Adsorption and desorption of Cu(II), Cd(II) and Pb(II) ions using chitosan crosslinked with epichlorohydrin-triphosphate as the adsorbent
Adsorption and desorption of Cu(II), Cd(II) and Pb(II) ions using chitosan crosslinked with epichlorohydrin-triphosphate as the adsorbent
复制标题
DOI：
10.1016/j.jhazmat.2010.07.016
复制
发表时间：
2010-11-15
影响因子：
13.6
通讯作者：
Favere, Valfredo T.
中科院分区：
文献类型：
--
作者：
Laus, Rogerio;Costa, Thiago G.;Favere, Valfredo T.
在本研究中，壳聚糖(CTS)分别与环氧氯丙烷(ECH)和三磷酸(TPP)进行共价和离子交联。用CHN分析、EDS对所合成的新型CTS-ECH-TPP吸附剂进行了表征。用红外光谱、热重分析和差示扫描量热法研究了铜、镉、铅在水溶液中的吸附和解吸行为。还进行了电位测量研究，发现每个pK(D)值为5.14、6.76和9.08的三个可滴定质子。结果表明，吸附铜(II)的最佳pH值为6.0，吸附Cd(II)的最佳pH值为7.0，吸附铅(II)的最佳pH值为5.0。动力学研究表明，吸附过程符合准二级模型。用Langmuir、Freundlich和Dubinin-Radushkevich等温线模型对吸附平衡数据进行了分析。该树脂对铜、镉、铅的最大吸附容量分别为130.72、83.75和166.94 mg g(-1)。解吸研究表明，HNO3和HCI是从交联壳聚糖中解吸铜、镉、铅的最佳洗脱剂。(C)2010爱思唯尔B.V.保留所有权利。
In this study, chitosan (CTS) was crosslinked with both epichlorohydrin (ECH) and triphosphate (TPP), by covalent and ionic crosslinking, respectively. The resulting new CTS-ECH-TPP adsorbent was characterized by CHN analysis, EDS. FTIR spectroscopy, TGA and DSC, and the adsorption and desorption of Cu(II), Cd(II) and Pb(II) ions in aqueous solution were investigated. Potentiometric studies were also performed and revealed three titratable protons for each pK(d) value of 5.14, 6.76 and 9.08. The results obtained showed that the optimum pH values for adsorption were 6.0 for Cu(II), 7.0 for Cd(II) and 5.0 for Pb(II). The kinetics study demonstrated that the adsorption process proceeded according to the pseudo-second-order model. Three isotherm models (Langmuir, Freundlich and Dubinin-Radushkevich) were employed in the analysis of the adsorption equilibrium data. The Langmuir model resulted in the best fit and the new adsorbent had maximum adsorption capacities for Cu(II), Cd(II) and Pb(II) ions of 130.72, 83.75 and 166.94 mg g(-1) respectively. Desorption studies revealed that HNO3 and HCI were the best eluents for desorption of Cu(II), Cd(II) and Pb(II) ions from the crosslinked chitosan. (C) 2010 Elsevier B.V. All rights reserved.