Bi_(2)S_(3)/NiS复合催化剂光催化还原Cr(VI)的研究  

Study on photocatalytic reduction of Cr(VI)using Bi_(2)S_(3)/NiS composite catalyst

作　　者：陈全亮 胡幸枝 陈华林 CHEN Quan-liang;HU Xing-zhi;CHEN Hua-lin(Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China)

机构地区：[1]西南民族大学化学与环境学院,青藏高原污染控制化学与环境功能材料国家民委重点实验室,四川成都610041

出　　处：《西南民族大学学报（自然科学版）》2024年第4期390-398,共9页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：四川省自然科学基金面上项目(2022NSFSC0796);西南民族大学中央高校基本科研业务费(ZYN2024019)。

摘　　要：通过水热法制备了一种新型Bi_(2)S_(3)/NiS复合光催化剂,采用FT-IR、XRD、SEM、固体荧光和固体紫外等光谱对催化剂的组成、结构、形貌和光学性质进行了表征.Bi_(2)S_(3)/NiS复合催化剂在可见光照射下能有效将溶液中的Cr(VI)光催化还原为Cr(III).在最优条件下,复合催化剂的反应速率常数约为Bi_(2)S_(3)或NiS的反应速率常数的10倍.复合催化剂光催化还原Cr(VI)效率的提高主要是因为Bi_(2)S_(3)和NiS的复合降低了禁带宽度,扩大了光吸收范围,并且复合后有效降低了光生载流子的复合效率.催化剂循环实验表明Bi_(2)S_(3)/NiS复合催化剂具有良好的光学稳定性.研究结果为光催化处理含Cr(VI)废水的材料合成和设计研究提供了参考.Novel Bi_(2)S_(3)/NiS composite photocatalysts were prepared by hydrothermal method.The composition,structure,mor-phology,and optical properties of the catalysts were characterized in detail using FT-IR,XRD,SEM,solid-state fluorescence,and solid-state ultraviolet spectroscopy.The Bi_(2)S_(3)/NiS composite catalysts could effectively photocatalytic reduce Cr(VI)to Cr(III)under visible light irradiation.Under optimal conditions,the reaction rate constant of the composite catalyst was about 10 times that of Bi_(2)S_(3)or NiS.The efficiency improvement of photocatalytic reduction of Cr(VI)by composite catalysts was mainly due to the composition of Bi_(2)S_(3)and NiS,which reduced the bandgap,improved the light absorption range,and effectively reduced the recombination efficiency of photo-generated carriers.The cyclic experiment showed that the Bi_(2)S_(3)/NiS composite catalyst had good optical stability.The research results provided a reference for the material synthesis and design research of photocatalytic treatment of Cr(VI)containing wastewater.

关 键 词：硫化铋 复合催化剂 光催化还原 铬废水处理 六价铬 

分 类 号：O643.36[理学—物理化学] O644.14[理学—化学] X703[环境科学与工程—环境工程]