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Effect of preparation methods on La3+ adsorption properties of GO/P(NIPAM-MA) hydrogels

YANG Xinwei1,2 SHAN Guorong1,2 CAO Zhihai3 LYU Ting4 PAN Pengju1,2

(1.State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, China 310027)
(2.Institute of Zhejiang University-Quzhou, Quzhou, Zhejiang, China 324000)
(3.Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China 310018)
(4.College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang, China 310018)

【Abstract】Graphene oxide/poly(N-isopropylacrylamide-maleic acid)[GO/P(NIPAM-MA)] hydrogel was prepared by freeze polymerization and non-freeze polymerization, and the preparation methods were compared in terms of the La3+ adsorption capacity of GO/P(NIPAM-MA) hydrogel. It is found that the hydrogel synthesized by the freeze polymerization method has an excellent swelling-shrinking and adsorption properties. With an equivalent molar ratio of 10:1 for NIPAM:MA and 370 mg/L of LaCl3 solution, the equilibrium adsorption capacity of the hydrogel synthesized by the freeze polymerization method is (29.87 ± 0.073) mg/g, while that of the hydrogel synthesized by the non-freeze polymerization method is only (20.29 ± 0.395) mg/g. The fitting parameter, n, of the Freundlich isotherm increases linearly with the increase in MA content for the hydrogel synthesized by the freeze polymerization method, and the increasing degree is larger than that of the hydrogel synthesized by the non-freeze polymerization method. After five repeated adsorption–desorption cycles, it is found that there is no significant deformation and the adsorption capacity is not obviously decreased for the hydrogel synthesized by the freeze polymerization method, while the hydrogel synthesized by the non-freeze polymerization method is broken after three repeated adsorption–desorption cycles. The GO/P(NIPAM-MA) hydrogel synthesized by the freeze polymerization method has the advantages of large equilibrium adsorption capacity for La3+ and reusability.

【Keywords】 adsorption; desorption; hydrogel; freeze polymerization; La3+;

【DOI】

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 70, No. 10, Pages 4072-4079+3612

October 2019

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Article Outline

Abstract

  • Introduction
  • 1 Experimental
  • 2 Results and discussion
  • 3 Conclusions
  • Symbol description
  • References