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Biogenic N-P-codoped TiO₂: Synthesis, characterization and photocatalytic properties

Han, Ting, Fan, Tongxiang, Chow, Suk-Kwun, Zhang, Di
Bioresource technology 2010 v.101 no.17 pp. 6829-6835
X-ray diffraction, X-ray photoelectron spectroscopy, absorption, anions, cations, crops, crystals, irradiation, lamps, metals, nitrogen, oxides, phosphorus, red light, seeds
Four typical kinds of crop seeds are studied as non-metallic bio-precursors to synthesize biogenic N-P-codoped TiO₂ (BNP-TiO₂). The as-prepared BNP-TiO₂ 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-TiO₂ 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-TiO₂ 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-TiO₂, of which the degradation rate is almost three times that of common TiO₂. Circled photocatalytic degradation also shows good photocatalytic stability of BNP-TiO₂. This work may pave a new and facile pathway of utilizing discarded biomass to synthesize desirable element-doped metal oxides based on biomass precursors.