Ternary Ag/AgC l/BiO IO3 composite photocatalysts are prepared by a facile method. Enhanced visible-light absorption and charge carrier separation are achieved after the introduction of Ag/AgC l particles into BiO IO3...Ternary Ag/AgC l/BiO IO3 composite photocatalysts are prepared by a facile method. Enhanced visible-light absorption and charge carrier separation are achieved after the introduction of Ag/AgC l particles into BiO IO3 systems,as revealed by ultraviolet-visible diffuse-reflectance spectrometry,photocurrent response and electrochemical impedance spectroscopy. The Ag/AgC l/BiO IO3 composites are applied to the visible-light photocatalytic oxidization of NO in air and exhibit an enhanced activity for NO removal in comparison with Ag/AgC l and pure BiO IO3. A possible photocatalytic mechanism for Ag/AgC l/BiO IO3 is proposed,which is related to the surface plasmon resonance effects of Ag metal and the effective carrier separation ability of BiO IO3. This work provides insight into the design and preparation of BiO IO3-based materials with enhanced visible-light photocatalysis ability.展开更多
采用微波辅助合成方法将WO3固载到金属有机骨架MIL-101(Cr)上,借助于沉积沉淀–光还原方法将Ag/AgCl和WO3/MIL-101复合在一起,制备出Ag/AgCl@WO3/MIL-101可见光催化剂。利用FT-IR、XRD、UV-Vis-DRS和XPS测试技术对该催化剂进行了表征。...采用微波辅助合成方法将WO3固载到金属有机骨架MIL-101(Cr)上,借助于沉积沉淀–光还原方法将Ag/AgCl和WO3/MIL-101复合在一起,制备出Ag/AgCl@WO3/MIL-101可见光催化剂。利用FT-IR、XRD、UV-Vis-DRS和XPS测试技术对该催化剂进行了表征。结果表明,Ag/AgCl和WO3的引入没有改变MIL-101的结构,催化剂在可见光区有强烈的光吸收。当WO3的负载量为0.3(w)%,Ag的负载量为3.4(w)%时,Ag/AgCl@WO3/MIL-101对70 mL 20 mg/L的罗丹明B溶液的降解率达到100%,并且该催化剂具有较好的稳定性。展开更多
The ternary plasmonic Ag Cl/Ag/g-C_3N_4 photocatalysts were successfully fabricated by a modified deposition–precipitation method, through which Ag/Ag Cl nanoparticles(5–15 nm in size) were evenly dispersed on the s...The ternary plasmonic Ag Cl/Ag/g-C_3N_4 photocatalysts were successfully fabricated by a modified deposition–precipitation method, through which Ag/Ag Cl nanoparticles(5–15 nm in size) were evenly dispersed on the surface of g-C_3N_4. The Ag Cl/Ag/g-C_3N_4 composites exhibited higher photocatalytic activity than Ag/Ag Cl and g-C_3N_4. The enhanced photocatalytic performance could be attributed to an efficient separation of electron–hole pairs through a Z-scheme mechanism, in which Ag nanoparticles acted as charge separation centers.展开更多
In this study, the Ag/Ag Cl/WO3 plasmonic Z-scheme photocatalysts with different contents of Ag/Ag Cl nanoparticles（NPs） were prepared through a facile ultrasonic precipitation method in geothermal water,wherein the...In this study, the Ag/Ag Cl/WO3 plasmonic Z-scheme photocatalysts with different contents of Ag/Ag Cl nanoparticles（NPs） were prepared through a facile ultrasonic precipitation method in geothermal water,wherein the geothermal water served as the chlorine source. Then the photocatalytic activity was investigated by degradation of 4-Aminobenzoic acid（4-ABA） under visible-light irradiation. It was found that the as-prepared 50 wt% Ag/Ag Cl/WO3 photocatalyst showed the highest photocatalytic efficiency with 25.12 and 3.53 times higher than those of pure WO3 and Ag/Ag Cl, respectively. The active species trapping experiments indicated that h＋and ·O2-were key factors in 4-ABA photodegradation process. The possible plasmonic Z-scheme photocatalytic mechanism of photocatalytic reaction for 4-ABA degradation was proposed based on systematical characterizations. We hope this paper could give new ideas for further exploiting geothermal energy to design and fabricate highly efficient visible-light-driven photocatalysts for environmental remediation.展开更多
A series of novel AgCl/AgaCO3 heterostructured photocatalysts with different AgCl contents （5 wt%, 10 wt%, 20 wt%, and 30 wt%） were prepared by facile coprecipitation method at room temperature. The resulting produc...A series of novel AgCl/AgaCO3 heterostructured photocatalysts with different AgCl contents （5 wt%, 10 wt%, 20 wt%, and 30 wt%） were prepared by facile coprecipitation method at room temperature. The resulting products were characterized by powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, and ultraviolet-visible diffuse reflectance spectroscopy （UV-Vis DRS）, respectively. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange （MO） under UV light irradiation. With the optimal AgCl content of 20 wt%, the AgCl/AgECO3 composite exhibits the greatest enhancement in photocatalytic degradation efficiency. Its first-order reaction rate constant （0.67 h^-1） is 5.2 times faster than that of Ag2CO3 （0.13 h^-1）, and 16.8 times faster than that of AgCl （0.04 h^-1）. The formation of AgCl/AgaCO3 heterostructure could effectively suppress the recombination of the photo-generated electron and hole, resulting in an increase in photocatalytic activity.展开更多
基金supported by the National Natural Science Foundation of China(5147807051108487)the Science and Technology Project from Chongqing Education Commission(KJ1400617)~~
文摘Ternary Ag/AgC l/BiO IO3 composite photocatalysts are prepared by a facile method. Enhanced visible-light absorption and charge carrier separation are achieved after the introduction of Ag/AgC l particles into BiO IO3 systems,as revealed by ultraviolet-visible diffuse-reflectance spectrometry,photocurrent response and electrochemical impedance spectroscopy. The Ag/AgC l/BiO IO3 composites are applied to the visible-light photocatalytic oxidization of NO in air and exhibit an enhanced activity for NO removal in comparison with Ag/AgC l and pure BiO IO3. A possible photocatalytic mechanism for Ag/AgC l/BiO IO3 is proposed,which is related to the surface plasmon resonance effects of Ag metal and the effective carrier separation ability of BiO IO3. This work provides insight into the design and preparation of BiO IO3-based materials with enhanced visible-light photocatalysis ability.
文摘采用微波辅助合成方法将WO3固载到金属有机骨架MIL-101(Cr)上,借助于沉积沉淀–光还原方法将Ag/AgCl和WO3/MIL-101复合在一起,制备出Ag/AgCl@WO3/MIL-101可见光催化剂。利用FT-IR、XRD、UV-Vis-DRS和XPS测试技术对该催化剂进行了表征。结果表明,Ag/AgCl和WO3的引入没有改变MIL-101的结构,催化剂在可见光区有强烈的光吸收。当WO3的负载量为0.3(w)%,Ag的负载量为3.4(w)%时,Ag/AgCl@WO3/MIL-101对70 mL 20 mg/L的罗丹明B溶液的降解率达到100%,并且该催化剂具有较好的稳定性。
基金financial aid from the National Natural Science Foundation of China(NSFC No.51472133)
文摘The ternary plasmonic Ag Cl/Ag/g-C_3N_4 photocatalysts were successfully fabricated by a modified deposition–precipitation method, through which Ag/Ag Cl nanoparticles(5–15 nm in size) were evenly dispersed on the surface of g-C_3N_4. The Ag Cl/Ag/g-C_3N_4 composites exhibited higher photocatalytic activity than Ag/Ag Cl and g-C_3N_4. The enhanced photocatalytic performance could be attributed to an efficient separation of electron–hole pairs through a Z-scheme mechanism, in which Ag nanoparticles acted as charge separation centers.
基金the financial support by the National Natural Science Foundation of China (grant no. 51272107 and 51372118)the Doctor Discipline Special Research Foundation of Chinese Ministry of Education (grant no. 20133219110015)
文摘In this study, the Ag/Ag Cl/WO3 plasmonic Z-scheme photocatalysts with different contents of Ag/Ag Cl nanoparticles（NPs） were prepared through a facile ultrasonic precipitation method in geothermal water,wherein the geothermal water served as the chlorine source. Then the photocatalytic activity was investigated by degradation of 4-Aminobenzoic acid（4-ABA） under visible-light irradiation. It was found that the as-prepared 50 wt% Ag/Ag Cl/WO3 photocatalyst showed the highest photocatalytic efficiency with 25.12 and 3.53 times higher than those of pure WO3 and Ag/Ag Cl, respectively. The active species trapping experiments indicated that h＋and ·O2-were key factors in 4-ABA photodegradation process. The possible plasmonic Z-scheme photocatalytic mechanism of photocatalytic reaction for 4-ABA degradation was proposed based on systematical characterizations. We hope this paper could give new ideas for further exploiting geothermal energy to design and fabricate highly efficient visible-light-driven photocatalysts for environmental remediation.
基金financially supported by the National Natural Science Foundation of China(Nos.21067004 and21263005)the Young Science and Technology Project of Jiangxi Province Natural Science Foundation(No.20133BAB21003)+1 种基金the Young Scientist Training Project of Jiangxi Province(No.20122BCB23015)the Science and Technology Landing Project of Jiangxi Province Education Office(No.KJLD14046)
文摘A series of novel AgCl/AgaCO3 heterostructured photocatalysts with different AgCl contents （5 wt%, 10 wt%, 20 wt%, and 30 wt%） were prepared by facile coprecipitation method at room temperature. The resulting products were characterized by powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, and ultraviolet-visible diffuse reflectance spectroscopy （UV-Vis DRS）, respectively. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange （MO） under UV light irradiation. With the optimal AgCl content of 20 wt%, the AgCl/AgECO3 composite exhibits the greatest enhancement in photocatalytic degradation efficiency. Its first-order reaction rate constant （0.67 h^-1） is 5.2 times faster than that of Ag2CO3 （0.13 h^-1）, and 16.8 times faster than that of AgCl （0.04 h^-1）. The formation of AgCl/AgaCO3 heterostructure could effectively suppress the recombination of the photo-generated electron and hole, resulting in an increase in photocatalytic activity.
