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  • Title: Biogenic N-P-codoped TiO2: synthesis, characterization and photocatalytic properties.
    Author: Han T, Fan T, Chow SK, Zhang D.
    Journal: Bioresour Technol; 2010 Sep; 101(17):6829-35. PubMed ID: 20395135.
    Abstract:
    Four typical kinds of crop seeds are studied as non-metallic bio-precursors to synthesize biogenic N-P-codoped TiO(2) (BNP-TiO(2)). The as-prepared BNP-TiO(2) samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen-adsorption measurement and UV-Vis spectroscopy. The results show that BNP-TiO(2) possesses single anatase phase with mesopore structures, and nitrogen and phosphorus contained in original crop seeds are self-doped into the lattice as anions and cations, respectively. Besides, BNP-TiO(2) exhibits a strongly enhanced absorption in the UV-Vis light range and red shift of the absorption edge, implicating the highly efficient light-harvesting capacity and sensitization towards visible light. Furthermore, experiments of crystal violet degradation under Xe lamp irradiation indicate superior photocatalytic activity of BNP-TiO(2), of which the degradation rate is almost three times that of common TiO(2). Circled photocatalytic degradation also shows good photocatalytic stability of BNP-TiO(2). This work may pave a new and facile pathway of utilizing discarded biomass to synthesize desirable element-doped metal oxides based on biomass precursors.
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