Snx Zn（1-x）WO4光催化剂的水热合成及其可见光催化活性

摘要

The novel visible-light photocatalysts Snx Zn(1-x)WO4 was synthesized by hydrothermal method. The influence of Zn2+/Sn2+ molar ratio,hydrothermal synthetic temperature and time on photocatalytic activitiy of SnxZn(1-x)WO4 catalysts was investigated by using methyl orange dye wastewater as probe pollutant. The as-prepared SnxZn(1-x)WO4 catalysts were characterized by SEM and BET. The results showed that Sn0. 8 Zn0. 2WO4 photocatalyst possessed the best photocatalytic activity under the preparation condition of Zn2+/Sn2+ molar ratio 0. 25,hydrothomal reaction temperature 100 ℃ and hydrothomal reaction time 12 h. After visible-light illumination for 30 min,methyl orange degradation rate over Sn0. 8 Zn0. 2WO4 photocatalyst was 98. 62%,which was 46. 66% higher than that over SnWO4 prepared under the condition of original pH and 160℃ hydrothermal reaction for 24 h. Therefore,Snx Zn(1-x)WO4 synthesized by hydrothermal method exhibited excellent photocatalytic activity under visible light irradiation.%采用水热合成法制备新型可见光催化剂Snx Zn（1-x）WO4，以甲基橙染料废水为探针污染物，考察Zn2+与Sn2+物质的量比、水热温度和水热时间对Snx Zn（1-x）WO4光催化剂的催化活性、表面形貌和比表面积的影响。结果表明，在Zn2+与Sn2+物质的量比为0.25、水热温度100℃和水热时间12 h条件下，合成的Sn0.8 Zn0.2 WO4催化剂活性最好，光照30 min后，对甲基橙染料的脱色率达98.62%，较SnWO4催化剂（合成条件为原始pH值，160℃水热反应24 h）提高46.66%。采用水热合成法制备的催化剂Snx Zn（1-x）WO4具有良好的可见光活性。