酸处理凹凸棒粘土对Cd<sup>2+</sup>吸附性能的研究

酸处理凹凸棒粘土对Cd²⁺吸附性能的研究

摘要: 用不同浓度盐酸活化凹凸棒粘土,考察了酸化凹凸棒粘土对Cd²⁺吸附率的影响。在此基础上,研究了溶液浓度、粘土加入量和悬浮液的pH值等因素对浓盐酸处理凹凸棒粘土吸附Cd²⁺性能的影响。结果表明,随着盐酸浓度的增加,酸处理凹凸棒粘土对Cd^2+的吸附率增大。在Cd²⁺初始浓度为500mg/L、吸附液pH值为8.50、加入量为0.15g和吸附时间3h时,酸处理浓度12 mol/L的凹凸棒粘土对Cd²⁺的吸附率可达86.24%。Cd²⁺的吸附同时符合Langmuir等温式和Freundlich等温式。

Abstract: In this paper,the effects of palygorskite clay with acid-treated of different HCl concentrations on adsorption properties for Cd²⁺ were investigated.On this base,the effects of concentration of Cd²⁺ solution,pH value of adsorption solution and amount clay on adsorption properties of acid-treated palygorskite clay for Cd²⁺ were studied.The results show that adsorption capacities of acid-treated palygorskite clay for Cd²⁺ increase with increasing HCl concentration.In the conditions of amount of palygorskite clay is 0.15g,adsorption time is 3h,pH value of initial adsorption solution is 8.50 and Cd²⁺ concentration of adsorption solution is 500mg/L,the adsorption capacity of 12mol/L HCI treated palygorskite clay for Cd²⁺ reach 86.24%.The adsorptions of Cd²⁺ on palygorskite clay were fitted to both Langmuir and Freundlich models.