Preparation, characterization, and stability of calcium zinc hydrophosphate

Journal Article · Mon Dec 01 04:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2008.01.022· OSTI ID:21195034

Xia, Xu; Weimin, Sun; Yunfeng, Xu; Qiang, Liu ^[1]

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1. School of Environmental Engineering, Shanghai University, Shanghai 200072 (China)

Calcium zinc hydrophosphate phases with different Zn/(Zn + Ca) molar ratios (x{sub Zn}, from 0 to 1) were synthesized using co-precipitation method at pH 10, 25 deg. C. X-ray diffraction, FT-IR spectroscopy and field emission scanning electron microscopy (FE-SEM) were used to characterize the synthesized products. Thermal behavior of the products was examined by thermal analytical instruments (TG-DSC-MS), while the chemical stability of the products was tested by toxicity characteristic leaching procedure (TCLP). The results showed that the phase constituents of formed calcium zinc hydrophosphate phases were related to the molar contents of Zn{sup 2+}. With the increase of x{sub Zn}, it formed calcium-deficient hydorxyapatite (CaHap), calcium zinc hydorxyapatite (CaZnHap), CaZn{sub 2}(PO{sub 4}){sub 2}.2H{sub 2}O, and Zn{sub 3}(PO{sub 4}){sub 2}.4H{sub 2}O, respectively. All the calcium zinc hydrophosphates were thermally stable up to 600 deg. C, and less Zn{sup 2+} leached in a wide pH range of 2-11, which indicated that calcium zinc hydrophosphate could effectively hold Zn{sup 2+} in their crystal phases with stabilization ratios of over 99.99%.

• OSTI ID: 21195034
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM PHOSPHATES
CALORIMETRY
COPRECIPITATION
CRYSTAL STRUCTURE
FOURIER TRANSFORMATION
INFRARED SPECTRA
LEACHING
SCANNING ELECTRON MICROSCOPY
STABILITY
SYNTHESIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
ZINC IONS
ZINC PHOSPHATES