Transformation of carbon tetrachloride in the presence of sulfide, biotite, and vermiculite

Article Abstract:

The influence of sheet silicates and sulfide on the mechanism of carbon tetrachloride transformation are discussed. Biotite, vermiculite and muscovite were chemically analyzed to determine their temperature and acidity dependence, the effects of solid and sulfide concentration and the effect of sheet silicate components. Results indicate that carbon tetrachloride is transformed more rapidly in the presence of biotite and vermiculite than in homogenous systems.

Testing, Surface chemistry

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Transformation of carbon tetrachloride by reduced vitamin B12 in aqueous cysteine solution

Article Abstract:

Carbon tetrachloride (CCl4) is a chlorinated pollutant widespread in groundwater and soil. Studies suggest that the most effective biodegradation mechanism involve transformation of the pollutant in cysteine solution containing a catalytic agent such a reduced vitamin B12. This mechanism proceeds in two consecutive phases: slow or initial phase and fast or rate-limiting step. A detailed mechanistic model for the cysteine-B12-CCl4 system is discussed.

Models, Biodegradation, Hydrocarbons

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Metallocoenzyme-mediated reductive transformation of carbon tetrachloride in titanium(III) citrate aqueous solution

Article Abstract:

The reduction mechanisms and the kinetics behind reductive dechlorination reactions mediated by cobalamin or iron porphyrin in titanium(III) citrate solution were investigated. The results showed that the concentration and reducing power of the reducing agent had a strong influence on CCl4 transformation rate and chloroform yield. The reducing agent also had an impact on the rate and the product distribution.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Carbon Tetrachloride, Oxidation-reduction reaction, Oxidation-reduction reactions

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