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

110 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

Fingerprint

Ion exchangers
Anions
anion
Phosphates
Negative ions
phosphate
Water
water
Sulfates
Chlorides
chloride
Flow rate
sulfate
phosphate removal
Fibers
Polypropylenes
Polyethylene
Nitrates
Adsorption
Deterioration

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

Cite this

A weak-base fibrous anion exchanger effective for rapid phosphate removal from water. / Awual, Md Rabiul; Jyo, Akinori; El-Safty, Sherif A.; Tamada, Masao; Seko, Noriaki.

In: Journal of Hazardous Materials, Vol. 188, No. 1-3, 15.04.2011, p. 164-171.

Research output: Contribution to journalArticle

Awual, Md Rabiul ; Jyo, Akinori ; El-Safty, Sherif A. ; Tamada, Masao ; Seko, Noriaki. / A weak-base fibrous anion exchanger effective for rapid phosphate removal from water. In: Journal of Hazardous Materials. 2011 ; Vol. 188, No. 1-3. pp. 164-171.
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