Fruit shell activated carbon is a high-performance adsorption material widely used in water treatment, air purification, food processing, and the chemical industry. Its excellent adsorption performance is primarily due to its unique chemical composition and microstructure.
From a chemical perspective, fruit shell activated carbon is primarily composed of carbon, typically exceeding 90%. The carbon skeleton is the foundation of its adsorption capacity, forming a well-developed microporous and mesoporous structure, providing a large specific surface area, typically reaching 1000-1500 m²/g. In addition to carbon, fruit shell activated carbon also contains small amounts of elements such as hydrogen, oxygen, and nitrogen. These elements exist on the activated carbon surface in the form of functional groups such as hydroxyl (-OH), carboxyl (-COOH), and carbonyl (-C=O), which affect its surface polarity and chemical adsorption properties.
Fruit shell activated carbon is typically made from raw materials such as walnut shells, apricot shells, and coconut shells, and is produced through high-temperature carbonization and activation. The carbonization process removes volatile substances and forms a preliminary carbon structure. The activation stage (commonly performed using physical or chemical activation methods) further expands the pores and optimizes the pore distribution through the use of steam, carbon dioxide, or chemical reagents (such as phosphoric acid or potassium hydroxide). Activation conditions directly influence key performance indicators of the final product, such as the iodine value and methylene blue adsorption value.
Furthermore, nutshell activated carbon has a low ash content, typically less than 5%, primarily composed of inorganic minerals such as silicon, aluminum, and calcium. Excessive ash content can reduce adsorption efficiency. Some products undergo acid or water washing to reduce impurities and improve purity.
In summary, the chemical composition of nutshell activated carbon determines its high adsorption capacity and selectivity, making it a valuable material in environmental protection and industrial applications. In the future, by manipulating surface functional groups and pore structure, its applications in high-precision separations and catalysis can be further expanded.