Arsenate has high affinity for soluble hydroxy-Fe species and Fe-oxyhydroxide pre-cipitates. In addition, the hydrolysis of Fe(III) and the growth of the initially precipitated Fe(III) phases are strongly influenced by the presence of montmorillonite. In this paper, the adsorption of As onto various hydroxy-Fe-montmorillonite (H-F-M) complexes was studied. Three systems of samples were prepared by mixing montmorillonite, hydroxy-Fe and arsenate in different se-quences: (1) Prior mixing of montmorillonite and hydroxy-Fe before the addition of arsenate; (2) prior mixing of hydroxy-Fe and arsenate before the addition of montmorillonite; and (3) prior mixing of montmorillonite and arsenate before the addition of hydroxy-Fe. For each system, the effects of pH, ionic strength, temperature, initial Fe and As concentrations and adsorption dura-tion on the overall uptake of As by H-F-M complexes were studied. Results showed that the up-take of As increased with increasing pH, temperature, initial Fe concentration and adsorption duration, and decreased with increasing ionic strength and initial As concentration to different extents for the three systems. The variation of the As uptake of H-F-M complexes with pH in the range of study is opposite to that reported previously for Fe-O-H systems in the absence of montmorillonite and similar to that reported for montmorillonite in the absence of hydroxy-Fe. The marked influence of ionic strength on the As uptake of H-F-M complexes indicates that outer-sphere complexation plays an important role. This is quite different from the adsorption of As on the surface of either Fe-oxyhydroxides or montmorillonite alone in which inner-sphere complexation dominates. Under all experimental conditions, the H-F-M complexes studied dis-played a very strong affinity for As, among which system 2 had the highest As adsorption capac-ity and system 1 the lowest. The authors attribute this to the differences in mixing sequence which resulted in more hydroxy-Fe (the main adsorbent for As) in system 1 adsorbing onto montmorillonite before adsorbing As than in systems 2 or 3.

热处理脱除有机模板易导致VPO体系孔道结构化合物结构破坏，从而阻碍此类材料的实际应用。以孔道结构化合物（H3NCH2CH2NH3）3[（VO）4（PO4）2（HPO4）4]（简称V2P32en）为研究对象，利用热分析（DSC2TG）、动态原位高温X2射线衍射（XRD）及多功能X2射线光电子能谱（XPS）等方法，研究了该化合物在不同气氛热处理过程中模板脱除及结构演化规律，重点探讨了钒氧化态的变化对结构稳定性的影响。结果表明，加热过程中随着有机模板的分解脱除，形成较强的还原环境，骨架中的部分钒被还原（V4+→V3+），使原有的配位环境（[VⅣO5]三角双锥、[VⅣO6]畸变八面体）与钒的氧化态不符而导致结构重组。因此，钒氧化态的变化是影响热稳定性的重要因素之一。

采用TiCl4水解法制备钛柱化剂,与蒙脱石离子交换后得到钛柱撑蒙脱石（Ti-pillared montmorillonite, Ti-PILM）。对制备的TiPILM采用室温风干（airdrying, AD）、40℃烘干（common drying, CD）、乙醇清洗后风干（et hanol ext raction drying, EAD）、室温条件下真空干燥（vacuum drying, VD） 等方法干燥,并在不同温度下热处理。用XRD, IR, DTA TG, N2等温吸附脱附等技术对Ti PILM 进行结构表征。结果表明：干燥方法对Ti-PILM 的结构及热稳定性有较大的影响。采用AD和EAD干燥方法可以得到2.7nm左右大晶面间距Ti-PILM，且AD干燥的样品在500℃下有很好的稳定性,比表面达285.7m2/g, 具有介孔孔径且孔径分布窄。而经CD和VD方法干燥焙烧后,蒙脱石层间钛柱坍塌,导致Ti-PILM 层状结构破坏,影响材料的热稳定性。

以成因、类型、性质不同的6种蒙脱石为原料，制备了有机插层和聚酰胺6/蒙脱石纳米复合材料。研究了蒙脱石矿物类型、成分及阳离子交换容量对其有机插层及聚合剥离的影响。结果表明：有机插层蒙脱石层间距随插层剂用量及阳离子交换容量的增加而增加，低阳离子交换容量及高钠含量蒙脱石更有利于插层剥离。钠化对蒙脱石有机插层影响不明显。

本文采用TiCl4在HCl中水解制备二氧化钛柱撑蒙脱石（TiO2-PILM）纳米材料，通过X射线衍射和BETN2比表面积分析对其进行表征，并研究其对苯酚在紫外光下的催化降解曲线，考察了苯酚的初始浓度、TiO2-PILM投放量、苯酚溶液pH值对光催化降解效果的影响。结果表明，制备的结构稳定的TiO2-PILM具有2.26nm大晶面间距和285.7m2/g大比表面积。TiO2-PILM对苯酚有一定的光催化降解性，其过程是先吸附后降解。随苯酚初始浓度、TiO2-PILM投入量和苯酚溶液pH值的升高，TiO2-PILM对苯酚降解速率增大。在苯酚初始浓度为5mg/L、投样量为1gPL、pH为10时，TiO2-PILM对苯酚有较好的降解效果。