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用溶胶－凝聚法在不同的水解和热处理条件下制备了纳米尺寸的ＴｉＯ２微粉，所得的ＴｉＯ２表面性质迥异，粒径从几个纳米到数百个纳米，晶型也由低温煅烧的锐钛型转成高温处理时的金红石型．利用流动注射微柱富集在线分析方法对Ｃｒ（Ⅵ）离子在纳米ＴｉＯ２表面上的吸附动力学特性进行了原位表征．
The nano-sized TiO2 powders were prepared by sol-coacervation under different conditions of hydrolysis and heat treatment. The surface properties of the obtained TiO2 were very different from several nanometers to hundreds of nanometers in size. The crystalline forms were also characterized by low-temperature calcined anatase Rutile into high temperature treatment. The in-situ characterization of the adsorption kinetics of Cr (Ⅵ) ions on the surface of nano-TiO2 was performed by means of on-line flow injection micro-column enrichment analysis.