The Templating Effect Of The Macro-molecule During The Formation Of Layered Silicate

Nowadays, research and development of magadiite related materials are still in bugeoning in the field of material chemistry. Due to its excellent performance in ion exchange, adsorption and intercalation, magadiite is widely applied in catalysis, adsorption and noval advanced materials and so on. In recent years, the usage of magadiite is not confined in traditional areas such as adsorption material and intercalation material. Magadiite has been widely used as intercalation carrier to make new functional material for the interchangeable sodium ions between its layers. In this paper, we used hydrothermal synthesis method to get magadiite effectively using silica sol as feed. XRD was used to investigate the influence of crystallization reaction conditions on the synthesis of magadiite. CTMA was intercalated into the former synthesized magadiite to get CTMA-magadiite. At the same time, the synthesized CTMA-magadiite was used to react with PEG to get PEG-magadiite. XRD, SEM, XRF, IR, TG-DSC and Nitrogen adsorption-desorption techniques were used to systematically characterize the crystalline phase, appearance, thermal stability and surface area. The main results are as follows:1. Magadiite was synthesized by hydrothermal method using silica sol as feed and was characterized by a series of characterization methods. The synthesized magadiite has high crystallinity and purity, moreover, the basal space of it is15.6A and the image of magadiite reveals a rosette-like shape. The synthesized magadiite could maintain the integrity of the structure under250℃. The influence of crystallization condition on the synthesis of magadiite was discussed. After comprehensively consideration of the process and method of magadiite synthesis, we proposed that it could be easily synthesized in the laboratory which provides material insurance for the later synthesis of intercalation materials.2. Intercalation researches were carried out over the synthesized magadiite, and CTMA was successfully intercalated into the layers to get CTMA-magadiite. XRD results accounted that the basal spacing of CTMA was to31.3A which suggested that the magadiite was expended. In order to investigate the thermal stability of CTMA-magadiite, the synthesized CTMA-magadiite was calcinated at200℃and250℃for an hour, separately. The XRD results showed that CTMA-magadiite was stable as the temperature was below250℃. Moreover, the synthesized CTMA-magadiite was mixed with HCL and isopropanol for certain time, separately. The former materials after separation and desiccation were characterized by XRD and the results showed that CTMA-magadiite was stable under isopropanol however, CTMA+were exchanged by H+to form H-magadiite.3. CTMA-magadiite reacted with macromolecular polyethylene glycols to get PEG-magadiite. The products were characterized by XRD, as which showed that the basal spacing was enlarged to42.9A suggesting that the PEG had been successfully intercalated into the layers of magadiite.