Theoretical description of hydroxyl purifier

1、 Hydroxyl radicals existing in nature

1. Professor Paul Crutzen, a Nobel laureate in chemistry and world pioneer in atmospheric chemistry, coined the term "atmospheric cleaner" to describe the important cleaning role of hydroxyl radicals (OH *) in the troposphere. He pointed out that OH * is the most important oxidant in the troposphere, which can oxidize most trace gases found in the troposphere into water-soluble products (CO2 and H2O), which are then washed away by rain and snow.

2. In the troposphere, in the presence of water vapor (H2O), ultraviolet (UV) radiation from the sun illuminates ozone to form OH *. The initial reaction involves the photolysis of O3 by solar radiation.

① O 3+UV → O 2+O

Then, the oxygen atom (O) reacts with water vapor to generate two OH *.

② O + H 2 O→ 2 OH*

2、 Artificially generated hydroxyl radicals

UV radiation of specific wavelengths and intensities forms hydroxyl radicals with water in the air (humidity ≥ 5%).

3、 Introduction to functional features

1. Characteristics of hydroxyl groups

① Hydroxyl radicals are oxidants in nature second only to fluorine in terms of oxidation potential (fluorine has an oxidation potential of 3.03 eV, hydroxyl radicals have an oxidation potential of 2.80 eV, and ozone has an oxidation potential of 2.07).

② Hydroxyl radicals can interact with over 5000 known compounds, including inorganic substances such as H2S, CO, NH3, etc; Organic compounds such as aldehydes, alcohols, ketones, ethers, benzene, etc. react with microorganisms such as bacteria, viruses, molds, etc.

③ The chemical reaction involving hydroxyl radicals can be completed within 22-44ms (milliseconds), with a reaction rate one million times faster than ozone.

④ The lifespan of hydroxyl groups is very short, and outdoor hydroxyl groups will not float indoors.

⑤ Hydroxyl groups are lighter than air and easier to flow with air.

2. Characteristics of hydroxyl purifier

① Green technology that replicates natural principles, harmless to humans, animals, plants, and pets;

② Convenient, efficient, and capable of human-machine coexistence;

③ Purification technology without the addition of chemical substances;

④ Applied to the air, surfaces of hard objects, and inside fabrics, it can kill bacteria, viruses, and molds; Remove VOCs, odors, etc

⑤ Harmless to sensitive materials such as rubber, plastic, and fabrics.

⑥ Hydroxyl purifiers can achieve natural equilibrium - indoor pollutants are completely eliminated, and there will be no more chain reactions, that is, reaching an equilibrium state.

4、 Combining our company's practice and product development ideas

The necessary conditions for generating hydroxyl groups are ozone, water (in air), and 254nm ultraviolet radiation

We can adjust the amount of ozone produced while ensuring (hydroxyl) efficiency. It is best to keep it within a safe range during the ozone generation stage. If more ozone must be generated at this stage, an ozone catalyst (manganese dioxide) needs to be added at the end to ensure that the outlet concentration does not exceed the standard.

Explanation of Free Radical Chain Reaction:

Interior of the chamber: Under conditions of ultraviolet radiation, water in the air continuously forms hydroxyl radicals;

Outside the chamber: Hydroxyl radicals have a short lifespan and a very limited distance to float out of the chamber. And hydroxyl groups will follow

The organic matter entering the chamber through air flow oxidizes into organic free radicals, which quickly form peroxide free radicals with surrounding oxygen. These substances are less oxidative than hydroxyl free radicals, but more stable and have a longer dispersal distance, and can handle compounds and microorganisms in a certain area. Peroxy radicals can also form oxygen radicals in ambient air, which are more stable oxidants and can spread further, reacting with surrounding organic matter and microorganisms. Similarly, many downstream chain reactions will occur, during which not only more stable and widely spread free radicals will be generated, but also new hydroxyl radicals will be formed and dispersed throughout the entire space. Because these free radicals pervade the entire air, oxidation occurs on the surface of objects and inside fabrics.