Adsorption of Silver(I) from Aqueous Solution by Chelating Resins with 3-Aminopyridine and Hydrophilic Spacer Arms: Equilibrium, Kinetic, Thermodynamic, and Mechanism Studies

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• 作者：Shuhui Song ; Chunnuan Ji ; Min Wang ; Chunrong Wang ; Changmei Sun ; Rongjun Qu ; Chunhua Wang ; Hou Chen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：April 14, 2011
• 年：2011
• 卷：56
• 期：4
• 页码：1001-1008
• 全文大小：908K
• 年卷期：v.56,no.4(April 14, 2011)
• ISSN：1520-5134

文摘

The equilibrium, kinetics, thermodynamics, and mechanism of two novel chelating resins with 3-aminopyridine and hydrophilic spacer arms (denoted as PS-DEG-3-AP and PS-TEG-3-AP) for Ag(I) were investigated in detail. The Boyd, Langmuir, Freundlich, and Dubinin鈭扲adushkevich (D-R) models were applied to describe the adsorption of the resins for Ag(I). The saturated adsorption capacities of PS-DEG-3-AP and PS-TEG-3-AP for Ag(I) were (0.21 and 0.30) mmol路g^鈭? at pH 4, respectively. The results showed that the adsorption processes were governed by film diffusion and followed the pseudo second-order model well. The Langmuir model was better than the Freundlich model to describe the isotherm process. The E values obtained from the D鈭扲 model indicated that the adsorption of Ag(I) ions onto the resins occurred by chemical ion exchange. The adsorption mechanism of the resins for Ag(I) was confirmed by X-ray photoelectron spectroscopy (XPS). The XPS results clarified that not only 3-aminopyridine but also S atoms existed in the spacer arm that could take part in the coordination with Ag(I). Five adsorption鈭抎esorption cycles were conducted for the reuse of the resins. The results indicated that these two resins were suitable for reuse without considerable change in adsorption capacity.