Removal of Cd2+ from water by use of super-macroporous cryogels and comparison to commercial adsorbents

Alzhan Baimenov, Dmitriy Berillo, Seitkhan Azat, Talgat Nurgozhin, Vassilis Inglezakis

Research output: Contribution to journalArticle

Abstract

In this study amphoteric cryogels were synthesized by the use of free-radical co-polymerization of acrylate-based precursors (methacrylic acid and 2-acrylamido-2-methyl-1-propansulfonic acid) with allylamine at different ratios. The physico-chemical characteristics of the cryogels were examined using SEM/EDX, FT-IR, XPS and zeta potential measurements. The cryogels were tested toward Cd2+ removal from aqueous solutions at various pH and initial concentrations. Equilibrium studies revealed a maximum sorption capacity in the range of 132–249 mg/g. Leaching experiments indicated the stability of Cd2+ in the cryogel structure. Based on kinetics, equilibrium and characterization results, possible removal mechanisms are proposed, indicating a combination of ion exchange and complexation of Cd2+ with the cryogels’ surface functional groups. The cryogels were compared to commercially available adsorbents (zeolite Y and cation exchange resin) for the removal of Cd2+ from various water matrices (ultrapure water, tap water and river water) and the results showed that, under the experimental conditions used, the cryogels can be more effective adsorbents.
Original languageEnglish
Article number2405
Number of pages19
JournalPolymers
Volume12
Issue number10
DOIs
Publication statusPublished - 19 Oct 2020

Keywords

  • cryogels
  • adsorption
  • ion‐exchange
  • complexation
  • cadmium
  • water treatment

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