Is the UV sterilizer box really useful?

At the beginning of 2020, a sudden new coronavirus (called the 2019-nCoV ARD in the recent Nanshan team's paper, Acute Respiratory Disease of New Coronavirus) has spread at an unprecedented rate around the world, causing panic. People are buying masks and disinfecting water in large quantities. , Alcohol, and of course the uv sterilizer box.

According to the newly released [Quick Guide for Diagnosis and Treatment of New Coronavirus Pneumonia", 75% alcohol, ether, chloroform, formaldehyde, chlorine-containing disinfectants, peroxyacetic acid, and ultraviolet light can inactivate viruses (17 years ago during the SARS ultraviolet disinfection box Also sold out). Many uv box sterilizer companies are now working overtime to support Wuhan. However, due to insufficient supply of upstream material manufacturers and limited output, they can only come slowly

Perhaps many ordinary consumers feel that the family cannot use the sterilizer box, which is unnecessary. In fact, we live in a ubiquitous environment of bacteria, in the air, in the corner of the kitchen, on the toilet, on the desktop, on the mobile phone, on the clothes... are viral bacteria that we can't see with the naked eye. It is still necessary to disinfect with uv box sterilizer regularly. It is better than spraying the corner of the alcohol/disinfectant and spraying it repeatedly. It is said to prevent colds. After all, most of our colds are caused by the invasion of viral bacteria.

The principle of ultraviolet sterilization uses UVC ultraviolet rays (mainly 240 nanometers to 280 nanometers) with bactericidal effect to destroy the molecular structure of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) of microbial cells, resulting in growing cells and (or) regeneration Sex cells die to achieve the effect of sterilization and disinfection.

Don`t worry too much about what kind of germs it can kill, anyway, it can kill most bacterial viruses including this new coronavirus (you don`t know what kind of bacterial virus exists in your home, this seems to be no real-time instrument Detected, some germs can not be killed), in short, whether good or bad will be eliminated.

All coronaviruses are single-stranded positive-strand RNA viruses. So how does the sanitizer box emit UVC ultraviolet rays? At present, there are two main light sources for the sterilizer box-gas discharge light source and solid state light source. The gas discharge light source is mainly a low-pressure mercury lamp. The principle of luminescence is the same as that of the fluorescent lamp we used before, which excites mercury atoms in the lamp tube. The low-pressure mercury vapor mainly produces 254 nm UVC ultraviolet radiation (radiation efficiency 30%~60%) and 185 nm UVD ultraviolet radiation (radiation efficiency 5%~15%) ).

As mentioned above, UVC ultraviolet sterilization is the most effective, but ultraviolet rays can only spread in a straight line, and the penetration is weak, so there is a blind spot for disinfection that is blocked. Although the 185 nm UVD does not have strong physical sterilization and disinfection, it can decompose oxygen in the air to generate ozone. Ozone has a strong oxidation effect and can reach all corners with air flow to completely sterilize and disinfect (biological Chemical oxidation sterilization). However, high ozone concentration is harmful to the human body and can cause chest tightness and dizziness. Therefore, if you purchase a sterilizer box with ozone, you need to open the window to ventilate for 30 to 60 minutes after sterilization.