Evaluation of Cu2+, Co2+ and Ni2+ ions removal from aqueous solution using a novel chitosan/clinoptilolite composite: Kinetics and isotherms
Evaluation of Cu2+, Co2+ and Ni2+ ions removal from aqueous solution using a novel chitosan/clinoptilolite composite: Kinetics and isotherms
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DOI：
10.1016/j.cej.2010.03.029
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发表时间：
2010-05-15
影响因子：
15.1
通讯作者：
Dragan, Ecaterina Stela
中科院分区：
文献类型：
--
作者：
Dinu, Maria Valentina;Dragan, Ecaterina Stela
一种新型的壳聚糖/斜发沸石复合材料，作为平均粒径为800 μ m的颗粒，在干燥状态下，用于去除有毒金属离子，如：Cu ~（2+），Co ~（2+）和Ni ~（2+）从水溶液中的比较研究。考察了溶液初始pH值、接触时间、金属离子初始浓度和温度对复合材料吸附性能的影响。动力学数据进行了分析，伪一级，伪二级，和颗粒内扩散方程。吸附动力学符合准二级动力学方程，吸附等温线符合Langmuir方程。壳聚糖/斜发沸石复合材料对Cu ~（2+）、Co ~（2+）和Ni ~（2+）的最大理论吸附容量分别为11.32、7.94和4.209 mmol/g。吸附吉布斯自由能（Δ G（ads）度）的负值表明所有金属离子在新型复合材料上的吸附的自发性。通过使用0.1M HCl在约20分钟内实现金属离子从复合材料的解吸。（C）2010 Elsevier B. V.保留所有权利。
A novel chitosan/clinoptilolite composite, as beads with an average size of 800 mu m in diameter, in dry state, was used for comparative studies on the removal of toxic metal ions like: Cu2+, Co2+ and Ni2+ from aqueous solutions. The effects of the initial pH value of the solution, contact time, the initial metal ion concentration and temperature on the adsorption capacity of the composite were investigated. The kinetics data were analysed by pseudo-first order, pseudo-second order, and intra-particle diffusion equations. The adsorption kinetics were well described by the pseudo-second order equation, and the adsorption isotherms were better fitted by the Langmuir equation. The maximum theoretical adsorption capacities of the chitosan/clinoptilolite composite for Cu2+, Co2+ and Ni2+ were found to be 11.32, 7.94 and 4.209 mmol/g, respectively. The negative values of Gibbs free energy of adsorption (Delta G(ads)degrees) indicated the spontaneity of the adsorption of all metal ions on the novel composite. Desorption of the metal ions from the composite was achieved by using 0.1 M HCl in about 20 min. (C) 2010 Elsevier B.V. All rights reserved.