- Modification of the physical properties of the surface: The modification of the surface structure of activated carbon is mainly to modify the specific surface area and pore size of the activated carbon through physical or chemical methods, expand or reduce the pore size, to achieve the intention of changing the surface structure of the activated carbon, and then talk about the activated carbon Absorption ability.
- Modification of the chemical properties of the surface: The change of the chemical properties of the activated carbon surface is mainly to change the functional groups on the surface of the activated carbon and the ions and compounds loaded on the surface through a certain method, and then change the chemical properties of the surface to achieve the improvement of the adsorption ability of the activated carbon. The following are several ways to modify the appearance of chemical properties:
①Appearance acid-base modification: The acid-base modification method uses acids, alkalis and other substances to treat the activated carbon, and adjust the functional groups on the surface of the activated carbon to the required quantity according to actual needs. granular carbon Usually the acid-base modification of activated carbon is to improve the adsorption of activated carbon to metal ions. Commonly used modifiers are HCl, NaOH, HNO3, HClO, H2SO4, H2O2, NH3??H20, citric acid, etc.
②Loaded atom modification: The loaded atom modification is based on the adsorption and recovery of activated carbon. The activated carbon is immersed in a certain solution, and specific atoms and compounds are introduced into the surface of the activated carbon through liquid phase accumulation to invade metal ions. The appearance of activated carbon is mainly to use the recoverability of activated carbon to restore metal ions into elemental or low-priced ions.
③Appearance restoration and modification: The activated carbon''s appearance is restored and modified with a restoring agent under appropriate conditions to increase the content of basic groups and enhance the appearance of non-polarity, thereby improving the ability of activated carbon to adsorb non-polar substances.yrdcarbon.com
