Ding Z, Zhu HY, Lu GQ, Greenfield PF
Department of Chemical Engineering, The University of Queensland, Brisbane, Qld 4072, Australia
J Colloid Interface Sci. 1999 Jan 1;209(1):193-199. doi: 10.1006/jcis.1998.5857.
Photocatalysts based on titania pillared clays (TiO2 PILCs) have been prepared through a sol-gel method. Different drying methods, air drying (AD), air drying after ethanol extraction (EAD), and supercritical drying (SCD) have been employed and found to have significant effects on the photocatalytic efficiency of the resultant catalysts for the oxidation of phenol in water. Titania pillared clay (TiO2 PILC) obtained by SCD has the highest external and micropore surface area, largest amount and smallest crystallite size of anatase, and exhibited the highest photocatalytic activity. Furthermore, silica titania pillared clay (SiO2-TiO2 PILC) after SCD, titania coated TiO2 PILC (SCD) and SiO2-TiO2 PILC (SCD) were synthesized to study the key factors controlling the photocatalytic activity. It is concluded that the dispersion of nanometer-sized anatase on the surface of the PILC particles and the suspensibility of the particles are the most important factors for high photocatalytic efficiency. Copyright 1999 Academic Press.
基于二氧化钛柱撑黏土（TiO₂ PILCs）的光催化剂已通过溶胶-凝胶法制备。采用了不同的干燥方法，即空气干燥（AD）、乙醇萃取后空气干燥（EAD）和超临界干燥（SCD），发现这些方法对所得催化剂光催化氧化水中苯酚的效率有显著影响。通过超临界干燥获得的二氧化钛柱撑黏土（TiO₂ PILC）具有最高的外表面积和微孔表面积、最大数量且最小晶粒尺寸的锐钛矿，并且表现出最高的光催化活性。此外，合成了超临界干燥后的二氧化硅-二氧化钛柱撑黏土（SiO₂-TiO₂ PILC）、二氧化钛包覆的TiO₂ PILC（SCD）和SiO₂-TiO₂ PILC（SCD），以研究控制光催化活性的关键因素。得出的结论是，纳米级锐钛矿在柱撑黏土颗粒表面的分散以及颗粒的悬浮性是高光催化效率的最重要因素。版权所有1999年学术出版社。
