快速共沉淀法制备Ce掺杂ZnO及其日光催化性能研究

Preparation of Ce doped ZnO by rapid coprecipitation and its solar catalytic property

采用氢氧化钠快速共沉淀法制备了Ce掺杂ZnO,以模拟日光催化降解罗丹明B为指标,优化Ce掺杂比例及煅烧温度,考察催化剂套用稳定性和适用性,最后对Ce掺杂ZnO活性机理进行分析。结果表明:Ce最佳掺杂摩尔分数为3%,500℃煅烧2h,对1.0×10^(-5) mol/L罗丹明B溶液40min降解率达到93.8%,6次套用降解率达到90%以上,对仲夏自然阳光和其他染料均有良好的适用性。Ce掺杂降低了光致空穴-电子复合率,有效的提升了光催化活性。

A type of cerium doped zinc oxide nano-scale catalyst was prepared by rapid coprecipitation method with sodium hydroxide.The doping ratio of cerium and calcination temperature were optimized by photocatalytic degradation of rhodamine B under simulated solar irradiation,and the stability and applicability of catalyst were investigated.Finally,the activity mechanism of Ce-doped ZnO was analyzed.The results indicated that the optimum amount of substance ratio of cerium was 3%,followed by calcining at 500℃ for 2 h.The degradation rate reached to93.8%in 40 min when applied to 1.0×10-5 mol/L RhB solution,and it was kept above 90% even after 6 cycles.Meanwhile,with good applicability to natural sunlight irradiation and other dyes.Cerium doping reduced the photo induced hole-electron recombination rate and enhanced the photocatalytic activity efficiently.