Photo-oxidation of an endocrine disrupting chemical o-chloroaniline with the assistance of TiO2 and iodate: Reaction parameters and kinetic models

An efficient photo-oxidation system was introduced to decay a typical endocrine disrupting chemical o-chloroaniline (o-ClA) by using UV light with the assistant of TiO2and IO3-(UV/TiO2/KIO3system). The o-ClA decay in UV/TiO2/KIO3system is much superior to sole UV and UV/TiO2. For depth evaluating the system, the effect of TiO2dosages, KIO3dosages, and initial pH levels ([TiO2]0, [KIO3]0and pH0) were investigated and optimized. The optimum o-ClA decay was achieved at [KIO3]0of 66.7mg/L and pH0of 7.09. The kinetics analysis showed that the o-ClA decay followed a two-stage pseudo first-order, and the decay rate constants at both stages (k1and k2) are significantly influenced by [TiO2]0, [KIO3]0and pH0. After data analysis, both 1/k1and 1/k2were found linearly correlated to [KIO3]0, pH0and 1/[TiO2]0. Mathematic models were therefore derived for predicting o-ClA decay in terms of [TiO2]0, [KIO3]0and pH0. Moreover, the proposed models offered efficient approaches to predict the o-ClA decay in UV/TiO2/KIO3system under various conditions.