Utilizing Photoreduction Process to Anchor Metal on TiO2 for Acid-Odors Removal
Anchoring metal on TiO2 by photoreduction process characterized as adsorbent and photocatalyst is the target in this study. Metal anchored TiO2 is expected to remove acid-odors well at room temperature. Besides the adsorption and absorption mechanism, the material could also decompose the acid-odors by photocatalysis process under UV irradiation. Thus the removal efficiency of acid-odors processed via metal anchored TiO2 could be better than those of the common adsorbent and photocatalyst no matter with or without UV irradiation, the service life of the decontamination via metal anchored TiO2 is also extended more than common adsorbent. According to the comparisons between TiO2 and various porous materials during acid-odors adsorption, Beta type zeolite shows the best efficiency due to the maximum silica-alumina ratio and excellent specific surface area. However, Ag anchored TiO2(Ag-TiO2) via photoreduction process can improve the photocatalysis efficiency of acid-odors; at the same time, Ag on TiO2 surface also reacts with acetic acid in the chemical absorption mechanism with or without UV illumination. The regeneration activation procedure can carry away and desorb the acetic acid from Ag-TiO2. With UV irradiation, the Ag on oxidation state will attract the electrons excited from TiO2, and reduce itself to Ag on metal state, which is reactive to acetic acid; hence, the adsorption and photocatalysis efficiency of acid-odors via the regenerated Ag-TiO2 is similar to brand new ones.
Y. С. Lin et al., "Utilizing Photoreduction Process to Anchor Metal on TiO2 for Acid-Odors Removal", Advanced Materials Research, Vols. 343-344, pp. 188-192, 2012