Equilibrium,Kinetics and Thermodynamics of the Adsorption of Methylene Blue onto a Metal-Organic Frameworks Material,Copper Coordination Polymer with Dithiooxamide

被引:2
作者
李小娟 [1 ,2 ]
郑玲燕 [2 ]
朱云燕 [1 ]
黄连珠 [2 ]
林振宇 [2 ]
郑欧 [2 ]
机构
[1] College of Environment and Resources,Fuzhou University
[2] MOE Key Laboratory of Analysis and Detection for Food Safety,Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety,Department of Chemistry,Fuzhou University
基金
中国国家自然科学基金;
关键词
metal-organic frameworks(MOFs); adsorption; methylene blue(MB);
D O I
10.19884/j.1672-5220.2014.01.003
中图分类号
X703 [废水的处理与利用]; O647.3 [吸附];
学科分类号
070304 ; 081704 ; 083002 ;
摘要
The equilibrium, kinetics and thermodynamics of the adsorption of methylene blue( MB) from aqueous solution onto copper coordination polymer with dithiooxamide( H2dtoaCu),one of the metal-organic frameworks( MOFs),were investigated in a batch adsorption system as a function of initial pH, adsorbent concentration, contact time, initial dye concentration, and temperature. The Langmuir, Freundlich, and DubininRadushkevich( D-R) isotherm models were used for modeling the adsorption equilibrium. It was found that Langmuir model yielded a much better fit than the Freundlich model under different temperatures. The maximum monolayer adsorption capacities of MB were 192. 98,229. 86,and 297. 38 mg /g at 298,308,and 318 K,respectively. The calculated mean adsorption energy( 8. 26-11. 04 kJ /mol) using D-R model indicated that the adsorption process might take place by chemical adsorption mechanism.Otherwise,the kinetic studies revealed that the adsorption process could be well explained by pseudo-second-order rate kinetics and intraparticle diffusion was not the rate-limiting step.Thermodynamic studies indicated that this system was feasible,spontaneous,and endothermic process. Based on these studies,H2dtoaCu can be considered as a potential adsorbent for the removal of MB from aqueous solution.
引用
收藏
页码:10 / 17
页数:8
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