Cargando…

Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents

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 usin...

Descripción completa

Detalles Bibliográficos
Autores principales: Baimenov, Alzhan, Berillo, Dmitriy, Azat, Seitkhan, Nurgozhin, Talgat, Inglezakis, Vassilis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7650616/
https://www.ncbi.nlm.nih.gov/pubmed/33086639
http://dx.doi.org/10.3390/polym12102405
_version_ 1783607517437231104
author Baimenov, Alzhan
Berillo, Dmitriy
Azat, Seitkhan
Nurgozhin, Talgat
Inglezakis, Vassilis
author_facet Baimenov, Alzhan
Berillo, Dmitriy
Azat, Seitkhan
Nurgozhin, Talgat
Inglezakis, Vassilis
author_sort Baimenov, Alzhan
collection PubMed
description 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 Cd(2+) 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 Cd(2+) 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 Cd(2+) with the cryogels’ surface functional groups. The cryogels were compared to commercially available adsorbents (zeolite Y and cation exchange resin) for the removal of Cd(2+) 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.
format Online
Article
Text
id pubmed-7650616
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-76506162020-11-10 Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents Baimenov, Alzhan Berillo, Dmitriy Azat, Seitkhan Nurgozhin, Talgat Inglezakis, Vassilis Polymers (Basel) Article 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 Cd(2+) 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 Cd(2+) 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 Cd(2+) with the cryogels’ surface functional groups. The cryogels were compared to commercially available adsorbents (zeolite Y and cation exchange resin) for the removal of Cd(2+) 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. MDPI 2020-10-19 /pmc/articles/PMC7650616/ /pubmed/33086639 http://dx.doi.org/10.3390/polym12102405 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Baimenov, Alzhan
Berillo, Dmitriy
Azat, Seitkhan
Nurgozhin, Talgat
Inglezakis, Vassilis
Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title_full Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title_fullStr Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title_full_unstemmed Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title_short Removal of Cd(2+) from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents
title_sort removal of cd(2+) from water by use of super-macroporous cryogels and comparison to commercial adsorbents
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7650616/
https://www.ncbi.nlm.nih.gov/pubmed/33086639
http://dx.doi.org/10.3390/polym12102405
work_keys_str_mv AT baimenovalzhan removalofcd2fromwaterbyuseofsupermacroporouscryogelsandcomparisontocommercialadsorbents
AT berillodmitriy removalofcd2fromwaterbyuseofsupermacroporouscryogelsandcomparisontocommercialadsorbents
AT azatseitkhan removalofcd2fromwaterbyuseofsupermacroporouscryogelsandcomparisontocommercialadsorbents
AT nurgozhintalgat removalofcd2fromwaterbyuseofsupermacroporouscryogelsandcomparisontocommercialadsorbents
AT inglezakisvassilis removalofcd2fromwaterbyuseofsupermacroporouscryogelsandcomparisontocommercialadsorbents