摘要
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．
Various of nanometer size TiO 2 samples are prepared from TiCl 4 under different hydrolysis and calcining treatment conditions, such as pH, surfactants, stabilizers and temperature. It has been found that powders heat treated at the temperature below 450 ℃ are of anatase crystal structure with average grain size of less than 20 nm. Adsorption behavior of Cr(Ⅵ) ion on as prepared powders, adsorption kinetics, pH curves, adsorption isotherms and adsorption capacity are studied by flow injection micro column system for preconcentration using spectrophotometric detection method. The results demonstrated that nanometer size TiO 2 possesses a significant capacity and exchange rate for adsorption of Cr(Ⅵ) ion(approximately 3 080 μg/g and 8 6×10 3 s -1 ).
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第10期1566-1569,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
吸附动力学
铬
纳米级
流动注射分析
二氧化钛
Nanometer size TiO 2
Adsorption kinetics properties
Chromium(Ⅵ)
On line flow injection analysis
