光催化
异质结
材料科学
面(心理学)
半导体
聚苯胺
化学工程
可见光谱
电子转移
降级(电信)
载流子
光化学
催化作用
聚合物
光电子学
化学
复合材料
聚合
有机化学
五大性格特征
工程类
人格
社会心理学
电信
计算机科学
心理学
作者
Sha Chen,Danlian Huang,Guangming Zeng,Wenjing Xue,Lei Lei,Piao Xu,Rui Deng,Jing Li,Min Cheng
标识
DOI:10.1016/j.cej.2019.122840
摘要
Considering that the crystal facet is highly correlated with the photocatalytic performance of the semiconductor, a novel BiVO4/Ag3PO4/PANI photocatalyst combined with facet engineering and heterojunction is prepared by depositing Ag3PO4 on the highly active (0 4 0) facet of BiVO4 and then incorporating polymer polyaniline (PANI). The synergistic modification of Ag3PO4 and PANI realizes excellent photocatalytic performance, with the degradation efficiency of 85.92% and the maximum rate constant of 0.00894 L mg−1 min−1, which is 10.1, 5.6 and 1.6 times than that of BiVO4, BiVO4/PANI and BiVO4/Ag3PO4, respectively. This enhanced photocatalytic performance is attributed to the following: (i) selective exposure of highly active BiVO4 (0 4 0) facet greatly improves the spatial separation efficiency of charge carriers; (ii) the (0 4 0) facet with preferentially exposed low-coordinated oxygen atoms provides sufficient binding sites for Ag+ anchoring, resulting in strong interfacial coupling between BiVO4 and Ag3PO4, which facilitates charge separation and transfer; (iii) the CB-electrons of Ag3PO4 can be timely consumed by the VB-holes of BiVO4 by the built-in electric field, thus preventing photo-corrosion of Ag3PO4; (iv) PANI acting as hole-transfer material can rapidly migrate holes accumulated in the VB of Ag3PO4 to the catalyst surface by its HOMO orbital, thereby achieving efficient charge separation; (v) the introduction of PANI results in a significant increase in visible light absorption efficiency. This work provides a novel design based on facet engineering and heterojunction, which can also be employed to other semiconductors to improve photocatalytic performance.
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