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The role of nano-TiO2 photocatalytic degradation in air purification
At present, environmental pollution is becoming more and more serious in some places, and the purification of harmful gases has been paid more and more attention. Nano-TiO 2 photocatalytic degradation technology provides a good and effective way to solve this problem. Environmentally harmful gases can be roughly divided into two aspects, indoor harmful gases and atmospheric pollutant gases.
1 Indoor harmful gases, mainly formaldehyde released from decorative materials and methyl mercaptan, hydrogen sulfide, ammonia, etc. produced in the living environment. These materials adsorbed on the surface thereof are oxidized and decomposed by photocatalysis of nano-TiO 2 to reduce or remove these substances. Studies have shown that coating nano-TiO 2 photocatalytic film on the surface of building materials, office glazing, ceramics and other building materials or placing nano TiO 2 photocatalytic equipment in the room can effectively degrade these substances and purify indoor air.
2 Air pollution is mainly caused by nitrogen oxides and industrial waste gas from automobile exhaust gas. The photocatalytic action of nano-TiO 2 can oxidize these gases to form nitric acid or sulfuric acid with low vapor pressure, which can be used during rainfall. It is removed, and the neutralization of rainwater through atmospheric dust is almost non-acidic, thus achieving the purpose of purifying the air. In 1989, General Motors of Japan studied the ability of nano-TiO 2 to remove sulfur from simulated automobile exhaust gas (including H 2 S). The total sulfur content removed by the researchers from simulated automobile exhaust gas after 5 hours at 500 ° C is more than all tested. The amount of conventional TiO 2 removal is 5 times greater. More importantly, the rate of removal of sulfur by nano-TiO 2 is still quite high after 7 h of exposure. It has been proved that nano-TiO 2 can be used repeatedly for at least 12 times, while maintaining the photodegradation efficiency is basically unchanged, and maintaining its photoactivity under continuous light for 580 minutes, and the practical application prospect is broad.