title: Preparation of wheat straw based superabsorbent resins and their applications as adsorbents for ammonium and phosphate removal.
abstract: 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 PO4(3-) removal from solutions were investigated. Equilibrium isotherm data of adsorption of both NH4(+) and PO4(3-) 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 PO4(3-) 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.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Su
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
mesh_terms: D000042:Absorption; D000327:Adsorption; D064751:Ammonium Compounds / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009994:Osmolar Concentration; D010710:Phosphates / Q000302:isolation & purification*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014908:Triticum
chemical_list: D064751:Ammonium Compounds; D010710:Phosphates
keywords: Adsorption; Ammonium; Phosphate; Semi-IPNs superabsorbent resin; Wheat straw