| 초록 |
Calcium phosphate minerals have been synthesized via various routes and using many precursors. However, owing to the numerous application of these minerals, the impetus is on finding novel approaches which would be cheap. Using biowaste as calcium source for synthesis of these minerals is one such approach. Analysis of biowaste like egg shells, corals, cuttlefish, bovine bone, etc have shown that they are rich source of calcium. Clam shells is one such biowaste which is generated in the range of 63000 tonnes annually worldwide. Calm shell represents 70% of the total weight of the shell and is composed of calcium carbonate. In the present study we have demonstrated the synthesis of calcium phosphate minerals, using these clam shells, by microwave synthesis. Calcium carbonate was obtained by ball milling the clam shell for 10hr. The precursors were added in known quantities and microwave heated for various time. The resulting powder was then calcined at 700oC for 1 hr. The resulting powder was then characterized by using X-ray diffraction and scanning electron microscopy. XRD results shows that the calcium phosphate minerals like hydroxyapatite, monetite, calcium dihydrogen diphosphate, calcium phosphate hydrate etc were obtained. |
