Z型异质结BiO_(2-x)/ZnWO_(4)对水中抗生素的光催化研究  

Photocatalytic properties of Z-scheme heterojunction BiO_(2-x)/ZnWO_(4) on antibiotics in water

作　　者：黄宏森 郑欣钰 林振锋 郭永福[1,3] HUANG Hongsen;ZHENG Xinyu;LIN Zhenfeng;GUO Yongfu(Department of Municipal Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Suzhou Sujing Environmental Protection New Material Co.,Ltd.,Suzhou 215200,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou 215009,China)

机构地区：[1]苏州科技大学市政工程系,江苏苏州215009 [2]苏州苏净环保新材料有限公司,江苏苏州215200 [3]江苏省水处理材料技术与材料协同创新中心,江苏苏州215009

出　　处：《工业水处理》2024年第4期138-146,共9页Industrial Water Treatment

基　　金：张家港市科技局产学研预研资金项目(ZKCXY2113)。

摘　　要：将两种具有不同能带结构的半导体结合起来构建异质结,可以有效地拓宽材料的光响应范围,提高光催化性能。采用简单的两步水热法制备了BiO_(2-x)/ZnWO_(4)复合材料,利用XRD、SEM和UV-vis漫反射光谱等表征研究了BiO_(2-x)/ZnWO_(4)的结构、形貌和光学性能,并考察了其在可见光下对四环素的光催化降解性能和循环稳定性能。研究结果表明,BiO_(2-x)/ZnWO_(4)复合材料借助BiO_(2-x)和ZnWO_(4)的协同作用,光生载流子可得到有效分离,光吸收能力显著增强;可见光照射90 min后,复合材料对四环素的光降解效率为86.04%,光响应范围和光催化活性均优于单体BiO_(2-x)和ZnWO_(4),且该材料具有良好的稳定性。捕获实验和ESR证实,复合材料在光照下产生h^(+)、O_(2)^(·-)和·OH,其中空穴h+和O_(2)^(·-)是光催化过程中的主要活性物质,而·OH是次要活性物种,其作用大小依次是h+>O_(2)^(·-)>·OH;推断BiO_(2-x)/ZnWO_(4)复合材料的电子转移机制为Z型异质结。Heterojunction combining with two kinds of different band structures semiconductors was constructed,and its photocatalytic performance could be greatly improved with the wider optical response range.The BiO_(2-x)/ZnWO_(4) composite was prepared by a simple two-step hydrothermal method.The structure,morphology and op-tical properties of BiO_(2-x)/ZnWO_(4) were characterized by XRD,SEM and UV-vis diffuse reflectometry.The photocata-lytic performance and cyclic stability of BiO_(2-x)/ZnWO_(4) were studied by degrading tetracycline under visible light.The results showed that with the synergistic action between BiO_(2-x) and ZnWO_(4),the photo-generated carriers of BiO_(2-x)/ZnWO_(4) could be effectively separated and the light absorption capacity of BiO_(2-x)/ZnWO_(4)could be significantly enhanced.After 90 min of visible light illumination,the photodegradation efficiency of the composite towards tetracy-cline reached 86.04%,and the light response range and photocatalytic activity of the composite were better than the monomer BiO_(2-x) and ZnWO_(4).In addition,the composite displayed good light stability.The capture experiments and ESR showed that h^(+),O_(2)^(·-) and·OH were produced by the composites under light,in which h+and O_(2)^(·-) were the main ac-tive substances in the process of photocatalysis,and·OH was the minor active species,following the order of h+>O_(2)^(·-)>·OH.It was inferred that the electron transfer mechanism of BiO_(2-x)/ZnWO_(4) was Z-scheme heterojunction.

关 键 词：光催化 钨酸锌 抗生素 Z型异质结 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]