Ammonia removal of activated carbonstreated by anodic oxidation

摘要

In this study, a new microporous carbon was prepared by anodic oxidation treatment to remove ammonia gas. Thernelectrochemical solutions used in the electrolytes were phosphoric acid and sodium hydroxide to investigate the roles ofrnacidic and basic treatments, respectively. The surface properties of microporous carbons were investigated Boehm’srntitration, FT-IR, and XPS analyses. Also, N2/77K adsorption isotherm characteristics were studied by BET and t-plotrnmethods, respectively. The ammonia removal efficiency was confirmed by gas-detecting tube technique. As a result, itrnwas revealed in the case of acidic treatment on microporous carbons that the ammonia removal was greatly effective duernto the increase of OH groups in carbon surfaces without any significant changes of microstructural properties. However,rnin the case of electrochemically basic treatment, the ammonia removal was slightly effective, due to an increase ofrnoxygen functional groups in carbon surfaces in decreasing of the specific surface areas or micropore volumes.