Comparative adsorption of Cu(II), Zn(II), and Pb(II) ions in aqueous solution on the crosslinked chitosan with epichlorohydrin
Comparative adsorption of Cu(II), Zn(II), and Pb(II) ions in aqueous solution on the crosslinked chitosan with epichlorohydrin
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DOI：
10.1016/j.jhazmat.2007.10.009
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发表时间：
2008-06-15
影响因子：
13.6
通讯作者：
Chen, Chia-Yun
中科院分区：
文献类型：
--
作者：
Chen, Arh-Hwang;Liu, Sheng-Chang;Chen, Chia-Yun
利用壳聚糖在乙酸水溶液中与环氧氯丙烷均相反应制备交联壳聚糖，研究了交联壳聚糖对水溶液中Cu（II）、Zn（II）、Pb（II）3种金属离子的吸附性能。采用核磁共振（CNMR）-C-13、扫描电镜（SEM）和元素分析等手段对交联壳聚糖进行了表征，并研究了pH和阴离子对吸附性能的影响。动力学研究表明，吸附过程符合二级动力学方程。结果表明，在所研究的浓度范围内，Langmuir、Freundlich和Dubinnin-Radushkevich吸附等温方程均能较好地拟合Langmuir吸附等温方程。吸附容量（Q（m））的大小顺序为：Cu ~（2+）> Pb ~（2+）> Zn ~（2+）。在乙酸水溶液中通过均相反应合成了交联壳聚糖与环氧氯丙烷的方法。结果表明，交联壳聚糖对水溶液中3种金属离子的吸附是通过物理吸附现象实现的。(c)2007 Elsevier B. V.保留所有权利。
The crosslinked chitosans synthesized by the homogeneous reaction of chitosan in aqueous acetic acid solution with epichlorohydrin were used to investigate the adsorptions of three metals of Cu(II), Zn(II), and Pb(II) ions in an aqueous solution. The crosslinked chitosan characterized by (CNMR)-C-13, SEM, and elemental analysis, and the effects of pH and anion on the adsorption capacity were carried out. The dynamical study demonstrated that the adsorption process was followed the second-order kinetic equation. The results obtained from the equilibrium isotherms adsorption studies of three metals of Cu(II), Zn(II), and Pb(II) ions by being analyzed in three adsorption models, namely, Langmuir, Freundlich, and Dubinnin-Radushkevich isotherm equations, indicated to be well fitted to the Langmuir isotherm equation under the concentration range studied, by comparing the linear correlation coefficients. The order of the adsorption capacity (Q(m)) for three metal ions was as follows: Cu2+ > Pb2+ > Zn2+. This technique for syntheses of the crosslinked chitosans with epichlorohydrin via the homogeneous reaction in aqueous acetic acid solution showed that the adsorptions of three metal ions in aqueous solution were followed the monolayer coverage of the adsorbents through physical adsorption phenomena. (c) 2007 Elsevier B.V. All rights reserved.