIC POLLUTANTS/VACANCY DEFECT/OXIDATION/EVOLUTION/TIO2/DEGRADATION/GENERATION/SURFACE

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量56

参考文献量61

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