ZnO微观形貌对其催化性能影响的研究

Study on the Effect of ZnO Microstructure on Its Catalytic Performance

利用高温分解法、沉淀法与水热法分别制备了微观形貌、粉体粒径尺寸各异的ZnO半导体催化材料。采用X射线粉末衍射、扫描电镜和紫外可见分光光度计等表征手段对所得催化材料的物相组成及微观形貌进行了详细分析,并研究了ZnO半导体材料对有机染料甲基橙(MO)的氧化降解效率。研究结果表明,相比其它两种方法合成的球形和不规则形貌的ZnO催化剂,通过水热法得到亚微米级棒状结构ZnO半导体材料表现出较高的催化活性,其能够有效活化过硫酸氢钾(PMS)产生氧化活性物种,经过3 min催化氧化反应后,MO的去除率达到100%。

The ZnO materials with different morphologies and particle sizes are synthesized by pyrolysis method,precipitation method and hydrothermal process,respectively.The phase composition,micromorphology and particle-size distribution of ZnO are analyzed thoroughly by XRD,SEM and UV/VIS spectrophotometer and the catalytic oxidation properties of the samples for the degradation of methyl orange(MO)are investigated.The results show that the sub-micron rod-like ZnO semiconductor materials synthesized by hydrothermal method present superior catalytic oxidation activity and removal rate than that of round-like and irregular ZnO materials prepared by other two methods.In particular,the removal rate of MO can reach 100%within 3 min after catalyzed by rod-like ZnO sample,which can efficiently activating the potassium hydrogen persulfate(PMS)to generate oxidizing active species.