Journal
CHEMICAL ENGINEERING JOURNAL
Volume 225, Issue -, Pages 237-244Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.03.088
Keywords
Ethylamine; Montmorillonite; Adsorption; Cesium; Modify
Categories
Funding
- Program for National Science Foundation of China [41273122, 41073058, 40973075]
- Research Fund for the Doctoral Program of Higher Education of China [20100172110028]
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In this study, the adsorption performance of ethylamine-modified montmorillonite (Ethyl-Mt) and calcium-saturated montmorillonite (Ca-Mt) were evaluated by Cs+ adsorption experiments considering the influencing factors (initial solution pH, contact time, initial Cs+ concentration, temperature and ionic strength). FTIR, BET, SEM, EDS and Zeta potential analysis were used to characterize the surface properties of Ethyl-Mt and Ca-Mt. Experimental results demonstrated that the equilibrium uptake of Cs+ was highly pH-dependent. Pseudo-second-order model fitted well with the adsorption kinetic studies. The adsorption processes were described by Langmuir model with maximum adsorption capacity of 60.03 mg g(-1) and 80.27 mg g(-1) for Ca-Mt and Ethyl-Mt, respectively. Also, the thermodynamic studies showed that the adsorption of Cs+ was spontaneous and exothermic in nature. The presence of cations such as Na+, K+, Ca2+ astricted the adsorption of Cs+. The Cs+ removal on Ca-Mt was mainly ion exchange, while that on Ethyl-Mt would also involve coordination and surface complexation. On the basis of our results, Ethyl-Mt with high adsorption capacity and good surface characteristics is beneficial to be used for removal of Cs+. (c) 2013 Elsevier B.V. All rights reserved.
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