In the ClO2 oxidation of organic contaminants, second order
kinetics has generally been observed [10,11,34]. However, in some
cases, the decay of ClO2 might follow the mixed-order or
second-order kinetics [35,36]. Initially, the experiments were conducted
at pH 7.0 and 298 K to determine the rate law of the
410 Y. Wang et al. / Chemical Engineering Journal 279 (2015) 409–415
reaction between ClO2 and DCF. The rate expression for the reaction
of ClO2 with DCF may be described as the following equation: