Product Introduction
Granular activated carbon is a granular adsorbent material with a porous structure. It is usually made from carbon-containing raw materials such as wood, coal, and fruit shells (such as coconut shells, walnut shells, etc.) through a series of complex processes including carbonization and activation. It appears as black granules with relatively uniform size. Its internal pores are interconnected, forming a huge specific surface area, which enables granular activated carbon to have excellent adsorption performance and effectively adsorb various impurities, pigments, odors and harmful substances in liquids or gases.
Specific Parameters
Iodine value: The iodine value is an important indicator to measure the ability of activated carbon to adsorb small molecules. The iodine value of wood-based granular activated carbon is generally 700 - 1000mg/g, that of coal-based granular activated carbon is about 300 - 600mg/g, and that of coconut shell granular activated carbon is usually 800 - 1200mg/g. A higher iodine value indicates a stronger adsorption capacity for small molecular substances.
Particle size: Granular activated carbon has various particle size specifications, with a common particle size range of 0.5 - 5.0mm. A suitable particle size not only ensures a sufficient specific surface area, but also facilitates filling and use in various adsorption equipment, and at the same time enables fluids (liquids or gases) to maintain good fluidity when passing through the activated carbon layer.
Specific surface area: The specific surface area is relatively large, usually between 500 - 1500m²/g. The vast specific surface area provides abundant sites for adsorption, enabling it to adsorb a large number of impurities, whether macromolecular organic colloids or small molecular soluble harmful substances, which can be effectively adsorbed.
Strength: Mechanical strength is an important parameter of granular activated carbon. The compressive strength is generally between 70% - 95%, which enables it to keep the particles intact and not easy to break during use, such as when subjected to air flow, liquid flow impact or mechanical extrusion, thus ensuring the stability of the adsorption process and the normal operation of the adsorption equipment.
pH value: The pH value range is roughly between 4 - 10, which can adapt to a variety of different adsorption environments, and in most cases will not cause significant interference to the adsorption system due to its own acid-base properties.
Applications
Liquid phase adsorption
Drinking water purification: In drinking water treatment, granular activated carbon can remove residual chlorine, odors, and chromaticity from water, adsorb some heavy metal ions (such as mercury, lead, cadmium, etc.) and organic pollutants (such as pesticide residues, polycyclic aromatic hydrocarbons, etc.), improving the quality and taste of drinking water.
Sewage treatment: Used in the advanced treatment of industrial wastewater and domestic sewage, it adsorbs harmful substances such as chemical oxygen demand (COD)-related substances, biochemical oxygen demand (BOD) components, organic dyes, phenols, and cyanides in sewage, helping sewage meet discharge standards or realize reclaimed water reuse.
Food and beverage industry: Used in processes such as sugar making, wine brewing, and fruit juice processing for decolorization, deodorization, and impurity removal. For example, in sugar making, it adsorbs pigments and impurities in sugar liquid to improve the quality of sugar; in wine brewing and fruit juice processing, it removes unpleasant odors and impurities to enhance product flavor.
Gas phase adsorption
Air purification: Used in indoor air purifiers and ventilation systems to adsorb harmful components in the air such as formaldehyde, benzene, TVOC (total volatile organic compounds), odors, and smoke, improving indoor air quality. It can also be used in industrial waste gas treatment to adsorb and purify harmful gases such as volatile organic compounds (VOCs), hydrogen sulfide, and ammonia in waste gas.
