摘要
采用水热法合成了CuS负载的花状Bi_(2)WO_(6)异质结光催化剂用以在可见光下降解罗丹明B(RhB)。通过SEM,XRD,XPS,UV-vis DRS,PL等方法对其形貌结构及光电性能进行了表征。CuS的负载扩大了Bi_(2)WO_(6)光响应范围,增加了比表面积,促进了光生电子空穴对的分离,进而有效增强了光催化性能。在可见光下,10%CuS/Bi_(2)WO_(6)对RhB的降解效率最高,120 min内可达到97%,其催化效率为Bi_(2)WO_(6)的3.43倍。此外,还通过自由基捕获实验及ESR检测证明了空穴和超氧自由基为可见光下降解RhB的主要活性物质并提出了具体的反应机理。
CuS loaded flower-like Bi_(2)WO_(6)heterojunction composite photocatalyst was synthesized by hydrothermal method for the degradation of Rhodamine B(RhB)in visible light.The morphology and photoelectric properties were characterized by SEM,XRD,XPS,UV-vis DRS and PL.The load of CuS enlarged the light response range of Bi_(2)WO_(6),increased the specific surface area of Bi_(2)WO_(6),promoted the separation of photogenerated electron hole pairs,and effectively enhanced the photocatalytic performance of Bi_(2)WO_(6).Under visible-light irradiation,10%CuS/Bi_(2)WO_(6) showed the best photocatalytic activity and the highest RhB degradation rate of 97%within 120 min,which was 3.43 times that of Bi_(2)WO_(6).In addition,the free radical capture experiment and ESR detection proved that hole and superoxide radical were the main active substances of CuS/Bi_(2)WO_(6) in the visible light degradation of RhB,and the reaction mechanism was proposed.
作者
沈汀
陈艳玲
季业彤
白雪
SHEN Ting;CHEN Yan-ling;JI Ye-tong;BAI Xue(College of Environment,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Nanjing 210098,China)
出处
《环境科技》
2022年第2期1-7,共7页
Environmental Science and Technology
基金
国家自然科学基金面上项目(21876044).
