Removal of Arsenic (III) from groundwater applying a reusable Mg-Fe-Cl layered double hydroxide

Jia-Qian Jiang*, S.M. Ashekuzzaman , Justin S.J. Hargreaves, Andrew R. McFarlane, A. Borhan M. Badruzzaman, Mehedi Hasan Tarek

*Corresponding author for this work

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Abstract

BACKGROUND
Layered double hydroxide compounds (LDHs) have been applied for the removal of oxyanions including arsenate (As(V)). However, the aim of this present research is to develop a LDH to treat arsenite (As(III)). Both batch and column sorption studies were conducted to assess the effect of LDH dosage, contact time, solution pH and initial As(III) concentrations on the As(III) removal performance. The potential re‐use of this sorbent was also investigated.

RESULTS
For 2 g L−1 of Mg‐Fe‐Cl LDH, As(III) in test solution can be reduced from 400 µg L−1 to <10 µg L−1 after a contact time of 2 h. High As(III) concentration in Bangladesh groundwater can be reduced to meet the national drinking water standards (<50 µg L−1). The maximum adsorption capacity of As(III) by Mg‐Fe‐Cl LDH is 14.6 mg g−1‐LDH. Further, reusability of this sorbent was at least 20 cycles of regeneration with effective As(III) removal between 93.0 and 98.5%. Moreover, As(III) removal was unaffected by the solution pH but affected by the co‐existing competing anions and concentration of As(III). Finally, the main mechanism of As(III) removal by Mg‐Fe‐Cl LDH was suggested to be chemical sorption together with anion and ligand exchange with interlayer Cl− and OH− ions.

CONCLUSION
High efficiency of sorption of As(III) by the developed Mg‐Fe‐Cl LDH was demonstrated in this study which is generally not the case for most other sorbent materials. Pilot‐scale trials are needed to explore the suitability of full application of the developed Mg‐Fe‐Cl LDH for the removal of As(III).
Original languageEnglish
Pages (from-to)1160-1166
Number of pages7
JournalJournal of Chemical Technology and Biotechnology
Volume90
Issue number6
Early online date19 Dec 2014
DOIs
Publication statusPublished - Jun 2015

Keywords

  • arsenic
  • groundwater
  • oxyanions
  • water treatment

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    Jiang, J-Q., Ashekuzzaman , S. M., Hargreaves, J. S. J., McFarlane, A. R., Badruzzaman, A. B. M., & Tarek, M. H. (2015). Removal of Arsenic (III) from groundwater applying a reusable Mg-Fe-Cl layered double hydroxide. Journal of Chemical Technology and Biotechnology, 90(6), 1160-1166. https://doi.org/10.1002/jctb.4607