A drastic increase in the dye decomposition activity of OMS-2
materials observed with raising temperature suggests a swelling
effect produced within the internal structure of the catalyst
enabling a large amount of dyes as well as TBHP molecules to
penetrate through the tunnels and internal pores of the catalysts.
Frequent interaction between MB dye, TBHP, and active sites
of the catalyst therefore increased the decomposition of the dye.
Increased activity on raising temperature implies that the
enthalpy change has a positive value. This indicates that the
decomposition of MB was endothermic, which opposes the
argument of possible exothermic adsorption and strongly
supports the oxidation of the dye by OMS-2 catalysts.