Highly efficient Bi2O2CO3/BiOCl photocatalyst based on heterojunction with enhanced dye-sensitization under visible light
Highly efficient Bi2O2CO3/BiOCl photocatalyst based on heterojunction with enhanced dye-sensitization under visible light
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DOI：
10.1016/j.apcatb.2016.01.045
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发表时间：
2016-06
影响因子：
22.1
通讯作者：
Linhui Yu;Xiaoyun Zhang;Guowei Li;Yuantao Cao;Yu Shao;Danzhen Li
中科院分区：
文献类型：
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作者：
Linhui Yu;Xiaoyun Zhang;Guowei Li;Yuantao Cao;Yu Shao;Danzhen Li
采用一种简便的方法合成了高效的Bi 2 O2 CO 3/BiOCl光催化剂。结果表明，Bi 2 O2 CO 3/BiOCl复合材料在可见光下对罗丹明B（RhB）具有良好的光催化活性，其光催化活性甚至优于P25（商品TiO 2）在紫外光下的光催化活性。通过使用不同类型的活性物种清除剂和电子自旋共振（ESR）的测量来评估活性物种在降解过程中的作用。结合紫外-可见漫反射光谱测量的平坦势（Vfb）和带隙能（Eg），确定了Bi 2 O2 CO 3和BiOCl的相对能带结构。结果表明，在可见光（420 nm < λ < 800 nm）下，两种半导体的复合有利于RhB的光敏降解。并揭示了RhB光敏化的本质是反应体系中H_2O_2的增加。进一步提出了光催化机理，阐明了光催化过程中的电荷转移和活性物种的形成。本工作为新型Bi 2 O2 CO 3基异质结构光催化剂的应用奠定了基础。
A facile approach is developed to synthesis the highly efficient photocatalyst of Bi2O2CO3/BiOCl. The composite of Bi2O2CO3/BiOCl exhibits excellent photocatalytic activity toward Rhodamine B (RhB) under visible light, which is even better than that of P25 (commercial TiO2) under UV light. The role of the active species in the process of the degradation is evaluated by using different types of active species scavengers and measurement of electron spin resonance (ESR). The relative band structures of the Bi2O2CO3and BiOCl are determined combined with the flat potential (Vfb) and bandgap energy (Eg) evaluated by UV–vis diffuse reflectance spectra. The results show that the composite of the two semiconductors facilitates the photosensitized degradation of RhB under visible light (420 nm < λ < 800 nm). And the essence of RhB photosensitization is revealed to be the increase of H2O2in the reaction system. The photocatalytic mechanism is further proposed, which unfolds the charge transfer and the active species formed in the photcatalytic process. The work may set foundation for application of the new photocatalyst of Bi2O2CO3-based heterostructure.