- Powdered activated carbon (powdered activated carbon, activated carbon powder)
As well-known and well-known, it is to grind activated carbon to powder. This powdered activated carbon has a large specific surface area, hollow pores, many small pores, and uniform pore size, so that it has strong adsorption capacity. bulk activated charcoal pellets However, due to technical limitations, Therefore, only a few manufacturers of water purifiers are currently in use. It is too thin.
- Compressed activated carbon
This type of activated carbon is based on powdered activated carbon. Powdered activated carbon is doped with a small amount of glue and compressed into a columnar shape. This type of activated carbon is the same as sintered activated carbon because the pore size of the activated carbon is reduced after compression, which greatly reduces the adsorption capacity.
Three, granular activated carbon
Granular activated carbon refers to activated carbon made into granular activated carbon. It is used in the water purifier filter element. Because of its granular shape, its specific surface area for adsorbing pollutants is small, which makes the adsorption capacity of the filter element made of this type of activated carbon lower.
For example, some water purifier filter elements are filled with granular activated carbon into a column, which is easy to form a water path under the impact of water pressure. The water and the activated carbon are not fully contacted, so that the outflow water is not completely purified. activated coconut charcoal powder Moreover, the activated carbon in the middle of the column It is easy to prematurely saturate, so that the charcoal close to the column does not play a role, resulting in poor taste of the water.
Fourth, sintered activated carbon
That is, activated carbon is doped with colloid and then sintered into a columnar shape. This type of activated carbon reduces the pore size of activated carbon after sintering, so that the adsorption capacity of activated carbon is greatly reduced. However, all the activated carbon filter elements of reverse osmosis water purifiers currently use this type. Activated carbon.
The adsorption characteristics of pure acetone gas on activated carbon were measured.
Langmuir model and Dubinin-Radushkevichv (D-R) model were used to fit the adsorption data, respectively.
The Langmuir model and D-R model were compared from the Angle of model fitting accuracy and prediction www.chinactivecarbon.com/of adsorption heat.
Compared with Langmuir model, D-R model has higher fitting correlation coefficient and lower average relative standard deviation for adsorption data, so the fitting result is better.
Based on 10-4-3 potential function, the theoretical adsorption heat of pure acetone gas on activated carbon is 17.9 kJ/mol, which is relatively small, indicating that the adsorption is mainly physical adsorption.
The predicted value of adsorption heat of D-R model is 15.8kJ/mol, which is close to the theoretical calculated value, and the predicted value of adsorption heat of Langmuir model is 40.7 kJ/mol, which is much larger than the theoretical calculated value.
