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Full-spectrum responsive photocatalytic activity via non-noble metal Bi decorated mulberry-like BiVO_(4)

Journal of Materials Science & Technology 2021年第24期83卷 102-112页

作者： Yaxin Bi Yanling Yang Xiao-Lei Shi Lei Feng Xiaojiang Hou Xiaohui Ye Li Zhang Guoquan Suo Siyu Lu Zhi-Gang Chen School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'an710021China Centre for Future Materials University of Southern QueenslandSpringfieldQLD4300Australia School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD4072Australia College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Due to its appropriate bandgap(~2.4 e V)and efficient light absorption,bismuth vanadate(Bi VO_(4))shows promising photocatalysis activity.However,the charge carrier recombination and poor electron transmission often induce poor photocatalytic performance.Herein,we report a new method to in-situ synthesize non-noble metal Bi decorated mulberry-like Bi VO_(4)by a two-step calcination process.Comprehensive characterizations reveal that non-noble metal Bi nanoparticles grown in-situ on Bi VO_(4)result in the red-shift of the absorbance edge,greatly extending the light absorption from the ultraviolet into the near-infrared region.The surface plasmon resonance excitation of Bi nanoparticles and synergetic effects between Bi and Bi VO_(4)effectively improve the photocatalytic efficiency and promote the separation of photoinduced electron-hole pairs in mulberry-like Bi VO_(4).Density functional theory(DFT)calculation results further verify that the electrons are transferred from Bi to Bi VO_(4)and the formation of·OH radical in Bi/Bi VO_(4)is attributed to the lower simulated free energy,which supports our experimental outcomes.This work provides a novel strategy to enhance light absorption and promote efficient solar utilization of photocatalysts for practical applications.

关键词： Bi BiVO_(4) Photocatalysis Full-spectrum Density functional theory

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Quantitative energy-dispersive X-ray fluorescence analysis for unknown samples using Full-spectrum least-squares regression

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Nuclear Science and Techniques 2019年第3期30卷 149-159页

作者： Yong-Li Liu Qing-Xian Zhang Jian Zhang Hai-Tao Bai Liang-Quan Ge The College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology

The Full-spectrum least-squares(FSLS) method is introduced to perform quantitative energy-dispersive X-ray fluorescence analysis for unknown solid samples.Based on the conventional least-squares principle, this spectrum evaluation method is able to obtain the background-corrected and interference-free net peaks, which is significant for quantization analyses. A variety of analytical parameters and functions to describe the features of the fluorescence spectra of pure elements are used and established, such as the mass absorption coefficient, the Gi factor, and fundamental fluorescence formulas. The FSLS iterative program was compiled in the C language. The content of each component should reach the convergence criterion at the end of the calculations. After a basic theory analysis and experimental preparation, 13 national standard soil samples were detected using a spectrometer to test the feasibility of using the algorithm. The results show that the calculated contents of Ti, Fe, Ni, Cu, and Zn have the same changing tendency as the corresponding standard content in the 13 reference samples. Accuracies of 0.35% and 14.03% are obtained, respectively, for Fe and Ti, whose standard concentrations are 8.82% and 0.578%, respectively. However, the calculated results of trace elements (only tens of lg/g) deviate from the standard values. This may be because of measurement accuracy and mutual effects between the elements.

关键词： Energy-dispersive X-ray fluorescence analysis Full-spectrum least-squares method Effective atomic number Mass attenuation coefficient Fundamental parameter method

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A cyan-emitting phosphor Ca3SiO4(Cl,Br)2:Eu2+ with high efficiency and good thermal stability for full-visible-spectrum LED lighting

A cyan-emitting phosphor Ca3SiO4(Cl,Br)2:Eu2+ with high effi...

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中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色...

作者： Yuan Zhu Lei Fu Di Wu JinFen Kuang Yan Liang Jiaqing Peng Xinyu Ye Fu Du Lei Chen School of Metallurgy and Chemistry Engineering Jiangxi University of Science and Technology Xuyu Optoelectronics Co. Ltd

CaSiOClBr:0.02Eucyan-green phosphors with high efficiency and good thermal stability were prepared via high temperature solid-state method.The crystal structure,luminescence properties and thermal stability of as-prepared phosphors were systematically investigated by means of X-ray diffraction (XRD),photoluminescence excitation spectra (PLE),photoluminescence spectra (PL),CIE coordinates and variable temperature spectra.With the increase of Brin CaSiOClBr:0.02Eu,the emission peak shifted from 502 nm to 491 nm under near-UV (n-UV) excitation,which can make amends for the cyan gap (480–520 nm) and realize high color rendering.The blue shift of the emission band can be ascribed to the small crystal field splitting and Stokes shift.Furthermore,the white LED devices was fabricated via blue-emitting Sr(PO)Cl:Eu,green-emitting YAGG:Ce,red-emitting (Ca,Sr)AlSiN:Eu,and the cyan phosphor CaSiO(Cl,Br):Euwith 410 nm-chip.The WLED exhibits a warm and bright white light with low correlated CCT (3969 K),high Ra (96.9),and CIE color coordinates of(0.3828,0.3810).The results indicate that CaSiOClBr:0.02Eucan be used as a potential candidate cyan phosphor for Full-spectrum warm white LED.

关键词： solid solution cyan phosphor Full-spectrum white LED

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