| 초록 |
In this study, new activated carbons (ACs) were prepared by anodic oxidation treatment to remove ammonia gas. The chemical solutions used in this experiment were sodium hydroxide and phosphoric acid. The acid- and base values were determined by Boehms titration method. And, the surface properties of ACs were investigated by FT-IR and XPS analyses. Also, N2/77K adsorption isotherm characteristics, including the specific surface area and micropore volume were studied by BET and t-plot methods, respectively. The ammonia removal efficiency was confirmed by gas-detecting tube technique. As a result, it was revealed in the case of acidic treatment on ACs that the ammonia removal was more effective due to the increase of OH groups in ACs surfaces without any particular changes of adsorption isotherm characteristics. However, in the case of basic treatment, the ammonia removal was slightly effective due to the increase of oxygen functional groups in ACs surfaces in spite of decreasing the BETs specific surface area. Therefore, it was found that acidic anodization of ACs was a suitable method for the removal of ammonia, which was attributed to the increase of oxygen functional groups containing phenol groups in ACs surfaces.
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