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膨润土对溶液中镍离子的吸附特性及机理
作者:曹晓强1 张燕1 邱俊1 吕宪俊1 王立和2 陈亚男1 王燕华1 
单位:1.山东科技大学化学与环境工程学院 山东青岛266590  2.辛辛那提大学工程与应用科学学院 辛辛那提45221  美国 
关键词:膨润土  吸附 重金属 机理 
分类号:TQ424.24
出版年,卷(期):页码:2014,42(11):1448-1454
DOI:10.7521/j.issn.0454-5648.2014.11.16
摘要:

 研究了膨润土对Ni2+的吸附动力学和吸附热力学,并对吸附机理进行了分析。结果表明:膨润土对Ni2+的吸附符合准2级动力学模型,吸附速率受颗粒内扩散和膜扩散机制共同影响;膨润土对Ni2+的吸附符合Langmuir等温方程,吸附过程是一个自发的吸热反应。吸附过程中溶液中的Na+、K+、Ca2+、Mg2+的浓度明显上升,说明离子交换属于去除机制之一;主要吸附机制是离子交换和外表面络合。

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 The kinetics, thermodynamics and mechanisms of Ni2+by bentonites were investigated.The adsorption mechanism w as also analyzed.The results show that the adsorption kinetics follows the pseudo­second­orderkinetic model.The adsorption rate is effected by both particle and film diffusions.The adsorption process can be described by the Langmuir models.Based on the analysis of thermodynamic parameters, the adsorption processes belongs to an endothermic reactions.The concentration of Na+,K+,Ca2+,Mg2+in the solution increase significantly after the adsorption by bentonite.It is assumed that the ion exchange could be one of the ion removal mechanisms besides the outer­sphere surface complexation.

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基金项目:
基金项目:国家自然科学基金(51204104, 50774050);山东省优秀中青年科学家科研奖励基金(BS2012CL026; BS2013CL001);山东省博士后创新项目专项资金(201202028);山东省自然科学基金(ZR2011EEM022);中国博士后科学基金(2012M521367);山东科技大学科研创新团队支持计划(2012KYTD102)资助.
作者简介:
第一作者:曹晓强(1980—),男,博士,副教授.
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