High concentration of arsenate removal by electrocoagulation with calcium

Ching Yao Hu, Shang Lien Lo, Wen Hui Kuan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The effect of calcium on arsenate removal by electrocoagulation with aluminum electrode was investigated in this study. The addition of calcium salt dramatically improved the removal efficiency of As(V). The residual arsenate decreased from more than 0.5 mM to less than 0.05 mM after the addition of stoichiometrically equivalent amounts of calcium salt (γ = 1). The arsenate cannot be completely removed if the γ is under 1. If the γ is over 1, the calcium concentration rose and lead to the increase of hardness. The calcium ions can neutralize the negative surface charges of the precipitate and increase the binding energy of As-O. The addition of calcium also prevented the formation of deposit layer on anode surface which caused an increase of applied potential and decrease the concentration of dissolve aluminum.

Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalSeparation and Purification Technology
Volume126
DOIs
Publication statusPublished - Apr 15 2014

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Calcium
Aluminum
Salts
Surface charge
Binding energy
arsenic acid
Precipitates
Anodes
Deposits
Hardness
Ions
Electrodes

Keywords

  • Aluminum
  • Arsenate
  • Calcium
  • Charge loading
  • Electrocoagulation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

High concentration of arsenate removal by electrocoagulation with calcium. / Hu, Ching Yao; Lo, Shang Lien; Kuan, Wen Hui.

In: Separation and Purification Technology, Vol. 126, 15.04.2014, p. 7-14.

Research output: Contribution to journalArticle

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AB - The effect of calcium on arsenate removal by electrocoagulation with aluminum electrode was investigated in this study. The addition of calcium salt dramatically improved the removal efficiency of As(V). The residual arsenate decreased from more than 0.5 mM to less than 0.05 mM after the addition of stoichiometrically equivalent amounts of calcium salt (γ = 1). The arsenate cannot be completely removed if the γ is under 1. If the γ is over 1, the calcium concentration rose and lead to the increase of hardness. The calcium ions can neutralize the negative surface charges of the precipitate and increase the binding energy of As-O. The addition of calcium also prevented the formation of deposit layer on anode surface which caused an increase of applied potential and decrease the concentration of dissolve aluminum.

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