Simultaneous arsenate and alkali removal from alkaline wastewater by in-situ formation of Zn-Al layered double hydroxide

Zilin Meng; Fengzhu Lv; Xiaowei Li; Qian Zhang; Paul K. Chu; Sridhar Komarneni; Yihe Zhang

doi:10.1016/j.micromeso.2016.02.046

Simultaneous arsenate and alkali removal from alkaline wastewater by in-situ formation of Zn-Al layered double hydroxide

Zilin Meng, Fengzhu Lv, Xiaowei Li, Qian Zhang, Paul K. Chu, Sridhar Komarneni, Yihe Zhang

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14 Scopus citations

Abstract

An effective and facile method was developed to remove As(V) and alkali simultaneously from alkaline wastewater based on the repeated in-situ formation of Zn-Al-AsO₄ layered double hydroxide (ZnAl-AsO₄ LDH). The removal efficiency of As(V) was almost 100% and the pH of the treated alkaline wastewater decreased from 12 to 7.47. Removal of As(V) was not affected by competitive anions such as SO₄^2-, F^-, Cl^-, and NO₃^- due to the large binding energy between As(V) and LDH sheets as confirmed by calculations based on the Castep Module of Materials. About 96% of As(V) can be released and concentrated into a small volume of Na₂CO₃ solution for disposal or recovery. The LDH was then dissolved in HNO₃ and the solution can be used to treat wastewater to reform Zn-Al LDH for further removal of arsenate. This process was repeated four times but after the fifth cycle, the removal efficiency went down by the loss of Al³⁺ to solution but the process can be repeated by replenishing the solution with Al³⁺. The newly developed process is eminently suited for remediation of arsenate and alkali simultaneously from alkaline wastewater.

Original language	English (US)
Pages (from-to)	137-143
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	227
DOIs	https://doi.org/10.1016/j.micromeso.2016.02.046
State	Published - Jun 1 2016

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials

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title = "Simultaneous arsenate and alkali removal from alkaline wastewater by in-situ formation of Zn-Al layered double hydroxide",

abstract = "An effective and facile method was developed to remove As(V) and alkali simultaneously from alkaline wastewater based on the repeated in-situ formation of Zn-Al-AsO4 layered double hydroxide (ZnAl-AsO4 LDH). The removal efficiency of As(V) was almost 100% and the pH of the treated alkaline wastewater decreased from 12 to 7.47. Removal of As(V) was not affected by competitive anions such as SO42-, F-, Cl-, and NO3- due to the large binding energy between As(V) and LDH sheets as confirmed by calculations based on the Castep Module of Materials. About 96% of As(V) can be released and concentrated into a small volume of Na2CO3 solution for disposal or recovery. The LDH was then dissolved in HNO3 and the solution can be used to treat wastewater to reform Zn-Al LDH for further removal of arsenate. This process was repeated four times but after the fifth cycle, the removal efficiency went down by the loss of Al3+ to solution but the process can be repeated by replenishing the solution with Al3+. The newly developed process is eminently suited for remediation of arsenate and alkali simultaneously from alkaline wastewater.",

author = "Zilin Meng and Fengzhu Lv and Xiaowei Li and Qian Zhang and Chu, {Paul K.} and Sridhar Komarneni and Yihe Zhang",

note = "Funding Information: This work was supported by the National High Technology Research and Development Program (863 Program 2012AA06A109 ) of China, China Scholarship Council and City University of Hong Kong Strategic Research Grant (SRG) No. 7004188 . One of us (SK) was supported by the College of Agricultural Sciences under Station Research Project No. PEN04566 . Publisher Copyright: {\textcopyright} 2016 Elsevier Inc. All rights reserved.",

year = "2016",

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doi = "10.1016/j.micromeso.2016.02.046",

language = "English (US)",

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T1 - Simultaneous arsenate and alkali removal from alkaline wastewater by in-situ formation of Zn-Al layered double hydroxide

AU - Meng, Zilin

AU - Lv, Fengzhu

AU - Li, Xiaowei

AU - Zhang, Qian

AU - Chu, Paul K.

AU - Komarneni, Sridhar

AU - Zhang, Yihe

N1 - Funding Information: This work was supported by the National High Technology Research and Development Program (863 Program 2012AA06A109 ) of China, China Scholarship Council and City University of Hong Kong Strategic Research Grant (SRG) No. 7004188 . One of us (SK) was supported by the College of Agricultural Sciences under Station Research Project No. PEN04566 . Publisher Copyright: © 2016 Elsevier Inc. All rights reserved.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - An effective and facile method was developed to remove As(V) and alkali simultaneously from alkaline wastewater based on the repeated in-situ formation of Zn-Al-AsO4 layered double hydroxide (ZnAl-AsO4 LDH). The removal efficiency of As(V) was almost 100% and the pH of the treated alkaline wastewater decreased from 12 to 7.47. Removal of As(V) was not affected by competitive anions such as SO42-, F-, Cl-, and NO3- due to the large binding energy between As(V) and LDH sheets as confirmed by calculations based on the Castep Module of Materials. About 96% of As(V) can be released and concentrated into a small volume of Na2CO3 solution for disposal or recovery. The LDH was then dissolved in HNO3 and the solution can be used to treat wastewater to reform Zn-Al LDH for further removal of arsenate. This process was repeated four times but after the fifth cycle, the removal efficiency went down by the loss of Al3+ to solution but the process can be repeated by replenishing the solution with Al3+. The newly developed process is eminently suited for remediation of arsenate and alkali simultaneously from alkaline wastewater.

AB - An effective and facile method was developed to remove As(V) and alkali simultaneously from alkaline wastewater based on the repeated in-situ formation of Zn-Al-AsO4 layered double hydroxide (ZnAl-AsO4 LDH). The removal efficiency of As(V) was almost 100% and the pH of the treated alkaline wastewater decreased from 12 to 7.47. Removal of As(V) was not affected by competitive anions such as SO42-, F-, Cl-, and NO3- due to the large binding energy between As(V) and LDH sheets as confirmed by calculations based on the Castep Module of Materials. About 96% of As(V) can be released and concentrated into a small volume of Na2CO3 solution for disposal or recovery. The LDH was then dissolved in HNO3 and the solution can be used to treat wastewater to reform Zn-Al LDH for further removal of arsenate. This process was repeated four times but after the fifth cycle, the removal efficiency went down by the loss of Al3+ to solution but the process can be repeated by replenishing the solution with Al3+. The newly developed process is eminently suited for remediation of arsenate and alkali simultaneously from alkaline wastewater.

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JF - Microporous and Mesoporous Materials

ER -

Simultaneous arsenate and alkali removal from alkaline wastewater by in-situ formation of Zn-Al layered double hydroxide

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