锐钛型纳米二氧化钛去除水中Cu(Ⅱ)的研究

Study on the removal of Cu(Ⅱ) in aqueous solution by anatase nano-titania

采用TiCl4液相水解法制备锐钛型纳米TiO2,用XRD、SEM、TEM对粉体进行表征。在避光/紫外光照射条件下将自制纳米TiO2用于处理水中Cu2+。考察了处理时间、pH值、有机物和共存阳离子等因素对去除率的影响。结果表明:纳米TiO2量为1g.L-1、溶液pH值为6、Cu2+初始浓度10mg.L-1,去除时间分别为20min和120min时,Cu2+的最大去除率分别为54.4%和68.2%。另外,在紫外光照射条件下,还原性有机物(甲酸、甲醛、甲醇)可不同程度地提高Cu2+的光催化还原率,但对Cu2+的吸附有抑制作用。共存阳离子对去除率影响存在较大差异。

The anatase nano -titania was prepared by the liquid phase hydrolysis of TiCl4 and was characterized by XRD, SEM and TEM, respectively. The nano - titaniawas utilized to remove Cu^2＋ in the aqueous solution in/under darkness and UV - illumination. The removal efficiency of Cu^2＋ was affected by pH value, removal time, UV - illumination, organics （formic acid, formaldehyde and methanol） and the coexisting cation in the solution. The in- vestigation showed that the highest removal efficiency of Cu^2 ＋ by nano - titania were 54.4% and 68.2%, respectively, under the following experimental conditions ： a pH value of 6, a quantitive nano - titaniaof 1 g · L^- 1, an initial concentration of copper ions of 10 mg · L^-1, the removal time of 20/120 minutes. In addition, the removal efficiency of Cu^2＋ was improved by reductive organics under UV - illumination but decreased in darkness. The different effect on removal Cu^2＋ was made by different coexisting anions in the solution.