稀土离子掺杂Ag3PO4的水热合成及其催化性能研究

Hydrothermal synthesis and catalytic property of rare earth ion doped AgPO

以硝酸银、磷酸氢二钠为原料,通过水热合成法合成磷酸银(Ag3PO4)半导体光催化剂,研究了Ce^3+,Er^3+,Eu^3+和Sm^3+稀土离子掺杂对Ag3PO4催化性能的影响。采用X射线衍射仪、扫描电子显微镜、紫外-可见分光光度计等对其结构和性能进行分析。以亚甲基蓝为模拟废液进行光催化降解实验,评价Ag3PO4的光催化性能。结果表明:制备的样品均为纯立方相Ag3PO4;质量浓度为10mg/L的亚甲基蓝溶液催化降解30min后,掺杂稀土离子的Ag3PO4样品催化性能明显比纯Ag3PO4的催化性能好,其中纯Ag3PO4的降解率为65.75%,掺杂1%(摩尔分数,下同)Ce^3+的Ag3PO4降解率为96.59%,掺杂1%Er^3+的Ag3PO4降解率为99.39%,掺杂1%Eu^3+的Ag3PO4降解率为95.39%,掺杂1%Sm^3+的Ag3PO4降解率为98.06%。经过3次循环降解后,掺杂1%Ce^3+的Ag3PO4降解率仍然达到56.13%。

The silver phosphate semiconductor photocatalyst was prepared by hydrothermal synthesis using silver nitrate and sodium dihydrogen phosphate as the main materials.The influence of Ce^3+,Er^3+,Eu^3+and Sm^3+rare earth ions doped with different molar mass on the catalytic properties and activity of the products was investigated.The structural characteristics were analyzed by XRD,SEM and visible light spectrophotometer.The photocatalytic properties of the material were evaluated by using methylene blue with concentration of 10 mg/L,as a simulated photocatalytic degradation experiment.The results showed that the catalytic performance of Ag3PO4 doped with rare earth ions after degradation of 30 min was better than that of pure Ag3PO4.The degradation rate of pure Ag3PO4 was 65.75%,mole fraction 1%Ce^3+Ag3PO4 was 96.59%,1%Er^3+Ag3PO4 was 99.39%,1%Eu^3+Ag3PO4 was 95.39%,and 1%Sm^3+Ag3PO4 was 98.06%.The degradation rate of 1%Ce^3+Ag3PO4 can also reached 56.13%after cycled for three times.