Ag/AgCl/ZnAl-LDH催化剂可见光降解甲基橙  

Degradation of Methyl Orange under Visible-Light on Ag/AgCl/ZnAl-LDH

作　　者：阎美新 索红月 申延明 刘东斌 樊丽辉 YAN Meixin;SUO Hongyue;SHEN Yanming;LIU Dongbin;FAN Lihui(Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2024年第2期127-134,共8页Journal of Shenyang University of Chemical Technology

摘　　要：采用Ag/AgCl复合ZnAl-LDH制备Ag/AgCl/ZnAl-LDH可见光催化剂,利用XRD、SEM、TEM、BET和UV-Vis对制备的样品进行表征.结果表明:制备的ZnAl-LDH具有典型的水滑石结构,而AgCl覆盖在ZnAl-LDH的表面.活性测试结果表明:在AgCl负载量(质量分数)为25%,甲基橙质量浓度为25 mg/L,催化剂添加量为1 g/L的条件下,可见光光照180 min后,甲基橙的降解率达到95.2%.光催化机理推断为光照下AgCl表面形成的Ag簇吸收可见光,产生电子-空穴,AgCl作为光生电子和空穴分离的载体将其分别转化为·O_(2)^(-)和Cl·,进而氧化甲基橙,而ZnAl-LDH为Ag/AgCl提供了负载的基底材料.反应过程中吸附和动力学均起到一定的作用.Coupling ZnAl-LDH,with Ag/AgCl/to synthesize Ag/AgCl/ZnAl-LDH composite photocatalyst.The samples were characterized by XRD,SEM,TEM,BET and UV-Vis.The characterization results showed that the prepared AgCl loaded with ZnAl-LDH had a typical hydrotalcite structure,on which AgCl particles loaded.The photocatalytic activity test result showed that the methyl orange(MO)degradation percentage of 95.2%under the conditions of 25%AgCl loading,was obtained under visible light irradiation of 180 min at the MO concentration of 25 mg/L and catalyst dosage of 1 g/L.The photocatalytic mechanism is deduced as following:under irradiation of visible light,Ag clusters are formed on the surface of AgCl,and in turn the electrons and holes are produced on Ag clusters,and then transfer to AgCl particles,forming·O_(2)^(-)and·Cl active radicals,respectively,and then oxidize MO for decomposition.While ZnAl-LDH provides the substrate for Ag/AgCl particles.In the photocatalytic reaction process,both adsorption and kinetics affect the degradation of MO.

关 键 词：Ag/AgCl ZnAl-LDH 可见光 甲基橙 

分 类 号：O643.36[理学—物理化学]