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采用液相共沉淀法合成了镁铁型层状双氢氧化物（简称Ｍｇ－Ｆｅ－ＬＤＨｓ）纳米颗粒，考察了粒子形貌、化学组成、晶体结构、阴离子交换容量及原料配比的影响．结果表明，所合成样品为片状纳米颗粒，化学组成与原料配比基本一致．在所研究的原料配比范围内，产品中ｎ（Ｍｇ）∶ｎ（Ｆｅ）在２∶１～４∶１范围内，产品具有水滑石层状六方晶系结构．随ｎ（Ｍｇ）∶ｎ（Ｆｅ）从２∶１增大到４∶１，粒径增大（从３７．９ｎｍ增大到６１．２ｎｍ），六方晶格参数ａ降低（变化范围为０．３１７～０．３１０ｎｍ），而六方晶格参数ｃ增大（变化范围为２．３８０～２．４１２ｎｍ），层间距增大（从０．７９３ｎｍ增大到０．８０４ｎｍ），阴离子交换容量增大（从０．５２ｍｍｏｌ／ｇ增大到１．２８ｍｍｏｌ／ｇ）
The Mg-Fe-LDHs nanoparticles were synthesized by liquid coprecipitation method. The effects of particle morphology, chemical composition, crystal structure, anion exchange capacity and the ratio of raw materials were investigated. The results show that the synthesized sample is flaky nanoparticles, the chemical composition and the ratio of raw materials are basically the same. In the range of the raw materials studied, n (Mg): n (Fe) in the product is in the range of 2: 1 ~ 4: 1, and the product has a hexagonal layered structure of hydrotalcite. With the increase of n (Mg): n (Fe) from 2: 1 to 4: 1, the particle size increases (from 37.9nm to 61.2nm) and the hexagonal lattice parameter a decreases (the variation range is 0). 317 ~ 0.310nm), while the hexagonal lattice parameter c increases (the range of variation is 2.380 ~ 2.412nm), the interlayer spacing increases from 0.793nm to 0.804nm, and the anion exchange capacity increases (From 0.52 mmol / g to 1.28 mmol / g)