Preparation and characterization of Ag2CrO4/few layer boron nitride hybrids for visible-light-driven photocatalysis
Xiang‐Feng WuZehua ZhaoYang SunHui LiChenxu ZhangYijin WangYu LiuYu-Duan WangXinyue YangXiaodong Gong
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Rhodamine B
Degradation
Visible spectrum
A novel FeVO₄/g-C₃N₄ composite photocatalyst was synthesized via a simple mixing-calcination method and characterized by various techniques including the Brunauer–Emmett–Teller method, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and an electrochemical method. The photocatalytic activity was evaluated by degradation of rhodamine B (RhB). Results indicated that the FeVO₄/g-C₃N₄ composite exhibited a much higher photocatalytic activity than pure g-C₃N₄ under visible light illumination. The rate constant of RhB degradation for the optimal FeVO₄/g-C₃N₄ composite (5.0% FeVO₄/g-C₃N₄) is approximately 2.2 times that of pure g-C₃N₄. The formation of a heterojunction structure between FeVO₄ and g-C₃N₄ which efficiently promoted the separation of electron–hole pairs was believed to be the origin of the enhanced photoactivity.
Rhodamine B
Nanorod
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Complex analysis of influence of durability of cutters with plates made of polycrystalline super hard materials (PSTM) based on cubic boron nitride (CBN) on probability of completion of technological operation was performed. The probability of cutter operation was defined and curves of reliability of operation of the tool were constructed.
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Rhodamine B
Methylene blue
Visible spectrum
Diffuse reflection
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The synthesis and preparation,properties and application of cubic Boron materials,such as cubic Boron Nitride and Polycrystalline cubic Boron Nitride,were mainly given.The special properties of Polycrystalline cubic Boron Nitride and its application as tool materials were emphasized,and finally its development is also introduced in this paper.
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In this study, we report the design and fabrication of a series of visible-light-responsive photocatalysts based on one-dimensional iron terephthalate (MIL-53(Fe)) microrods hybridized with graphene (GR) and experimentally demonstrate their remarkably improved visible-light-induced photocatalytic activity. During the solvothermal process, the reduction of graphene oxide (GO) is accompanied by the MIL-53(Fe) crystallization, which endows them with effective interfacial contact, thus facilitating the transfer of photogenerated charge to lower the recombination rate of excited carriers. The GR/MIL-53(Fe)-H2O2 systems exhibit significantly higher photocatalytic activity toward degrading Rhodamine B (RhB) than that of bare MIL-53(Fe)-H2O2 under visible light irradiation. The introduced H2O2 induces photosynergistic generation of more amounts of hydroxyl radicals to contribute to the improved photocatalytic activity. This work could open a new way for the exploration and utilization of metal–organic framework (MOF)-based crystalline materials for light harvesting.
Rhodamine B
Visible spectrum
Degradation
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A series of BiPO4/Ag3PO4 composite photocatalysts with different doping proportion of BiPO4 and Ag3PO4 were synthesized using AgNO3 Bi(NO3)3·5H2O and NaH2PO4 as raw materials by a co-precipitation method at different calcination temperature.The properties of the photocatalysts,including light-absorption band,morphology and photoluminescence,etc were characterized by UV-Vis diffuse reflectance spectra,scanning electron microscopy and fluorescence spectrum.The results showed that these composite photocatalysts absorb visible light with the wavelength of 400~500 nm,and hence are novel visible light responsive photocatalysts.The photocatalytic activity of the photocatalysts was tested in degradation of Rhodamine B.With the increase of doping ratio,the photocatalytic activity decreases.With the enhancement of calcination temperature,the photocatalytic activity firstly increases,and then decreases.The photocatalyst with the BiPO4/Ag3PO4 molar percent of 5% that was obtained by calcining at 350 ℃ showed the optimal activity,which is the complete degradation of 200 mL rhodamine B solution with a concentration of 12 mg/L within 40 minutes.
Rhodamine B
Visible spectrum
Degradation
Rhodamine
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Synthesis of Fe 3 O 4 /ZnO-Cu nanocomposite photocatalyst has been conducted. The synthesis was carried out using the co-precipitation method with the variation of Cu concentration and modification by Fe 3 O 4 magnetic material. As synthesized photocatalysts were characterized using FTIR, XRD, TEM, and SR UV-Visible. Photocatalytic activities of samples were evaluated through Rhodamine B degradation under visible light irradiation. The results showed that a sample with Fe 3 O 4 /ZnO-Cu 1% has smaller band gap energy of 2.90 eV and the highest photocatalytic activity than pure ZnO or Fe 3 O 4 -modified ZnO (Fe 3 O 4 /ZnO-Cu 0%) under visible light. The percentage of Rhodamine B degradation was approximately 89.41% during 120 min of visible light illumination. Moreover, the photocatalyst materials could be easily separated after photocatalysis which is due to the magnetic property of Fe 3 O 4 material. Therefore, Cu-doped ZnO with Fe 3 O 4 modification has been an efficient and effective visible-light-induced photocatalyst in removing non-biodegradable Rhodamine B dyes.
Rhodamine B
Visible spectrum
Photodegradation
Rhodamine
Degradation
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Heterogeneous visible light photon-Fenton catalyst,BiFeO3,was successfully prepared by sol-gel method.Its phase micro-morphology was characterized by X-ray diffraction(XRD),scanning electron microscope(SEM) and UV-vis absorbance spectra separately.Performance of heterogeneous visible light photon-Fenton system for Rhodamine B degradation was investigated;it was found that Rhodamine B could be completely decomposed in 2.50 h visible light irradiation by BiFeO3-H2O2,which confirmed that BiFeO3 was an efficient visible light heterogeneous photo-Fenton catalyst.Four de-ethylation products were discovered by liquid chromatography-mass spectrometry(LC-MS) method,the possible photodegradation pathway of Rhodamine B in visible light-BiFeO3-H2O2 system was gradual de-ethylation.
Rhodamine B
Visible spectrum
Photodegradation
Absorbance
Degradation
Rhodamine
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Electrical impedance spectroscopy (dielectric or electrochemical impedance spectroscopy) is a widespread characterization method for solids or fluids in industrial applications. Here we present a novel combination of the electrical impedance spectroscopy with its thermal equivalent, that we thus call "thermal impedance spectroscopy". With this combination, a deeper insight of the fluid properties, especially at different fluid mixtures, is possible.
Characterization
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