| 内容提要: |
In this report, I explained our work from four parts. First part is introduction. Recent years, solar-light-induced photocatalysis based on semiconductor has seen a renewed interest in the fields of degradation of pollutants, water splitting, CO2 reduction, solar cells. Coupling TiO2 with narrow-bandgap photocatalysts may cover both UV and visible light more efficiently. Moreover, when their band structures are properly matched, the photo-induced charge separation can be enhanced and the charge recombination and photo-corrosion can be inhibited. In this work., we prepared W18O49 by dissolving WCl6 in absolute ethanol and heating the mixture. WO3 was prepared by calcining the as-prepared powders. W18O49/TiO2 and WO3/TiO2 hybrids were obtained by simply mixing the related semiconductors. Thirdly ,We proof the structure of W18O49 and WO3 by XRD patterns, SEM and TEM images, UV-vis spectrometer, TOC measurement and so on. In a conclusion, W18O49/TiO2 hybrids show significant synergetic promotion on the photoactivity, due to the well-matched band energies of the two individuals that improves the photo-induced charge transfer and separation with electrons moving to W18O49 and holes to TiO2.The spatial charge separation also inhibits the self-oxidation of W18O49 and gives excellent photostability. W18O49/TiO2 is much more active than WO3/TiO2 attributed to the inherent good reductive capability and wide visible light absorption of oxygen vacancies in W18O49.•O2‾ and hole, especially the former, are the active species inducing the photodegradation of MO. |