Ultrasound-assisted synthesis of mesoporous zirconia-hydroxyapatite nanocomposites and their dual surface affinity for Cr3+/Cr2O7(2-) ions.

摘要: Zirconia-hydroxyapatite nanocomposites were prepared by sol-gel deposition of zirconium oxide from a alkoxide in the presence apatite colloidal suspension under ultrasonication. The material porosity evolves mainly microporous zirconia to mesoporous hydroxyapatite, with decreasing surface area and increasing pore volume. XRD studies indicate that phase is well-preserved within composite materials. homogeneous dispersion colloids network was supported TEM observations nitrogen sorption measurements. (31)P solid-state NMR suggest partial dissolution may have occurred during preparation, leading adsorption phosphate species on particles. This confirmed after thermal treatment demonstrate preferred formation tetragonal over monoclinic ZrO(2) hydroxyapatite. In order investigate properties these novel materials, Pb(2+), Cr(3+), Cr(2)O(7)(2-) evaluated. Metal cations preferentially adsorbed apatite-rich composites, whereas shows good affinity for zirconia-rich phases. Zirconia-apatite materials showed most promising performance terms recyclability. These combine microporosity, mesoporosity dual appear as interesting metal ion remediation also find applications biomaterials.