Selenite sorption by carbonate substituted apatite

The sorption of selenite, SeO32−, by carbonate substituted hydroxylapatite was investigated using batch kinetic and equilibrium experiments. The carbonate substituted hydroxylapatite was prepared by a precipitation method and characterized by SEM, XRD, FT-IR, TGA, BET and solubility measurements. Th...

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Bibliographic Details
Published in:Environmental pollution (1987) 2016-11, Vol.218 (C), p.1102-1107
Main Authors: Moore, Robert C., Rigali, Mark J., Brady, Patrick
Format: Article
Language:English
Subjects:
Adsorption
Apatite
Apatites - chemistry
Carbonated apatite
ENVIRONMENTAL SCIENCES
Kinetics
MATERIALS SCIENCE
Selenious Acid - chemistry
Selenite
Selenium
Solubility
Sorption
Spectroscopy, Fourier Transform Infrared
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Summary:The sorption of selenite, SeO32−, by carbonate substituted hydroxylapatite was investigated using batch kinetic and equilibrium experiments. The carbonate substituted hydroxylapatite was prepared by a precipitation method and characterized by SEM, XRD, FT-IR, TGA, BET and solubility measurements. The material is poorly crystalline, contains approximately 9.4% carbonate by weight and has a surface area of 210.2 m2/g. Uptake of selenite by the carbonated hydroxylapatite was approximately an order of magnitude higher than the uptake by uncarbonated hydroxylapatite reported in the literature. Distribution coefficients, Kd, determined for the carbonated apatite in this work ranged from approximately 4200 to over 14,000 L/kg. A comparison of the results from kinetic experiments performed in this work and literature kinetic data indicates the carbonated apatite synthesized in this study sorbed selenite 23 times faster than uncarbonated hydroxylapatite based on values normalized to the surface area of each material. The results indicate carbonated apatite is a potential candidate for use as a sorbent for pump-and-treat technologies, soil amendments or for use in permeable reactive barriers for the remediation of selenium contaminated sediments and groundwaters. The sorption of selenite by carbonated apatite including distribution coefficeints and kinetic data are reported.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2016.08.063