采用水热法合成了BiFeO3,使用光还原技术将AgCl沉积在BiFeO3表面,制备了具有可见光催化活性的 AgCl/BiFeO3复合光催化剂,并利用 XRD、SEM 和 UV -Vis DRS 等分析了 AgCl/BiFeO3异质结的物相、表面结构和光响应性等性能.结果表明,AgCl的沉积不仅改善了BiFeO3的表面结构,有效促进光生电子的迁移;而且扩宽了BiFeO3的光响应范围,提高了BiFeO3的可见光响应能力.以光催化降解模拟染料废水的效果评价其可见光催化性能.结果表明,Ag与Bi物质的量比为1:2时,AgCl/BiFeO3复合光催化剂对亚甲基蓝的降解效果最佳,光照210 min,降解率可达92.5%.AgCl/BiFeO3复合光催化剂具有良好的光催化稳定性,循环使用5次后,降解率仍能达到80%以上.%BiFeO3was prepared by hydrothermal method,and then,AgCl/BiFeO3composites with visible light photocatalytic activity was synthesized by photoreduction deposition of AgCl onto BiFeO3.The phase, surface structure and light response was characterized by the XRD,SEM,and DRS UV-Vis.Due to the deposition of AgCl,surface structure of BiFeO3was improved,and the recombination of photogenerated electron/hole pair was effectively suppressed.Furthermore,the structure broadened the response range of visible light.The photocatalytic performance was investigated by degradation of simulated dye wastewater.The results showed that the degradation conversion to methylene blue on AgCl/BiFeO3with Ag:Bi =1:2 was 92.5% in 210 min,higher than that of AgCl and BiFeO3.AgCl/BiFeO3had good pho-tocatalytic stability,and the degradation rate could reach more than 80% after recycling 5 times.
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