Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579614 | Journal of Hazardous Materials | 2011 | 8 Pages |
Abstract
This work investigated that weak-base anion exchange fibers named FVA-c and FVA-f were selectively and rapidly taken up phosphate from water. The chemical structure of both FVA-c and FVA-f was the same; i.e., poly(vinylamine) chains grafted onto polyethylene coated polypropylene fibers. Batch study using FVA-c clarified that this preferred phosphate to chloride, nitrate and sulfate in neutral pH region and an equilibrium capacity of FVA-c for phosphate was from 2.45 to 6.87Â mmol/g. Column study using FVA-f made it clear that breakthrough capacities of FVA-f were not strongly affected by flow rates from 150 to 2000Â hâ1 as well as phosphate feed concentration from 0.072 to 1.6Â mM. Under these conditions, breakthrough capacities were from 0.84 to 1.43Â mmol/g indicating high kinetic performances. Trace concentration of phosphate was also removed from feeds containing 0.021 and 0.035Â mM of phosphate at high feed flow rate of 2500Â hâ1, breakthrough capacities were 0.676 and 0.741Â mmol/g, respectively. The column study also clarified that chloride and sulfate did not strongly interfere with phosphate uptake even in their presence of equimolar and fivefold molar levels. Adsorbed phosphate on FVA-f was quantitatively eluted with 1Â M HCl acid and regenerated into hydrochloride form simultaneously for next phosphate adsorption operation. Therefore, FVA-f is able to use long time even under rigorous chemical treatment of multiple regeneration/reuse cycles without any noticeable deterioration.
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Authors
Md. Rabiul Awual, Akinori Jyo, Sherif A. El-Safty, Masao Tamada, Noriaki Seko,