What Are The Indicators Of Activated Carbon Adsorption Capacity?

Activated carbon, as a carbonaceous adsorption material, is widely used in gas and liquid adsorption purification. Therefore, accurate detection of its physical properties, adsorption properties and chemical properties is very important for guiding the production and application of activated carbon.

Activated carbon adsorption performance detection

1. Iodine value (iodine adsorption value)

Refers to the amount of iodine absorbed by each gram of activated carbon when the residual (equilibrium) concentration of iodine in the solution is 0.02N/L. The unit of iodine value is mg/g. The diameter of iodine molecules is only 0.335nm, so the iodine value is mainly used to characterize the degree of development of activated carbon micropores and the adsorption capacity of activated carbon for small molecules.

2. Methylene blue value

Refers to the number of milligrams of methylene blue absorbed when 1.0g of carbon reaches equilibrium with a methylene blue solution with a concentration of 1.0mg/L. Common units are mg/g and ml/0.1g. Unit conversion formula: 1ml/0.1g = 15mg/g, such as methylene blue value 8ml/0.1g = 120mg/g.

3. Carbon tetrachloride adsorption value/carbon tetrachloride adsorption rate CTC

Refers to the adsorption ratio of activated carbon to carbon tetrachloride. Under specific temperature conditions, carbon tetrachloride vapor is mixed and passed through activated carbon. After a period of time, it is weighed and this step is repeated until the weight remains unchanged. When the activated carbon is saturated with adsorption, the total amount of carbon tetrachloride adsorbed by the activated carbon is the carbon tetrachloride adsorption value of the activated carbon.

4. Specific surface area m2/g

Refers to the sum of the surface area of ​​the particles and the internal surface area of ​​the pores inside the particles of 1g of activated carbon.