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Constructed 3D hierarchical micro-flowers CoWO4@Bi2WO6 Z-scheme heterojunction catalyzer: Two-channel photocatalytic H2O2 production and antibiotics degradation
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-11-06 , DOI: 10.1016/j.cej.2020.127639
Jing Wang , Lijun Yang , Lei Zhang

Proper design and fabrication of multifunctional visible-light-induced photocatalysts with high catalytic efficiency is still a huge challenge for the value-added chemicals production and environmental remediation. A novel 3D flower-like hierarchical CoWO4@Bi2WO6 Z-scheme hybrid was successfully fabricated via anchoring CoWO4 nanoparticls on the 2D nanopetals of Bi2WO6 microflower obtained by solvothermal assistant self-assembly. The multifunctional composite could markedly improve photocatalytic H2O2 production via two-channel route (oxygen reduction and water oxidation reaction) without using sacrificial agent. Interestingly, 3D CoWO4@Bi2WO6 also displayed a remarkable degradation performance on single (enrofloxacin (ENR), lomefloxacin (LOM) or ciprofloxacin hydrochloride (CIP)) and ternary mixed antibiotics (ENR+LOM+CIP) under visible light irradiation. The outstanding photocatalytic activity was primarily attributed to the 3D hierarchical CoWO4@Bi2WO6 micro-flowers architecture for boosting visible light harvesting, matching energy band gaps, more exposed active sites, formation of Z-scheme based charge-transfer dynamics in a p-n heterostructure, as well as strong oxidation and reduction capability of photoexcited h+ and e-. Therefore, it was believed that the novel multifunctional CoWO4@Bi2WO6 photocatalyst exhibited a potential application in production of H2O2 and degradation of organic contaminants, which were more significant for the following purification in industrial production and environmental governance.



中文翻译:

构造的3D分层微花CoWO 4 @Bi 2 WO 6 Z方案异质结催化剂:两通道光催化H 2 O 2的产生和抗生素的降解

正确设计和制造具有高催化效率的多功能可见光诱导光催化剂,对于增值化学品生产和环境修复仍然是巨大的挑战。通过将CoWO 4纳米颗粒锚固在通过溶剂热辅助自组装获得的Bi 2 WO 6微花的2D纳米花瓣上,成功制备了新颖的3D花状分层CoWO 4 @Bi 2 WO 6 Z-方案杂化体。多功能复合材料可以显着改善光催化H 2 O 2通过两通道途径生产(氧气还原和水氧化反应),而无需使用牺牲剂。有趣的是,在可见光照射下,3D CoWO 4 @Bi 2 WO 6在单个(恩诺沙星(ENR),洛美沙星(LOM)或环丙沙星盐酸盐(CIP))和三元混合抗生素(ENR + LOM + CIP)上也表现出显着的降解性能。 。杰出的光催化活性主要归因于3D分层CoWO 4 @Bi 2 WO 6微花结构用于提升可见光收获,匹配的能带隙,更暴露的活性位点,形成基于Z-方案电荷转移动力学中的pn异质结构,以及强氧化和光激发的H的还原能力+和e -。因此,据信新型的多功能CoWO 4 @Bi 2 WO 6光催化剂在H 2 O 2的生产和有机污染物的降解中显示出潜在的应用,这对于随后的工业生产纯化和环境治理具有更大的意义。

更新日期:2020-11-06
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