A novel Z-scheme graphitic C_(3)N_(4)/reduced TiO_(2)microsphere(g-C_(3)N_(4)/r-TiO_(2))has been successfully synthesized by a solvothermal method.The as-prepared samples with different contents of g-C_(3)N_(4)were ch...A novel Z-scheme graphitic C_(3)N_(4)/reduced TiO_(2)microsphere(g-C_(3)N_(4)/r-TiO_(2))has been successfully synthesized by a solvothermal method.The as-prepared samples with different contents of g-C_(3)N_(4)were characterized by X-ray diffraction,electron paramagnetic resonance,scanning electron microscope,UV evis.diffuse reflectance and photoluminescence spectra.The r-TiO_(2)microspheres are aggregated on the surface of g-C_(3)N_(4)sheets in the as-prepared g-C_(3)N_(4)/r-TiO_(2)composites.All g-C_(3)N_(4)/r-TiO_(2)catalysts show enhanced photocatalytic activity for the degradation of rhodamine B under visible light irradiation.It could be attributed to these influences of oxygen vacancy(changing the band gap of TiO_(2)),the large specific surface area(providing much more active sites for photocatalytic reaction),and the synergetic effect between g-C_(3)N_(4)and r-TiO_(2)(promoting the separation for photoinduced electron-hole pairs).Moreover,the Z-scheme carriers transfer mechanism in the photocatalytic process has been discussed through trapping experiments of active species.The work demonstrates the strategies of the construction of Z-scheme carriers transfer system,the introduction of oxygen vacancy and structure designing are beneficial to design materials toward solar energy conversion like contaminant degradation.展开更多
基金This work is supported by Six Talents Peak Project in Jiangsu Province(2011-ZBZZ045)Jiangsu Province Ordinary University Graduate Student Innovation Project(201710299111H).
文摘A novel Z-scheme graphitic C_(3)N_(4)/reduced TiO_(2)microsphere(g-C_(3)N_(4)/r-TiO_(2))has been successfully synthesized by a solvothermal method.The as-prepared samples with different contents of g-C_(3)N_(4)were characterized by X-ray diffraction,electron paramagnetic resonance,scanning electron microscope,UV evis.diffuse reflectance and photoluminescence spectra.The r-TiO_(2)microspheres are aggregated on the surface of g-C_(3)N_(4)sheets in the as-prepared g-C_(3)N_(4)/r-TiO_(2)composites.All g-C_(3)N_(4)/r-TiO_(2)catalysts show enhanced photocatalytic activity for the degradation of rhodamine B under visible light irradiation.It could be attributed to these influences of oxygen vacancy(changing the band gap of TiO_(2)),the large specific surface area(providing much more active sites for photocatalytic reaction),and the synergetic effect between g-C_(3)N_(4)and r-TiO_(2)(promoting the separation for photoinduced electron-hole pairs).Moreover,the Z-scheme carriers transfer mechanism in the photocatalytic process has been discussed through trapping experiments of active species.The work demonstrates the strategies of the construction of Z-scheme carriers transfer system,the introduction of oxygen vacancy and structure designing are beneficial to design materials toward solar energy conversion like contaminant degradation.
