Activated carbon density

Definition

The density of activated carbon is the mass of activated carbon per unit volume. It is usually expressed in grams per cubic centimeter (g/cm³). The density of activated carbon can be divided into two types: true density and bulk density.

  • True densityrefers to the actual density of the carbon material in the activated carbon, excluding pores. The true density reflects the composition and structure of the activated carbon and is usually higher, indicating the density of the material itself.
  • Bulk densitydensity: refers to the density of the activated carbon, including pores. It reflects the pore structure and properties of the activated carbon and affects its adsorption capacity.

The effect of density on performance

The effect of activated carbon density on performance is reflected in the following aspects:

  • Adsorption propertiesDenser activated carbon tends to have a greater number of micro- and mesoporous structures, which provides a higher specific surface area and thus a higher adsorption capacity.
  • Hydrodynamic propertiesduring gas or liquid phase adsorption, the density of the activated carbon determines the pressure drop and fluid resistance in a packed bed or filtration unit, which affects the efficiency of the adsorption process.

Density comparison

Activated carbon from different raw materials has different densities:

Activated Carbon Type True Density (g/cm³) Bulk density (g/cm³) Features
Coconut Shell Activated Charcoal 2.0-2.2 0.45-0.60 High density and good strength, suitable for water treatment and gold recovery
Carbon Activated Charcoal 1.8-2.0 0.35-0.50 Good value for money, commonly used in industrial water treatment and waste gas treatment.
Wood Activated Charcoal 1.5-1.8 0.20-0.40 Low density, large surface area, suitable for decolorization, gas adsorption, and air purification

Density requirements for different applications

The density of activated carbon directly affects its performance in various fields:

  • Water treatmentActivated carbon with a moderate density provides a stable suspension in water and improves adsorption efficiency.
  • Air purificationLow density activated carbon is suitable for air purification due to its large pore structure.
  • Gold recoveryHigh density coconut shell activated carbon is more suitable for application in gold smelting.

Conclusion

The density of activated carbon is an important parameter of its physical properties and is crucial for selecting the right activated carbon product and optimizing its application. Understanding the density of different types of activated carbon can help users to better meet their specific needs.

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