Bamboo charcoal can absorb moisture, peculiar smell and various harmful gases in the air. This is because in the process of bamboo carbonization, the void structure of bamboo has undergone subtle changes. When the water in the bamboo evaporates, the cell gap shifts, and the sediment in the bamboo capillary tube is also reduced. Many impurities on the original bamboo are replaced because they are not filled with water and inclusions, and become more spacious and dense. Therefore, the void area of bamboo carbon is increased while retaining the multi-void structure of bamboo. This honeycomb-like structure gives bamboo charcoal a super adsorption force.