Fabricating Fe3O4-schwertmannite as a Z-scheme photocatalyst with excellent photocatalysis-Fenton reaction and recyclability  

作　　者：Ting Li Jianru Liang Lixiang Zhou 

机构地区：[1]College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China

出　　处：《Journal of Environmental Sciences》2020年第12期186-195,共10页环境科学学报（英文版）

基　　金：supported by National Natural Science Foun-dation of China (Nos. 21637003 and 41977338)。

摘　　要：Here we reported an effective method to solve the rate-limiting steps, such as the reduction of Fe^(3+) to Fe^(2+) and an invalid decomposition of H2O2 in a conventional Fenton-like reaction. A magnetic heterogeneous photocatalyst, Fe3O4-schwertmannite(Fe3O4-sch) was successfully developed by adding Fe3O4 in the formation process of schwertmannite. Fe3O4-sch shows excellent electrons transfer ability and high utilization efficiency of H2O2(98.5%). The catalytic activity of Fe3O4-sch was studied through the degradation of phenol in the heterogeneous photo-Fenton process. Phenol degradation at a wide pH(3-9) was up to 98% within 6 min under visible light illumination with the Fe3O4-sch as heterogeneous Fenton catalyst, which was higher than that using pure schwertmannite or Fe3O4. The excellent photocatalytic performance of Fe3O4-sch is ascribed to the effective recycling between ≡Fe^(3+) and ≡Fe^(2+) by the photo-generated electron, and also profit from the formation of the "Z-Scheme" system. According to the relevant data, photocatalytic mechanism of Fe3O4-sch for degrading phenol was proposed. This study not only provides an efficient way of enhancing heterogeneous Fenton reaction, but also gives potential application for iron oxyhydroxysulfate mineral.

关 键 词：FE3O4 SCHWERTMANNITE Phenol degradation Photocatalytic activity Photocatalytic mechanism 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]