| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 100 === This research used self-made zeolite with silver catalyst (Ag/zeolite) as the filter of air cleaner to improve the air quality of respiratory care wards at a hospital in Chiayi County. The purposes were to reduce indoor pollutants and to investigate the correlation with the physical and chemical properties of zeolite. The Taguchi Method was used to analyze the optimal conditions for removing pollutants.
In this study, TEM, SEM, ICP-OES, FT-IR, XRD, BET and zeta potential were used to identify materials’ characterization. The Ag2O partials on zeolite surface were observed by SEM and TEM. The particle size of zeolite is about 40-60 nm. The acid digestion and ICP-OES was used to analyze the contants of silver of composite material (about 0.078 wt %). The XRD results also showed that the peak of Ag2O but it found SiO2 crystal lattice were reduced due to the existence of silver catalyst. The FT-IR spectrum was confirmed the Si-O-Si and OH functional groups existing on the surfaces of composite materials. The oxides of silica and alumina were one material those have two isoelectric points and the later one would reduce from pH 8.5 to pH 7.5 after using-probably changing electric propertion after adsorting bioaerosol.
This research used zeolite to improve air quality in hospital with the Taguchi Method. The Orthogonal Experimental Design L9 (34) of four factors: air cleaner, type of zeolite, weight of zeolite and number of people at ward were tested. The purpose is to remove pollutants, including formaldehyde, volatile organic compounds, CO2, CO, O3, bacteria and fungi. The optimal conditions of experiments for removing CO2 were one air-cleaner, recycled silver zeolite, zeolite 250 g, of two patients at ward and the removal efficiency was up to 39%. The optimal conditions for removing bacteria were determined to be three air-cleaners, pure zeolite, zeolite 250 g, one patient at ward and the removal efficiency was 82%. The optimal conditions to remove fungi were determined to be two air-cleaners, silver zeolite, zeolite 150 g, of one patient at ward and the remove efficiency was up to 85%. The removal efficiencies for bacteria and fungi by filters were significant.
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