The heterojunction strategy was used to overcome the drawbacks of AgIO3 for its wide band gap and of BiVO4 for its low charge-separation efficiency. The photocatalytic per-formances of the as-prepared AgIO3/BiVO4 were...The heterojunction strategy was used to overcome the drawbacks of AgIO3 for its wide band gap and of BiVO4 for its low charge-separation efficiency. The photocatalytic per-formances of the as-prepared AgIO3/BiVO4 were assessed by the photodegradation of rhodamine B（Rh B） and tetracycline hydrochloride antibiotics（TC） under visible-light irradiation. All the as-prepared samples showed remarkable enhanced photocatalytic efficiency than pure AgIO3 and BiVO4. Especially, 40% AgIO3/BiVO4 exhibited optimum photocatalytic activities among all the prepared samples. The improvements may be ascribed to the synergetic effect between AgIO3 and BiVO4 including matching potentials and effective charge separation. Radical trap experiments determined that h＋ radical plays a significant role in the photodegradation of RhB while e-is not the dominating reactive species.展开更多
A photocatalyst Cu-BiVO4 was synthesized by the hydrothermal method and was characterized by XRD, UV-vis DRS, and N2 adsorption-desorption measurement. The catalytic activity of the Cu-BiVO4 samples was studied on des...A photocatalyst Cu-BiVO4 was synthesized by the hydrothermal method and was characterized by XRD, UV-vis DRS, and N2 adsorption-desorption measurement. The catalytic activity of the Cu-BiVO4 samples was studied on desulfurization of thiophene dissolved in n-octane, which was used as a model light oil, via photocatalytic oxidation reaction under illumination by visible light. The catalyst characterization results indicated that the loading of Cu on the catalyst did not change the crystal phase of BiVO4, and the crystallinity of the Cu-BiVO4 sample was found to be better at pH=7. The Cu-BiVO4 samples presented a significant bathochromic shift of the absorption band in the visible region, and the absorption intensity increased for the composite catalyst. The desulfurization experiments showed that the Cu-BiVO4 sample prepared at a pH value of 7 had a better catalytic activity. Under proper operating conditions, the desulfurization rate of the model compound achieved by Cu-BiVO4 sample prepared at pH=7 could reach as high as 90%.展开更多
To enhance the photocatalytic activity of B-BiVO4,Ni-doped B?BiVO4photocatalyst(Ni-B-BiVO4)was synthesized through sol-gel and impregnation method.The photocatalysts were characterized by XPS,XRD,SEM,EDS,BET and UV-Vi...To enhance the photocatalytic activity of B-BiVO4,Ni-doped B?BiVO4photocatalyst(Ni-B-BiVO4)was synthesized through sol-gel and impregnation method.The photocatalysts were characterized by XPS,XRD,SEM,EDS,BET and UV-Vis DRS techniques.The results showed that single or double doping did not change the crystalline structure and morphology,but the particle size decreased with Ni doping.The band gap energy absorption edge of Ni-B-BiVO4shifted to a longer wavelength compared with undoped,B or Ni single doped BiVO4.More V4+and surface hydroxyl oxygen were observed in BiVO4after Ni-B co-doping.When the optimal mass fraction of Ni is0.30%,the degradation rate of MO in50min is95%for0.3Ni-B-BiVO4sample which also can effectively degrade methyl blue(MB),acid orange(AOII)II and rhodamine B(RhB).The enhanced photocatalytic activity is attributed to the synergistic effects of B and Ni doping.展开更多
基金supported by the National Natural Science Foundation of China(41672278)the Projects of Fujian Provincial Department of Education(JAT160340)+3 种基金the Fujian Provincial Natural Science Foundation Projects(2017Y4001)the Science and Technology Plan Projects of Fuzhou(2017-G-96,2017-G-90)the Scientific Research Projects Funded Start-up Funds of Fujian University of Technology(GY-Z160065)National Undergraduate Training Program for Innovation and Entrepreneurship(201710388074)
文摘The heterojunction strategy was used to overcome the drawbacks of AgIO3 for its wide band gap and of BiVO4 for its low charge-separation efficiency. The photocatalytic per-formances of the as-prepared AgIO3/BiVO4 were assessed by the photodegradation of rhodamine B（Rh B） and tetracycline hydrochloride antibiotics（TC） under visible-light irradiation. All the as-prepared samples showed remarkable enhanced photocatalytic efficiency than pure AgIO3 and BiVO4. Especially, 40% AgIO3/BiVO4 exhibited optimum photocatalytic activities among all the prepared samples. The improvements may be ascribed to the synergetic effect between AgIO3 and BiVO4 including matching potentials and effective charge separation. Radical trap experiments determined that h＋ radical plays a significant role in the photodegradation of RhB while e-is not the dominating reactive species.
基金supported by the National Natural Science Foundation of China (No. 21003103)the Nature Scientific Research Foundation of Shaanxi Provincial Education Office of China (No. 2010JS061)Natural Science Foundation Program of Yan’an University (YD2011-19)
文摘A photocatalyst Cu-BiVO4 was synthesized by the hydrothermal method and was characterized by XRD, UV-vis DRS, and N2 adsorption-desorption measurement. The catalytic activity of the Cu-BiVO4 samples was studied on desulfurization of thiophene dissolved in n-octane, which was used as a model light oil, via photocatalytic oxidation reaction under illumination by visible light. The catalyst characterization results indicated that the loading of Cu on the catalyst did not change the crystal phase of BiVO4, and the crystallinity of the Cu-BiVO4 sample was found to be better at pH=7. The Cu-BiVO4 samples presented a significant bathochromic shift of the absorption band in the visible region, and the absorption intensity increased for the composite catalyst. The desulfurization experiments showed that the Cu-BiVO4 sample prepared at a pH value of 7 had a better catalytic activity. Under proper operating conditions, the desulfurization rate of the model compound achieved by Cu-BiVO4 sample prepared at pH=7 could reach as high as 90%.
基金Projects (21207093,51004072) supported by the National Natural Science Foundation of China for YouthProject (LJQ2014023) supported by the Liaoning Excellent Talents in University,China+1 种基金Project (L20150178) supported by the General Scientific Research Projects Foundation of Liaoning Educational Committee,ChinaProject (N140303002) supported by the Fundamental Research Funds for the Central Universities,China
文摘To enhance the photocatalytic activity of B-BiVO4,Ni-doped B?BiVO4photocatalyst(Ni-B-BiVO4)was synthesized through sol-gel and impregnation method.The photocatalysts were characterized by XPS,XRD,SEM,EDS,BET and UV-Vis DRS techniques.The results showed that single or double doping did not change the crystalline structure and morphology,but the particle size decreased with Ni doping.The band gap energy absorption edge of Ni-B-BiVO4shifted to a longer wavelength compared with undoped,B or Ni single doped BiVO4.More V4+and surface hydroxyl oxygen were observed in BiVO4after Ni-B co-doping.When the optimal mass fraction of Ni is0.30%,the degradation rate of MO in50min is95%for0.3Ni-B-BiVO4sample which also can effectively degrade methyl blue(MB),acid orange(AOII)II and rhodamine B(RhB).The enhanced photocatalytic activity is attributed to the synergistic effects of B and Ni doping.
