Journal
BIORESOURCE TECHNOLOGY
Volume 143, Issue -, Pages 32-39Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.05.100
Keywords
Ammonium; Phosphate; Semi-IPNs superabsorbent resin; Wheat straw; Adsorption
Funding
- National Natural Science Foundation of China [21007034]
- Natural Science Foundation of Shandong Province [ZR2010EQ031]
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A novel wheat straw cellulose-g-poly (potassium acrylate)/polyvinyl alcohol (WSC-g-PKA/PVA) semi-interpenetrating polymer networks (semi-IPNs) superabsorbent resin (SAR) was prepared by graft copolymerization. The structure and performance of the WSC-g-PKA/PVA semi-IPNs SAR was studied and compared with those of wheat straw cellulose-g-poly (potassium acrylate) (WSC-g-PKA) SAR. The effects of various experimental parameters such as solution pH, concentration, contact time and ion strength on NH4+ and PO43- removal from solutions were investigated. Equilibrium isotherm data of adsorption of both NH4+ and PO43- were well fitted to the Freundlich model. Kinetic analysis showed that the pseudo-second-order kinetic model was more suitable for describing the whole adsorption process of NH4+ and PO43- on SARs. Overall, WSC-g-PKA/PVA semi-IPNs SAR showed better properties in comparison with WSC-g-PKA SAR and it could be considered as one efficient material for the removal and recovery of nitrogen and phosphorus with the agronomic reuse as a fertilizer. (C) 2013 Elsevier Ltd. All rights reserved.
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