摘要
主要研究了蒙脱石吸附胡敏酸后形成的复合体对Cu2+、Cd2+、Cr3+3种重金属离子的吸附。实验结果表明:用胡敏酸对蒙脱石改性后能提高其对3种重金属离子的吸附性能,胡敏酸浓度越大,吸附性能提高程度越大,3种重金属离子的Langmuir吸附等温线线性相关都能达到0.99以上。蒙脱石/胡敏酸复合体对3种重金属离子的吸附量都随pH值的升高而增加,随离子强度的增加而减小。另外还对其吸附动力学进行了研究,发现可用Elovicb方程和双常数方程对吸附过程进行较好地拟合。
This paper studied the absorption of three kinds of heavy metal ions (Cu^2+ , Cd^2+ , Cr^3+ ) on montmorillonite/humic acid complexes, The result shows that the montmorillonite absorbed humic acid can improve the absorption capacity of three heavy metal ions, and the improvement is increasingly remarkable with the rising concentration of absorbed humic acid. The Langmuir constants of adsorption isotherm can reach over 0.99. The adsorption amount of the three kinds of heavy metal ions increases with the rise of pH, but the adsorption amount decreases with ionic strength. Based on an investigation into kinetic characteristics of the three kinds of heavy metal ions on montmorillonite/humic acid complexes, the authors have found that the Elovicb equation and the two constant equation can describe the kinetic characteristics very well.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2008年第3期221-226,共6页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目(40573064
40202007)
广东省自然科学基金资助项目(06025666
04020017)
广东省科技计划项目(2006B36601004)
教育部新世纪优秀人才支持计划(NCET-06-0747)
华南理工大学SRP资助项目
关键词
吸附
蒙脱石
重金属
胡敏酸
动力学
adsorption
montmorillonite
heavy metal
humic acid
kinetics