磁性海泡石吸附Cr(Ⅵ)特性及动力学  

Adsorption kinetics and features of Cr(Ⅵ) onto magnetically modified sepiolite

作　　者：贾明畅[1,2] 戴友芝[1] 杜婷[1] 刘坚[1] 余铁萍[1] 

机构地区：[1]湘潭大学环境科学与工程系,重金属污染控制湖南省高校重点实验室,湘潭411105 [2]承德石油高等专科学校,承德067000

出　　处：《环境工程学报》2012年第10期3465-3469,共5页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2010ZX07212-008);湖南省科学技术厅科技计划重点项目(2011SK2016)

摘　　要：采用化学共沉淀法合成磁性海泡石,通过静态吸附实验研究磁性海泡石对Cr(Ⅵ)的吸附特性及其动力学。结果表明,磁性海泡石对Cr(Ⅵ)的吸附在90 min内即可达到平衡;体系的初始pH是影响磁性海泡石吸附Cr(Ⅵ)性能的重要因素;当废水中Cr(Ⅵ)的初始浓度为50 mg/L时,磁性海泡石的适宜投加量为10 g/L;随反应温度的升高,磁性海泡石对Cr(Ⅵ)的吸附量增加;温度为25、35和45℃时,磁性海泡石对Cr(Ⅵ)的饱和吸附量分别为3.32、3.72、4.08 mg/g;吸附动力学曲线可以用拟二级反应动力学模型拟合;内扩散和液膜扩散联合控制Cr(Ⅵ)在磁性海泡石上的吸附过程,其中内扩散的控速作用大于液膜扩散。The adsorption kinetics and features of Cr（Ⅵ） onto magnetically modified sepiolite were investigated by static adsorption experiments.The chemical precipitation process was applied to accomplish the modification of sepiolite.The results indicated that the equilibrium was reached in 90 min;the initial pH affected the adsorption capacity of Cr（Ⅵ） significantly;and the appropriate dosing quantity of magnetically modified sepiolite was 10 g/L as Cr（Ⅵ） initial concentration was 50 mg/L.The adsorption amount increased with enhancing of reaction temperature,the saturated extent of adsorption were 3.32,3.72 and 4.08 mg/g,respectively,at 25,35 and 45℃.The pseudo-second-order rate model models were used to describe the kinetic curve of the adsorption of Cr（Ⅵ） onto magnetically modified sepiolite.The intraparticle diffusion,combined with the liquid film diffusion,controlled the adsorption process of Cr（Ⅵ） and played a more important role in the adsorption.

关 键 词：海泡石 磁性 Cr(Ⅵ) 动力学 

分 类 号：X703[环境科学与工程—环境工程]