In addition to coal-based activated carbon, there are other types, such as wood-based activated carbon and fruit shell-based activated carbon. Wood-based activated carbon is typically made from high-quality wood, available in powdered and granular forms, primarily used for absorbing impurities in liquids. Fruit shell-based activated carbon, made from materials like fruit shells and coconut shells, boasts high surface area and adsorption properties, often used in water treatment and air purification applications.