Abstract: To improve the stability of TiO₂ nano-particles, using the acid leaching residue of asbestos tailings as the carrier and TiCl₄ as the precursor, the nano-sized TiO₂-acid leaching residue of asbestos tailings composites were prepared by the method of hydrolysis deposition. The effects of mass ratio of water and acid leaching residue， pH value of the reaction solution and reaction time on the photocatalytic activity of the composites were investigated through the degradation of rhodamine B. The composites were characterized by means of XRD and SEM. The results indicate that the optimal conditions are obtained that the mass ratio of water and acid leaching residue is 30:1, pH is 6 and reaction time is 3 h. Under the optimal conditions, the degradation rate of rhodamine B is 90.5% by the composites after being calcined at 800 ℃ for 2 h. The composites show loose and porous morphology and the average grain size of TiO₂ nano-particles is 20.9 nm.

Keywords: TiO₂ nano-particles; asbestos tailings; acid leaching residue; photocatalysis

中图分类号：TB332          文献标志码：A

文章编号：1008-5548(2014)03-0056-04

DOI:10.13732/j.issn.1008-5548.2014.03.013

收稿日期：2013-10-30， 修回日期：2013-11-11，在线出版时间：2014-06-24。

第一作者简介：孙青（1987—），男，博士研究生，研究方向为矿物材料及资源综合利用。 E-mail：ianymail@163.com。

通信作者简介：郑水林（1956—），男，教授，博士生导师，研究方向为资源综合利用与非金属矿深加工、粉体加工与矿物材料制备技术。E-mail：shuilinzh@sina.com。