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OALib Journal期刊
ISSN: 2333-9721
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mg--al水滑石的改性机理和吸附性能
Keywords: 无机非金属材料,镁铝水滑石,吸附,酸溶过程
Abstract:
？用硫酸铵对镁铝水滑石进行改性,研究了镁铝水滑石的溶解性及硫酸铵的改性机理。结果表明,镁铝水滑石在ph1.0--11.0范围内呈现出完全溶解、部分溶解和基本不溶三种溶解特性。硫酸铵的改性即为镁铝水滑石的部分溶解过程,层板中镁以mg2+形态进入溶液,导致羟基铝(al(oh)63-)进入溶液形成keggin结构(al13聚集体),al13聚集体附着在镁铝水滑石层板表面形成无定形al(oh)3,从而阻止镁离子进一步溶出。改性镁铝水滑石对pb2+的吸附率提高了18.3%,是比表面积的增加、化学键合及静电吸附能力的提升所致。
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