Activated carbon is a strong adsorbent, the adsorption of gas and adsorption capacity are very large.
When the gas molecules occupy the adsorption surface of activated carbon, the adsorption of activated carbon will be reduced, resulting in the so-called "poisoning" of activated carbon.
If there is oxygen on the activated carbon adsorption, sometimes also make the adsorption of the material oxidation reaction.
Therefore, before the use of activated carbon, most of the gas must be removed by adsorption.
Usually remove the gas in activated carbon there are two methods, one method is to use ephedrine or hydrogen sulfide saturated water solution treatment, but this treatment method is too complex, and through these treatments can also cause some other side reactions, so it is not commonly used.
Activated carbon according to its source is usually divided into plant carbon, animal carbon and mineral carbon three kinds, respectively, the use of wood chips or plant fiber, animal bones, coal and so on by high temperature carbonization.
At present, the commonly used medical activated carbon and activated carbon chromatography with wood chips as raw materials, add zinc chloride in 700-800 by high temperature carbonization, activation, and by appropriate methods to remove impurities.
Due to the presence of various metal ions in plants and the addition of zinc chloride in the production process, although it has been properly treated before leaving the factory, it is inevitable to contain trace metal ions, which should be paid attention to when used.
Activated carbons used for chromatography generally fall into the following three categories.wholesale activated carbon pellet(a).
Powdered activated carbonThe general use of medicinal or chemical pure activated carbon.
This kind of activated carbon particles is very fine, in powder form, the total surface area is particularly large, the adsorption capacity is very strong, the adsorption capacity is also very large, is the strongest kind of activated carbon adsorption force.
