Clarification of Layer-Anion Interaction of Layered Double Hydroxide for Realizing Highly Selective Anion Exchange

为了将具有阴离子交换能力的层状双金属氢氧化物（LDH）应用于水处理工艺，对水热法合成的Mg/Al（Mg/Al = 2）和Ni/Al（Ni/Al =2，3，4）两种LDH进行了阴离子交换实验和晶体结构分析。结果表明，Ni/Al比对Ni/Al-LDH的硝酸盐选择性有显著影响。此外，还发现其显著的硝酸盐选择性可能是由于层间引入阴离子的迁移能力不同所致。

For applying layered double hydroxide (LDH) with anion-exchangeable ability to water purification process, both anion exchange reaction experiments and crystal structure analysis of LDH consisting of Mg and Al (Mg/Al = 2), and Ni and Al (Ni/Al =2, 3, 4)synthesized by hydrothermal method were investigated. It could be found that Ni/Al ratio had remarkable influence on nitrate selectivity of Ni/Al-LDH. Moreover, it could be found that his remarkable nitrate selectivity could be caused by the difference of movability of incorporated anions in interlayer spaece.