Radicals in the mechanochemical dechlorination of hazardous organochlorine compounds using CaO nanoparticles

Tadaaki Ikoma, Qiwu Zhang, Fumio Saito, Kimio Akiyama, Shozo Tero-Kubota, Tatsuhisa Kato

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

For the first time, we detected paramagnetic products generated during the grinding of 3-chlorobiphenyl (BP-Cl) with calcium oxide (CaO) nanoparticles by a ball mill method, which is one of the promising ways to detoxify hazardous chlorinated organic compounds. Those products were assigned to oxygen-centered aromatic radicals coming from BP-Cl and trapped electrons in oxygen vacancies on the surfaces of the CaO reactants using high-frequency and pulsed electron paramagnetic resonance spectroscopies. The observed good correlation between the dechlorination efficiency and the radical yield suggests that a radical mechanism plays an important role in the destruction of organochlorine compounds. The mechanochemical dechlorination could be interpreted by the following mechanism. First of all, the mechanical stressing induces the electron transfer from O 2- sites on the surface of the CaO particle to the organic compounds. The produced organic anion radicals then undergo the effective self-dissociation of a chlorine-carbon bond.

Original languageEnglish
Pages (from-to)2303-2309
Number of pages7
JournalBulletin of the Chemical Society of Japan
Volume74
Issue number12
DOIs
Publication statusPublished - 2001 Dec

ASJC Scopus subject areas

  • Chemistry(all)

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