Calcined and Hydrated Shell Powder with Layered Porous Structures for Food Sterilization and Pesticide Residue Removal

Shell powder, a natural source product with excellent adsorption and antibacterial properties, has exhibited a broad application prospect in daily life. Herein, low-temperature calcined shell powder (LCSP) and high-temperature calcined and hydrated shell powder (HCSP) were prepared using shells as raw materials in different calcination processes. The surface structures and the chemical compositions were analyzed and the specific surface areas and pore size distributions were measured. The LCSP and HCSP reserved the unique layered porous structures of the shell. The main composition of LCSP is CaCO 3 , which also contains a small number of organisms. The main composition of HCSP is Ca (OH) 2 , which also contains CaO and a small amount of CaCO 3 . According to the better adsorption characteristic of the HCSP, the antibacterial activities and the removal abilities of pesticide residues of HCSP were systematically studied. The results indicated that HCSP exhibited excellent antibacterial activity (> 99.99%) and high efficiency in removing common pesticide residues (> 90%).