A few days ago, after a citizen of Guangzhou checked into a new house, his son developed a systemic skin irritation. After going to the hospital for treatment, the doctor asked if there was any decoration in the home, which may be affected by formaldehyde. After returning home, the citizen contacted the company to test the formaldehyde, confirming that although the house was decorated with environmentally friendly materials and ventilated for several months, there was still a formaldehyde excess. The “0” formaldehyde environmentally friendly materials and ventilating and drying rooms promoted by businesses cannot solve the problem of excessive formaldehyde. So how do we detect and deal with formaldehyde in the house?
Detecting formaldehyde using an electrochemical detector
The electrochemical detection method is widely used in the detection of formaldehyde gas in the room, because the method has a certain controllability, and it can adjust and control the detection sensitivity, so it does not meet the detection needs of different occasions.
The characteristic of this method is that an electrochemical workstation is used to provide electrical energy during the detection process, and the voltage can realize the regulation of the electrochemical signal and the electrochemical luminescence signal. Among the electrochemical analysis methods, electrocatalytic analysis has the widest application range. This method can not only detect formaldehyde gas in the room, but also achieve a certain degree of formaldehyde explanation. Its working principle is to apply the microporous aeration technology to realize the conversion of formaldehyde gas to liquid, use activated carbon fiber as an electrode, and realize the detection of formaldehyde gas through a combination of adsorption and electrocatalytic oxidation.
How to deal with indoor formaldehyde degradation
Ventilation reduces concentration
Ventilation is used to exhaust formaldehyde gas from indoors to outdoors, thereby reducing the concentration of formaldehyde in the air. The advantage of this method is that the operation method is relatively simple, just open the window and ventilate. When necessary, a ventilating fan can also be used to exhaust indoor formaldehyde-containing gas to the outside, while outdoor air is exchanged into the room.
The chemical treatment method is to convert formaldehyde into methanol through a chemical reaction, thereby degrading the formaldehyde. There are two common chemical degradation methods, one is the chlorine dioxide oxidation method, and the other is the ozone oxidation method. Both methods can achieve a certain degree of degradation, but the effect is not as expected, and there is still much room for improvement. The actual operation of the chlorine dioxide oxidation method is relatively difficult, and the ozone oxidation method will generate by-products and cause secondary pollution. Although chemical treatment can theoretically achieve the complete degradation of formaldehyde, the actual chemical reaction efficiency is not so high, and organic chemical reactions are often accompanied by side reactions.
There are two main methods for physical formaldehyde treatment, namely activated carbon method and photocatalytic method. The activated carbon method uses the porous structure of activated carbon to adsorb formaldehyde molecules, thereby achieving the effect of reducing the concentration of formaldehyde in the air. This method has the advantages of simple operation, but the disadvantage is that it will cause pollution to the environment when desorption is achieved through exposure to sunlight. The photocatalytic method is through the irradiation of ultraviolet rays, and the catalyst will have a redox effect, which can purify the air. The materials are mainly semiconductor materials, including ZnO2, TiO2, Fe2O3, etc. The photocatalytic method is also widely used in life. And the cost is low and the development prospect is good.
Ecological Governance Law
Ecological governance law refers to the use of certain plants to absorb formaldehyde to control indoor formaldehyde. Relevant research has confirmed that aloe, spider plant, leafleaf, tigertail, monstera and other plants all have a certain absorption of formaldehyde. The advantages of the ecological governance side are that the cost of governance is low, and it has the effect of beautifying the decorative interior. In addition, plant photosynthesis can increase the concentration of oxygen in the room and absorb carbon dioxide in the air. Therefore, the ecological treatment law is very suitable for the treatment of formaldehyde in the room. The disadvantage of the ecological treatment method is that plants also have a certain tolerance to formaldehyde, and beyond the range that the plants can bear, formaldehyde treatment cannot be performed.