TY - JOUR
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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U2 - 10.1016/j.micromeso.2016.02.046
DO - 10.1016/j.micromeso.2016.02.046
M3 - Article
AN - SCOPUS:84960345375
SN - 1387-1811
VL - 227
SP - 137
EP - 143
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -