Phosphate Removal by Anion Binding on Functionalized Nanoporous Sorbents
| Autor: | Thanapon Sangvanich, Robert J. Wiacek, Kanda Pattamakomsan, Wassana Yantasee, Wilaiwan Chouyyok, Glen E. Fryxell, Rafal M. Grudzien |
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| Rok vydání: | 2010 |
| Předmět: |
Anions
Phosphorus Bicarbonate Osmolar Concentration Inorganic chemistry Langmuir adsorption model chemistry.chemical_element Sorption General Chemistry Hydrogen-Ion Concentration Phosphate Article Phosphates Kinetics chemistry.chemical_compound symbols.namesake Adsorption chemistry Ionic strength symbols Nanoparticles Thermodynamics Environmental Chemistry Anion binding |
| Zdroj: | Environmental Science & Technology. 44:3073-3078 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | 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 approximately 10 microg/L of phosphorus, which is lower than the EPA's established freshwater contaminant level for phosphorus (20 microg/L). |
| Databáze: | OpenAIRE |
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