摘要
采用超声辅助沉淀-沉积及光致还原法制备可见光响应的Ag@AgBrH2WO4异质结型光催化剂。采用X射线粉末衍射、扫描电镜和紫外-可见漫反射光谱对其进行表征。以盐酸莫西沙星为模型污染物,对该催化剂在可见光(λ>420 nm)下的催化活性和稳定性进行了评价,并分别以KI、甲醇、碳酸氢钠为空穴和自由基捕获剂研究了Ag@AgBrH2WO4的光催化反应机理。实验结果表明异质结型Ag@AgBrH2WO4光催化剂在可见光下光照20 min时对盐酸莫西沙星的降解率高达94.8%,样品经4次循环使用后催化活性基本保持不变。催化机理研究表明空穴和.O2-是光催化反应中主要的氧化性物质。
Ag@AgBrH2WO4 heterojunction was prepared via the ultrasonic-assisted deposition-precipitation and photo-reduction method.The synthesized samples were characterized by X-ray diffraction,scanning electron microcopy and UV-Vis diffuse spectroscopy.The photocatalytic activity and stability of the prepared samples were evaluated by the degradation of Moxifloxacin Hydrochloride under visible light（λ420 nm） irradiation.The photocatalysis reactive mechanisms were investigated using KI,methanol,and NaHCO3 as scavengers.The results showed the photocatalytic activity of Ag@AgBrH2WO4 reached 94.8% in Moxifloxacin Hydrochloride aqueous solution under visible light irradiation within 20 min.And it almost kept unchanged after four-cycle photocatalytic test.The quenching effect of different scavengers proves that reactive h＋ and ·O2-played the major role in the degradation process.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第6期1709-1714,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(50778083)
国家科技重大专项(2008ZX07317-001)
江苏大学博士创新基金(CX10B_023X)
