分别以溴代甲基咪唑反应型离子液体[C4mim] Br、[C8mim] Br和[C12mim] Br作为溴源和软模板,通过乙二醇溶剂热处理,获得了3种不同形貌结构的溴化氧铋(BiOBr)微粉.X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积测定的表征结果证实,产物均属四方晶系,纯度较高,且随着离子液体中阳离子取代基上碳原子数(Cn)的增多,BiOBr晶体沿着(110)晶面择优生长;微米级的BiOBr产物颗粒均是由纳米尺度的花瓣状薄片相互簇集、自组装而形成,呈球心放射状,粒径和表面孔隙均随Cn的增加而减小,但比表面积随之而增大.可见光降解苯胺的结果表明,3种BiOBr催化剂的催化活性不同,反应280 min时,降解率依次为54.13％、78.67％和95.06％;光生空穴是光降解过程的主要活性物质,羟基自由基所起的作用较小.
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