Effective removal of methylene blue dye by a novel 4-vinylpyridine-co-methacrylic acid cryogel: kinetic, isotherm, and breakthrough studies

Megbenu H.K. Tauanov Z. Daulbayev C. Poulopoulos S.G. Baimenov A.
December 2022 John Wiley and Sons Ltd

Journal of Chemical Technology and Biotechnology
2022 #97 Issue 12 3375 - 3384 pp.

BACKGROUND: Industrial streams are the source of increasing amounts of textile dye pollution every year. Among the various adsorbents that have been tested for the removal of dyes, synthetic macroporous polymers are a promising choice due to their developed structure, the presence of active functional groups, and the possibility of regeneration and reuse for several cycles. In this work, a 4-vinylpyridine-co-methacrylic acid based cryogel (4-VP-MAAc) was synthesized at -12 °C by the free-radical polymerization technique, it was characterized using a set of complimentary methods, and then applied for the removal of methylene blue (MB) from water solutions. RESULTS: The adsorption of MB was enhanced at pH values higher than 7 due to the presence of anionic functional groups. The maximum equilibrium adsorption capacity achieved by 4-VP-MAAc was 703.6 mg/g at pH 8. Several kinetics, equilibrium, pH studies, and fixed-bed column experiments were completed in ultra-pure water to evaluate the performance and the mechanism of interaction of positively-charged dye with the polymer. Among the kinetic models applied, the pseudo-second order model best fit the experimental observations. The Langmuir model efficiently described the adsorption of MB onto the prepared cryogel, thus indicating monolayer adsorption. The ion exchange of the Na⁺ ions present in the structure of the cryogel with dye was found to be the main removal mechanism accompanied with a complexation reaction. No loss of adsorption capacity was observed in four successive adsorption/desorption cycles of 4-VP-MAAc use. CONCLUSION: This is the first time that a 4-vinylpyridine-co-methacrylic acid based cryogel has been synthesized and successfully applied to remove MB from water. © 2022 Society of Chemical Industry (SCI).

4-VP-MAAc , cryogels , ion exchange , methylene blue , textile dye pollution

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Chemical and Materials Engineering Department, School of Engineering, Nazarbayev University, Nur-Sultan, Kazakhstan
National Laboratory Astana, Nazarbayev University, Nur-Sultan, Kazakhstan
Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, Kazakhstan

Chemical and Materials Engineering Department
National Laboratory Astana
Faculty of Chemistry and Chemical Technology

10 лет помогаем публиковать статьи Международный издатель

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