1 research outputs found
New Insights into the Mechanism of the Catalytic Decomposition of Hydrogen Peroxide by Activated Carbon: Implications for Degradation of Diethyl Phthalate
This
study investigated the catalytic decomposition of H<sub>2</sub>O<sub>2</sub> by activated carbon (AC) and its implications for
degradation of diethyl phthalate (DEP). It was found that AC exhibited
excellent catalytic ability for decomposition H<sub>2</sub>O<sub>2</sub> and degradation of DEP. HNO<sub>3</sub> modification altered
the surface characteristics of AC together with the concentrations
and types of AC free radicals (FRs), which further promoted generation
of <sup>•</sup>OH. Positive correlations were found between
FR concentration and generation of <sup>•</sup>OH (<i>R</i><sup>2</sup> = 0.856) and between the proportion of surface-bound
hydroxyl groups (C–OH) and the decomposition rate of H<sub>2</sub>O<sub>2</sub> (<i>R</i><sup>2</sup> = 0.776), indicating
that FRs in AC were the main contributor to <sup>•</sup>OH
generation, whereas C–OH groups were predominantly responsible
for decomposition of H<sub>2</sub>O<sub>2</sub>. Electron capturing
studies demonstrated that the decomposition reaction likely involves
the transfer of FR electrons to H<sub>2</sub>O<sub>2</sub> to induce
formation of <sup>•</sup>OH