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In-situ modification, regeneration, and application of keratin biopolymer for arsenic removal

Khosa, Muhammad A., Ullah, Aman
Journal of hazardous materials 2014 v.278 pp. 360-371
Fourier transform infrared spectroscopy, X-ray diffraction, allyl alcohol, arsenic, biopolymers, biosorbents, chickens, ethylene glycol, feathers, keratin, models, pH, polyethylene glycol, regression analysis, scanning electron microscopy, solubilization, sorption, sorption isotherms, thermal degradation, thermodynamics, water pollution
Chemical modification of chicken feathers (CF) and their subsequent role in arsenic removal from water is presented in this paper. The ground CF were chemically treated with four selective dopants such as poly (ethylene glycol) (PEG) diglycidyl ether, poly (N-isopropylacrylamide) (PNIPAM), allyl alcohol (AA) and TrisilanolCyclohexyl POSS. After modification, the solubilized keratin was regenerated by precipitation at acidic pH. The structural changes and properties of modified biopolymer were compared with untreated CF and confirmed by different characterization techniques such as SEM, FTIR, XRD, and DSC. The TGA data was used to discuss thermal decomposition and kinetic behavior of modified biopolymer exhaustively. The modified biopolymers were further investigated as biosorbents for their application in As(III) removal from water. The AA and POSS supported biosorbents executed high removal capacity for As(III) up to 11.5×10−2and 11.0×10−2mg/g from 100ml arsenic polluted water solution respectively. Thermodynamic parameters such as ΔG0, ΔH0, ΔS0 were also evaluated with the finding that overall sorption process was endothermic and spontaneous in nature. Based on linear and non-linear regression analysis, Freundlich Isotherm model showed good fit for obtained sorption data apart from high linear regression values supporting Langmuir isotherm model in sorption of As(III).