In recent years, the most popular topic of decoration is that the pollution ratio of decoration is sicker and life-threatening. With the frequent incidents, in addition to the traditional ventilation and plant absorption, the most direct way to deal with the rest is to find a professional company for effective governance.
With the development of Internet communication, most people are discussing whether the "Photocatalyst" used by enterprises will cause secondary pollution on the Internet, wechat and other social software, which makes consumers fall into a state of panic and worry.
So, what kind of material is photocatalyst
What problems can be solved in the application field? To this end, we combine relevant experts and industry summary:
Photocatalyst: the combination of light and catalyst. Photocatalyst is the general name of nano-TiO2 photo sensitizing material, which has the function of photocatalysis and is the most ideal indoor air pollution control drug material in the world. This reaction does not produce "secondary pollution". In addition, the photocatalyst has a long use time and low maintenance cost. TiO2 is a kind of pollution-free, non-toxic and safe environmental treatment material.
When the photocatalyst TiO2 is excited by light, the valence band (VB) electrons transition to the conduction band (CB) through the static band, thus accumulating electrons (E -) in the conduction band, forming photogenerated holes (H +) in the valence band, realizing the separation of electrons and holes. Oxygen or water molecules can be excited into superoxide radicals (o? · -) and hydroxyl radicals (? Oh) and other radicals with strong oxidation. Therefore, it is often used to degrade organic pollutants in the environment.
Japan has always been in the forefront of technology and market in the research and development of photocatalytic air purification equipment, and is a leading country in photocatalytic technology.
In 1972, Japanese scholars Fujishima and Honda first reported that titanium oxide was used as photocatalyst to decompose water to produce hydrogen. After that, people continue to study nano-TiO2 photocatalysis materials, and find that nano-TiO2 has a strong application value in wastewater and waste gas purification, light energy conversion, antibacterial deodorization and other fields.
So far, the technology of photocatalytic purification of indoor air is still developing, but Japan is still the main one. In recent years, most of the patents applied in this field are composite products of adsorption and photocatalysis, some of which have the functions of purifying indoor air and regulating temperature.
In Japan, anti pollution, antibacterial, hydrophilic materials and other aspects have reached the practical level, and formed a large-scale sex industry. In recent years, China has been introducing Japanese high-tech products and developing new indoor air purification products, but there is still a big gap with Japan.
Photocatalytic technology can not only eliminate indoor toxic and harmful gases, but also eliminate the pollution of greenhouse gases to the atmosphere. At present, photocatalysis can degrade more than 2000 kinds of refractory substances rapidly and effectively. In particular, in the field of indoor air pollution purification, the electrons and holes generated by titanium dioxide light excitation, and then the strong oxidation free radical reaction can mineralize the volatile substances such as formaldehyde and benzene in the room, form H2O and CO2, and do not produce "secondary pollution" in the middle, which is why the photocatalyst will not produce secondary pollution. This is also an effective measure to solve indoor environmental pollution.