Removal of Pb 2+ from aqueous solutions by a high-efficiency resin

Hao Guo, Yongzheng Ren, Xueliang Sun, Yadi Xu, Xuemei Li, Tiancheng Zhang, Jianxiong Kang, Dongqi Liu

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The removal of Pb 2+ 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), Pb 2+ concentration (50-200 mg/L), contact time (5-300 min), temperature (288-308 K) and resin dose (0.125-0.75 g/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 4 h, and the maximum sorption capacity of Pb 2+ at pH 4.0 was 396.8 mg/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 Pb 2+ 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 1 M NaOH, and the results show that effective regeneration was achieved by this method.

Original languageEnglish (US)
Pages (from-to)660-667
Number of pages8
JournalApplied Surface Science
Volume283
DOIs
StatePublished - Oct 15 2013

Keywords

  • Equilibrium
  • Ion-exchange
  • Kinetic
  • Wastewater

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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