The effects of light intensity, initial concentration, free chlorine, bromine ion and pH value on the photodegradation of dibromonitromethane (DBNM) were studied by single variable control method, and the photodegradation kinetics of DBNM was discussed. The results showed that the photodegradation of DBNM under UV treatment followed first-order kinetics. The photodegradation rate of DBNM decreased with the increasing of initial concentration, increased with the increasing of light intensity and pH value. The presence of bromine ions would slightly promote the photodegradation of DBNM. The addition of free chlorine could significantly accelerate the photodegradation rate of DBNM, and could transform DBNM into the other halonitromethanes (HNMs) which were mainly composed of bromochloronitromethane (BCNM) during the degradation process. The results of this study could provide a reference for controlling the formation of DBNM during water treatment and reducing the risk of water quality safety.
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