摘要
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.
出处
《化工环保》
CAS
CSCD
北大核心
2006年第6期459-462,共4页
Environmental Protection of Chemical Industry
基金
国家自然科学基金资助项目(10475038)
湖南省自然科学基金资助项目(05JJ30094)
关键词
黏土
铀
吸附
废水处理
clay
uranium
adsorption
wastewater treatment