1. Can activated carbon in addition to formaldehyde still be used?
1, activated carbon can only adsorb formaldehyde, and it will be released after a period of time, which is of little basic use.
2. Activated carbon is mainly used for filtering insoluble substances, adsorbing harmful gases and adsorbing some soluble substances. The composition of activated carbon is mainly based on charcoal and various shell coals, and the raw materials are prepared by physical and chemical methods.
3. Activated carbon outside in addition to formaldehyde has this effect. With special spherical activated carbon as the carrier (which has obtained national patent), it is developed by high-tech means according to the scientific formula of A+B, which can completely remove the efficacy.
4. Activated carbon has strong physical adsorption and chemical adsorption functions, and can adsorb some organic substances to achieve the removal effect. Using this principle, we can quickly and effectively remove harmful substances, odors and pigments from aquarium water, and the water quality can be improved rapidly.
Second, the selection skills of activated carbon
1. Look at the density: the more pores of activated carbon, the higher its adsorption performance, the more brittle it is, the lower its relative density, the lighter its hand feel, and the larger its volume when packed in equal weight. It is recommended to buy activated carbon products with light handle, low density and large weight and volume.
2. Look at the size: the smaller the activated carbon particles, the larger the contact area with air, and the larger the specific surface area, the better the adsorption performance. However, the smaller the particles, the greater the loss in the crushing process, the more dust and the higher the cost. Therefore, many manufacturers use large granular activated carbon to reduce costs, and the performance is of course not good. Generally, the activated carbon with a particle size of about 0.5 mm not only achieves the performance, but also ensures that it is not powder and will not have pollution problems. It is suggested to choose activated carbon products with particle size of 0.42-0.85 mm
3. Look at the composition: activated carbon absorbs harmful gases through the pore size. Different harmful gases have different molecular weights and particle sizes. The gap of activated carbon should be between 0.45 and 2 nm to absorb toxic gases such as formaldehyde. Internationally, coconut shell carbon is an activated carbon for adsorbing odor and stupid pollution, and gas-phase spherical microporous activated carbon is an ideal formaldehyde adsorption carbon. It is suggested to buy a comprehensive adsorption product made of coconut shell activated carbon and gas-phase spherical microporous activated carbon. Coconut shells are not necessarily better, but they should match the pore size of harmful gas molecules.
4. Look at the dust: in the process of producing activated carbon, it is necessary to remove the dust from the crushed raw materials, otherwise the cleanliness will be much worse if there is too much dust, which will cause pollution to people and articles. In order to reduce the cost, the inferior activated carbon on the market has not been post-treated and the dust is very heavy, so dark packaging bags are often used. Small charcoal bags are dirty to the touch, which will pollute articles and cause secondary pollution when used. It is recommended to choose a small charcoal bag, which is a white breathable non-woven bag, feeling no dust and dirt.
5. Look at bubbles: put activated carbon into water. Because water molecules are very small, water will gradually immerse into the pore structure of activated carbon, forcing the air in the pores to be discharged, thus producing a series of extremely fine bubbles, drawing a fine bubble line in the water and making a slight bubble sound. The better the performance of activated carbon, the stronger and longer this phenomenon lasts.
Can activated carbon in addition to formaldehyde still be used? Activated carbon has a certain effect on in addition to formaldehyde. If you think activated carbon is not bad and plan to buy it, you can also look at the selection skills of activated carbon before deciding whether to buy it. If you buy activated carbon, you should also know how to put it correctly, otherwise it will be useless to buy it back.