What are the adsorption characteristics of fruit shell activated carbon particle filter media? Fruit shell activated carbon has many different shapes and sizes of pores, and the total area of pore walls is the surface area. The surface area of each gram of fruit shell activated carbon can reach 700-1600m2. Due to such a large surface area, fruit shell activated carbon has strong adsorption capacity. The adsorption characteristics of fruit shell activated carbon are not only affected by the pore structure, but also by the surface chemical properties. In addition to carbon element UV, fruit shell activated carbon also contains two substances, one is elements that are chemically bonded, such as oxygen and hydrogen; Another type is ash content, which varies with the type of fruit shell activated carbon. The ash content of fruit shell activated carbon is less than 3%, while the ash content of coal based activated carbon is as high as about 20% -30%. The sulfur content in fruit shell activated carbon is relatively low, and high-quality fruit shell activated carbon should not detect sulfides.

The presence of oxygen has a significant impact on the properties of fruit shell activated carbon, as these elements form chemical bonds with carbon, resulting in various organic functional groups and carbon compounds on the surface of the activated carbon. These oxides and hydrocarbons cause chemical reactions between the activated carbon and the adsorbate molecules, demonstrating the selective adsorption characteristics of fruit shell activated carbon during the adsorption process. There are three types of adsorption effects of fruit shell activated carbon.

The adsorption generated by the force of physical adsorption molecules is called physical adsorption, and its characteristic is that the adsorbed molecules are not attached to the fixed points on the surface of the adsorbent, but can move freely on the interface. It is a reversible process where the adsorbed molecules leave the solid surface due to thermal motion during adsorption, and the adsorption heat is relatively small, usually 21-41.8 kJ/mol. It does not require activation energy and can be carried out at low temperatures. This phenomenon is called desorption. Physical adsorption can form both monolayer and multilayer adsorption. Due to the widespread presence of molecular forces, a single adsorbent can adsorb multiple substances However, due to different adsorbent substances, the adsorption capacity also varies. This adsorption phenomenon is closely related to the surface area and pore distribution of the adsorbent, as well as the surface tension of the adsorbent.