| 초록 |
Today,most people living in industrial regions, particularly during the colder months, spend 90% of their time in closed rooms with only short airing period1. Moreover, in the sixties and seventies, materials containing unhealthy substances were used uncritically, creating sources of long-term emission. Building products, furnishings and household commodities often emit volatile chemical compounds. Mostly these are so-called volatile organic compounds(VOC), or semi-volatile organic compounds(SVOC). Solvents , residual monomers, plasticizers, fire-proofing agents, auxiliary agents for processing, preservatives(biosides), and reaction or decomposition products are responsible for the occurrence of these emissions. Well-known examples are formaldehyde(emissions from wood-based materials), pentachlorophenol and its water-soluble sodium salt(wood preservatives) and polychlorinated biphenyls(insulating materials) and Carbon monoxide(CO) as a indoor contaminants2. Especially, Carbon monoxide (CO) among above examples is becoming a growing concern because of a quality of life. Carbon monoxide (CO) is a colorless, odorless, and tasteless gas. It results from incomplete oxidation of carbon in combustion. Incomplete oxidation during combustion in gas ranges and unvented gas or kerosene heaters may cause High concentrations of CO in indoor air3. In comfort and health effect on CO, acute effects are due to the formation of carboxyhemoglobin in the blood, which inhibits oxygen intake. At moderate concentrations, angina, impaired vision, and reduced brain function may result. Therefore, CO exposure can be fatal at higher concentrations. Gold catalysts have recently been attracting rapidly growing interests due to their potential applicabilities to many reactions of both industrial and environmental importance such as indoor air purification(especially CO oxidation)4. The Oxidation of CO on TiO2 supported gold has been carried out both in a constant pressure static and a closed system with photo-electro-catalytic system. Photo-electric-catalytic system was composed of UV lamp(Power 10W), plate for photocatalyst coating and electron emitting instrument for excited ion. TiO2 supported gold with 1wt% loading was prepared by photo-reduction and deposition precipitation method5, respectively. |
