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环境化学  2015 

Mg-Al型水滑石对水溶液中F-的吸附

Keywords: 水滑石,氟离子,吸附

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Abstract:

采用水热法合成Mg-Al型水滑石(LDHs),研究LDHs及其焙烧产物C-LDHs对水溶液中F-的吸附行为,并用X射线衍射和热重分析对LDHs,C-LDHs以及吸附F-后的C-LDHs(R-LDHs)的结构和性质进行了表征.结果表明LDHs对水溶液中的F-基本没有吸附,而C-LDHs对F-有较大的吸附容量,同时,酸性的增强有利于C-LDHs对F-的吸附.C-LDHs对F-吸附4h后可达到吸附平衡.通过吸附F-,C-LDHs的结构由吸附前的混合氧化物固溶体恢复到层状结构,表明C-LDHs对水溶液中F-的高吸附性能是因为其具有较强的"记忆效应".

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