CdIn_(2)S_(4)/In_(2)O_(3)/BP复合可见光催化剂降解RhB及光催化灭活大肠杆菌

RhB photodegradation and E.coli photocatalytic sterilization by CdIn_(2)S_(4)/In_(2)O_(3)/BP composite visible photocatalysts

采用水热法制备了CdIn_(2)S_(4)和In_(2)O_(3)单品催化剂以及Cdln_(2)S_(4)/In_(2)O_(3)/黑磷(BP)三元复合光催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-vis DRS)、X射线光电子能谱(XPS)等对制备的催化剂进行表征分析。以罗丹明B(RhB)为目标降解物进行了降解实验,以大肠杆菌(E.coli)为目标进行了灭菌实验,分析了不同掺杂比例的Cdln_(2)S_(4)/对所制备材料光催化性能的影响。从自由基捕获实验中分析出降解过程中起主要作用的活性物质。结果表明:CdIn_(2)S_(4)、In_(2)O_(3)、BP三者成功复合,复合的三元材料可提高In_(2)O_(3)对可见光的吸收,使其光催化活性得以增强;Cdln_(2)S_(4)/In_(2)O_(3)/BP对RhB的降解率和E.coli的灭菌率均优于单品催化剂,且5%Cdln_(2)S_(4)/In_(2)O_(3)/BP的光催化性能最好,光照120 min后,对RhB的降解率和对E.coli的灭菌率分别达到了94.7%和100%;在降解和灭菌过程中,·O_(2)^(−)起主导作用。

CdIn_(2)S_(4),In_(2)O_(3) and CdIn_(2)S_(4)/In_(2)O_(3)/BP ternary composite photocatalysts were prepared by hydrothermal method.The prepared catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier infrared spectroscopy(FT-IR),UV-vis diffuse reflectance spectroscopy(UV-vis DRS)and X-ray photoelectron spectroscopy(XPS).Rodamine B(RhB)and Escherichia coli(E.coli)were chosen as the target pollutants in photodegradation and sterilization experiments,respectively.The effects of different doping ratios of Cdln_(2)S_(4)/ on the photocatalytic performance of the prepared materials were investigated.The active substances that played a major role in the degradation process were analyzed in free radical capture experiments.The results showed that CdIn_(2)S_(4)/In_(2)O_(3)/BP photocatalysts were successfully prepared.The composite ternary material improved the absorption of visible light by In_(2)O_(3) and enhanced its photocatalytic activity.Compared to CdIn_(2)S_(4) and In_(2)O_(3),the enhanced degradation rate of RhB and the sterilization rate of E.coli occurred for CdIn_(2)S_(4)/In_(2)O_(3)/BP,and the best photocatalytic performance was 5%Cdln_(2)S_(4)/In_(2)O_(3)/BP.After 120 min illumination,the degradation rate of RhB and the sterilization rate of E.coli reached 94.7%and 100%,respectively.·O_(2)^(−)played a leading role in the degradation and sterilization process.