Ni(II) immobilization by bio-apatite materials: Appraisal of chemical, thermal and combined treatments
Animal bones are natural and rich source of calcium hydroxyapatite (HAP), which was found to be a good sorbent material for heavy metals and radionuclides. Various treatments can reduce the content of bone organic phase and improve sorption properties. In this study, sorption capacities of...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Association of the Chemical Engineers of Serbia
2016-01-01
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| Series: | Chemical Industry and Chemical Engineering Quarterly |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-9372/2016/1451-93721500024S.pdf |
| Summary: | Animal bones are natural and rich source of calcium hydroxyapatite (HAP),
which was found to be a good sorbent material for heavy metals and
radionuclides. Various treatments can reduce the content of bone organic
phase and improve sorption properties. In this study, sorption capacities of
raw bovine bones (B) and samples obtained by chemical treatment with NaOH
(BNaOH), by heating at 400 oC (B400) and by combined chemical and thermal
treatment (BNaOH+400), were compared, using Ni(II) ions as sorbates. Maximum
sorption capacities increased in the order B<BNaOH<B400<BNaOH+400. Based on
different sorption data and FT-IR analyses, the mechanism of Ni(II) sorption
was found to be complex, with participation of both HAP and organic phase
(when present). Sequential extraction analysis was applied for testing the
stability of Ni(II) ions sorbed by BNaOH+400. Majority of Ni(II) was found in
residual phase (65%) at lower level of sorbent loading, while with the
increase of sorbent saturation carbonate fraction became dominant (39 %).
According to the results, BNaOH+400 can be utilized in water purification
systems. As an apatite based material with low organic content and high
efficiency for Ni(II) sorption, it is also a good candidate for in-situ soil
remediation, particularly at lower contamination levels. [Projekat
Ministarstva nauke Republike Srbije, br. III 43009] |
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| ISSN: | 1451-9372 2217-7434 |