新型Ag_2WO_4光催化剂的合成及其催化性能研究

Synthesis and Photocatalytic Activity of A Novel Photocatalyst Ag_2 WO_4

采用水热合成法,以硝酸银和钨酸钠为起始原料,成功制备了Ag2WO4光催化剂。借助X射线衍射(XRD)、紫外光谱(UV-Vis)等测试技术对样品相组成和吸收特性进行表征。同时考察了Ag2WO4光催化剂对甲基橙溶液的光催化降解活性,研究了光照时间对甲基橙溶液降解率的影响。XRD分析结果表明,所得样品为单聚体的Ag2WO4,属于四方晶系,空间群为Pn2n,且样品的纯度较高。吸收光谱表明在200 nm^400 nm波长范围内有较强的吸收。Ag2WO4对甲基橙溶液具有较好的光催化活性,且光源对活性影响显著。

Ag2WO4 photocatalyst was successfully synthesized via a aqueous precipitation process using AgNO3 and NaWO4 as raw materials. The obtained sample was characterized by X - ray diffraction （XRD） and solid - UV - Vis techniques. Photodegradation of Methyl Orange （ MO ） was studied with Ag2 WO4 under experiment light recourse of xeon lamp and high press mercury lamp. The XRD result showed that the sample Ag2WO4 synthesized in a high purity belongs to tetragonal and space group is Pn2n. UV - Vis spectrum showned that the sample has a strong ab- sorption between 200 nm and 400 nm. The photodegradation experiment showed that MO was more easily photodeg- radated with Ag2WO4 and simulated sunlight.