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 The physical properties of activated carbon: Activated carbon is a multi-aperture charcoals, extremely rich in pore structure, with good adsorption properties, and its adsorption by physical and chemical adsorption force from its appearance and color was black. In addition to the main charcoal, its components, but also contains a small amount of hydrogen, nitrogen, oxygen, its structure shape like a hexagon, due to the irregular hexagonal structure to determine the multi-body trifoliate and high surface area characteristics per gram of activated carbon with surface area equivalent to as much as 1000 square meters. 
 Activated carbon materials: activated carbon mainly material made of high carbon content, such as wood, coal, nut shell, bone, oil residues, etc.. Coconut shells for the most commonly used raw materials, under the same conditions, the quality of the activity of the coconut shell activity and other special features is the best, because the largest surface area. Activated carbon costs: the cost of activated carbon in raw terms, the most expensive case of coconut shell, wood quality and coal activated carbon deep level of processing can be a lot of deep processing of the same product can also cause very different costs, customer corresponding to the activated carbon products mainly selected according to their practical application. 
 Activated carbon production process: 
 Activated carbon production methods can be divided into physical vapor and chemical methods of production, here focused on the production of physical vapor method, the general production is divided into two processes, the first step, carbonization, the raw material in the 170-600 temperature drying the same amount of carbonization of the organic tissue of 80% r. Second step, the activation will be the first step has been carbonized good carbonized material into the reactor, and the activator and water vapor response to complete the activation process, finished goods. In the process of endothermic reaction to produce CO and H2 assembly of gas for the charring material heated to proper temperature (800-1000 degrees), remove all of its biodegradable material, resulting in pore structure and huge specific surface area, activated carbon has a strong adhesive force. Different raw materials to produce activated carbon with different pore size, including the smallest pore size of activated carbon coconut shell as raw materials, wood activated carbon pore size is generally larger pore size of activated carbon from coal between the two. 
 Activated carbon pore size is generally divided into three categories: macroporous :1000-1000000A transition pore :20-1000A micropores: 20A according to the above features can be seen for different adsorption object, you need to choose the appropriate activated carbon, to achieve best value for money generally in the liquid phase adsorption, should be used more transition pore diameter and average pore diameter of activated carbon. Activated Carbon Applications: According to the adsorption characteristics of activated carbon, activated carbon is mainly used to remove liquids, gases, water pollutants, bleaching, filtration, purification, and also for the purification of air, exhaust gas recycling (such as the gas in the chemical industry, "benzene" recovery), recovery and refining of precious metals (such as the absorption of gold). With the development of science, the use of activated carbon, with the national emphasis on the ecological environment, activated carbon also waving an increasingly larger role. Activated carbon is the use of high-quality anthracite, charcoal, or a variety of fruit shell as raw materials by physical or chemical method, through a special process, with well-developed pore structure and specific surface area of ??a carbon products, this particular gap structure due to activated carbon, making It has strong adsorption capacity, is widely used for air purification, anti-virus protection, water, solvents, bleaching and other industrial and civil fields. In recent years, as people gradually realize that the activated carbon, activated carbon market, rapid development, but at the same time in the development of the poor quality of activated carbon products also stepped in, and seriously affected the normal development of the activated carbon market to consumers caused adverse consequences. In order to allow consumers to choose to rest assured that the products here on how to choose high quality activated carbon to make a brief description. Activated carbon although in appearance and use, there are many varieties, but activated carbon has a common characteristic, that is, the adsorption. Activated carbon to produce the adsorption of the reasons is because it has a well-developed pore structure, as we have seen a sponge, under the conditions of the same weight, the sponge can absorb more water than any other object, the reason is also because it has developed pore structure. But the pore structure of activated carbon to the naked eye can not see, because they have only 1 × 10-12mm-10-5mm between, not much bigger than a molecule. Developed the extent of activated carbon pore is difficult to imagine, take 1 gram of activated carbon, to which all the pore wall and launched into a plane, this area will reach 1000 square meters (both specific surface area for 1000g/m2) The main factor of activated carbon adsorption depends on the level of development of the internal pore structure. In the production process, the only way to improve the performance of activated carbon adsorption is to control the production process, the pore structure of activated carbon per unit volume to increase as much as possible. Therefore, the higher the adsorption properties of activated carbon due to contain a large number of pores, makes its own density to become smaller, which is why activated carbon adsorption of the better feel the more light the reason (the premise is to use the same raw material production, does not dip over the water or adsorption of other substances). The same time as the higher cost of production of activated carbon adsorption improve, but it is growing exponentially, which is useful for low adsorption on activated carbon in the market posing as the motive of the activated carbon sales. Uniform standards, so that production can be controlled based calibration of activated carbon adsorption, the higher the adsorption value of iodine adsorption, or adsorption value of carbon tetrachloride (CTC), commonly used in the activated carbon industry, the stronger the adsorption capacity of activated carbon. Understand the above points, it is not difficult to judge the quality of activated carbon performance. The higher the adsorption values ??of activated carbon the better the performance. How easy it is in the testing equipment to identify the level of activated carbon adsorption values? Here are several easy methods for reference. 
 1, a direct look at the indicators provided by the manufacturer. Commonly used activated carbon adsorption indicators are: iodine value, carbon tetrachloride (CTC) adsorption value and methylene blue adsorption value, iodine adsorption value used to represent the adsorption capacity of activated carbon for liquid substances, carbon tetrachloride adsorption value used to represent activated carbon adsorption capacity for gaseous substances, methylene blue adsorption value is used to indicate the active carbon capacity. The higher of these three indicators show that the adsorption capacity of activated carbon is the stronger. Buy activated carbon can be provided in accordance with their own usage combined with the manufacturer of these indicators to buy for their own use of activated carbon. 
 2, hand-weigh weight. Above has been introduced in order to improve the performance of activated carbon adsorption, only as much as possible the manufacture of the pore structure of activated carbon, the pore is more activated carbon is more crisp, and the relative density of the more light, the feel of good activated carbon would be more light, in the case of equal weight of packaging, the good performance of activated carbon than the volume of low-quality activated carbon. 
 3, see the bubbles. A small activated carbon into the water, due to the permeation of water, the water will gradually into the pore structure of activated carbon, forcing air out of the pore, resulting in a series of very small bubbles in the water, pulled out a small bubble line. will issue a trace of bubbles sound very interesting. This phenomenon, the more intense the longer the duration, activated carbon adsorption, the better. 
 4, see the decolorization ability. Another manifestation of the activated carbon adsorption capacity is the decolorization ability of activated carbon can colored liquid into the magical ability of a light-colored or colorless, and this is because the activated carbon adsorption reason of the pigment molecules in the colored liquid caused. Precisely because of this feature of the activated carbon is widely used in sugar brown sugar change in the field of sugar industry in the production process. Take two cups, one cup into the pure water, and then drop of red ink (pigment can be any kind of easy to observe but do not change the nature of the water, such as blue ink, printers, color ink, but can not use ink and carbon ink), Stir after half of the colored water into another cup reserved for the comparison sample. Activated carbon into the colored water, the number should reach half or more of water, this effect would be more obvious, put it aside for 10-20 minutes and comparison of water samples were compared under the same conditions, the decolorization effect is the stronger activated carbon adsorption the better. Optional activated carbon should also note the following: an activated carbon packing sealed package. More or less filled with a variety of organic macromolecules in the air, especially phenolic substances concentration as in the newly renovated store or home cabinets greatly, these substances will be activated carbon adsorption, over time, the adsorption performance of activated carbon adsorption of these substances reduce or even unusable. Therefore, the more adsorption of the more high value of the activated carbon should be sealed package to prevent the activated carbon performance of outside interference. 
 2, fake activated carbon on the market today, some semi-finished products of activated carbon "charcoal" posing, charcoal only after "activation" process in order to become a real activated carbon, the activation process is the activated carbon to produce the most important manufacturing process of pore structure process. Carbonized material of the lack of this process can be said that almost no adsorption properties of consumer harm is not shallow. Charcoal because there is no activation of the pore-forming process, so the surface than the activated carbon is smooth, and the color white, slightly metallic luster than the activated carbon hard feel, and the weight is also a lot of weight. There are a considerable part of the fake and activated carbon is used inferior raw materials mixed with diatomaceous earth to burn, its very low carbon content, the majority of non-active substances, carbon color is relatively white, feel very heavy, longer particle length, strength is also high, bump into each other will be issued crisp sound similar ceramic percussion, hand break apart white tiny particles on the section, we buy must pay attention so as not to be taken. 
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