How to identify the pros and cons of activated carbon?

Look at the size

The higher the adsorption capacity of activated carbon, the more pores there will be, the looser the activated carbon will be, and the lighter the relative density will be. Therefore, the better the adsorption capacity of activated carbon, the lighter it feels and the larger its volume under the same weight. Therefore, good activated carbon will feel lighter. When packaged with the same weight, the volume of activated carbon with good performance will be much larger than that of inferior activated carbon. As the adsorption capacity increases, the production cost of activated carbon will be higher, and it will be in a geometric progression. According to statistics, unactivated coconut shell carbon (specific surface area 300-500 square meters/g) only costs 2.5 yuan per kilogram. This is the motivation for selling low-adsorption activated carbon on the market pretending to be high-adsorption activated carbon.

Look at the particle size

The smaller the particles of activated carbon, the larger the contact area with air, the larger the specific surface area, and the better the adsorption effect. However, the smaller the particles, the greater the loss and the more dust during the crushing and production process. Therefore, in order to reduce costs, many manufacturers use Of course, the effect of activated carbon with large particles is not good. The performance of activated carbon with particles exceeding 2mm is very poor.

look at dust

The first principle of using activated carbon is not to dirty things. To produce activated carbon, post-processing must be carried out, that is, the crushed coconut shells, etc. must be removed from dust. Otherwise, there will be too much dust and the cleanliness will be very poor. The activated carbon bag will be dirty when you hold it in your hand. It is very dirty. The result is that if inhaled, it will be harmful to the human body. Moreover, the surrounding items will be contaminated. In order to reduce costs, the inferior activated carbon currently on the market does not post-process the activated carbon ash. The dust is very large. Use hand molds. It will be very dirty when you put it on, and it will also stain surrounding items when you use it.

look at bubbles

Put a handful of activated carbon into the water. Due to the osmosis of water, the water will gradually immerse into the pore structure of the activated carbon, forcing the air in the pores to be discharged, thereby producing a series of extremely fine bubbles and pulling out a fine bubble line in the water. At the same time, it will make a little bubble sound, which is very interesting. The more intense this phenomenon occurs and the longer it lasts, the better the adsorption of activated carbon.

Look at the depigmentation ability

Another manifestation of the adsorption capacity of activated carbon is its decolorization ability. Activated carbon has the unique ability to turn colored liquids into light colors or colorless. This is actually due to the fact that activated carbon adsorbs pigment molecules in colored liquids. Because of this characteristic, activated carbon is widely used in the production process of turning brown sugar into white sugar in the sugar industry.

Take two transparent cups, put pure water into one cup, and then drop a drop of red ink (any pigment that is easy to observe but does not change the properties of the water can be used here, such as blue ink, printer color ink, (But ink and carbon ink cannot be used). After mixing evenly, pour half of the colored water into another cup for comparison. Put the activated carbon into the colored water. The amount should reach half or more of the water. The effect will be more obvious. After leaving it for 10-20 minutes, compare it with the reference water sample. Under the same conditions, the stronger the decolorization effect, the stronger the activated carbon adsorption. The better the sex.