Use of a selective extractant-impregnated resin for removal of Pb(II) ion from waters and wastewaters: Kinetics, equilibrium and thermodynamic study

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• 作者：Ahmad Hosseini-Bandegharaei^a ; ^{ahoseinib@yahoo.com" class="auth_mail} ; ^{ahoseinib@iaukashmar.ac.ir" class="auth_mail} ; Mohammad Karimzadeh^b ; Masoud Sarwghadi^a ; Aliasghar Heydarbeigi^a ; Seyyed Hossein Hosseini^a ; Mehdi Nedaie^a ; Hassan Shoghi^a
• 关键词：Extractant-impregnated resins ; Pb(II) adsorption ; Gallocyanine ; Amberlite XAD-16 ; Equilibrium study ; Kinetic study
• 刊名：Chemical Engineering Research and Design
• 出版年：March, 2014
• 年：2014
• 卷：92
• 期：3
• 页码：581-591
• 全文大小：1457 K

文摘

Adsorption of Pb(II) ion by a novel extractant-impregnated resin, EIR, was studied as a function of various experimental parameters using batch adsorption experiments. The new EIR was prepared by impregnating gallocyanine (GCN) onto Amberlite XAD-16 resin beads. The EIR was characterized by nitrogen analysis and SEM micrographs. The new EIR showed excellent selectivity factor values (伪) for Pb(II) adsorption respect to other metal ions. The effects of some chemical and physical variables were evaluated and the optimum conditions were found for Pb(II) removal from aqueous solutions. The equilibrium adsorption isotherm was fitted with the Langmuir adsorption model. The maximum adsorption capacity (q_max) of EIR for Pb(II) ions was found to be 367.92 mg g^鈭?. The kinetic studies showed that the intra-particle diffusion is the rate-controlling step. Also, the intra-particle diffusion coefficients, D_ip values, were of the order of 10^鈭?2 m² s^鈭?. The values of enthalpy (螖H掳) were positive, which confirms the endothermic nature of adsorption process. Also, the positive entropy changes (螖S掳) were showed that the randomness increased along with the adsorption process. In addition, the obtained negative values of Gibbs free energy (螖G掳) indicated feasible and spontaneous nature of the adsorption process at different temperatures. The new adsorbent was very stable so that it can be successfully used for many consecutive cycles without significant loss in its adsorption capacity.