The influence of surface chemistry of activated carbons on the selective decomp...

• Author(s): Ribeiro, Rui ; Silva, Ádrian ; Figueiredo, José ; Faria, Joaquim ; Gomes, Helder
• Date: 2013
• Persistent ID: http://hdl.handle.net/10198/8889
• Origin: Biblioteca Digital do IPB
• Subject(s): Hydrogen peroxide decomposition; Hydroxyl radicals; Sulphur and nitrogen containing groups; Basic carbons
• Document Type: Conference Object
• Language: English

Description

Activated carbons can act as metal free catalysts on wet peroxide oxidation to generate the highly reactive HO• by means of H2O2 decomposition. To quantify the yield of HO• formed during the process (YHO•) the consumption of H2O2 and the oxygen formation were measured in experiments performed with and without an HO• scavenger. After 150 min of reaction, at T = 323 K, pH = 3 and catalyst load = 0.1 g L-1, the highest YHO• was obtained for the catalyst with higher surface basicity, obtained from the successive modification of the original activated carbon with nitric acid oxidation, hydrothermal treatment with urea and gas-phase thermal treatment under a N2 flow. A linear correlation between YHO• and the concentration of basic active sites at the carbons surface was obtained.