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Fabrication of CdS-decorated mesoporous SiC hollow nanofibers for efficient visible-light-driven photocatalytic hydrogen production
摘要： In the present work, we reported the fabrication of CdS decorated mesoporous SiC hollow nanofibers for efficient visible-light-driven photocatalytic hydrogen production. The mesoporous SiC hollow nanofibers were firstly fabricated by electrospinning, followed by hydrothermal treatment to introduce the CdS nanoparticles decorated on the preformed fiber matrix, The resultant CdS/SiC hybrid photocatalysts were systematically characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM) and N2 adsorption. The as-fabricated CdS/SiC hybrids exhibited a robust stability with a release rate up to ~ 124.65?μmol?h?1?g?1 for photocatalytic H2 evolution driven by visible light, which was profoundly enhanced for more than 16 times to that of pristine SiC counterparts, and comparable to the state-of-the-art one of SiC-based photocatalysts.
关键词： CdS,SiC,photocatalytic hydrogen production,visible-light-driven,hollow nanofibers
更新于2025-09-10 09:29:36
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Preparation of core–shell nanostructured black nano-TiO <sub/>2</sub> by sol–gel method combined with Mg reduction
摘要： Black nano-TiO2 samples with core–shell nanostructure were successfully prepared by sol–gel method combined with Mg reduction using butyl titanate as titanium source and calcining at 500°C in air atmosphere and at 400–600°C in nitrogen atmosphere. The prepared black TiO2 samples were characterized by X-ray diffraction, high resolution transmission electron microscopy, Raman spectra, photoluminescence emission spectra, N2 adsorption–desorption, and ultraviolet–visible spectroscopy. The results show that the black TiO2 exhibits a crystalline core–disordered shell structure composed of disordered surface and oxygen vacancies, and the thickness of the disordered layer is about 2–3 nm. The optical absorption properties of black nano-TiO2 samples have been remarkably enhanced in visible light region. Compared with the white TiO2, the reduced black TiO2 samples exhibit enhanced photocatalytic hydrogen production under the full solar wavelength range of light, and the sample prepared with the Mg and TiO2 ratio of 9:1 calcined at 500 °C has the maximum hydrogen production rate.
关键词： core–shell nanostructure,Black nano-TiO2,photocatalytic hydrogen production,sol–gel method,Mg reduction
更新于2025-09-10 09:29:36
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Comparative Study on The Photocatalytic Hydrogen Production from Methanol over Cu-, Pd-, Co- and Au-Loaded TiO <sub/>2</sub>
摘要： Photocatalytic hydrogen production from a methanol-water solution was investigated in a semi-continuous reactor over different metal-loaded TiO2 catalysts under UltraViolet (UV) light irradiation. The catalysts were mainly prepared by the incipient wetness impregnation method by varying the metal weight ratio in the range of 1-10 wt%. The effects of metal loading and H2 pre-treatment on the photocatalytic activity were investigated. In addition, the activity of the catalysts was also compared with a reference Au-TiO2 catalyst from the World Gold Council (WGC). The photocatalysts were characterized by using X-Ray Diffraction (XRD) and N2 physisorption before and after the activity measurements. The photocatalytic activity decreased in the order of Pd > Au > Cu > Co in the comparative study of Cu-TiO2, Co-TiO2, Au-TiO2 and Pd-TiO2. Optimum hydrogen evolution was achieved with 5 wt% Pd-TiO2 and 5 wt% Cu-TiO2.
关键词： Metal loading,UV light irradiation,Photocatalytic hydrogen production,Methanol,TiO2
更新于2025-09-09 09:28:46
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PPECu/NiFe2O4 as an efficient visible-light-driven difunctional photocatalyst for degradation of PPCPs and hydrogen production
摘要： A simple coprecipitation method has been used to prepare PPECu/NiFe2O4 composites. The as-prepared samples were studied by XRD, FE-SEM, TEM, EDS and UVevis Drs. The loading of NiFe2O4 not only enhanced the visible light absorption intensity of composites, but also promoted the separation of photogenerated electron-hole pairs. Cocatalyst NiFe2O4 made the PPECu/NiFe2O4 composites possessed better activities for TC degradation and hydrogen production than pure PPECu. Among the composite photocatalysts, P-NFO-5 exhibited the highest activity with the degrade ef?ciency of 98% (20 min) and hydrogen evolution yield of 35.8 mmol/g (3.0 h) under visible light irradiation. Furthermore, a possible mechanism for the ef?cient PPECu/NiFe2O4 composite has been discussed.
关键词： NiFe2O4,Photodegradation,PPECu,Photocatalytic hydrogen production,Difunctional photocatalyst
更新于2025-09-04 15:30:14