关键词: 活性炭, 表面化学改性, 石脑油, 有机氯化物

Abstract: The oxidative modification of activated carbon was carried out using HNO3 and H2O2 respectively. The performance of adsorbing organic chloride in naphtha of the modified activated carbon samples was investigated. Boehm titration, FT-IR, BET method and micro coulometry were involved in the analysis and characterization of surface functional groups, pore structure and chlorine content. Results showed that the acidity of the modified activated carbon was increased by the increase of acidic surface groups (carboxyl, lactone and hydroxyl); its performance of adsorbing organic chloride could be enhanced with the increase of temperature. An organic chloride removal rate of 96.6% was obtained at 350℃ with a 5% H2O2 modified activated carbon. Severe oxidation could result in stronger surface acidity yet the adsorption capacity of the modified activated carbon did not increase significantly due to the microstructure collapse.

Key words: activated carbon, chemical modification of surface, naphtha, organic chloride