纳米TiO2的水解制备及吸附性能

Preparation of Nanocrystalline TiO2 by Hydrolysis Method and Adsorption Properties

摘要:

以硫酸钛为前驱体，水解法制备纳米TiO2，用XRD、SEM、BET等手段进行表征。考察了制备方法、硫酸钛浓度、水解温度、干燥温度、分散剂PVA浓度及搅拌作用对纳米二氧化钛吸附As(Ⅴ)的影响，得到水解法制备纳米TiO2的最佳条件，并进一步考察了As(Ⅴ)溶液pH值、吸附动力学和初始浓度对纳米TiO2吸附性能的影响。结果表明，水解温度为80℃、煅烧温度100℃、硫酸钛浓度为0.2mol•L-1、pH 6.0，初始As(Ⅴ)100mg•L-1时纳米TiO2颗粒物对As(Ⅴ)的吸附量可达到89.28mg•g-1。XRD衍射表明所制备的TiO2为锐钛矿型，SEM表明其平均粒径小于20nm，BET表明比表面积为167 m2/g。

Abstract:

Nanometer titania has been prepared by hydrolysis of titanium(Ⅳ) sulfate(Ti(SO4)2), and the product was characterized by XRD, SEM and BET. Effects of synthesis methods, titanium(Ⅳ) sulfate concentration, hydrolysis temperature, desiccation temperature, addition of dispersant PVA and strring on adsorption behavior of TiO2 were investigated，and the optimum TiO2 synthesized condition was obtained. In addition, influences of pH value of As(Ⅴ)solution, adsorption kinetics and initial As(Ⅴ)concentration on arsenate adsorption by TiO2 were studied. Results suggested that adsorption capacity of As(Ⅴ) by TiO2 approached 89.28mg•g-1 at the condition of 80℃hydrolysis temperature, 100℃desiccation temperature, 0.2mol/L titanium(Ⅳ) sulfate concentration, pH 6.0 and 100mg•L -1As(Ⅴ)initial concentration. It was found that anatase nanometer tatania was formed by XRD, the mean particle size of nanocrystalline TiO2 was less than 20nm by SEM, and the specific surface area was 167 m2/g by BET.