Lanthanum doped bismuth layer structured ferroelectrics （BLSFs） Ca1 - x LaxBi4 （Ti0.9W0. 1 ）4O15 （ x = 0, 0.2, 0.3, 0.4, 0.6） ceramics were prepared by solid-state reaction method. X-ray diffraction （XRD） patt...Lanthanum doped bismuth layer structured ferroelectrics （BLSFs） Ca1 - x LaxBi4 （Ti0.9W0. 1 ）4O15 （ x = 0, 0.2, 0.3, 0.4, 0.6） ceramics were prepared by solid-state reaction method. X-ray diffraction （XRD） patterns showed that single phase was formed when x = 0 - 0.6. The effects of La^3＋ doping on dielectric, piezoelectric and ferroelectric properties of Ca1-xLaxBi4（Ti0.9W0.1）4O15 ceramics were studied. Ca0.7La0.3Bi4（Ti0.9W0.1）4O15 ceramic had optimal properties, its dielectric constant was 166.85, dielectric loss was 0.0063, piezoelectric strain constant was 11 pc·N^-1, remanent polarization was 18.1μC·cm^-2 and coercive field was 118 kV·cm^-1. SEM micrographs showed that the grains of CaBi4Ti4O15-based ceramics were plate-like. The results of energy spectrum analysis （EDS） showed that La^3＋ incorporation could increase Bi/Ca ratio.展开更多
A series of La-doped ZnO(La/ZnO)nanofibers were prepared by electrospinning-calcination technology and characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),ul...A series of La-doped ZnO(La/ZnO)nanofibers were prepared by electrospinning-calcination technology and characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),ultraviolet-visible(UV-Vis)absorption spectroscopy and specific surface area analysis.The effect of numerous operational parameters involving calcination temperature,La doping amount,La-doped ZnO concentration and initial Rhodamine B(Rh B)concentration on photocatalytic efficiency of the composite has been analyzed by using Rh B for degradation under the illumination of visible light.Under optimum conditions,ZnO doped with 1.5 at.%La achieved 94.31%Rh B degradation after 510 min of visible light illumination.The kinetic data of La/ZnO catalyst for Rh B photodegradation fitted the Langmuir-Hinshelwood first-order(LHFO)kinetic model well.展开更多
Elemental doping is an effective strategy to enhance photocatalytic activity and extend the light absorption range of single-component photocatalysts.In this work,a series of La-doped CeO_(2) nanorods(La-CeO_(2)-x) wi...Elemental doping is an effective strategy to enhance photocatalytic activity and extend the light absorption range of single-component photocatalysts.In this work,a series of La-doped CeO_(2) nanorods(La-CeO_(2)-x) with La content of 1 wt%-15 wt% are synthesized by a simple hydrothermal method and further used as photocatalyst for sulfamerazine(SMR) degradation.The prepared La-CeO_(2)-x nanorods exhibit a great improvement in electron-hole pair migration and visible-light response due to the synergistic effect of abundant oxygen vacancies and heterogeneous elements(La).Consequently,La-CeO_(2)-x exhibited excellent visible-light photocatalytic performances and chemical stability for SMR degradation,the La-CeO_(2)-5 sample achieved the highest SMR degradation rate of 81%,which was 3.4 times higher than that of the original CeO_(2).Furthermore,three possible degradation pathways of SMR in La-CeO_(2) photocatalytic reactions were proposed by liquid chromatography-mass spectrometry technique.Finally,density functional theory calculations were carried out to provide an in-depth understanding of the structure-performance relationships.Considering its excellent properties and better photocatalytic performance,this study demonstrates that La doping in CeO_(2) is an effective way to increase oxygen vacancy and improve the photochemical properties of photocatalysts.展开更多
Tin dioxide(SnO2) and La-doped(1%,5%,10% in mass ratio) SnO2 samples were prepared via a hydrothermal method. The as-prepared powders were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM) ...Tin dioxide(SnO2) and La-doped(1%,5%,10% in mass ratio) SnO2 samples were prepared via a hydrothermal method. The as-prepared powders were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM) . Results showed that the particle size of SnO2 decreased gradually with the increase of the doped La element. When used as anode materials of Li ion battery,the La-doped samples exhibited better cycling performance than the pure SnO2,and the cycling performance of the La-doped samples got better and better with the increase of the doped La. The better electrochemical performance of the doped material could be attributed to the doping of La element,which not only enabled SnO2 powders to have a good dispersivity but also reduced their particle size.展开更多
基金the financial support from the National Science Foundations of China(No.21171091)the Natural Science Foundation of Higher Education Institutions in Anhui Province(KJ2012A217,KJ2012B136)~~
文摘Lanthanum doped bismuth layer structured ferroelectrics （BLSFs） Ca1 - x LaxBi4 （Ti0.9W0. 1 ）4O15 （ x = 0, 0.2, 0.3, 0.4, 0.6） ceramics were prepared by solid-state reaction method. X-ray diffraction （XRD） patterns showed that single phase was formed when x = 0 - 0.6. The effects of La^3＋ doping on dielectric, piezoelectric and ferroelectric properties of Ca1-xLaxBi4（Ti0.9W0.1）4O15 ceramics were studied. Ca0.7La0.3Bi4（Ti0.9W0.1）4O15 ceramic had optimal properties, its dielectric constant was 166.85, dielectric loss was 0.0063, piezoelectric strain constant was 11 pc·N^-1, remanent polarization was 18.1μC·cm^-2 and coercive field was 118 kV·cm^-1. SEM micrographs showed that the grains of CaBi4Ti4O15-based ceramics were plate-like. The results of energy spectrum analysis （EDS） showed that La^3＋ incorporation could increase Bi/Ca ratio.
基金financially supported by National Natural Science Foundation of China(No.51406141,51803093 and 51903123)Natural Science Foundation of Fujian Province,China(No.2020J01419,No.2020J05220 and No.2020J01393)+1 种基金Natural Science Foundation of Jiangsu Province,China(BK20180770 and BK20190760)The Open Fund of Fujian Provincial Key Laboratory of Eco-Industrial Green Technology,China(WYKF-EIGT2020-3).
文摘A series of La-doped ZnO(La/ZnO)nanofibers were prepared by electrospinning-calcination technology and characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),ultraviolet-visible(UV-Vis)absorption spectroscopy and specific surface area analysis.The effect of numerous operational parameters involving calcination temperature,La doping amount,La-doped ZnO concentration and initial Rhodamine B(Rh B)concentration on photocatalytic efficiency of the composite has been analyzed by using Rh B for degradation under the illumination of visible light.Under optimum conditions,ZnO doped with 1.5 at.%La achieved 94.31%Rh B degradation after 510 min of visible light illumination.The kinetic data of La/ZnO catalyst for Rh B photodegradation fitted the Langmuir-Hinshelwood first-order(LHFO)kinetic model well.
基金financially supported by the National Natural Science Foundation of China (No.52300206)the Natural Science Foundation of Jiangsu Province (No.BK20230705)+3 种基金the Industry-University Research Cooperation Project of Jiangsu Province,China (No.BY20221227)Natural Science Foundation of Jiangsu Higher Education Institutions of China (No.22KJB610014)the Talent-Recruiting Program of Nanjing Institute of Technology (No.YKJ202124)the Open Fund of Advanced Industrial Technology Research Institute,Nanjing Institute of Technology (No. XJY202110)。
文摘Elemental doping is an effective strategy to enhance photocatalytic activity and extend the light absorption range of single-component photocatalysts.In this work,a series of La-doped CeO_(2) nanorods(La-CeO_(2)-x) with La content of 1 wt%-15 wt% are synthesized by a simple hydrothermal method and further used as photocatalyst for sulfamerazine(SMR) degradation.The prepared La-CeO_(2)-x nanorods exhibit a great improvement in electron-hole pair migration and visible-light response due to the synergistic effect of abundant oxygen vacancies and heterogeneous elements(La).Consequently,La-CeO_(2)-x exhibited excellent visible-light photocatalytic performances and chemical stability for SMR degradation,the La-CeO_(2)-5 sample achieved the highest SMR degradation rate of 81%,which was 3.4 times higher than that of the original CeO_(2).Furthermore,three possible degradation pathways of SMR in La-CeO_(2) photocatalytic reactions were proposed by liquid chromatography-mass spectrometry technique.Finally,density functional theory calculations were carried out to provide an in-depth understanding of the structure-performance relationships.Considering its excellent properties and better photocatalytic performance,this study demonstrates that La doping in CeO_(2) is an effective way to increase oxygen vacancy and improve the photochemical properties of photocatalysts.
基金Project supported by the National Natural Science Foundation of China (20871107)Henan Outstanding Youth Science Fund (0612002700)the Natural Science Foundation of the Education Department of Henan Province (2009A150031)
文摘Tin dioxide(SnO2) and La-doped(1%,5%,10% in mass ratio) SnO2 samples were prepared via a hydrothermal method. The as-prepared powders were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM) . Results showed that the particle size of SnO2 decreased gradually with the increase of the doped La element. When used as anode materials of Li ion battery,the La-doped samples exhibited better cycling performance than the pure SnO2,and the cycling performance of the La-doped samples got better and better with the increase of the doped La. The better electrochemical performance of the doped material could be attributed to the doping of La element,which not only enabled SnO2 powders to have a good dispersivity but also reduced their particle size.
