环境保护科学2016，Vol.42Issue(6)：68-74,7.DOI:10.16803/j.cnki.issn.1004-6216.2016.06.013
改性栗壳吸附重金属离子的动力学及热力学研究
Study of Dynamics and Thermodynamics of Competitive Adsorption of Heavy Metal Ions by Modified Chestnut Shell
摘要
Abstract
In this paper,dynamics and thermodynamics of the mixed adsorption of Cr(Ⅵ),Cu(Ⅱ) and Ni(Ⅱ) by modified chestnut shell was studied.The results showed that antagonism competition relation existed among Cr(Ⅵ),Cu(Ⅱ) and Ni(Ⅱ) when the ions were absorbed onto the modified chestnut shell,with the order in competitive adsorption of Cu(Ⅱ)＜ Ni(Ⅱ)＜Cr(Ⅵ).In comparison to the separate adsorption process,when the mixed adsorption reached equilibrium,the removal rate of the three ions in the mixed adsorption declined.The removal rate of Cr (Ⅵ) decreased by 20.2％ and that of Cu (Ⅱ) and Ni (Ⅱ) decreased by 40.7％ and 35.6％ respectively.The quasi secondary dynamic equation described well the separate and mixed adsorption of Cr (Ⅵ),Cu (Ⅱ) and Ni (Ⅱ) on the modified chestnut shell,indicating that the three heavy metal ions on the surface of modified chestnut shell were given priority to chemical adsorption.Data from the thermodynamics research showed that the adsorption of Cr (Ⅵ) on modified chestnut shell was endothermic reaction,while that of Cu (Ⅱ) and Ni (Ⅱ) was exothermic reaction.关键词
改性板栗壳/吸附/重金属/动力学/热力学Key words
Modified Chestnut Shell/Adsorption/Heavy Metal/Dynamics/Thermodynamics分类
资源环境引用本文复制引用
徐进栋,季聪,冯凡,吕瑞阳,田园,陈晨..改性栗壳吸附重金属离子的动力学及热力学研究[J].环境保护科学,2016,42(6):68-74,7.基金项目
江苏科技大学2014年研究生科研实践计划(YSJ14S-20)基金资助 （YSJ14S-20）
