Adsorption properties of congo red from aqueous solution on modified hectorite: Kinetic and thermodynamic studies

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	Adsorption properties of congo red from aqueous solution on modified hectorite: Kinetic and thermodynamic studies
	Xia, Chenglong 1,2; Jing, Yan1 ; Jia, Yongzhong1 ; Yue, Duyuan 1,2; Ma, Jun 1; Yin, Xiaojie 1,2
	2011-01-15
发表期刊	DESALINATION
卷号	265 期号:1-3 页码:81-87
关键词	Anionic Dye Adsorption Modified Hectorite Kinetics Thermodynamics
摘要	Two modified hectorites have been designed and synthesized by two cationic surfactants namely cetyltrimethyl ammonium bromide (CTAB) and octadecylamine (ODA) for selective removal of the anionic dye congo red (CR) from aqueous solution. The adsorbent capacity of modified hectorites was discussed and the optical contents of CTAB and ODA were 35% and 28%, respectively. Modified hectorites were characterized by X-ray powder diffractometer (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The effects of adsorbents content and adsorption temperature on the sorption of CR on modified hectorites were studied. Experimental results showed that the equilibrium adsorption data fitted well with the Langmuir isotherm and the adsorption capacities were 182 and 197 mg/g for the modified cetyltrimethyl ammonium bromide hectorite (CTAB-Hect) and ammonium bromide hectorite (ODA-Hect), respectively. Kinetic studies showed that the dynamical data fitted well with the pseudo-second-order kinetic model. For thermodynamic studies, parameters such as the Gibbs free energy (Delta G(0)), the enthalpy (Delta H(0)) and the entropy (Delta S(0)) indicated that the adsorption process was spontaneous and endothermic in nature. (C) 2010 Elsevier B.V. All rights reserved.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5972
专题	青海盐湖研究所知识仓储盐湖资源综合利用工程技术中心
作者单位	1.Chinese Acad Sci, Inst Salt Lakes, Xining 810008, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100086, Peoples R China
推荐引用方式 GB/T 7714	Xia, Chenglong,Jing, Yan,Jia, Yongzhong,et al. Adsorption properties of congo red from aqueous solution on modified hectorite: Kinetic and thermodynamic studies[J]. DESALINATION,2011,265(1-3):81-87.
APA	Xia, Chenglong,Jing, Yan,Jia, Yongzhong,Yue, Duyuan,Ma, Jun,&Yin, Xiaojie.(2011).Adsorption properties of congo red from aqueous solution on modified hectorite: Kinetic and thermodynamic studies.DESALINATION,265(1-3),81-87.
MLA	Xia, Chenglong,et al."Adsorption properties of congo red from aqueous solution on modified hectorite: Kinetic and thermodynamic studies".DESALINATION 265.1-3(2011):81-87.