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Construction of oxygen defective ZnO/ZnFe_(2)O_(4) yolk-shell composite with photothermal effect for tetracycline degradation:Performance and mechanism insight

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Chinese Chemical Letters 2023年第1期34卷 452-456页

作者： Ke Zhang Hongyang Cao afzal dar Danqing Li Lina Zhou Chuanyi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Oxygen vacancy induced photothermal effect is of great significant but lack of adequate attentions for environmental *** this paper,green recyclable ZnO/ZnFe_(2)O_(4) with oxygen vacancy was prepared by a solvothermal-calcination *** UV-vis light capture ability of ZnO/ZnFe_(2)O_(4) microspheres is improved with the multiple light reflections due to the yolk-shell structure,and the oxygen vacancy expands the absorption range of photocatalyst and enhances photothermal *** optimized photocatalyst can heat the solution from room temperature to 70°C within 60 min of visible light illumination,and the light to heat conversion efficiency is achieved by 61.3%.Compared with the degradation efficiency at 20°C,photothermal catalysis achieves a stable degradation in 80 min,and the degradation efficiency is increased by 41.5%.This can be attributed to the fact that light induced thermal energy accelerates the migration of electrons and holes,and promotes the diffusion of free radicals by heating active centers in *** active species contributing to the degradation,in order of importance,are the superoxide radical,hydroxyl radical,hole and *** light-to-thermal assisted photocatalysis with ZnO/ZnFe_(2)O_(4) provides a new sight for the pollution control in the future practical applications.

关键词： Photocatalysis Photothermal Oxygen vacancy Yolk-shell Tetracycline

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Numerical Simulation and Experimental Verification of CMOD in SENT Specimen: Application on FCGR of Welded Tool Steel

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Acta Metallurgica Sinica(English Letters) 2013年第1期26卷 92-96页

作者： Amir SULTAN Riffat Asim PASHA Mifrah ALI Muhammad Zubair KHAN Muhammad afzal KHAN Naeem Ullah dar Masood SHAH Department of Mechanical Engineering University of Engineering and Technology International Islamic University

Single-edged notched tension （SENT） specimen is used to study the fatigue crack growth rate （FCGR） behavior of AISI 50100 steel using MTS 810. Calibration tests are run to get plots of crack mouth opening displacement （CMOD） vs. load and CMOD vs. crack length-to-width ratio with the known crack lengths. Numerical simulation is also done to try to establish a relation between crack length and CMOD. FCGR of welded and un-welded specimens are plotted against stress intensity factor range to show the effect of welding on fatigue crack growth rate of AISI 50100 steel. The experimentally obtained CMOD values are compared with values obtained by numerical simulation using ABAQUS/StandardTM software package. Results show that numerical values are in good agreement with experimental data for small crack lengths and lower values of applied load,

关键词： Tool steel Weld Single-edged notched tension (SENT) CMOD Fatigue crackgrowth rate (FCGR)

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