Honeycomb activated carbon is a new adsorbent material with a regular pore structure. Due to its high specific surface area, excellent gas and liquid adsorption performance, and low flow resistance, it is widely used in environmental protection, chemical engineering, and pharmaceutical fields. Its preparation methods and performance optimization are currently hot topics in research.
Honeycomb activated carbon is typically made from coal, wood, or fruit shell activated carbon. After uniform mixing with a binder (such as phenolic resin or polyacrylonitrile), the mixture is extruded into a honeycomb green body. The formed green body is dried to remove moisture, followed by carbonization and activation at high temperatures (typically 800-1000°C). Activation can be performed using physical activation methods (such as water vapor or carbon dioxide) or chemical activation methods (such as phosphoric acid or potassium hydroxide) to further expand the pore structure and enhance adsorption capacity.
During the preparation process, the raw material ratio, binder type, extrusion pressure, and activation conditions all have a significant impact on the pore structure and adsorption properties of honeycomb activated carbon. Research has shown that appropriately increasing the activation temperature and time can increase the specific surface area, but excessively high temperatures may cause structural collapse. Furthermore, optimizing the binder ratio can improve mechanical strength, making it suitable for fixed-bed or moving-bed adsorption systems.
Honeycomb activated carbon is primarily used in waste gas purification (such as VOCs treatment), water treatment (such as heavy metal adsorption), and industrial catalysis. Its unique honeycomb structure not only improves mass transfer efficiency but also reduces system pressure drop, outperforming traditional granular activated carbon. Future developments will focus on further enhancing its selective adsorption capacity through nano-modification and composite doping techniques.