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Enhanced adsorption of phosphate by loading nanosized ferric oxyhydroxide on anion resin |
Jing REN1,Nan LI1,*(),Lin ZHAO1,Nanqi REN2,*() |
1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China 2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China |
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Abstract Ferric oxyhydroxide loaded anion exchanger (FOAE) hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide (FO) on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD analysis confirmed the existence of FO on FOAE. After FO loading, the adsorption capacity of the hybrid adsorbent increased from 38.70 to 51.52 mg·g-1. Adsorption processes for both FOAE and anion resin were better fit to the pseudo first order model. Batch adsorption experiments revealed that higher temperature (313K), higher initial phosphate concentration (50 mg·L-1) and lower solution pH (pH value of 2) would be more propitious to phosphate adsorption. Competition effect of coexisting anions on phosphate removal can be concluded as sulfate>nitrate>chloride. Freundlich isotherm model can describe the adsorption of phosphate on FOAE more accurately, which indicated the heterogeneous adsorption occurred on the inner-surface of FOAE.
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Keywords
phosphate removal
adsorption
nanosized ferric oxyhydroxide
anion exchanger
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Corresponding Author(s):
Nan LI
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Issue Date: 11 June 2014
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