A weak-base fibrous anion exchanger effective for rapid phosphate removal from water

Md Rabiul Awual, Akinori Jyo, Sherif A. El-Safty, Masao Tamada, Noriaki Seko

Research output: Contribution to journalArticle

136 Citations (Scopus)

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 6.87mmol/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 2000h-1 as well as phosphate feed concentration from 0.072 to 1.6mM. Under these conditions, breakthrough capacities were from 0.84 to 1.43mmol/g indicating high kinetic performances. Trace concentration of phosphate was also removed from feeds containing 0.021 and 0.035mM of phosphate at high feed flow rate of 2500h-1, breakthrough capacities were 0.676 and 0.741mmol/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 1M 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.

Original languageEnglish
Pages (from-to)164-171
Number of pages8
JournalJournal of Hazardous Materials
Volume188
Issue number1-3
DOIs
Publication statusPublished - 2011 Apr 15
Externally publishedYes

Keywords

  • Anion exchange
  • Breakthrough point
  • Competing anions
  • High selectivity
  • Phosphate
  • Rapid phosphate removal
  • Weak-base fibers

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

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