High concentration of arsenate removal by electrocoagulation with calcium

Ching Yao Hu; Shang Lien Lo; Wen Hui Kuan

doi:10.1016/j.seppur.2014.02.015

High concentration of arsenate removal by electrocoagulation with calcium

Ching Yao Hu, Shang Lien Lo, Wen Hui Kuan

School of Public Health

Research output: Contribution to journal › Article › peer-review

42 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 language	English
Pages (from-to)	7-14
Number of pages	8
Journal	Separation and Purification Technology
Volume	126
DOIs	https://doi.org/10.1016/j.seppur.2014.02.015
Publication status	Published - Apr 15 2014

Keywords

Aluminum
Arsenate
Calcium
Charge loading
Electrocoagulation

ASJC Scopus subject areas

Analytical Chemistry
Filtration and Separation

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10.1016/j.seppur.2014.02.015

Cite this

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title = "High concentration of arsenate removal by electrocoagulation with calcium",

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.",

keywords = "Aluminum, Arsenate, Calcium, Charge loading, Electrocoagulation",

author = "Hu, {Ching Yao} and Lo, {Shang Lien} and Kuan, {Wen Hui}",

note = "Funding Information: The authors thank the National Science Council of Taiwan for financial support of this work under contract NSC 93-2211-E-002-011 and NSC 94-2211-E-131-004 . ",

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doi = "10.1016/j.seppur.2014.02.015",

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TY - JOUR

T1 - High concentration of arsenate removal by electrocoagulation with calcium

AU - Hu, Ching Yao

AU - Lo, Shang Lien

AU - Kuan, Wen Hui

N1 - Funding Information: The authors thank the National Science Council of Taiwan for financial support of this work under contract NSC 93-2211-E-002-011 and NSC 94-2211-E-131-004 .

PY - 2014/4/15

Y1 - 2014/4/15

N2 - 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.

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.

KW - Aluminum

KW - Arsenate

KW - Calcium

KW - Charge loading

KW - Electrocoagulation

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DO - 10.1016/j.seppur.2014.02.015

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SN - 1383-5866

VL - 126

SP - 7

EP - 14

JO - Separation and Purification Technology

JF - Separation and Purification Technology

ER -

High concentration of arsenate removal by electrocoagulation with calcium

Abstract

Keywords

ASJC Scopus subject areas

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