海泡石比表面积大、孔隙率高,且表面具有一定量的硅羟基基团,这可为其负载金属氧化物如TiO2、ZnO、Fe2O3等提供更多的活性位点,因而它可以作为一种有效载体来制备具有较好吸附性和催化性的复合材料.主要介绍了海泡石基金属氧化物复合材料的不同制备方法,如溶胶-凝胶法、沉淀法、浸渍法;概述了其在提高比表面积、孔容积以及吸附性能等方面具有的优势;并综述了其在液相和气相光催化领域中的应用;介绍了其光催化性能的影响因素及最佳降解效果;最后对其作为生态环境材料的应用进行了前景展望.
Sepiolite possesses huge specific surface area, high porosity and a certain number of silicon hydroxyl groups on its surface.These groups provide more active sites for the combination of sepiolite with metal-oxides such as TiO2, ZnO, Fe2O3 and so on.Therefore, silicate can be used as an attractive carrier for the composites with favorable adsorbability and catalysis.This paper mainly introduces different preparation methods of sepiolite-based metal oxide compounds such as sol-gel, precipitation, impregnation methods.The unique advantages such as improvement of specific surface area, pore volume and adsorptive capability are discussed.Furthermore, the application of sepiolite-based metal oxide compounds in liquid-phase and gas-phase photocatalysis area are reviewed, and the best degradation effect of these materials and some factors affecting the photocatalytic performance are introduced.Finally, a future development prospect for sepiolite-based metal oxide compounds as an ecological environment material is proposed.
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