Removal of trace arsenic(V) and phosphate from water by a highly selective ligand exchange adsorbent

Md Rabiul Awual, Sherif A. El-Safty, Akinori Jyo

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

A highly selective ligand exchange type adsorbent was developed for the removal of trace arsenic(V) (As(V)) and phosphate from water. This adsorbent was prepared by loading zirconium(IV) on monophosphonic acid resin. This adsorbent was able to remove toxic anions efficiently at wide pH ranges. However, low pH was preferable for maximum breakthrough capacity in an adsorption operation. The effect of a large amount of competing anions such as chloride, bicarbonate, and sulfate on the adsorption systems of As(V) and phosphate anions was investigated. The experimental findings revealed that the As(V) and phosphate uptakes were not affected by these competing anions despite the enhancement of the breakthrough points and total adsorption. Phosphate anion was slightly preferable than As(V) in their competitive adsorption by the adsorbent. The adsorbed As(V) and phosphate on the Zr(IV)-loaded resin were quantitatively eluted with 0.1 mol/L sodium hydroxide solution, and the adsorbent was regenerated by 0.5 mol/L sulfuric acid. During several cycles of adsorption-elution-regeneration operations, no Zr(IV) was detected in the column effluents. Therefore, the Zr(IV)-loaded monophosphonic acid resin is an effective ligand exchange adsorbent for removing trace concentrations of As(V) and phosphate from water.

Original languageEnglish
Pages (from-to)1947-1954
Number of pages8
JournalJournal of Environmental Sciences
Volume23
Issue number12
DOIs
Publication statusPublished - 2011 Dec
Externally publishedYes

Keywords

  • Arsenic(V)
  • Common anions
  • Ligand exchange adsorbent
  • Phosphate
  • Regeneration

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

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