Recovery of gold(III) and silver(I) on a chemically modified chitosan with magnetic properties
Recovery of gold(III) and silver(I) on a chemically modified chitosan with magnetic properties
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DOI：
10.1016/j.hydromet.2007.03.007
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发表时间：
2007-07-01
期刊：
影响因子：
4.7
通讯作者：
Elwakeel, Khalid Z.
中科院分区：
文献类型：
--
作者：
Donia, Ahmed M.;Atia, Asem A.;Elwakeel, Khalid Z.
制备了具有磁性的化学改性壳聚糖树脂。改性过程是通过壳聚糖与硫脲/戊二醛聚合席夫碱在磁铁矿存在下的反应进行的。用分批法和柱法对所得树脂从其水溶液中回收Au（III）和Ag（I）进行了试验。据报道，Au（III）和Ag（I）的吸收值分别为3.6和2.1 mmol/g。获得了吸附过程的动力学和热力学参数。结果表明，吸附过程为自发放热反应，动力学符合准二级动力学模型。金属离子与活性中心的相互作用机理被解释为金（III）的离子对和银（I）的螯合作用。通过柱研究估计了树脂的穿透时间、临界床高度和耐久性。这些参数表明该树脂对Au（III）和Ag（I）具有良好的效率。(c)2007 Elsevier B. V.保留所有权利。
Chemically modified chitosan resin with magnetic properties has been prepared and investigated. The modification process took place through the reaction between chitosan and polymeric Schiff's base of thiourea/glutaraldehyde in the presence of magnetite. The resin obtained was tested for the recovery of Au(III) and Ag(I) from their aqueous solutions using batch and column methods. Uptake values of 3.6 and 2.1 mmol/g were reported for Au(III) and Ag(I), respectively. Both kinetics and thermodynamic parameters of the adsorption process were obtained. The data indicated that adsorption process is exothermic spontaneous reaction and kinetically proceeds according to pseudo second order model. The interaction mechanism between metal ion and active sites has been interpreted as ion pair for gold(III) and chelation for silver(I). Breakthrough time, critical bed height and durability of resin were estimated from column studies. These parameters indicated that the resin has a good efficiency towards Au(III) and Ag(I). (c) 2007 Elsevier B.V. All rights reserved.