In_(2)S_(3)/UiO-67异质结的构筑及可见光催化清除Cr(Ⅵ)和RhB

Construction of In_(2)S_(3)/UiO-67 heterojunction for photocatalytic removal of Cr(Ⅵ)and RhB

针对MOFs可见光响应性差及难以同步驱动光催化还原和氧化反应的问题,采用水热方法将原位生成的In_(2)S_(3)物种沉积到UiO-67(Zr-MOF)表面,制备了In_(2)S_(3)/UiO-67复合材料(IM-1、IM-3和IM-5),并通过PXRD、FT-IR和XPS表征确认了异质结的形成。500 W氙灯照射下,性能最突出的IM-3在60 min内对Cr(Ⅵ)的还原效率高达92.4%,还原速率分别是纯In_(2)S_(3)和Zr-MOF的2.3和20倍;在180 min内对RhB的降解效率为78%,降解速率是纯In_(2)S_(3)和Zr-MOF的1.75和2.3倍。此外,通过XPS表征阐明了光生载流子迁移方向,并结合自由基捕获实验揭示了光催化反应机制。

Regarding the poor visible light response and the difficulty in synchronously driving photocatalytic reduction and oxidation reactions of MOFs,In_(2)S_(3)/UiO-67 composites(IM-1,IM-3,and IM-5)were prepared by deposition of in situ generated In_(2)S_(3)species on the surface of UiO-67(Zr-MOF),and the formation of heterostructure was confirmed by PXRD,FT-IR and XPS characterization.Under the irradiation of 500 W xenon lamp,the reduction efficiency of IM-3 for Cr(Ⅵ)reached 92.4%within 60 min,providing the reduction rate of 2.3 and 20 times that of pure In_(2)S_(3)and Zr-MOF,respectively.The degradation efficiency for RhB was 78%within 180 min,with the degradation rate of 1.75 and 2.3 times of that of pure In_(2)S_(3)and Zr-MOF.Moreover,the migration direction of photogenerated carriers were elucidated by XPS,and the photocatalytic reaction mechanism was further revealed in combination with free radical trapping experiments.