期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 144, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2019.104346
关键词
Dye adsorption; Hydrogel; Wastewater treatment; Reusability; Dye adsorption kinetics and mechanism
资金
- FIST program of DST, Government of India [SR/FST/PSI/225/2016]
- Department of Science and Technology (DST), India [SB/S2/CMP 077/2013]
- Council of Scientific and Industrial Research (CSIR), India [03(1310)/14/EMR-II]
- DST-INDIA, New Delhi [IF150378]
An efficient method for the removal of methylene blue dye (MB) (cationic-dye) from aqueous solution under alkaline conditions was explored, by synthesizing and utilizing suitable pH sensitive poly (acrylic acid-co-vinylsulfonic acid) hydrogel (PAAVSA). The hydrogel was synthesized by free radical polymerization reaction using optimum ratio of the acrylic acid and vinylsulfonic acid monomers. The functional groups present in PAAVSA (i.e. COO- and SO3- groups) have strong affinity with positively charged (cationic) dye molecule, enabling absorption and trapping of cationic dyes from aqueous solution. Synthesized PAAVSA was characterized by Raman and Fourier-transform-infrared-spectroscopy techniques, while significant pH response of PAAVSA, was evident through swelling studies, indicating large swelling ratio, similar to 250, at higher pH values. Fieldemission-scanning-electron-microscopy (FESEM) images of the respective freeze-dried PAAVSA samples swelled at different pH, exhibit distinct pH-responsive change in surface morphology of the hydrogel. PAAVSA shows significant efficiency as an adsorbent for the removal of cationic dyes (MB-dye) from aqueous solution at higher pH values (pH 7 and above), along with biocompatibility and excellent reusability, leading to potential application in waste-water treatment. The adsorption kinetics and isotherm analysis indicate that the overall adsorption process was governed by chemisorption through heterogeneous surfaces having different activation energies for adsorption of MB-dye.
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