锂铝水滑石对水杨酸及其异构体的选择性插层研究(英文)

[LiAl_2(OH)_6]Cl·yH_2O was prepared by co-precipitation. The competitive intercalation of geometric isomers of hydroxybenzoic acid into the interlayer of layered double hydroxides (LDHs) was studied by the reaction of [LiAl_2(OH)_6]Cl·yH_2O with various mixtures of o-hydroxybenzoic acid, m-hydroxybenzoic acid and p-hydroxybenzoic acid. Powder X-ray diffraction (XRD) results confirmed the intercalation of the isomers, and high performance liquid chromatography (HPLC) was used for the quantitative study. The order of the preferential intercalation of the three isomers was found to be: o-hydroxybenzoic acid (1,2-C_7H_6O_3)》 p-hydroxybenzoic acid (1,4-C_7H_6O_3) > m-hydroxybenzoic acid (1,3-C_7H_6O_3).

锌铝类水滑石的复原及表征(英文)

本文采用焙烧复原法,在70℃以80%的乙醇溶液为分散介质,有机酸阴离子与煅烧后的锌铝类水滑石的物质的量之比为1∶9的条件下,实现了苯甲酸及苯二甲酸异构阴离子与锌铝类水滑石的插层反应,同时,还进行了等物质的量的两种酸与锌铝类水滑石(1∶1∶9)的插层反应。利用XRD和IR测试技术对样品结构进行表征,UV及HPLC对有机酸的反应量进行定量,并采用Gaussian鄄98软件包中abinitio分子轨道法(HF/6鄄31G)计算了各有机酸阴离子的分子结构,分析了其结构与插层行为的关系,并理论结合实验给出了各有机酸阴离子在锌铝类水滑石层间可能的空间构型。研究结果表明,苯甲酸及苯二甲酸异构阴离子在插层过程中表现出选择性,其优先进入锌铝类水滑石层间的顺序是:对苯二甲酸>邻苯二甲酸>间苯二甲酸>苯甲酸,且锌铝类水滑石对对苯二甲酸表现出较高的选择性,是环境友好的分离方法。