摘要
通过共价交联、原位沉积以及光致还原反应得到Ag@AgCl/GO/CA不溶性光催化颗粒材料,采用SEM、TEM、FT-IR、Raman和BET对该光催化材料的形貌、元素组成及比表面积进行表征。通过光电流及电化学阻抗分析(EIS)评价光催化材料的光电性能,利用ESR自由基检测和猝灭试验分析其光催化机理。结果表明,Ag@AgCl纳米颗粒呈团簇状分布在GO/CA的褶皱状结构上,且Ag和AgCl比例约为1∶1。因存在配位交联作用,Ag@AgCl/GO/CA光催化材料的含氧官能团明显减少,GO的两个特征峰变弱。该材料具有较小的光生电子转移电阻和较低的光生电子-空穴复合率,表现出良好的光催化性能。在模拟废水的降解实验中,Ag@AgCl/GO/CA呈现良好的吸附性能、可见光吸收性能以及优良的循环使用稳定性能。在可见光下,Ag@AgCl/GO/CA对模拟废水中的RhB、MB和MO均有较高的催化降解活性,12 min内均可完全降解,且催化降解过程均符合准一级反应动力学关系。在光催化降解RhB过程中,产生的空穴(h^(+))、超氧离子自由基(O_(2)^(·-))是光催化降解污染物的主要活性物种。
Ag@AgCl/GO/CA photocatalytic materials were obtained by covalent cross-linking,in situ deposition and photoreduction.The morphology,elemental composition and specific surface of Ag@AgCl/GO/CA were characterized by SEM,TEM,FT-IR,Raman and BET.The photocatalytic properties were evaluated by photocurrent and electrochemical impedance spectroscopy(EIS),and the photocatalytic mechanism was analyzed by ESR radical detection and quenching tests.The results showed that Ag@AgCl nanoparticles were distributed in clusters on the folded structure of GO/CA,and the ratio of Ag to AgCl is about 1∶1.The oxygen-containing functional groups of the Ag@AgCl/GO/CA photocatalytic material were significantly reduced and the two characteristic peaks of GO became weaker due to the presence of coordination cross-linking.The material exhibited good photocatalytic performance with small photogenerated electron transfer resistance and low photogenerated electron-hole recombination rate.In the degradation experiments of simulated wastewater,Ag@AgCl/GO/CA showed good adsorption performance,visible light absorption performance and excellent recycling stability.Under visible light,Ag@AgCl/GO/CA showed high catalytic degradation activity for RhB,MB and MO in the simulated wastewater,and all of them could be completely degraded within12 min utes,and the catalytic degradation processes were in accordance with the pseudo first order reaction kinetics.During photocatalytic degradation of RhB,the generated holes(h^(+)),superoxide radicals(O_(2)^(·-))are the main active species in the photocatalytic degradation of pollutants.
作者
高大响
黄小忠
史和娣
GAO Daxiang;HUANG Xiaozhong;SHI Hedi(Jiangsu Vocational College of Agriculture and Forestry,Gourong 212400,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2022年第12期106-113,共8页
Industrial Water Treatment
基金
江苏农林职业技术学院科技项目(2021kj57)。
