A mechanistic analysis of the influence of iron-oxidizing bacteria on antimony (V) removal from water by microscale zero-valent iron

Yongchao Li, Jixin Wu, Bozhi Ren, Andrew Hursthouse

Research output: Contribution to journalArticle

3 Citations (Scopus)
139 Downloads (Pure)

Abstract

BACKGROUND
Microscale zero-valent iron (mZVI) is an efficient material for removing heavy metals from water, and iron-oxidizing bacteria are the primary microorganisms responsible for iron corrosion. We investigated the effects of Sphaerotilus natans on antimony [Sb(V)] removal by mZVI using batch experiments.

RESULTS
At an initial Fe0 dose of 0.1g·L-1, 40 mg·L-1 Sb(V) was almost completely removed in an abiotic system. Although Sphaerotilus natans exhibited significant tolerance to Sb(V), its ability to adsorb Sb(V) was poor. Most importantly, the presence of Sphaerotilus natans reduced the removal rate of aqueous Sb(V) by mZVI by up to 39%. The value of the redox potential in the biologically mediated system was lower than that in the abiotic control, indicating oxygen consumption by Sphaerotilus natans. In the presence of Sphaerotilus natans, the main reaction products were FeOOH and FeSb2O6, compared to Fe2O3 in the abiotic system. Biomineralization of Fe3+ ions by Sphaerotilus natans may have occurred during the experiment, but it did not play a significant role in Sb(V) removal.

CONCLUSION
mZVI can be efficiently used to remove Sb(V) from water. However, the presence of Sphaerotilus natans may inhibit its removal ability, likely due to the decreased mass transfer and lower corrosion of iron.
Original languageEnglish
Pages (from-to)2527-2534
JournalJournal of Chemical Technology and Biotechnology
Volume93
Early online date9 Feb 2018
DOIs
Publication statusE-pub ahead of print - 9 Feb 2018

Keywords

  • Antimony
  • microscale zero-valent iron
  • iron-oxidising bacterial
  • bioinhibitory effect

Fingerprint Dive into the research topics of 'A mechanistic analysis of the influence of iron-oxidizing bacteria on antimony (V) removal from water by microscale zero-valent iron'. Together they form a unique fingerprint.

  • Activities

    • 1 Types of Award - Fellowship awarded competitively

    High End Expert Scholarship – Hunan Regional Government

    Andrew Hursthouse (Recipient)

    20162019

    Activity: OtherTypes of Award - Fellowship awarded competitively

    Cite this