选用高岭石和蒙脱石为对象研究次生硅酸盐矿物对菲光降解过程产生的影响,并以石英砂作为对照.由于3种矿物的表面积、结构组成、表面电荷、阳离子交换能力不同,导致吸附性能不同,对菲的吸附能力呈现出蒙脱石＞高岭石＞石英砂.以发射波长为254 nm的紫外灯为光源,在3种矿物中进行菲光化学降解实验,探讨不同矿物中菲光化学降解行为的区别.紫外光辐射对3种矿物中菲的去除都符合一级反应动力学,24 h后菲的去除效果为:石英砂＞高岭石＞蒙脱石,与矿物吸附能力的大小有密切关系.与避光对照组相比,去除率整体上呈现出光照＞避光,表明紫外光辐射可以显著促进自然环境中菲的转化和降解.通过GC-MS检测到菲光降解的主要产物为邻苯二甲酸二(2+乙基己基)酯、烷烃、苯酚等,表明菲经过紫外光辐射会逐渐变成低毒或无毒物质,最终被矿化.
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