均匀沉淀法制备纳米ZnO及其光催化研究

Preparation of Nano-ZnO with Homogeneous Precipitation and Its Photocatalytic Properity

通过控制溶液的pH为8,确保溶液中碳酸根以碳酸氢根形式存在,通过加热使碳酸氢根分解为碳酸根生成碳酸锌沉淀,碳酸锌煅烧分解为氧化锌。采用均匀沉淀法制备纳米氧化锌,利用X射线衍射(XRD)、扫描电镜(SEM)、紫外(UV)和红外(IR)光谱对所制备催化剂进行表征。通过光催化降解罗丹明B(RhB),研究氧化锌的光催化性能。分别考察了催化剂的质量、pH值、双氧水的体积、光催化时间对光催化效果的影响。结果表明,100mL罗丹明B溶液加入24mg催化剂、pH=4、H2O2加入体积为2mL时,130min光催完毕。

In this work ,controlling the pH of the solution was 8 ,which ensure that the carbonate exists in the form of bicarbonate .The bicarbonate were decomposed carbonate by heating .The carbonate and zinc ions producted zinc carbonate precipitation ,zinc carbonate were decomposed ZnO by calcination . Nanometer ZnO were preparated by homogeneous precipitation .Samples were characterized by X-ray diffraction（XRD） ,scanning electron microscopy（SEM） ,UV spectroscopy . The rhodamine B（RhB） was aim of degradation .The photocatalytic activity of the samples was evaluated by the photocatalyst of rhodamine B（RhB） under UV light irradiation .It was studied on effects of catalyst dosage ,pH and H2O2 dosage on photocatalytic time .The experimental results show 100 mL RhB was completely photocatalized in 130 min under adding the mass of calalyst was 24 mg ,pH was 4 and the volue of H2 O2 was 2 mL .