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New materials for air purification will come out soon
2017-03-10722
According to the expert's appraisal, the metal organic skeleton compound material can be applied to air filtration. The filtration rate of PM2.5 is as high as 99.5% at room temperature, and the purification efficiency will be slightly damaged only at 200 ℃. According to experts, this technology will be used in civil filter equipment, filter elements and other products, and it is expected that products will come out this year.
It is worth noting that at present, the air purification industry is still immature, with a large number of brands, but some small-scale enterprises have been eliminated from the market, and the number of brands entered has decreased year by year, and the industry concentration has increased year by year. "What's more, the lack of technological innovation in the air purification industry and the slow upgrading of products have always been the industry consensus."
MOF is a kind of atom level compound of new inorganic material and organic polymer monomer. This kind of material has developed nano channels, and the channel of unit MOF material is 1.12 nm. The three-dimensional network frame structure formed by polymerization of a large number of units of MOF has a relatively large specific surface area and can be used to store a large number of gas molecules. Different types of gas molecules can be further screened by adjusting the pore size, shape and structure
So, how does this new material achieve PM2.5 and harmful gas capture and degradation?
Taking PM2.5 as an example, it is essentially an aerosol containing liquid, volatile organic compounds (VOC) and solid. The new material developed by Wang Bo's team will first capture PM2.5 with MOF's own static charge, and the basic functional group will capture liquid molecules and VOC into the pore channel. In this way, through the filtration of MOF membrane, only solid components remain on the surface of the membrane, and only water is needed for cleaning.
According to reports, experts have been studying MOF materials for 13 years, and it has been 6 years since MOF materials were successfully developed into films. "When the material is below 50 nanometer level, the polymerization will form new characteristics. We have spent a lot of time studying all kinds of properties. At present, MOF films can be attached to different substrates such as textiles, foams and plastic materials in the way of growth." Experts said that the air permeability and service life of MOF membrane are better than those of non-woven fabric, electrostatic fabric, HEPA, composite glass fiber, activated carbon and other filter screen materials commonly used on the market.
"Generally speaking, in the market, the filter efficiency is generally improved by increasing the thickness and density of the filter screen, but at the same time, the air permeability will be greatly reduced. The change of material air resistance will make the air purifier generate huge noise and further affect its service life." "In fact, this is a balanced process. What we have achieved is to ensure its high purification rate and improve air permeability as much as possible, so as to reduce energy consumption, extend the service life of equipment, and solve the noise problem that has been criticized by people all the time," Wang explained It is understood that the filter screen made of MOF material reduces the air resistance from 200Pa to 30Pa. If the material is successfully applied to the production of air purifier filter screen, the service efficiency and service life of air purifier will be greatly improved.
In addition, TiO2 is often used as photocatalyst in the market for the degradation of harmful gases. It takes more than 12 hours for the catalytic degradation of this kind of material to occur, and it needs to be under the UV condition to ensure the normal degradation. "But the cost of UV is relatively high, so our team spent a lot of time to solve the problem of reaction conditions. At present, this kind of material can catalyze the degradation of harmful organics in sunlight, and the reaction rate is faster than other photocatalysts."
Industry competition pattern is uncertain
However, it is undeniable that the manufacturing cost of MOF materials is higher than other materials on the market. In addition, the air purification industry is still a multi competitive pattern, which undoubtedly increases the difficulty for the commercialization of MOF membrane.
At present, the air purification market has become hot again due to the haze problem, but for a long time, the price difference between the filter element and the finished air filter product is very large. "In fact, in order to promote their products, major manufacturers have spent a lot of money on channel promotion and product marketing, and the cost of filter element is about 20% of the total cost." Therefore, although the production cost of new materials is relatively high, there is still considerable profit space to develop the market.
"The exaggerated advertising marketing strategy makes the public's cognition of air purification products deviate from the actual effect, which also increases the uncertainty of new materials entering the market." According to the above-mentioned employees of Fujian environmental protection enterprises, although the air purification industry has eliminated a number of unqualified brands in the past two years, the number of brands in the industry is still large, and the competition pattern is still unclear.
From the data, in 2015, there were 1006 brands in theory, 883 brands were actually sold, and 123 brands were eliminated; in 2016, there were 982 brands in theory, 714 brands were actually sold, and 268 brands were eliminated. Predictably, the air purification industry is intensifying the reshuffle.
In fact, the lack of technological innovation still hinders the further development of air purification industry. In 2016, the contribution of the retail sales of the purifier models listed on the market was mainly the models listed in 2014 and before, and only about a quarter of the models listed in 2016.
"Relevant parameters and standards of the industry need to be further improved so as to promote technological innovation." Wang Bo believes that at this stage, with a batch of products with technical content pouring into the market, the products with MOF as the filter screen material in the future will rely on
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