酸处理凹凸棒粘土对Cd^(2+)吸附性能的研究

STUDY ON ADSORPTION PROPERTIES OF ACID-TREATED PALYGORSKITE CLAYS FOR Cd^(2+)

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Cd2+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。

In this paper, the effects of palygorskite clay with acid--treated of different HCI concentra- tions on adsorption properties for Cd^2＋ were investigated. On this base, the effects of concentration of Cd^2＋ solution, pH value of adsorption solution and amount clay on adsorption properties of acid--treated palygorskite clay for Cd^2＋ were studied. The results show that adsorption capacities of acid--treated palygorskite clay for Cd^2＋ increase with increasing HCI 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 Cd^2＋ concentration of ad- sorption solution is 500mg/L, the adsorption capacity of 12mol/L HCI treated palygorskite clay for Cd^2＋ reach 86.24%. The adsorptions of Cd^2＋ on palygorskite clay were fitted to both Langmuir and Freundlich models.