Self-regenerable bio-hybrid with biogenic ferrous sulfide nanoparticles for treating high-concentration chromium-containing wastewater

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

52 Scopus Citations
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Author(s)

  • Jie Wu
  • Xue-Meng Wang
  • Hou-Qi Liu
  • Ru-Li He
  • Cheng Yang
  • Zhou-Liang Tan
  • Wen-Wei Li

Detail(s)

Original languageEnglish
Pages (from-to)117731
Journal / PublicationWater Research
Volume206
Online published2 Oct 2021
Publication statusPublished - 1 Nov 2021

Abstract

Biogenic ferrous sulfide nanoparticles (bio-FeS) as low-cost and green-synthesized nanomaterial are promising for heavy metals removal, but the need for complicated extraction, storage processes and the production of iron sludge still restrict their practical application. Here, a self-regenerable bio-hybrid consisting of bacterial cells and self-assembled bio-FeS was developed to efficiently remove chromium (Cr(VI)). A dense layer of bio-FeS was distributed on the cell surface and in the periplasmic space of Shewanella oneidensis MR-1, endowing the bac-terium with good Cr(VI) tolerance and unusual activity for bio-FeS-mediated Cr(VI) reduction. An artificial transmembrane electron channel was constituted by the bio-FeS to facilitate extracellular electron pumping, enabling efficient regeneration of extracellular bio-FeS for continuous Cr(VI) reduction. The bio-hybrid main-tained high activity within three consecutive treatment-regeneration cycles for treating both simulated Cr(VI)- containing wastewater (50 mg/L) and real electroplating wastewater. Importantly, its activity can be facilely and fully restored through bio-FeS re-synthesis or regeneration with replenished fresh bacteria. Overall, the bio- hybrid merges the self-regeneration ability of bacteria with high activity of bio-FeS , opening a promising new avenue for sustainable treatment of heavy metal- containing wastewater.

Research Area(s)

  • Heavy metal, Biogenic FeS nanoparticles, Extracellular electron transfer, Regeneration

Citation Format(s)