摘要
为了增强ZnIn_(2)S_(4)光催化降解石化污水的性能,将AuPd双金属助催化剂沉积到ZnIn_(2)S_(4)表面,合成了不同AuPd比例的AuPd/ZnIn_(2)S_(4)复合光催化剂。采用XRD、BET、SEM、TEM、XPS、电化学测试等技术对AuPd/ZnIn_(2)S_(4)的结构进行了详细的表征。AuPd超细纳米合金的负载,不仅可以为光催化反应提供更多的热电子参与反应,还能有效促进光生载流子的分离和传输。以苯胺作为模型化合物考察了AuPd/ZnIn_(2)S_(4)光催化降解石化污水的性能。当Au与Pd的质量比为4∶6时,得到的复合光催化剂表现出最佳的光催化性能和良好的光催化稳定性。经过120 min的反应,可以将初始浓度100 ppm的苯胺降解98.4%,苯胺相应的一级反应速率常数为0.0342 min-1,分别是在ZnIn_(2)S_(4)、Pd/ZnIn_(2)S_(4)和Au/ZnIn_(2)S_(4)表面的10.6、5.5和3.7倍。研究了溶液的pH值、苯胺的初始浓度、光催化剂的浓度和不同的牺牲试剂对光催化降解苯胺性能的影响,并考察了AuPd/ZnIn_(2)S_(4)光催化降解真实石化污水的性能。
AuPd bimetallic cocatalyst was deposited on the surface of ZnIn_(2)S_(4)to synthesize AuPd/ZnIn_(2)S_(4)composite photocatalysts with different AuPd ratio.The structure of AuPd/ZnIn_(2)S_(4)was characterized by XRD,BET,SEM,TEM,XPS and electrochemical analysis.The loading of AuPd ultrafine alloy nanoparticles can not only provide more hot electrons for photocatalytic reaction,but also effectively improve the separation and transportation of the photogenerated charges.The photocatalytic performance for petrochemical wastewater over AuPd/ZnIn_(2)S_(4)composites was investigated using aniline as a model pollutant.When the mass ratio of Au to Pd was 4∶6,the obtained composite exhibited the optimum photocatalytic activity and good stability.After 120 min of reaction,98.4%aniline with an initial concentration of 100 ppm can be degraded,and the corresponding first-order reaction rate constant was 0.0342 min-1,which is 10.6,5.5 and 3.7 times of that over ZnIn_(2)S_(4),Pd/ZnIn_(2)S_(4)and Au/ZnIn_(2)S_(4),respectively.The effect of pH value of the aniline solution,initial concentration of aniline,photocatalyst dosage and different sacrificial reagents on the performance of photocatalytic degradation of aniline were studied for obtaining maximum degradation.Furthermore,a real petrochemical wastewater was evaluated for investigating the photocatalytic ability of the as-prepared composite photocatalyst in real case studies.
作者
陈楚晓
郝京华
CHEN Chu-xiao;HAO Jing-hua(Hebei Vocational University of Industry and Technology,Shijiazhuang 050000,China;Harbin Institute of Technology,Harbin 150090,China;Shijiazhuang Municipal Ecology and Environment Bureau,Shijiazhuang 050000,China)
出处
《化学研究与应用》
CAS
北大核心
2023年第5期1185-1194,共10页
Chemical Research and Application
基金
中央高校基本科研业务费项目(2572020CB22)资助
黑龙江省博士后科研项目(LBH-Z14013)资助
哈尔滨市科技局科研项目(2021RQQXJ063)资助。
