Utilizing Photoreduction Process to Anchor Metal on TiO2 for Acid-Odors Removal

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 343-344)
• Pages: 188-192
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.343-344.188
• Online since: September 2011
• Authors: Yu Сhih Lin, Chung Liang Chang, Che Wei Mei
• Keywords: Adsorbent, Chemical Filter, Deodorization, Photocatalyst

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