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Studies on Adsorption Properties of Chromium(Ⅵ) on the Nanometer size TiO 2 Powders Surfaces Using On line Flow injection Analysis

MA Wan Hong, CAI Ru Xiu *, LIN Zhi Xin (College of Chemistry, Wuhan University, Wuhan, 430072)  
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 ).
【Fund】: 国家自然科学基金
【CateGory Index】: O657.32,O647.3
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