Publicado

2017-01-01

Síntesis de monetita pura por reacción heterogénea ácido base.

Synthesis of pure monetite by heterogeneous acid-base reaction

Palabras clave:

monetita, brushita, DCPA, fosfatos de calcio, DCPD, hidroxiapatita, síntesis de fosfatos (es)
monetite, brushite, DCPA, calcium phosphates, DCPD, hydroxyapatite, phosphates synthesis (en)

Autores/as

  • Luis Carlos Moreno Aldana Universidad Nacional de Colombia
  • Davier Olarte Cárdenas Universidad Nacional de Colombia
  • Edgar Delgado Mejía Universidad Nacional de Colombia

Se estudiaron cinco variaciones del procedimiento de síntesis de monetita modificando la agitación, la velocidad de adición de ácido fosfórico, la homogenización y la temperatura de secado. Los productos se caracterizaron por difracción de rayos X (DRX), microscopía electrónica de barrido (SEM-EDS), relación Ca/P (por titulación de calcio con permanganato de potasio y valoración colorimétrica de fósforo por la formación del complejo azul de molibdeno) y espectroscopía infrarroja con transformada de Fourier (FTIR). Los resultados de DRX, espectroscopia infrarroja y la relación Ca/P señalan que el fosfato sintetizado corresponde a monetita pura. Se encontró que los factores de síntesis que más afectan las propiedades de composición, estructura cristalina, relación Ca/P y forma y tamaño de grano de los fosfatos sintetizados son la relación estequiométrica de los reactantes y la mecanoactivación de sólido con sobrenadante.

 

Five variations of the monetite (M) synthesis were evaluated modifying the stirring, the phosphoric acid addition rate, the homogeneity and the drying temperature. Products were assessed by means of XRD, FTIR, SEM-EDS analysis and chemical assay of Ca/P (calcium by titration with potassium permanganate and phosphorus by colorimetric assessment of the molybdenum blue complex). X-ray diffraction, infrared spectroscopy and Ca/P ratio indicate that the synthesized phosphate corresponds to pure monetite. It was found that the most influential factors affecting composition, crystal size and Ca/P were stoichiometry and ballmilling mechanoactivation.

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Citas

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