Oxidation of Activated Carbon in Liquid Phase. Study by FT-IR

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Abstract
Surface chemistry of a commercial activated carbon (AC) and of products oxidized in liquid phase using aqueous solutions of a series of oxidizing agents (H2SO4, HNO3, HClO4, H2O2, O3, ClO2, KlO4 and KMnO4) has been studied by FT-IR. Oxidation led to surface groups and structures which, and also the extend of formation, depended on the oxidizing agent and the pH and concentration of the solution used. Most oxidizing agents proved to be effective for the formation of surface C[dbnd]O groups. Variations in pH of solutions of H2O2, KlO4 and KMnO4 unequally affected the oxidation of AC. This was unfavourable with the increase in concentration of the solutions of HNO3 and KMnO4. The reverse was noted with KlO4.