Novel amphoteric cryogels for Cd2+ ions removal from aqueous solutions

Alzhan Baimenov, Dmitriy Berillo, Leila Abylgazina, Stavros G. Poulopoulos, Vassilis J. Inglezakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

4 Citations (Scopus)

Abstract

In this work, amphoteric cryogels based on N,N-dimethyl acrylamide, methacrylic acid and allylamine, crosslinked by N,N-methylenebisacrylamide were synthesized by free-radical polymerization in cryo-conditions. The synthesized cryogels were used for the removal of cadmium ions from aqueous solutions under different pH values. The chemical structure was studied by FTIR, porosity by nitrogen adsorption and morphology by scanning electron microscopy and texture analyzer. The amphoteric properties of cryogels were studied by zeta potential measurements. Adsorption tests revealed that cryogels exhibit 3 times higher adsorption capacity at pH 6.0 than at pH 4.0. The maximum adsorption capacity of the amphoteric cryogels for Cd2+ was 113 mg/g, at pH 6.0 and initial Cd2+ concentration 100 ppm. The results suggest that the predominant removal mechanism is ion exchange between sodium, which initially presents in the structure of the cryogel, and cadmium from the aqueous phase. Recovery studies suggested that the cryogels used can be regenerated and efficiently reused.

Original languageEnglish
Title of host publicationKey Engineering Materials VIII
EditorsAlexander M. Korsunsky, Emma Wang, Chobin Makabe
Pages376-382
Number of pages7
Volume775
DOIs
Publication statusPublished - 1 Aug 2018
Event8th International Conference on Key Engineering Materials, ICKEM 2018 - Osaka, Japan
Duration: 16 Mar 201818 Mar 2018

Publication series

NameKey Engineering Materials
Volume775 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference8th International Conference on Key Engineering Materials, ICKEM 2018
CountryJapan
CityOsaka
Period16/03/1818/03/18

Keywords

  • adsorption
  • cadmium removal
  • cryogel
  • ion-exchange

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