The novel CuO-SnO2 nanocomposite oxide photocatalysts were prepared by simple co-precipitation method, and characterized by X- ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement an...The novel CuO-SnO2 nanocomposite oxide photocatalysts were prepared by simple co-precipitation method, and characterized by X- ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of CuO-SnO2, evaluated using the photodegradation of Acid Blue 62 as a probe reaction under the irradiation of Xenon light, were also found to be related to the calcination temperature and the molar ratio of Cu to Sn. The maximum photocatalytic activity of the CuO-SnO2 photocatalyst was observed to be calcined at 500~C for 3 h （the molar ratio of Cu to Sn was 1：1） due to the sample with good crystallization and high surface area. It also showed much higher photocatalytic activity in treatment dye wastewater under simulated sunlight irradiation compared to Degussa P25 TiO2.展开更多
BiOBr/ZnO composite photocatalysts were prepared by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microsco...BiOBr/ZnO composite photocatalysts were prepared by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM), UV–Vis diffusion reflectance spectroscopy(DRS) and photoluminescence(PL) spectroscopy, respectively. The photocatalytic activities were evaluated by the degradation of methyl blue(MB) under the simulated sunlight irradiation. Among all the samples, the BiOBr/ZnO composite with a mole ratio of 3:1(Bi:Zn) exhibited the best photocatalytic activity. The improvement of photocatalytic activity was mainly attributed to the low recombination ratio of photo-induced electron-hole pairs. The possible photocatalytic mechanism was discussed on the basis of the band structures of BiOBr and ZnO.展开更多
The g-C3N4/Ag/GO(CNAG)photocatalysts were synthesized by a facile two-step reaction route.The as-prepared CNAG samples were characterized by X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FTIR),X-ray p...The g-C3N4/Ag/GO(CNAG)photocatalysts were synthesized by a facile two-step reaction route.The as-prepared CNAG samples were characterized by X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL)and ultraviolet-visible diffuse reflectance spectroscopy techniques(UV-vis DRS).The photocatalytic activity was obtained by degrading rhodamine B(RhB)under simulated sunlight and the results showed that photocatalytic activity of CNAG was much higher than that of pure g-C3N4 and g-C3N4/Ag.When the mass ratio of GO was 6%,the as-prepared CNAG-6%sample possessed the highest photocatalytic activity and the kinetic constant of RhB degradation was 0.077 min-1,which was almost 4.3 times higher than that of pure g-C3N4(0.018 min-1)and 2.5 times higher than that of the g-C3N4/Ag(0.031 min-1)composite,respectively.The toxicity of CNAG samples was assessed via seed germination experiment and no significant inhibitory effect was observed.The enhanced photocatalytic activity could be attributed to the synergistic effect of partial surface plasma resonance(SPR)effect of Ag,strong visible light absorption and the high separation efficiency of photon-generated carrier.The CNAG-6%sample exhibited excellent stability during the cycle experiment.Finally,a possible photocatalytic mechanism was proposed.展开更多
基金Project supported by the National Natural Science Foundation of China(No. 20677008)the Innovation Foundation of Donghua University for Doctors(No. 113-06-001900621).
文摘The novel CuO-SnO2 nanocomposite oxide photocatalysts were prepared by simple co-precipitation method, and characterized by X- ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement and UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of CuO-SnO2, evaluated using the photodegradation of Acid Blue 62 as a probe reaction under the irradiation of Xenon light, were also found to be related to the calcination temperature and the molar ratio of Cu to Sn. The maximum photocatalytic activity of the CuO-SnO2 photocatalyst was observed to be calcined at 500~C for 3 h （the molar ratio of Cu to Sn was 1：1） due to the sample with good crystallization and high surface area. It also showed much higher photocatalytic activity in treatment dye wastewater under simulated sunlight irradiation compared to Degussa P25 TiO2.
文摘BiOBr/ZnO composite photocatalysts were prepared by a simple hydrothermal method. The as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM), UV–Vis diffusion reflectance spectroscopy(DRS) and photoluminescence(PL) spectroscopy, respectively. The photocatalytic activities were evaluated by the degradation of methyl blue(MB) under the simulated sunlight irradiation. Among all the samples, the BiOBr/ZnO composite with a mole ratio of 3:1(Bi:Zn) exhibited the best photocatalytic activity. The improvement of photocatalytic activity was mainly attributed to the low recombination ratio of photo-induced electron-hole pairs. The possible photocatalytic mechanism was discussed on the basis of the band structures of BiOBr and ZnO.
基金supported by the National Natural Science Foundation of China(11374080)。
文摘The g-C3N4/Ag/GO(CNAG)photocatalysts were synthesized by a facile two-step reaction route.The as-prepared CNAG samples were characterized by X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL)and ultraviolet-visible diffuse reflectance spectroscopy techniques(UV-vis DRS).The photocatalytic activity was obtained by degrading rhodamine B(RhB)under simulated sunlight and the results showed that photocatalytic activity of CNAG was much higher than that of pure g-C3N4 and g-C3N4/Ag.When the mass ratio of GO was 6%,the as-prepared CNAG-6%sample possessed the highest photocatalytic activity and the kinetic constant of RhB degradation was 0.077 min-1,which was almost 4.3 times higher than that of pure g-C3N4(0.018 min-1)and 2.5 times higher than that of the g-C3N4/Ag(0.031 min-1)composite,respectively.The toxicity of CNAG samples was assessed via seed germination experiment and no significant inhibitory effect was observed.The enhanced photocatalytic activity could be attributed to the synergistic effect of partial surface plasma resonance(SPR)effect of Ag,strong visible light absorption and the high separation efficiency of photon-generated carrier.The CNAG-6%sample exhibited excellent stability during the cycle experiment.Finally,a possible photocatalytic mechanism was proposed.
