摘要
利用离子交换法将AgBr负载到水热合成的麦羟硅钠石(magadiite,MD)载体上,通过光照还原生成新型Ag-AgBr/MD复合光催化剂;采用X射线衍射仪、扫描电镜、透射电镜分析了复合催化剂的结构,采用紫外-可见分光光度计评价了AgBr负载量和pH对复合催化剂可见光催化降解罗丹明(RhB)水溶液活性的影响.结果表明,随着AgBr负载量的增加,RhB的降解率先增大后减小,随pH的增大RhB的降解率减小.当n(AgNO3)∶n(MD)=2∶1,pH=9时,复合光催化剂具有较强的光吸收性能,且AgBr高度分散在载体MD表面,因而对RhB的光催化降解性能最高.
AgBr was loaded on magadiite（MD）support viaan ion exhcange route,followed by photoreduction affording a novel composite photocatalyst,Ag-AgBr/MD.The structure of assynthesized Ag-AgBr/MD photocatalyst was analyzed by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.Its catalytic activity towards the degradation of aqueous solution of Rhodamine B（RhB）under visible light irradiation,in relation to the effects of AgBr loading and pH value as well,was evaluated by ultraviolet-visible light spectrophotometry.Results show that the photocatalytic activity of Ag-AgBr/MD initially increases and then decreases with increasing loading of AgBr,and it decreases with increasing pH value.Particularly,Ag-AgBr/MD photocatalyst obtained at n（AgNO3）∶n（MD）=2∶1and a pH of9exhibits strong visible light absorption and contains well dispersed AgBr powders on the surface of MD support,and hence it possesses the best activity towards the photocatalyic degradation of RhB under visible light irradiation.
出处
《化学研究》
CAS
2014年第4期410-416,共7页
Chemical Research
基金
国家自然科学基金(11172043)
