Comment on 'the mechanisms of rate enhancing and quenching of trichloroethene photodecay in the presence of sensitizer and hydrogen sources'

摘要

Recently, Chu and Choy, referred to as CC in this note, proposed a mechanism explaining the photode-gradation kinetics of trichloroethene (TCE) in the presence of acetone (CC suggested as the photosensiti-zer) and triethylamine, TEA, or Brij 35 (hydrogen sources). CC noted the following kinetic elements around which the mechanism was constructed. (ⅰ) Acetone has an optimal concentration from the perspective of rate enhancements, beyond which higher concentrations inhibit TCE reaction rate by acting as a light filter, (ⅱ) There is a characteristic lag period, the length of which depends on solution pH and acetone concentration, that is followed by fast TCE decay; (ⅲ) Overdosing with the hydrogen source has a quenching effect on TCE decay kinetics.