New insights into the efficient charge transfer of the modified-TiO2/Ag3PO4 composite for enhanced photocatalytic destruction of algal cells under visible light
New insights into the efficient charge transfer of the modified-TiO2/Ag3PO4 composite for enhanced photocatalytic destruction of algal cells under visible light
复制标题
DOI：
10.1016/j.apcatb.2021.120868
复制
发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Li Zhou;Xu Zhang;Min Cai;Naxin Cui;Guifa Chen;G. Zou
中科院分区：
文献类型：
--
作者：
Li Zhou;Xu Zhang;Min Cai;Naxin Cui;Guifa Chen;G. Zou
采用煅烧沉淀法制备了Ag 3 PO 4/掺氮黑TiO 2（b-N-TiO 2）p-n异质结。b-N-TiO 2中氮的掺入和氧空位的产生使带隙变窄，使带位发生移动，促进了p-n异质结的形成，从而促进了b-N-TiO 2/Ag 3 PO 4复合材料中光生电子和空穴的分离。结果表明，b-N-TiO 2/Ag 3 PO 4光催化降解叶绿素a的活性比纯Ag 3 PO 4、b-N-TiO 2和P25/Ag 3 PO 4分别提高了2.73、7.72和6.04倍。此外，光催化过程中光生电子和空穴的传递途径是产生超氧阴离子自由基（·O2-）的主要途径。与纯Ag 3 PO 4和P25/Ag 3 PO 4相比，电荷转移提高了复合物b-N-TiO 2/Ag 3 PO 4的光催化稳定性。该研究为研究缺陷在光催化复合材料中形成异质结的作用提供了新的视角。
A novel p-n heterojunction between Ag3PO4and 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-TiO2narrowed 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 b-N-TiO2/Ag3PO4. The b-N-TiO2/Ag3PO4exhibited enhanced photocatalytic activity for chlorophyll-a degradation inMicrocystisaeruginosacells, which was 2.73, 7.72, and 6.04 times higher than that of the pure Ag3PO4, b-N-TiO2, 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 (•O2-) in photocatalytic processes. The charge transfer increased the photocatalytic stability of the composite b-N-TiO2/Ag3PO4compared with pure Ag3PO4and P25/Ag3PO4. This research provides a new perspective into the roles of defects to form heterojunctions in photocatalytic composites.