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Element composition of activated carbon

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Activated carbon consists of oxygen, hydrogen and other elements besides carbon. Oxygen and hydrogen in the activated carbon mostly form a chemical combination with carbon to form surface oxides. Other elements mainly form the ash of the activated carbon. The content of various elements in activated carbon is related to the raw materials used and the technological conditions for manufacturing activated carbon.

One carbon element

Carbon is the main element in activated carbon. The content of carbon in wood activated carbon is usually above ninety percent and increases with the increase of activation degree. The existence state of carbon has a decisive influence on the properties and structure of activated carbon. The microcrystalline structure formed by it brings the porous property to the activated carbon; it has a great influence on the surface properties of the surface of the activated carbon, such as the type and quantity of the surface compounds produced by the two elements of hydrogen and oxygen.

Two oxygen elements and hydrogen elements

The elements of oxygen and hydrogen are the main elements besides activated carbon in activated carbon. All the activated carbons have different degrees of existence of these two elements.

The oxygen and hydrogen contained in the raw materials can not be completely removed during carbonization and activation, and are the main sources of these two elements. In addition, there will inevitably be air and water vapor in the activation process of carbonization, and also one of the possible sources of oxygen and hydrogen. With the increase of carbon and activation temperature, the content of oxygen and hydrogen in activated carbon decreases. However, even if temperatures rise above 1000 degrees Celsius, they can not be removed from activated carbon.

The two elements of oxygen and hydrogen usually form surface compounds on the surface of activated carbon, thus affecting the adsorption performance of activated carbon.

Three ash

Ash is an inorganic part of activated carbon. The content and composition of ash are greatly influenced by the type of material, and to a certain extent, it is influenced by the technological conditions used in the manufacture of activated carbon.

The chemical composition of ash is relatively complex, usually composed of oxides of many elements, carbonate and silicate.

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