||For indoor air purification caused by decorating, many products have been developed for indoor and outdoor air purification applications, which became one of the most popular photocatalyst products. Photocatalyst carried out by UV irradiation photocatalysis. Oxygen or water molecules converted into highly reactive hydroxyl radicals (OH‧) and negative oxygen ions (O2¯). These two oxidants have powerful oxidizing ability, which can effectively decompose volatile organic compounds (VOCs) detrimental to human health, and inhibit the breeding of germs, purify the air quality, and have the capability of self-cleansing and deodorization. It also has environmental benefits of low energy consumption and high removal efficiency.|
In recent years, environmental loading is increasing with the domestic economic take-off and the rapid development of urbanization, which gradually leads to the serious environmental problems. At the same time, people's environmental awareness is steadily growing with the level of environmental pollution and the requirement of indoor air quality is also rising. Indoor air quality management approach promulgated by the President in November 23, 2011 and formally implemented on November 23, 2012. The Republic of China becomes the second country to promote indoor air quality management legislation after South Korea. It contributes that the outdoor based air pollution control strategies in the past extends to the indoor air quality management in public places and causes more people focus on the issue of indoor air pollution.
This research attempts to use industrial grade materials by sol-gel and thermohydrolysis method to prepare visible light induced nano-sized titanium dioxide visible light photocatalyst. By the addition of Fe2+ or Ag+ modified photocatalyst doped with two different metals, and used different amounts of visible light photocatalyst with coating preparation. UV-visible absorption results indicated that the photocatalyst absorbance increased with the amount of metal addition, and the optical absorption band spanded and moved toward the visible absorption region (i.e. red-shift phenomenon). This research attempted to use a modified powder dispersed photocatalyst painting made by nano technology. Testing for photocatalytic decomposition of methylene blue solution as the basis for evaluating the photocatalytic reactivity. Finally, this research compared the absorbance of modified photocatalyst and the decomposition efficiency of methylene blue for different complex photocatalysts. Comprehensive assessment of the modified photocatalyst absorbance and methylene blue decomposition efficiency, choose the most suitable dosage of metal added to TiO2.
The results of visible light photocatalytic degradation of methylene blue efficiency about TiO2, Ag/TiO2 and Fe/TiO2 photocatalyst coatings. Photocatalytic decomposition of iron-doped metal does have greatly improved the efficiency and the more metal-doped iron ratio of photocatalytic decomposition efficiency is better. Metallic silver doped photocatalytic decomposition efficiency has also improved significantly, the proportion of metallic silver doped particular 1% Ag/TiO2, 4% Ag/TiO2 and 5%Ag/TiO2 get the best photocatalytic degradation efficiency of methylene blue. Comparison of photocatalytic TiO2, Ag/TiO2 and Fe/TiO2 powder and paint degradation of methylene blue efficiency analysis results, photocatalyst nano powder through the dispersion. Photocatalyst photocatalytic effect than those without good dispersion and degradation of Methylene Blue effects can be fully apparent.