MICROBIOLOGICAL PRECIPITATION, MORPHOLOGY AND THERMAL BEHAVIOR OF BARIUM HYDROGEN PHOSPHATE

摘要

The barium hydrogen phosphate (BHP) precipitate was induced using enzymes in the Bacillus subtilis reproduction and structure, morphology and thermal properties of the barium hydrogen phosphate precipitate were characterized by Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS), X-ray techniques (XRD), scanning electron microscope (SEM), thermogravimetric-differential scanning calorimetry (TG-DSC) analysis. There is no obvious difference in the composition and structure but the diffraction intensity. Morphology of BHP via microbiological precipitation differs from chemical and biomimetic process, and its brick-like shape is observed. Compared with chemical synthesis, there are bigger total weight-loss (7.47%) and lower decomposition or melting points (355.5°C) of BHP by microbiological precipitation, possibly caused by organic matrices.