Yan Qishe, Xie Xin, Liu Yonggang, Wang Shenbo, Zhang Menghan, Chen Yongyang, Si Yushan
Institute of Chemistry and Molecular Engineering, Zhengzhou University, No.100 Science Avenue, High-Tech Zone, Zhengzhou, Henan, 450001, China.
J Hazard Mater. 2019 Jun 5;371:304-315. doi: 10.1016/j.jhazmat.2019.03.031. Epub 2019 Mar 7.
The series Ag-AgI/BiOI-BiO visible-light-driven photocataslyts were successfully synthesized by solvothermal method. The as-synthesized samples were systematically characterized by XRD, SEM, TEM, EDS, BET, XPS, FR-IR, UV-vis DRS, photoelectrochemical measurements and EPR. The formation mechanism of the new composite photocataslyts was investigated and the simulate formation process had been illustrated. The photocatalytic properties of the samples were evaluated by degradation of methyl orange under visible-light irradiation. The results shown that the 30% Ag-AgI/BiOI-BiO photocataslyts possessed the best photocatalytic activity and the kinetics reaction models were followed pseudo-first-order kinetics. The enhanced photocatalytic performance could be attributed to the effective separation and transfer of electron-hole pairs resulting by the deposing of Ag-AgI nanoparticles and BiO. The photocatalytic mechanism was deduced by trapping experiments and EPR, and the results demonstrated that h, OH, O radicals played different roles in the degradation. Furthermore, a new Z-scheme multi-heterojunction mechanism was proposed basing on the results of trapping experiments and EPR.
通过溶剂热法成功合成了系列Ag-AgI/BiOI-BiO可见光驱动光催化剂。采用XRD、SEM、TEM、EDS、BET、XPS、FT-IR、UV-vis DRS、光电化学测量和EPR对所合成的样品进行了系统表征。研究了新型复合光催化剂的形成机理，并阐述了模拟形成过程。通过在可见光照射下降解甲基橙来评价样品的光催化性能。结果表明，30%Ag-AgI/BiOI-BiO光催化剂具有最佳的光催化活性，动力学反应模型遵循准一级动力学。光催化性能的提高可归因于Ag-AgI纳米颗粒和BiO沉积导致的电子-空穴对的有效分离和转移。通过捕获实验和EPR推导了光催化机理，结果表明h、OH、O自由基在降解过程中发挥了不同作用。此外，基于捕获实验和EPR的结果提出了一种新的Z型多异质结机理。
