The adsorption of activated carbon mainly includes physical adsorption and chemical adsorption. Chemical adsorption refers to the formation of specific chemical bonds between the adsorbate molecules and the functional groups on the surface of the activated carbon. The use of acid and alkali regenerants is to reduce the affinity of the adsorbate with activated carbon and increase the solubility of the adsorbate to achieve a good regeneration effect. The adsorption of activated carbon mainly includes physical adsorption and chemical adsorption. Chemical adsorption refers to the formation of specific chemical bonds between the adsorbate molecules and the functional groups on the surface of the activated carbon. The use of acid and alkali regenerants is to reduce the affinity of the adsorbate with activated carbon and increase the solubility of the adsorbate to achieve a good regeneration effect. The acid and alkali regeneration method has many advantages over the thermal regeneration method: 1. It can be carried out on site, and the materials need to be handled, transported, and repacked. 2. There is no loss of charcoal due to thermal regeneration. 3. Recoverable valuable adsorbate. 4. The recovery method is appropriate and the chemical regenerant can be reused.
The acid and alkali regeneration method is to selectively select the activated carbon by acid or alkali to react with the substance adsorbed by the activated carbon to form a soluble salt, which is desorbed from the surface of the carbon. On the one hand, the acid and alkali change the acidity and alkalinity of the solution, and the purpose is to increase the solubility of the removed material in the activated carbon, so that the adsorbed substance is released from the carbon species; on the other hand, the acid and the alkali can directly adsorb and adsorb. The substance reacts chemically to form a salt that is readily soluble in water.
This method is particularly suitable for applications where the amount of adsorption is greatly affected by the pH. After the chemical regeneration, the activated carbon is washed with water and re-introduced into the adsorption application. The method can be directly regenerated in the activated carbon adsorption device, and the equipment and operation management are convenient, the regeneration efficiency is high, and the carbon loss is small. However, due to the simultaneous physical adsorption and chemical adsorption of activated carbon, as the number of regeneration increases, the adsorption rate of recycled carbon gradually decreases.
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