5 years ago

Gellan gum-based novel composite hydrogel: Evaluation as adsorbent for cationic dyes

Gellan gum-based novel composite hydrogel: Evaluation as adsorbent for cationic dyes
K. Arun Krishna, B. Vishalakshi
A semi-interpenetrating network system [(GG-g-PAAm)-PVA] was made by microwave irradiation of aqueous mixture of gellan gum (GG), acrylamide (AAm), and poly(vinyl alcohol) (PVA) containing N,N′-methylene-bis-acrylamide as crosslinking agent. The gel was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy techniques. The swelling behavior was studied under different pH conditions. A pH-dependent swelling with maximum swelling under neutral pH was observed. The swelling process is found to follow second-order kinetics and the mechanism of water transport is found to be Fickian type of diffusion. The (GG-g-PAAm)-PVA was evaluated for removal of dye from aqueous solution, using crystal violet, a cationic dye. The maximum adsorption capacity of the gel was found to be 45.45 mg/g. The kinetic studies revealed a second-order adsorption process which fits well into Langmuir model. The evaluation of thermodynamic parameters indicated the adsorption process to be exothermic and spontaneous at lower temperatures. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45527.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45527

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