Chlorine dioxide has strong oxidation, which can react with formaldehyde in the air to generate formic acid, and then chlorine dioxide reacts with formic acid to generate carbon dioxide and water. This is the principle of chlorine dioxide in addition to formaldehyde.
Chlorine dioxide can indeed remove formaldehyde, such as free formaldehyde in the air, but it is ineffective for bound formaldehyde. There are about three kinds of formaldehyde in daily life: free state, adsorbed state and bound state.
They refer to formaldehyde that is free in the air; Formaldehyde attached to the surface of an object; Compound formaldehyde formed by free volatilization. Because of its chemical properties, carbon dioxide can only remove free formaldehyde through redox reaction.
The best way to remove formaldehyde
1, activated carbon
Introduction: Activated carbon is a widely used aldehyde removal product, which mainly uses the principle of physical adsorption to treat formaldehyde. Because of its internal structure, it has a strong adsorption capacity.
Advantages: convenient use and low price.
Disadvantages: The in addition to formaldehyde cycle of activated carbon is only about 20 days. Over time, activated carbon will be in a saturated state, no longer has adsorption capacity, can not effectively adsorb formaldehyde, and there is a danger of secondary release.
2. Photocatalyst
Brief introduction: Photocatalyst is a kind of catalyst originated in Japan, which can react with ultraviolet rays and decompose formaldehyde (HCHO) into carbon dioxide and water.
Advantages: it can decompose formaldehyde well and has low price.
Disadvantages: Highly dependent on ultraviolet rays, normal sunlight can't reach the standard of promoting oxidation, especially at night, so it is basically not used in Japan (the Japanese now use a plant extract to treat plates and decorate), but photocatalyst is still widely used in some families in China.