Ce掺杂ZnO光催化剂的制备及性能

Synthesis and Photocatalytic Activity of Ce--doped ZnO Catalyst

采用共沉淀制备了稀土Ce掺杂ZnO光催化剂；利用X射线衍射（XRD）、扫描电子显微镜（SEM）等对光催化剂进行表征；考察了不同NaOH用量制备的催化剂光催化对亚甲基蓝脱色降解性能的影响。结果表明，ce的掺杂有利于抑制光生电子-空穴的复合，显著提高ZnO的光催化性；NaOH用量和Ce掺杂量对光催化剂的微观形貌和光催化活性有较大影响；制备过程中金属离子总量（Ce^3＋＋Zn^2＋）与OH-摩尔比为1：2．5，掺杂量为2％（摩尔分数）时，制备的催化剂主要微观形貌为具有层状微球结构，光催化性能良好。

Ce--doped ZnO photocatalysts were synthesized via co--precipitation and roasting processes. The samples were characterized by X--ray diffraction （XRD）, scanning electron microscopy （SEM） respectively. Photocatalytic activities of Ce-- doped ZnO were investigated in lAW light for degradation of methylene blue （MB） solution. The results indicated that the pres- ence Ce effectively suppressed the recombination of the photogenerated electron--hole pairs and increased the photocatalytic ac- tivity. The ratio of （Ce^3＋ ＋ Zn^2＋ ） to OH- and doping level had great influence on morphology, structures, and proper- ties. When the （Ce3＋ ＋Zn2＋ ） /OH- =1 ： 2. 5 and the concentration of Ce was 2mol%, the photocatalysts show well photo- catalytic activity.