Bromide Ions Specific Removal and Recovery by Electrochemical Desalination

Environ Sci Technol. 2018 Jun 5;52(11):6275-6281. doi: 10.1021/acs.est.8b00282. Epub 2018 May 22.

Abstract

Removal and recovery of bromide ions by electro-oxidation and electro-reduction are presented using hybrid physical adsorption and capacitive deionization cells, which contain activated carbon cloth electrodes. This is a proof of concept research with results, which indicate that when comparing the removal and recovery quantities of bromide and chloride ions (starting with the same initial concentration of 0.05 M for both salts), the desalination capacity of the bromide ions is larger by almost 2 orders of magnitude than that of the chloride ions; thus, we obtained specific desalination of bromide ions from a solution containing chloride ions. Removal and recovery of 3.5 mmol of bromide ions were achieved by a working electrode with 1 g of activated carbon cloth, and the calculated energy consumption for the removal and recovery of 1 g of bromide ions was about 2.24 kJ/g.

MeSH terms

  • Adsorption
  • Bromides
  • Charcoal
  • Electrodes
  • Ions
  • Water Purification*

Substances

  • Bromides
  • Ions
  • Charcoal