直接沉淀法制备纳米氧化锌晶体及其光催化降解性能研究

Preparation of Nano ZnO Crystallization by the Direct Precipitation and Its Characteristic Photodegradation

以乙酸锌(Zn(CH3COO)2)和草酸(H2C2O4)为原料,采用直接沉淀法,分别在水相和有机相中,制备出两份纳米氧化锌。以它们作为光催化剂,考察了酸性红G水溶液在可见光下的褪色实验和N,N-二甲基乙酰胺(DMAC)水溶液紫外光催化降解实验。实验结果表明:(1)直接沉淀法制备的两份样品,经X衍射和扫描电镜分析是纳米氧化锌;以它们作为光催化剂,都能使酸性红G,在可见光下褪色,褪色速率与ZnO纳米粒度有关。(2)加入纳米氧化锌能够提高DMAC水溶液的紫外降解速率;降解过程中发生了去甲基化反应,产物是N,N-二甲基甲酰胺。

Nano-zinc oxide erystallisation was prepared using zinc acetate and oxalic acid as raw materials by the direct precipitation. To study of the capability of photoeatalytic degradation of zinc oxide crystallisation obtained in aqueous and organic solvents, the degradation of azorubine G was carried out under the sunlight in condition of ultraviolet light avoidance. In addition, we also researched the role of zinc oxide crystallisations as a photo catalyst in degradation of the N, N-methyl-acetamide solution under ultraviolet light. The result showed that ： （ 1 ） the two piece of sample are nano-zinc oxide crystallisations by X difference and SEM; As a photo catalyst, it can have azorubine G solution faded under visible light and the fading rate depends on the size of the zinc oxide prepared. （2） It can improve the degradation of N, N-methyl-acetamide to add the zinc oxide and it happened the demethyl reaction then N, N-dim were produced. rate etylwere produced.