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首页> 外文期刊>Bulletin of the Chemical Society of Japan >The Synthesis and Phosphate Adsorptive Properties of Mg(II)-Mn(III) Layered Double Hydroxides and Their Heat-Treated Materials
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The Synthesis and Phosphate Adsorptive Properties of Mg(II)-Mn(III) Layered Double Hydroxides and Their Heat-Treated Materials

机译：Mg（II）-Mn（III）层状双氢氧化物及其热处理材料的合成及对磷酸盐的吸附性能

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摘要

Hydrotalcite-like layered double hydroxides (LDHs) of Mg(II) and Mn(III) were prepared by a co-precipitation/air oxidation method using MgCl_2 and MnCl_2 as starting materials.Syntheses were studied at different precipitation temperatures and variable starting Mg/Mn ratios.MgMn-LDH were obtained at a preparation temperature below 333 K.Samples prepared at a Mg/Mn ratio of 3 showed a crystalline LDH phase having a basal spacing of 7.85 A.The LDH prepared at lower Mg/Mn ratios had slightly less crystalline phase,with lower basal spacing.Calcination of MgMn-LDH at 573 K for 4 h in air resulted in a transformation from a layered to an amorphous phase,accompanied by a loss of interlayer water and a partial loss of carbonate ions.Chemical analysis and IR studies showed that oxidation from Mn(III) to Mn(IV) progressed during the calcinations,and that HCO_3~- was formed in the calcined solid.Equilibrium distribution coefficients (K_d) of different kinds of anions were measured for the uncalcined and calcined samples.The selectivity sequences were Cl~-
机译：以MgCl_2和MnCl_2为起始原料，采用共沉淀/空气氧化法制备了Mg（II）和Mn（III）的类水滑石层状双氢氧化物（LDHs），研究了在不同的沉淀温度和变化的起始Mg /下的合成过程。 Mn比.MgMn-LDH在低于333 K的制备温度下获得.Mg / Mn比为3的样品显示出结晶的LDH相的基础间距为7.85 A. MgMn-LDH在573 K下空气中煅烧4 h导致从层状相转变为无定形相，伴随着层间水的损失和部分碳酸根离子的损失。分析和红外研究表明，煅烧过程中从Mn（III）氧化成Mn（IV），并在煅烧的固体中形成HCO_3〜-。测定了不同种类阴离子的平衡分布系数（K_d）。选择性顺序为Cl〜-

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