Porous hydroxyapatite-TiO2 nanocomposites from natural phosphates and their decolorization properties - Photoactive hydroxyapatite-TiO2 nanopowdersH. Bouyarmane, S. Saoiabi, I. El Hanbali, M. El Karbane, A. Rami, S. Masse, A. Laghzizil and T. CoradinEur. Phys. J. Special Topics, 224 9 (2015) 1861-1869DOI: https://doi.org/10.1140/epjst/e2015-02505-9