Because of the formation of nonabsorbing intermediates, we expect to see a faster decrease in absorbance than TOC. Although UV-irradiated TiO2 is effective toward degradation of intermediate carboxylates, their relative rate of oxidation is slow.74,75 The smaller RGO fragments eventually mineralize to CO2 and H2O over long periods of irradiation of TiO2/RGO suspensions. Nearly 75% decay in TOC is seen following 2 h of UV irradiation. Continual evolution of OH• radicals during UV excitation of TiO2 enables the decrease in TOC. The OH• radical-induced oxidation of RGO leading to mineralization is illustrated in Scheme 1.