期刊
CHEMICAL ENGINEERING JOURNAL
卷 260, 期 -, 页码 269-283出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.08.030
关键词
Hydrogel; Synthesis; Swelling; Dye adsorption; Kinetics; Adsorption isotherms
资金
- Council of Scientific and Industrial Research (CSIR) [22(0547)/11/EMR-II]
- Department of Science and Technology (DST), Govt. of India [SR/S3/CE/056/2009]
Superabsorbent hydrogels were synthesized from polyethylene glycol (PEG) and crosslinked polyacrylic acid. Nano clay filled composite hydrogels were also synthesized by incorporating 0.5, 1.0 and 1.5 wt% nano size bentonite filler in the hydrogels. These hydrogels were characterized by FTIR, SEM, XRD, DTA-TGA, swelling and diffusion characteristics. The filled composite hydrogels showing the best result in swelling was further used for adsorption of congo red (CR) and methyl violet (MV) dye from water. The composite hydrogel showed high adsorption and removal% for these dyes for both low (2.5-50 mg/L) and high range (100-600 mg/L) of feed dye concentration. The dye adsorption data were fitted to different kinetics and adsorption isotherm models. The external mass transfer coefficient, diffusion coefficient and thermodynamic parameters of dye adsorption were also determined. (C) 2014 Elsevier B.V. All rights reserved.
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