The granular activated carbon with chemicals is very porous, mostly in the range of micropores and mesopores, but the pore surface of activated carbon by water vapor and activated carbon by chemicals is less hydrophobic and more negatively charged.
The role of activated carbon pore structure in water treatment applications:
granular activated carbon is often used to adsorb molecules. The adsorption of granular activated carbon determines its applicability, and the adsorption is related to the pore size distribution of various carbon types. Take steam activated peat-based, lignite-based and coconut shell-based powdered activated carbon as an example: peat-based activated carbon has micropores and mesopores, and granular activated carbon can be used for a variety of applications; lignite-based carbon has more mesopores and particles Activated carbon also has large mesopores, providing excellent accessibility; coconut shell-based granular activated carbon is mainly micropores, only suitable for the removal of low molecules.
Granular activated carbon by chemicals is very porous, mostly in the range of micropores and mesopores. However, compared with water vapor activated activated carbon and chemical activated activated carbon, the pore surface is less hydrophobic and more negatively charged. Take extruded and crushed granular activated carbon as an example: peat-based extruded activated carbon can be made into varieties with different pore size distributions. Granular activated carbon micropore-based varieties are mainly used for gold recovery in gas-phase applications. The varieties with both micropores and mesopores are mostly used for liquid phase applications, such as the adsorption of small molecules and large molecule impurities in water purification.
Crushed coal-based granular activated carbon has both micropores and mesopores, which can be used for various purposes. Lignite-based or coconut shell-based granular activated carbon has the same micropore and mesopore structure as powdered carbon. The technical indexes of activated carbon are very important: the performance indexes of activated carbon products can be divided into physical performance indexes, activated carbon chemical performance indexes, and granular activated carbon adsorption performance indexes. The three performance indicators play a very important role in the selection and application of activated carbon. The main physical performance indicators of activated carbon are: shape, appearance, specific surface area, pore volume, specific gravity, mesh, particle size, wear resistance, floating rate, etc.
The main chemical performance indicators of granular activated carbon are: PH value, ash, moisture, ignition point, uncarbonized, sulfide, chloride, cyanide, sulfate, acid soluble, alcohol soluble, iron content, zinc content, lead content, arsenic Content, calcium and magnesium content, heavy metal content, phosphate, etc. The main adsorption performance indicators of activated carbon are: methylene blue adsorption value, iodine adsorption value, phenol adsorption value, carbon tetrachloride adsorption value, caramel adsorption value, quinine sulfate adsorption value, saturated sulfur capacity, penetrating sulfur capacity, water capacity , Ethyl chloride vapor protection time, ABS value, etc.
