Add time:07/12/2019         Source:sciencedirect.com

In the present investigation the poorly crystalline hydroxyapatite was rapidly fabricated by the gel auto-ignition route using calcium nitrate tetra-hydrate and di-ammonium hydrogen orthophosphate as a starting materials and urea as a fuel. The produced powders were employed as adsorbents for uptake of disperse blue 60 from aqueous solution and the adsorption performance was spectrophotometrically studied to determine the appropriate condition for fabrication of amorphous hydroxyapatite. The effects of synthesis parameters such as fuel ratio, gel preparation pH, calcination temperature and the influence of processing factors like dye solution pH and material dosage on dye adsorption have been investigated, comparatively. The properties of products were characterized by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), dynamic light scattering (DLS) and scanning electron microscopy (SEM). The synthesized hydroxyapatite can supply a large quantity of active sites to enhance the uptake of dye. Although, the change in pH of synthesis condition shows a negligible variation in the adsorption efficiency, the acidic condition leads to formation of β-tricalcium phosphate. The stronger adsorption as well as the higher activity with disperse blue 60 was observed in pH of 2.0. In addition, the adsorption was found to be controlled by the calcination temperature. Furthermore, it was indicated that the dye adsorption on poorly crystalline hydroxyapatite prepared in the appropriate condition, fuel ratio of 0.50 and pH of 7.0, is well adjusted with Langmuir isotherm in which the maximum adsorption capacity was determined to be 4600 mg g−1, approximately.

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