Debromination of hexabromobenzene by its co-grinding with CaO

Qiwu Zhang, Hiroki Matsumoto, Fumio Saito, Michel Baron

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


A hexabromobenzene (HBB, C6Br6) powder was subjected to co-grinding with excess CaO powder in air using a planetary ball mill to investigate mechanochemical debromination of the HBB sample. The reaction proceeds smoothly with an increase in both grinding time and molar ratio of CaO addition. The co-grinding enables us to debrominate HBB, forming CaBr2, C and CaCO3 besides excess CaO in the product. CaBr2 in the product tends to absorb moisture from the atmosphere to form CaBr2 · nH2O. The reaction yield is quantitatively evaluated by measuring the amount of water-soluble bromide through water washing and the amount of unreacted HBB through toluene washing. It is found that almost 100% of debromination is achieved by 6 h grinding with the molar ratio kept constant at 2:1. Radicals are detected in the ground products, possibly due to rupture in the covalent bonds of C-C and C-Br in HBB.

Original languageEnglish
Pages (from-to)787-793
Number of pages7
Issue number8
Publication statusPublished - 2002
Externally publishedYes


  • Bromide
  • Fire retardant
  • HBB
  • Mechanochemistry
  • Radical

ASJC Scopus subject areas

  • Environmental Engineering
  • Chemistry(all)
  • Environmental Chemistry
  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis


Dive into the research topics of 'Debromination of hexabromobenzene by its co-grinding with CaO'. Together they form a unique fingerprint.

Cite this