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
阎美新 1索红月 1申延明 1刘东斌 1樊丽辉1
作者信息
- 1. 沈阳化工大学化学工程学院,辽宁沈阳 110142
- 折叠
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·O2-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.
Abstract
Coupling ZnAl-LDH,with Ag/AgCl/to synthesize Ag/AgCl/ZnAl-LDH composite pho-tocatalyst.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 photo-catalytic 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Key words
Ag/AgCl/ZnAl-LDH/visible light/methyl orange引用本文复制引用
出版年
2024
NETL
NSTL
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