Removal of Cd<sup>2+</sup> 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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/12/10/2405 |
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| author | Alzhan Baimenov Dmitriy Berillo Seitkhan Azat Talgat Nurgozhin Vassilis Inglezakis |
| author_facet | Alzhan Baimenov Dmitriy Berillo Seitkhan Azat Talgat Nurgozhin Vassilis Inglezakis |
| author_sort | Alzhan Baimenov |
| collection | DOAJ |
| 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<sup>2+</sup> 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<sup>2+</sup> 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<sup>2+ </sup>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<sup>2+</sup> 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. |
| first_indexed | 2024-03-10T15:30:11Z |
| format | Article |
| id | doaj.art-0e22bac5b61b4a4d8826524ae5bdab91 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T15:30:11Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-0e22bac5b61b4a4d8826524ae5bdab912023-11-20T17:40:45ZengMDPI AGPolymers2073-43602020-10-011210240510.3390/polym12102405Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial AdsorbentsAlzhan Baimenov0Dmitriy Berillo1Seitkhan Azat2Talgat Nurgozhin3Vassilis Inglezakis4Environmental Science & Technology Group (ESTg), Chemical & Materials Engineering Department, School of Engineering & Digital Sciences, Nazarbayev University, Nur-Sultan 010000, KazakhstanDepartment of Pharmaceutical and Toxicological Chemistry, Pharmacognosy and Botany School of Pharmacy, Kazakh National Medical University, Almaty 050012, KazakhstanFaculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050012, KazakhstanDepartment of Pharmaceutical and Toxicological Chemistry, Pharmacognosy and Botany School of Pharmacy, Kazakh National Medical University, Almaty 050012, KazakhstanDepartment of Chemical & Process Engineering, University of Strathclyde, Glasgow G1 1XJ, UKIn 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<sup>2+</sup> 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<sup>2+</sup> 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<sup>2+ </sup>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<sup>2+</sup> 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.https://www.mdpi.com/2073-4360/12/10/2405cryogelsadsorptionion-exchangecomplexationcadmiumwater treatment |
| spellingShingle | Alzhan Baimenov Dmitriy Berillo Seitkhan Azat Talgat Nurgozhin Vassilis Inglezakis Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents Polymers cryogels adsorption ion-exchange complexation cadmium water treatment |
| title | Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents |
| title_full | Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents |
| title_fullStr | Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents |
| title_full_unstemmed | Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents |
| title_short | Removal of Cd<sup>2+</sup> from Water by Use of Super-Macroporous Cryogels and Comparison to Commercial Adsorbents |
| title_sort | removal of cd sup 2 sup from water by use of super macroporous cryogels and comparison to commercial adsorbents |
| topic | cryogels adsorption ion-exchange complexation cadmium water treatment |
| url | https://www.mdpi.com/2073-4360/12/10/2405 |
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