The degradation of 1,2,4-trichlorobenzene using synthesized Co3O4 and the hypothesized mechanism
In: Journal of hazardous materials, Jg. 192 (2010-11-26), Heft 3
Online
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Zugriff:
Co3O4 was synthesized with cabbage-like, plate-like and sphere-like morphologies. The effect of different morphologies on the degradation of 1,2,4-trichlorobenzene (1,2,4-TrCB) was evaluated, and the cabbage-like Co3O4 exhibited the highest reactivity. The degradation of 1,2,4-TrCB on the cabbage-like Co3O4 is hypothesized to act competitively via hydrodechlorination and oxygen-attacking pathways. By the hydrodechlorination pathway, 1,2,4-TrCB is successively dechlorinated into the three dichlorobenzenes (DCBs) and then monochlorobenzene (MCB). The yield of the DCBs was in the order of p-DCB > m-DCB > o-DCB, which can be explained by the calculated C–Cl bond dissociation energies in 1,2,4-TrCB and DCBs. Derivatization and electron spin resonance experiments identified that lattice oxygen and superoxide anions may take part in the oxidation pathway. The lattice oxygen initiated a partial oxidation of 1,2,4-TrCB, leading to the formation of chlorinated phenols. The superoxide anions caused ring-cracking oxidation of 1,2,4-TrCB, possibly producing some low-molecular-weight products, thus explaining a mass imbalance in the chlorine atoms and total organic carbon.
Titel: |
The degradation of 1,2,4-trichlorobenzene using synthesized Co3O4 and the hypothesized mechanism
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Autor/in / Beteiligte Person: | Zheng, Minghui ; Qi, Chuansong ; Su, Guijin ; Li, Wei ; Jia, Manke ; Lin, Shijing |
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Zeitschrift: | Journal of hazardous materials, Jg. 192 (2010-11-26), Heft 3 |
Veröffentlichung: | 2010 |
Medientyp: | unknown |
ISSN: | 1873-3336 (print) |
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