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Facile synthesis of Bi2WO6/C3N4/Ti3C2 composite as Z-scheme photocatalyst for efficient ciprofloxacin degradation and H2 production
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-09-30 , DOI: 10.1016/j.apcata.2020.117869
Kun Wu , Shaojia Song , Huadong Wu , Jia Guo , Linfeng Zhang

In this study, a novel 2D/2D/2D Bi2WO6/C3N4/Ti3C2 composite photocatalyst is synthesized through a one-step hydrothermal method. The ternary photocatalyst exhibits remarkable CIP photodegradation activity with an apparent rate constant of 0.058 min−1 (4.78 times the rate of Bi2WO6), and the photocatalytic H2 production rate reaches 54.4 μmol/g/h. The H2 evolution with simultaneous CIP degradation can also be achieved via prepared ternary catalyst, with H2 production rate of 37.8 μmol/g/h. The well-matched band structure favors the formation of Z-scheme heterojunction, which is affirmed by the ESR and radicals scavenger testing results. The mechanism and driving force of suggested Z-scheme heterojunction is discussed based on the investigation of charge effective mass and surface electrostatic potential. Moreover, Ti3C2 co-catalysts can further facilitate charge transfer and improve redox abilities of binary Bi2WO6/C3N4 composites, leading to a faster active radicals generation rate. This work highlights the prospective role of Ti3C2 in construction of Z-scheme photocatalysts.



中文翻译:

毕的简便合成2 WO 6 / C 3 Ñ 4 / Ti的3 c ^ 2复合物作为Z-方案的光催化剂进行高效环丙沙星降解和H 2生产

本研究通过一步水热法合成了新型的2D / 2D / 2D Bi 2 WO 6 / C 3 N 4 / Ti 3 C 2复合光催化剂。该三元光催化剂表现出显着的CIP光降解活性,表观速率常数为0.058min -1(Bi 2 WO 6的速率的4.78倍),光催化H 2的产生速率达到54.4μmol/ g / h。H 2的分解同时发生CIP降解也可以通过使用H 2制备的三元催化剂来实现生产速度为37.8μmol/ g / h。良好匹配的能带结构有利于Z型异质结的形成,这由ESR和自由基清除剂测试结果所证实。基于电荷有效质量和表面静电势的研究,讨论了建议的Z型异质结的机理和驱动力。此外,Ti 3 C 2助催化剂可进一步促进电荷转移并提高二元Bi 2 WO 6 / C 3 N 4复合材料的氧化还原能力,从而导致更快的活性自由基产生速率。这项工作突出了Ti 3 C 2在Z方案光催化剂的构建中的预期作用。

更新日期:2020-10-11
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