title: In-situ modification, regeneration, and application of keratin biopolymer for arsenic removal.
abstract: 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(-2)and 11.0 × 10(-2)mg/g from 100ml arsenic polluted water solution respectively. Thermodynamic parameters such as ΔG(0), ΔH(0), ΔS(0) 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).
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, T6G 2P5 Canada.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Khosa
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, T6G 2P5 Canada. Electronic address: amanullah@ualberta.ca.
authors.forename: Aman
authors.initials: A
authors.lastname: Ullah
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000327:Adsorption; D000818:Animals; D001151:Arsenic / Q000737:chemistry*; D002645:Chickens; D004853:Epoxy Resins / Q000737:chemistry; D005241:Feathers; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007633:Keratins / Q000737:chemistry*; D017646:Organosilicon Compounds / Q000737:chemistry; D020005:Propanols / Q000737:chemistry; D013818:Thermogravimetry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000180:Acrylic Resins; D004853:Epoxy Resins; D017646:Organosilicon Compounds; D020005:Propanols; D014874:Water Pollutants, Chemical; C052970:poly-N-isopropylacrylamide; C035364:Quetol 651; C006463:allyl alcohol; D007633:Keratins; D001151:Arsenic
keywords: Biopolymer; Biosorbent; Chicken feathers; Dopant; Keratin; Modification