Abstract
Fruit shell activated carbon has adsorption properties due to its developed pore structure. The usage cycle is influenced by multiple factors and is renewable. The regeneration methods include heating activation, steam blowing, and acid-base treatment. The adsorption effect is influenced by pore size, physical structure, surface chemical functional groups, adsorbate, and application conditions.
Although there are many varieties of fruit shell activated carbon in terms of appearance and application, they share a common characteristic of “adsorption”. The reason for the adsorption of fruit shell activated carbon is because it has a developed pore structure.
The way to improve the adsorption performance of fruit shell activated carbon in the production process is to control the production process and increase the pore structure of fruit shell activated carbon as much as possible per unit volume. Therefore, the higher the adsorption capacity of fruit shell activated carbon, the lower its density due to the presence of a large number of pores. This is why fruit shell activated carbon with better adsorption capacity has a lighter hand feel.
The service life of fruit shell activated carbon is generally 1-2 years, which is affected by its own iodine value, water quality pH, water flow rate, and impurity content in the water. Fruit shell activated carbon belongs to renewable carbon, which means that if the adsorption capacity of fruit shell activated carbon decreases after a period of use, it can be reused through regeneration.
Regeneration method of fruit shell activated carbon
1. Heat the fruit shell activated carbon to around 100 ℃ to vaporize the water, melt it at 800 ℃, and activate it by heating it between 800-900 ℃ to oxidize and remove the organic matter adsorbed on the fruit shell activated carbon, thereby regenerating the fruit shell activated carbon.
2. Steam wash the fruit shell activated carbon to regenerate it. Steam blowing can effectively remove volatile adsorbents with low boiling points. This method is simple and consumes less.
3. Add 10% acid or alkali to the fruit shell activated carbon to regenerate it. Adding 10% acid or alkali mainly desorbs and removes the organic adsorbates inside the fruit shell activated carbon.
Factors affecting activated carbon adsorption
1. Pore structure. Especially micropores determine the adsorption capacity of activated carbon. If there are a large number of mesopores, it also has a certain impact on the adsorption capacity.
2. Physical structure. The adsorption performance will vary in speed depending on the particle size of activated carbon. It is worth noting that the surface area of activated carbon exists in the rich internal pore structure, and it cannot be assumed that the effect of finely ground activated carbon is greater than that of activated carbon with the same particle size. However, it affects the time for it to reach the equilibrium adsorption value.
3. Surface chemical functional groups. Generally speaking, the more acidic compounds are present in the surface chemical functional groups, the more favorable it is for the adsorption of acidic compounds, while alkaline compounds are more favorable for the adsorption of weak or non acidic substances.
4. Adsorbent. The adsorption effect of activated carbon varies with different adsorbates. For volatile organic compounds, the larger the molecular weight, the higher the removal rate. Gases that are easily liquefied and have high boiling points are relatively easy to adsorb.
5. Application conditions. Temperature, pressure, concentration of adsorbate, pH value, and packing density of activated carbon adsorbent all have an impact on the adsorption capacity.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Jan-17-2025