Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO3- reduction

Shanawar Hamid, Damira Abudanash, Seunghee Han, Jong Kim, Woojin Lee

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The reduction of bromate to bromide was successfully achieved by bimetallic catalysts with NZVI support in continuous-flow reactors. The stability of NZVI-supported bimetallic catalysts was enhanced by decelerating the iron corrosion and sequential rapid passivation of the iron-Cu-Pd ensembles under optimized reaction conditions. Thus >99% bromate removal can be continuously achieved for 11 h. The lifetime of the bimetallic catalyst was further enhanced and tested under different hydraulic retention time, catalyst loading, and initial bromate concentrations. At the optimized operation conditions, the catalyst showed a complete bromate reduction by 24 h and then the reactivity slowly decreased to 20% over the next 100 h. X-ray diffraction and X-ray photoelectron spectroscopy showed that the reactive NZVI support was oxidized to Fe(II) and Fe(III) along with Cu(0) oxidation to CuO, while the oxidation state of Pd did not change. Therefore, bromate reduction occurred on the surface of reactive NZVI support and Cu(0) particle, while Pd played a role as a hydrogenation catalyst that prolonged the lifetime of the bimetallic catalyst.

Original languageEnglish
Pages (from-to)714-725
Number of pages12
JournalJournal of Environmental Management
Volume231
DOIs
Publication statusPublished - Feb 1 2019

Keywords

  • Bimetallic catalyst
  • Bromate reduction
  • Catalyst stability
  • NZVI
  • NZVI-Cu-Pd

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

Fingerprint

Dive into the research topics of 'Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO3- reduction'. Together they form a unique fingerprint.

Cite this