Removal of Pb2+ from aqueous solutions by a high-efficiency resin

• Published in: Applied surface science Vol. 283; pp. 660 - 667
• Main Authors: Guo, Hao, Ren, Yongzheng, Sun, Xueliang, Xu, Yadi, Li, Xuemei, Zhang, Tiancheng, Kang, Jianxiong, Liu, Dongqi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.10.2013; Elsevier
• Subjects: Aqueous solutions; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Equilibrium; Exact sciences and technology; Ion exchangers; Ion-exchange; Kinetic; Mathematical models; Pb2; Physics; Polymers; Regeneration; Resins; Sodium; Sorption; Wastewater; Pb2; Ion-exchange; Kinetic; Wastewater; Equilibrium; Pb; Aqueous solutions; Kinetics; Ion exchange
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.06.161

•A high efficiency and low cost resin were used for lead removal.•The resin showed outstanding adsorption capacity for lead.•Both synthetic solution and acid battery effluent were employed in column test.•NaOH gave a perfect performance on the generation of resin. The removal of Pb2+ from aqueous solution by 732 cation-exchange resin in sodium type (732-CR) has been studied in batch experiments at varying pH (2.0–8.0), Pb2+ concentration (50–200mg/L), contact time (5–300min), temperature (288–308K) and resin dose (0.125–0.75g/L). The experimental data show that the ion-exchange process was dependent on pH and temperature, the optimal exchange capacity was found at pH 4.0, and higher temperature was beneficial to lead sorption. Kinetic data indicate that the ion-exchange process followed a pseudo-first order model. The equilibrium exchange capacity could be reached at approximately 4h, and the maximum sorption capacity of Pb2+ at pH 4.0 was 396.8mg/g resin. The equilibrium data were evaluated with Langmuir and Freundlich model, and were best fitted with Langmuir model. The thermodynamic parameters for removal of Pb2+ indicate that the reaction was spontaneous and endothermic. Additionally, column tests were conducted by using both synthetic solution and effluents from lead battery industry. The regeneration of resin was performed for two sorption-regeneration cycles by 1M NaOH, and the results show that effective regeneration was achieved by this method.