黏土对废水中铀的吸附性能

Adsorption of Uranium in Wastewater on Clay

用黏土吸附废水中的铀,考察了黏土对废水中铀的吸附性能、影响因素及黏土对铀的吸附动力学。实验结果表明,在含铀废水pH为5、铀初始质量浓度为20mg/L、黏土加入量为5g/L的条件下,振荡吸附1h后的吸附率达75.4%;黏土粒径越小,对铀的吸附量越大,粒径为0.20mm时的吸附量最高(3.24mg/g);溶液中铀初始质量浓度与铀的吸附率成反比,与铀的吸附量成正比;黏土对铀的吸附符合Freundlich和Langmuir吸附等温式,饱和吸附量达18.25mg/g;黏土对铀的吸附过程用Ho准二级反应动力学方程描述更合适。

Uranium in wastewater was adsorbed using clay. The adsorption capability of clay for uranium,influencing factors and adsorption kinetics were explored. The experimental results indicate that：When wastewater pH is 5, the initial mass concentration of uranium is 20 mg/L and the dosage of clay is 5 g/L,the adsorption efficiency can reach 75.4% after shake adsorption for 1 h;The smaller the particle diameter of clay is, the larger the adsorption quantity is, and the maximum adsorption quantity is 3.24 mg/g when the particle diameter of clay is 0.2 mm; The increasing of initial uranium mass concentration results in the decreasing of adsorption efficiency and the increasing of adsorption quantity; The adsorption behavior accords with both Freundlich and Langmuir isotherms with 18. 25 mg/g of adsorption capacity ,and the Ho pseudo-second-order kinetic equation is more appropriate for it.