Effect of pH level and calcination on the production of calcium phosphates by acidic route of wet precipitation
AUTOR(ES)
Neves, J. G.; Navarro da Rocha, D.; Lopes, C. C.; Prado da Silva, M. H.; Sinhoreti, M. A. C.; Correr-Sobrinho, L.; Fraga, M. A. A.; Correr, A. B.
FONTE
Cerâmica
DATA DE PUBLICAÇÃO
2021-06
RESUMO
Abstract Multiphasic calcium phosphate powders were synthesized by the acidic route, using lactic acid as a chelating agent that allows the production of a stable and rich solution of calcium and phosphate ions at room temperature. After pH adjusting, without varying the concentrations of precursor solution, XRD and FTIR analyses showed different CaP phases before and after heat treatment at 1000 °C. At pH 5, brushite plate-like particles were produced, while at higher pH levels (7 to 12) nano-hydroxyapatite particles were formed. After the calcination process, partial and total decomposition of hydroxyapatite in the β-TCP phase was explained by XRF analysis due to the calcium-deficient hydroxyapatite of synthesized samples at pH 7 and 10. This work presents an important method to synthesize any desired CaP phase compositions by varying the pH level and subsequently performing heat treatment, which has a direct effect on morphology, crystallinity, and formation of different CaP powders.
Documentos Relacionados
- pH effect on the synthesis of magnetite nanoparticles by the chemical reduction-precipitation method
- Effect of initial pH on aflatoxin production.
- Effect of pH on the production of the Kanagawa hemolysin by Vibrio parahaemolyticus.
- Effect of pH and human saliva on protease production by Candida albicans.
- Acetic Acid Production by Clostridium thermoaceticum in pH-Controlled Batch Fermentations at Acidic pH