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

公共衛生學系

研究成果: 雜誌貢獻 › 文章 › 同行評審

41 引文斯高帕斯（Scopus）

摘要

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.

原文	英語
頁（從 - 到）	7-14
頁數	8
期刊	Separation and Purification Technology
卷	126
DOIs	https://doi.org/10.1016/j.seppur.2014.02.015
出版狀態	已發佈 - 4月 15 2014

ASJC Scopus subject areas

分析化學
篩選和分離

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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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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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High concentration of arsenate removal by electrocoagulation with calcium

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