The adsorption performance of activated carbon is affected by many factors, including ash size, adsorbate molecular size, adsorbate concentration, water temperature, and pH value.
The smaller the ash, the better the adsorption performance; the closer the size of the adsorbate molecule is to the carbon pore diameter, the easier it is to be adsorbed; the adsorption amount increases with the increase of the adsorbate concentration, but the increase of water temperature will lead to a decrease in the adsorption amount, while the decrease of pH value will help to increase the adsorption amount. In particular, alkaline conditions are conducive to the adsorption of activated carbon, which may be because the interaction between the functional groups on the surface of activated carbon and the adsorbate is stronger under alkaline conditions, thereby improving the adsorption efficiency.
Therefore, for application scenarios that require the use of activated carbon for adsorption, such as water treatment or gas purification, adjusting to alkaline conditions may help improve the adsorption effect of activated carbon.
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