Light down-converting characteristics of ZnO–Y2O2S:Eu3+ for visible light photocatalysis
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Keywords:
Visible spectrum
Methyl orange
Methylene blue
Rhodamine B
Degradation
A visible light active nitrogen-doped ZnO (N-ZnO) was synthesized using a solvent-free mechanochemical method and applied to degrade methylene blue (MB) dye in aqueous suspension. Results showed that nitrogen doping improved the photocatalytic activity of pristine ZnO by extending its spectral response to visible region. Using 2 g/L of N-ZnO, 98% MB with the initial concentration of 10 mg/L could be degraded within 2 h at pH 7 under 11.3 klux of visible light irradiation. After 6 th run, it still exhibited appreciable photocatalytic activity with 94% MB degradation, indicating its high reusability though a simple pretreatment was performed.
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Degradation
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TiO 2 was synthesized by a sol-gel method using chitosan as a structure-directing agent.The prepared nanoparticle was characterized using XRD, FESEM and HRTEM techniques.Nanoparticles prepared in this work exhibited spherical shape with particle size ranged 8-13nm.Parameters affect the photocatalytic degradation as catalyst dosage, initial dye concentration and pH examined for methyl orange (MO) and Rhodamine B (RhB) dyes.It was found that the degradation process strongly depends on these parameters.The reusability of the TiO 2 is investigated during five cycle experiments, the activity of the catalyst showed good activity at the cycles which indicates that the TiO 2 can be used repeatedly.
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Methyl orange
Degradation
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In the work, visible-light-driven hierarchi- cal Bi3.84W0.16O6.24 photocatalysts have been synthe- sized by a facile hydrothermal strategy. The micro- structures and photocatalytic activities of Bi3.84W0.16- O6.24 photocatalysts were finely tuned just by adjust- ing the pH values of reaction solutions with different alkalis. The as-prepared samples were physically characterized by X-ray powder diffraction, field- emission scanning electron microscopy, and ultra- violet-visible diffraction reflection spectroscopy. When evaluated by the photocatalytic degradation of methyl orange (MO) under the visible-light irra- diation, Bi3.84W0.16O6.24 samples with distinct mi- cro-structures showed different photocatalytic activities. Of Note, the hierarchical Bi3.84W0.16O6.24 sub-microspheres constructed by nanoflake building blocks demonstrated the highest photocatalytic ac- tivity forthe degradation of MO under the visible-light irradiation.
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Visible spectrum
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Methyl orange
Methylene blue
Rhodamine B
Rhodamine
Methylene
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Rhodamine B
Visible spectrum
Degradation
Rhodamine
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Methyl orange
Rhodamine B
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MoS2/TiO2 nanomaterial prepared by sol-gel process was characterized by XRD,UV-VIS-DRS,BET and so on.Meanwhile methylene blue(MB) was taken as the probe molecular to evaluate the visible light photocatalytic activity of the compound semiconductor materials.The effects of ration of MoS2 in composite catalyst,the initial concentration of methylene blue and the quantity of catalyst on the degradation rate of the methylene blue solution were investigated.The results show that the compound semiconductor materials exhibited the best photocatalytic activity being the decolorization proportion of methylene blue is 96.5% when the quantity of catalyst 0.5 g·L-1,the initial concentration of methylene blue is 0.284 mmol·L-1 under visible light.
Methylene blue
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Methylene
Degradation
Nanomaterials
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Flower-shaped CuO with hierarchical microstructures was successfully synthesized through an ultrasound-assisted aqueous chemical method. The comparative experiment results show that the phase and morphology of as-obtained products are greatly affected by the volume of ammonia and the time for keeping ultrasonic irradiation, respectively. The prepared CuO microflowers assembled by nanosheets with needle-like tips exhibit a much higher activity than the commercial CuO for degrading Rhodamine B. Additionally, the photocatalytic performance of as-prepared hierarchical CuO microflowers was also evaluated through the degradation of Methylene blue and Methyl orange under the same conditions.
Methyl orange
Rhodamine B
Methylene blue
Degradation
Rhodamine
Nanomaterials
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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
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Degradation
Rhodamine
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Methyl orange
Visible spectrum
Degradation
Diffuse reflection
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