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Title: Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents

Abstract

Phosphate was captured from aqueous solutions by cationic metal-EDA complexes anchored inside mesoporous silica MCM-41 supports (Cu(II)-EDA-SAMMS and Fe(III)-EDA-SAMMS). Fe-EDA-SAMMS was more effective at capturing phosphate than the Cu-EDA-SAMMS and was further studied for matrix effects (e.g., pH, ionic strength, and competing anions) and sorption performance (e.g., capacity and rate). The adsorption of phosphate was highly pH dependent; it increased with increasing pH from 1.0 to 6.5, and decreased above pH 6.5. The adsorption was affected by high ionic strength (0.1 M of NaCl). In the presence of 1000-fold molar excess of chloride and nitrate anions, phosphate removal by Fe-EDA-SAMMS was not affected. Slight, moderate and large impacts were seen with bicarbonate, sulfate and citrate anions, respectively. The phosphate adsorption data on Fe-EDA-SAMMS agreed well with the Langmuir model with the estimated maximum capacity of 43.3 mg/g. The material displayed rapid sorption rate (99% of phosphate removal within 1 min) and lowering the phosphate content to ~ 10 µg/L of phosphorus, which is lower than the EPA’s established freshwater contaminant level for phosphorous (20 µg/L).

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1015278
Report Number(s):
PNNL-SA-71533
Journal ID: ISSN 0013-936X; ESTHAG; 40115; 400412000; TRN: US201111%%526
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science & Technology, 44(8):3073-3078; Journal Volume: 44; Journal Issue: 8
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ADSORPTION; ANIONS; AQUEOUS SOLUTIONS; CAPACITY; CHLORIDES; CITRATES; NITRATES; PERFORMANCE; PHOSPHATES; PHOSPHORUS; REMOVAL; SILICA; SORPTION; SULFATES; Environmental Molecular Sciences Laboratory

Citation Formats

Chouyyok, Wilaiwan, Wiacek, Robert J., Pattamakomsan, Kanda, Sangvanich, Thanapon, Grudzien, Rafal M., Fryxell, Glen E., and Yantasee, Wasanna. Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents. United States: N. p., 2010. Web. doi:10.1021/es100787m.
Chouyyok, Wilaiwan, Wiacek, Robert J., Pattamakomsan, Kanda, Sangvanich, Thanapon, Grudzien, Rafal M., Fryxell, Glen E., & Yantasee, Wasanna. Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents. United States. doi:10.1021/es100787m.
Chouyyok, Wilaiwan, Wiacek, Robert J., Pattamakomsan, Kanda, Sangvanich, Thanapon, Grudzien, Rafal M., Fryxell, Glen E., and Yantasee, Wasanna. Fri . "Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents". United States. doi:10.1021/es100787m.
@article{osti_1015278,
title = {Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents},
author = {Chouyyok, Wilaiwan and Wiacek, Robert J. and Pattamakomsan, Kanda and Sangvanich, Thanapon and Grudzien, Rafal M. and Fryxell, Glen E. and Yantasee, Wasanna},
abstractNote = {Phosphate was captured from aqueous solutions by cationic metal-EDA complexes anchored inside mesoporous silica MCM-41 supports (Cu(II)-EDA-SAMMS and Fe(III)-EDA-SAMMS). Fe-EDA-SAMMS was more effective at capturing phosphate than the Cu-EDA-SAMMS and was further studied for matrix effects (e.g., pH, ionic strength, and competing anions) and sorption performance (e.g., capacity and rate). The adsorption of phosphate was highly pH dependent; it increased with increasing pH from 1.0 to 6.5, and decreased above pH 6.5. The adsorption was affected by high ionic strength (0.1 M of NaCl). In the presence of 1000-fold molar excess of chloride and nitrate anions, phosphate removal by Fe-EDA-SAMMS was not affected. Slight, moderate and large impacts were seen with bicarbonate, sulfate and citrate anions, respectively. The phosphate adsorption data on Fe-EDA-SAMMS agreed well with the Langmuir model with the estimated maximum capacity of 43.3 mg/g. The material displayed rapid sorption rate (99% of phosphate removal within 1 min) and lowering the phosphate content to ~ 10 µg/L of phosphorus, which is lower than the EPA’s established freshwater contaminant level for phosphorous (20 µg/L).},
doi = {10.1021/es100787m},
journal = {Environmental Science & Technology, 44(8):3073-3078},
number = 8,
volume = 44,
place = {United States},
year = {Fri Mar 26 00:00:00 EDT 2010},
month = {Fri Mar 26 00:00:00 EDT 2010}
}