Ternary multifunctional A<sub>1</sub>Zn<sub>y</sub>Zr<sub>z</sub>O<sub>n</sub> catalysts are prepared by introducing A-site transition metals with the redox capability i...Ternary multifunctional A<sub>1</sub>Zn<sub>y</sub>Zr<sub>z</sub>O<sub>n</sub> catalysts are prepared by introducing A-site transition metals with the redox capability into binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub>. Structure and morphology were investigated by means of XRD, BET and FESEM, respectively. Activity data showed that Cr addition exhibited obvious beneficial effect to promote isobutene production from direct conversion of bio-ethanol compared to other A-site metal dopants. A significant higher yield of isobutene over Cr-promoted Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> catalyst was also observed with respect to its binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> counterpart. The choice of A-site metal is of prime importance in the isobutene production, catalyzing mainly the ethanol dehydrogenation, meanwhile the appropriate addition of zinc on the catalyst surface is also essential for good isobutene yield.展开更多
The massive consumption and discharge of pharmaceutical antibiotics have driven researchers to explore environment-friendly and effective technology to eliminate them.Herein,a novel flower-like Ag_(6)Si_(2)O_(7)/Bi_(2...The massive consumption and discharge of pharmaceutical antibiotics have driven researchers to explore environment-friendly and effective technology to eliminate them.Herein,a novel flower-like Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile in situ precipitation strategy and then applied to degrade pharmaceutical antibiotics.The as-obtained Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) heterojunction with strong interfacial coupling effects exhibited superior photocatalytic property in comparison with pristine Bi_(2)WO_(6) and Ag_(6)Si_(2)O_(7) for the degradation of ciprofloxacin(CIP)and tetracycline hydrochloride(TC)under visible light.The optimized Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6)(ASO/BWO-3)showed the maximum photocatalytic performance,and its rate constant for the degradation of CIP was as high as 0.0217 min^(-1),exceeding that of pristine Bi_(2)WO_(6) and Ag_(6)Si_(2)O_(7) by approximately 14.5-and 9.8-fold,respectively.The trapping experiments and ESR analyses revealed that the principal active species responsible for pollutant removal are h^(+)and·O_(2)-species.The PL analysis and EIS measurements further demonstrated that Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) possesses a high separation rate of photogenerated electrons and holes.Its extraordinary photocatalytic performance is ascribed to the synergistic interactions of the Z-scheme hetero-structure and surface plasmon resonance(SPR)effect of the Ag nanoparticles.Remarkably,a separation reaction system was delicately designed and employed to demonstrate the significance of the direct contact between Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) and contaminants for antibiotic degradation.This research may provide a new design concept for constructing highly efficient and stable Z-scheme heterojunction photocatalysts for treating pharmaceutical wastewater.展开更多
文摘Ternary multifunctional A<sub>1</sub>Zn<sub>y</sub>Zr<sub>z</sub>O<sub>n</sub> catalysts are prepared by introducing A-site transition metals with the redox capability into binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub>. Structure and morphology were investigated by means of XRD, BET and FESEM, respectively. Activity data showed that Cr addition exhibited obvious beneficial effect to promote isobutene production from direct conversion of bio-ethanol compared to other A-site metal dopants. A significant higher yield of isobutene over Cr-promoted Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> catalyst was also observed with respect to its binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> counterpart. The choice of A-site metal is of prime importance in the isobutene production, catalyzing mainly the ethanol dehydrogenation, meanwhile the appropriate addition of zinc on the catalyst surface is also essential for good isobutene yield.
基金supported by the Fundamental Research Funds for Zhejiang Provincial Universities and Research Institutes(2019JZ00009)the National Natural Science Foundation of China(51708504)+2 种基金the Public Projects of Zhejiang Province(LGN18E080003)the Science and Technology Project of Zhoushan(2017C41006)the Zhaoqing City of Science and Technology Innovation Project(201804030101).
文摘The massive consumption and discharge of pharmaceutical antibiotics have driven researchers to explore environment-friendly and effective technology to eliminate them.Herein,a novel flower-like Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile in situ precipitation strategy and then applied to degrade pharmaceutical antibiotics.The as-obtained Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) heterojunction with strong interfacial coupling effects exhibited superior photocatalytic property in comparison with pristine Bi_(2)WO_(6) and Ag_(6)Si_(2)O_(7) for the degradation of ciprofloxacin(CIP)and tetracycline hydrochloride(TC)under visible light.The optimized Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6)(ASO/BWO-3)showed the maximum photocatalytic performance,and its rate constant for the degradation of CIP was as high as 0.0217 min^(-1),exceeding that of pristine Bi_(2)WO_(6) and Ag_(6)Si_(2)O_(7) by approximately 14.5-and 9.8-fold,respectively.The trapping experiments and ESR analyses revealed that the principal active species responsible for pollutant removal are h^(+)and·O_(2)-species.The PL analysis and EIS measurements further demonstrated that Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) possesses a high separation rate of photogenerated electrons and holes.Its extraordinary photocatalytic performance is ascribed to the synergistic interactions of the Z-scheme hetero-structure and surface plasmon resonance(SPR)effect of the Ag nanoparticles.Remarkably,a separation reaction system was delicately designed and employed to demonstrate the significance of the direct contact between Ag_(6)Si_(2)O_(7)/Bi_(2)WO_(6) and contaminants for antibiotic degradation.This research may provide a new design concept for constructing highly efficient and stable Z-scheme heterojunction photocatalysts for treating pharmaceutical wastewater.
