This paper reports an improved chlorolignin (CL) oxidative decolorization in alkaline media by the use of a heterogeneous
system consisting of hydrogen peroxide and a silica [bis(dibenzoylmethido) copper II] (S1) catalyst. The catalytic functions of S1
in the presence of H2O2 were evaluated by comparing the chlorolignin decolorization in media with and without addition of
catalyst. Since decolorization is associated with CL degradation, the pH variation and chloride release assays were carried out to
monitor both processes. The influence of several factors such as H2O2 and chlorolignin concentration, initial pH, reaction time,
temperature, and catalyst dose were assessed to improve the catalytic reactions. Also, the stability and potential reusability of the
catalyst were studied. It was found that the oxidative reaction follows pseudo-first order kinetics with respect to chlorolignin
concentration. Activation energy, as well as activation enthalpy and entropy, were calculated using the Arrhenius and Eyring
equations, respectively.