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New insights into the efficient charge transfer of the modified-TiO2/Ag3PO4 composite for enhanced photocatalytic destruction of algal cells under visible light

文献类型： 外文期刊

作者： Zhou, Li 1 ; Zhang, Xu 1 ; Cai, Min 1 ; Cui, Naxin 1 ; Chen, Guifa 1 ; Zou, Guoyan 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

2.Shanghai Engn Res Ctr Low Carbon Agr, Shanghai 201403, Peoples R China

关键词： b-N-TiO2; Ag3PO4; Defects; Heterojunction; Band structure; Algal cells

期刊名称：APPLIED CATALYSIS B-ENVIRONMENTAL （ 影响因子：24.319； 五年影响因子：20.744 ）

ISSN： 0926-3373

年卷期： 2022 年 302 卷

页码：

收录情况： SCI

摘要： A novel p-n heterojunction between Ag3PO4 and nitrogen-doped black TiO2 (b-N-TiO2) was successfully synthesized via the calcination and precipitation method. The incorporated nitrogen and produced oxygen vacancies in b-N-TiO2 narrowed the bandgap and shifted the band position of TiO2, which promoted p-n heterojunction formation and subsequently facilitated the separation of photogenerated electrons and holes in the composite bN-TiO2/Ag3PO4. The b-N-TiO2/Ag3PO4 exhibited enhanced photocatalytic activity for chlorophyll-a degradation in Microcystis aeruginosa cells, which was 2.73, 7.72, and 6.04 times higher than that of the pure Ag3PO4, b-NTiO2, and P25/Ag3PO4, respectively. Furthermore, the mechanism exploration indicated the transfer pathways of photo-produced electrons and holes to generate the dominant superoxide anion radicals (center dot O2-) in photocatalytic processes. The charge transfer increased the photocatalytic stability of the composite b-N-TiO2/Ag3PO4 compared with pure Ag3PO4 and P25/Ag3PO4. This research provides a new perspective into the roles of defects to form heterojunctions in photocatalytic composites.

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