Preparation Of Novel Dearsenic Ionic Sieve And Investigate Of Its Mechanism

This thesis focused on the investigation and development of the dearsenic ionic sieve, a novel ecotypic and environmental material, which has the function to decontaminate the trace arsenic directly. Two main aspects were included in the thesis. Firstly, two kinds of novel inorganic non-stoichiometric compounds with special planar structure were developed. By the chemical preparation method, the selective separation and bond combination capability of the sieve for the given ions was enhanced. Specially, the prepared sieve can effectively capture the deleterious arsenic ion with high separation capability and deep adsorption. Secondly, the prepared material can not only be used in the deep dearsenic process of the drinking water, but also can be used in the dearsenic process of the lixivium of vegetation. The trace arsenic in the complex systems can be decontaminated effectively and the material has very high resistant ability to the pollutant.The preparation of the pillared dearsenic materials, the performance characterization, the enhancement and intensify of the adsorption process by the external introduction of energy and the physical and chemical behaviors on the material surface during the adsorption and separation process of the trace arsenic were investigated systematically in this thesis. The TiO+₂-pillared montmorillonite and the TiO₂-pillared talcum with high adsorption capacity were prepared by hydrolysis and sol-gel methods respectively. According to the properties and the structure characteristic of the aluminium-magnesium talcum and montmorillonite, the preparation procedure and the pillared material were optimized and the relationship between the structure and the performance of the materials was explored. The interface properties of the pillared materials were characterized by XPS, FT-IR, SRD, TEM, DTA and solid NMR. The effects of the preparation conditions on the structures of the TiO2-pillared montmorillonite and the TiO2-pillared talcum and the deep adsorption of the trace arsenic in the water system were investigated. The adsorption mechanism of the trace arsenic for the TiO2-pillared montmorillonite and the TiO2-pillared talcum with special planar structures and the effects of the external introduction of energy on the enhancement of the adsorption were studied systematically. The experimental results indicate that the ultraviolet radiation can effectively enhance the adsorption of trace arsenic. The...