Mesoporous Pb3Nb2O8 photocatalysts were synthesized by the evaporation‐induced self‐assembly (EISA) method. Ag was deposited on the surface of mesoporous Pb3Nb2O8 by a facile photoreduction process. The as‐prepared...Mesoporous Pb3Nb2O8 photocatalysts were synthesized by the evaporation‐induced self‐assembly (EISA) method. Ag was deposited on the surface of mesoporous Pb3Nb2O8 by a facile photoreduction process. The as‐prepared samples were characterized by TG‐DSC, XRD, N2 adsorption, HR‐TEM andUV‐Vis spectroscopy. The results revealed that mesoporous Pb3Nb2O8 has a large specific surfacearea and uniform pore size distribution both before and after Ag deposition. The photodegradationof 2‐propanol and acetaldehyde gas under visible‐light (λ > 420 nm) irradiation was employed toevaluate the photocatalytic activities of the samples. The results showed that the photocatalyticactivity of mesoporous Pb3Nb2O8 is greatly improved by the Ag co‐catalyst. These mesoporousPb3Nb2O8 exhibit photocatalytic activities as much as 41 times higher when compared with thePb3Nb2O8 prepared by the solid state reaction method. The content of loaded Ag ranged from 0.5%to 5% (Ag2SO4). The optimal loading was determined to be 1% corresponding the highest photocatalyti cactivity. These results clearly indicate that the activity of Pb3Nb2O8 can be improved to obtain an outstanding performance for the photodegradation of organic pollutants.展开更多
The effective monitoring of trace carcinogens in the environment and daily necessities is very important for humans.Here,Ag-loaded iron hydroxide(Ag/Fe(OH)_(3))was designed as an excellent surface-enhanced Raman scatt...The effective monitoring of trace carcinogens in the environment and daily necessities is very important for humans.Here,Ag-loaded iron hydroxide(Ag/Fe(OH)_(3))was designed as an excellent surface-enhanced Raman scattering(SERS)substrate and used for the trace detection of carcinogenic aromatic amine p-aminoazobenzene(PAAB).Due to the weak binding ability of Fe^(3+)with OH^(−),Fe(OH)_(3)presents a strong coordination ability with Ag than Co(OH)_(2)and Ni(OH)_(2),resulting in the prominent adjustability of Ag/Fe(OH)_(3),including the localized surface plasmon resonance(LSPR)property and energy band structure.On the one hand,the dielectric environment of Ag nanoparticles is changed due to the coordination effect of Ag and OH^(−),among which the LSPR of Ag/Fe(OH)_(3)in the visible region is significantly enhanced.On the other hand,the energy band gap of Ag/Fe(OH)_(3)is reduced by increasing the content of Ag,achieving effective photo-induced charge transfer(PICT)under excitation at 633 nm.Comprehensively,an enhancement factor(EF)of 1.23×10^(6)was achieved for 4-ATP molecules through the synergistic interaction of LSPR and PICT.Importantly,Ag/Fe(OH)_(3)presents an ultra-low detection limit for PAAB(10^(−9)M),which is of great significance for the trace detection of carcinogenic aromatic amines.展开更多
Semiconductor photocatalysis provides a promising potential solution to the challenging issue of clean energy production.Construction of multijunction systems is an effective strategy to overcome the serious drawbacks...Semiconductor photocatalysis provides a promising potential solution to the challenging issue of clean energy production.Construction of multijunction systems is an effective strategy to overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts.Here,we report a novel quaternary heterogeneous photocatalyst fabricated by loading Ag nanoparticles onto ZnO nanowires and subsequent simultaneous formation of core/shell structured ZnO@ZnS and Ag@Ag_(2)S heterojunctions via a one-step anion-exchange sulfuration reaction process.The resulting four-component ZnO@ZnS/Ag@Ag_(2)S multijunction photocatalyst exhibits a high hydrogen evolution activity(140.3μmol g^(-1))under simulated solar light irradiation in 5 h,far exceeding those of bare ZnO(30.8μmol g^(-1)),ZnO@ZnS(92.8μmol g^(-1))and ZnO/Ag(45.1μmol g^(-1))counterparts.The enhanced photocatalytic activity can be attributed to the synergetic effect of the formation of both Z-scheme and type II core/shell heterojunctions,favoring light absorption and separation of photogenerated electron-hole pairs in the composite.This work provides a facile,controlled method for the fabrication of multicomponent heterostructures used for efficient solar water splitting.展开更多
基金supported by the National Natural Science Foundation of China (11274150, 11574124)the Education Minister of Liaoning Province (JG2016ZD0015)the Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University~~
文摘Mesoporous Pb3Nb2O8 photocatalysts were synthesized by the evaporation‐induced self‐assembly (EISA) method. Ag was deposited on the surface of mesoporous Pb3Nb2O8 by a facile photoreduction process. The as‐prepared samples were characterized by TG‐DSC, XRD, N2 adsorption, HR‐TEM andUV‐Vis spectroscopy. The results revealed that mesoporous Pb3Nb2O8 has a large specific surfacearea and uniform pore size distribution both before and after Ag deposition. The photodegradationof 2‐propanol and acetaldehyde gas under visible‐light (λ > 420 nm) irradiation was employed toevaluate the photocatalytic activities of the samples. The results showed that the photocatalyticactivity of mesoporous Pb3Nb2O8 is greatly improved by the Ag co‐catalyst. These mesoporousPb3Nb2O8 exhibit photocatalytic activities as much as 41 times higher when compared with thePb3Nb2O8 prepared by the solid state reaction method. The content of loaded Ag ranged from 0.5%to 5% (Ag2SO4). The optimal loading was determined to be 1% corresponding the highest photocatalyti cactivity. These results clearly indicate that the activity of Pb3Nb2O8 can be improved to obtain an outstanding performance for the photodegradation of organic pollutants.
基金financially supported by the National Natural Science Foundation of China(52022006,12274018,52002380,and 51902012)China Postdoctoral Science Foundation(2022M710300)+2 种基金Ningbo 3315 Innovative Teams Program(Grant No.2019A-14-C)the Member of Youth Innovation Promotion Association Foundation of CAS(Grant No.2023310)Fundamental Research Funds for the Central Universities(FRF-TP-22-001C1).
文摘The effective monitoring of trace carcinogens in the environment and daily necessities is very important for humans.Here,Ag-loaded iron hydroxide(Ag/Fe(OH)_(3))was designed as an excellent surface-enhanced Raman scattering(SERS)substrate and used for the trace detection of carcinogenic aromatic amine p-aminoazobenzene(PAAB).Due to the weak binding ability of Fe^(3+)with OH^(−),Fe(OH)_(3)presents a strong coordination ability with Ag than Co(OH)_(2)and Ni(OH)_(2),resulting in the prominent adjustability of Ag/Fe(OH)_(3),including the localized surface plasmon resonance(LSPR)property and energy band structure.On the one hand,the dielectric environment of Ag nanoparticles is changed due to the coordination effect of Ag and OH^(−),among which the LSPR of Ag/Fe(OH)_(3)in the visible region is significantly enhanced.On the other hand,the energy band gap of Ag/Fe(OH)_(3)is reduced by increasing the content of Ag,achieving effective photo-induced charge transfer(PICT)under excitation at 633 nm.Comprehensively,an enhancement factor(EF)of 1.23×10^(6)was achieved for 4-ATP molecules through the synergistic interaction of LSPR and PICT.Importantly,Ag/Fe(OH)_(3)presents an ultra-low detection limit for PAAB(10^(−9)M),which is of great significance for the trace detection of carcinogenic aromatic amines.
基金Shenzhen Science and Technology Innovation Committee(Grant No.JCYJ20170817111443306,JCYJ20170412154335393 and KQTD2016022619584022)Southern University of Science and Technology(Grant No.G01296001)+1 种基金Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control(Grant No.2017B030301012)NSFC(No.51802143)。
文摘Semiconductor photocatalysis provides a promising potential solution to the challenging issue of clean energy production.Construction of multijunction systems is an effective strategy to overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts.Here,we report a novel quaternary heterogeneous photocatalyst fabricated by loading Ag nanoparticles onto ZnO nanowires and subsequent simultaneous formation of core/shell structured ZnO@ZnS and Ag@Ag_(2)S heterojunctions via a one-step anion-exchange sulfuration reaction process.The resulting four-component ZnO@ZnS/Ag@Ag_(2)S multijunction photocatalyst exhibits a high hydrogen evolution activity(140.3μmol g^(-1))under simulated solar light irradiation in 5 h,far exceeding those of bare ZnO(30.8μmol g^(-1)),ZnO@ZnS(92.8μmol g^(-1))and ZnO/Ag(45.1μmol g^(-1))counterparts.The enhanced photocatalytic activity can be attributed to the synergetic effect of the formation of both Z-scheme and type II core/shell heterojunctions,favoring light absorption and separation of photogenerated electron-hole pairs in the composite.This work provides a facile,controlled method for the fabrication of multicomponent heterostructures used for efficient solar water splitting.
