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Journal of Materials Science

, Volume 50, Issue 23, pp 7568–7582 | Cite as

Conversion of waste animal bones into porous hydroxyapatite by alkaline treatment: effect of the impregnation ratio and investigation of the activation mechanism

  • Unai Iriarte-Velasco
  • Irene Sierra
  • Lorena Zudaire
  • Jose L. Ayastuy
Original Paper

Abstract

Microporous biochars, mainly composed by hydroxyapatite (HAp), were prepared from animal waste bones. In this study, a three-step procedure including pre-pyrolysis, chemical treatment with NaOH, KOH and K2CO3, and pyrolysis was investigated. The effects of the activation agent and its concentration were analysed by N2 adsorption–desorption, SEM, EDX, FTIR, and XRD techniques. The activation mechanism was investigated by TG-MS. FTIR and XRD data confirm that the obtained biochars were mainly composed of HAp. K2CO3 was the most effective with porosity being increased by 30 % (up to 234 m2/g) compared to non-alkali-treated sample. New pores were generated mainly in the microporous range. Analysis of the pyrolysis gases by MS revealed that the main effect of the alkali treatment is the incorporation of OH ions, which then react with bone matrix to generate porosity. Other gas-phase reactions, such as reverse WGS and methanation reactions, promoted by K2CO3, may be involved in the activation process. In contrast, KOH caused little modification of the HAp structure. Statistical analysis supported the relationship among the release of certain compounds during pyrolysis and the textural properties of the final material.

Keywords

Gasification K2CO3 Textural Property Impregnation Ratio Bone Char 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors wish to thank the Basque Government (UFI 11/39 (UPV/EHU) and S-PE13UN100 (SAI13/254)) for their financial support.

Supplementary material

10853_2015_9312_MOESM1_ESM.doc (100 kb)
Supplementary material 1 (DOC 100 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Unai Iriarte-Velasco
    • 1
  • Irene Sierra
    • 1
  • Lorena Zudaire
    • 1
  • Jose L. Ayastuy
    • 2
  1. 1.Department of Chemical Engineering, Faculty of PharmacyUniversity of the Basque Country UPV/EHUVitoriaSpain
  2. 2.Department of Chemical Engineering, Faculty of Science and TechnologyUniversity of the Basque Country UPV/EHULeioaSpain

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