稀土元素Pr掺杂对ZnO材料结构及光催化性能的影响

Effect of rare earth elements Pr doping on photocatalytic performance of ZnO

采用溶胶-凝胶法制备了稀土元素Pr掺杂的纳米ZnO光催化剂,利用XRD、SEM、EDS及亚甲基蓝降解实验对样品的结构与性能进行了表征和测试。研究表明,与纯ZnO相比,掺杂Pr能有效促进ZnO的晶粒细化,稀土元素Pr以Pr2O3化学态形式高度分散在ZnO表面,增加了催化剂表面氧空位,改变了ZnO的晶格缺陷和光吸收范围,明显提高了ZnO的光催化性能。在摩尔比n(Pr)∶n(ZnO)=0.03∶0.97时,制得样品Zn0.97Pr0.03O的光催化性能最好,紫外灯照射150 min后,对亚甲基蓝的降解率为94.5%,比纯ZnO的降解效率提高了32.5%,对苯酚溶液和间苯二酚溶液的降解效率分别为82.2%,91.5%。

The rare earth element Pr-doped nano-ZnO photocatalyst was prepared by sol-gel method.The structure and properties of the sample were characterized by XRD,SEM,EDS and methylene blue degradation experiments.The results show that compared with pure ZnO,the Pr-doped in the sample can effectively promote the grain refinement of ZnO.The rare earth element Pr is highly dispersed in the surface of ZnO in the form of Pr2O3,which increases the surface oxygen vacancies of the catalyst and changes the lattice defects of ZnO.And the light absorption range significantly improves the photocatalytic performance of ZnO.When the molar ratio is n(Pr)∶n(ZnO)=0.03∶0.97,the photocatalytic performance for the sample of Zn0.97Pr0.03O was the best.After UV lamp irradiation for 150 min,the degradation rate of methylene blue was about 94.5%.Compared with pure ZnO,the degradation efficiency was increased by 32.5%,and the degradation efficiencies of phenol solution and resorcinol solution were about 82.2% and 91.5%,respectively.