1 properties of activated carbon adsorbents
The larger the surface area, the stronger the adsorption capacity; the activated carbon is a non-polar molecule, which is easy to adsorb non-polar or low-polarity adsorbate; the size of the activated carbon adsorbent particles, the pore structure and distribution, and the surface chemistry. It also has a great influence on the adsorption.
2 properties of adsorbate
Depends on its solubility, surface free energy, polarity, size and unsaturation of adsorbate molecules, concentration of attached substances, etc.
3 wastewater PH value
Activated carbon generally has a higher adsorption rate in an acidic solution than in an alkaline solution.
The pH value affects the state and solubility of the adsorbate in water, thereby affecting the adsorption effect.
4 coexisting substances
When a plurality of adsorbates are coexisted, the adsorption capacity of activated carbon for an adsorbate is poorer than that of the adsorbate alone.
5 temperature
Temperature has little effect on the adsorption of activated carbon
6 contact time
It should be ensured that the activated carbon has a certain contact time with the adsorbate, so that the adsorption is close to equilibrium and the adsorption capacity is fully utilized.
Activated carbon chemistry
In addition to physical adsorption, adsorption of activated carbon also involves chemical adsorption. The adsorption of activated carbon depends on both the pore structure and the chemical composition.
Activated carbon not only contains carbon, but also contains a small amount of chemically bonded, functional group-starting oxygen and hydrogen, such as carbonyl, carboxyl, phenols, lactones, terpenes, ethers. Some of the oxides and complexes contained on these surfaces are derived from derivatives of raw materials, some of which are formed by the action of air or water vapor upon activation and activation. Surface sulfides and chlorides are sometimes formed.
In the activation, the minerals contained in the raw materials are concentrated into activated carbon to become ash, and the main components of the ash are salts of alkali metals and alkaline earth metals, such as carbonates and phosphates. These ash contents can be lowered by washing with water or pickling.
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