摘要
采用水热法和光致还原法制备了具有等离子体共振效应的Ag@AgBr可见光催化剂,利用XRD,SEM,EDX,DRS和XPS等手段对产物的结构和性能进行表征,并研究了催化剂在可见光下对罗丹明B(RhB)的光催化降解性能,考察了催化剂的循环使用及捕获剂对Ag@AgBr光催化性能的影响.结果表明:贵金属Ag纳米粒子的表面等离子体共振效应可显著增强Ag@AgBr对可见光的吸收;催化剂对罗丹明B具有较高的可见光降解活性和稳定性,在可见光下照射90 min,对罗丹明B的降解率达95%以上,光催化剂循环使用5次仍具有良好的光催化降解活性;淬灭实验表明在Ag@AgBr降解罗丹明B过程中,吸附在催化剂表面的h+、·OH、O2·-是主要的活性物种.
A highly efficient and stable visible light driven Ag@ AgBr plasmonic photocatalyst was successfully fab- ricated through a hydrothermal and subsequently photo-reduction method. The as-prepared samples were character- ized using XRD, SEM, EDX, DRS and XPS methods. The photocatalytic activities of the samples were evaluated by the degradation of Rhodamine B （RhB） under visible light irradiation. Recycling runs and scavengers were ex- amined. The results show that the as-prepared Ag@ AgBr plasmonic photocatalysts showed a strong absorption in visible light region, which attributes to the plasmon resonance of Ag NPs anchored on the surface of AgBr particles. The obtained Ag@ AgBr photocatalyst showed excellent and stable photocatalytic performance for the degradation of RhB and more than 95% of RhB could be degradated in 90 min under visible light irradiation. Besides, after five recycled experiments the photocatalytic activity almost kept unchanged. The photodegradation was greatly sup- pressed by benzoquinone while slightly decreased by isopropanol and NaHCO3. The mechanism for the degradation of RhB by Ag@ AgBr under visible light irradiation was discussed.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2013年第5期452-458,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金资助项目(51172063
51202056
51372068)
河北省自然科学基金项目(E2012401070)
