Mechanism of reductive oxygen adsorption on active carbons with various surface chemistry

Benzoyl peroxide decomposition on the surface of carbon materials on the base of activated carbon KAU

“…As it is seen in Tables 1-3, substitution of carbon atoms by nitrogen atoms in the sample N-KAU leads to increasing catalytic activity, whereas oxidation (increasing SEC, which characterizes the total amount of surface oxygen-containing groups [35][36][37][38][39][40][41]) significantly reduces the catalytic capability of the sample O-KAU in BP decomposition. Similar dependence was observed in [11,12,41] in the study of H2O2 decomposition by modified carbon materials with nitrogen-and oxygen-containing surface groups.…”

“…A significant reduction of catalytic activity (KM = 1121 mmol/L) of oxygen-containing O-KAU is due to both a decrease in its electron donor capability [37,38] and presence of surface oxygen-containing groups with partical properties [39,40]. During carbon oxidation, as shown in Table 2, mainly carboxylic and phenolic groups are formed on its surface, which can make quite stable H-complexes with peroxide molecule (for the H2O2 molecule it was proved in papers [9,11]) and thus exclude the participation of carbon in the decomposition reaction.…”

“…Hence, we can assume that the mechanism of BP destruction in non-aqueous solutions on the CM surface is identical to the mechanism of hydrogen peroxide degradation in aqueous solution [25,37,38,41].…”

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

“…The similar result was reported by Terzyk et al, who found that the carboxylic groups diminished the oxidative coupling of phenols 9) . The inhibition of activation of dissolved oxygen by HNO 3 oxidation would be due to the electron-withdrawing ability of the acidic functional groups, causing the degradation of electron transfer reaction for activation of dissolved oxygen 13) . This result indicates that the oxidation of AC inhibits the reduction of dissolved oxygen, which would cause the inhibition of dechlorination reaction as observed in this study.…”

Cation-containing active carbons as photocatalysts for dyes degradation

“…Theoretical calculations and experimental measurements show that active carbons can have Eg within 4.8-2.9 eV depending on their origin, chemical composition, and mode of preparation [19][20][21]. These values allow activated carbons to be used as photocatalysts in UV-and visible region.…”