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Enhanced Visible Photocatalytic Activity of Tree-like ZnO/CuO Nanostructure on Cu Foam
摘要： Novel tree-like ZnO/CuO composite, composed of CuO nanowire trunks and ZnO nanorod branches, have been successfully synthesized on Cu foam substrate. Single-crystalline CuO nanowires and ZnO nanorods are obtained by thermal oxidation and hydrothermal processes, respectively. The morphological, crystal and optical properties of the as-prepared samples have been studied by field-emission scanning microscopy, X-ray diffractometer, transmission electron microscopy, and UV-vis spectrophotometer. The resultant tree-like ZnO/CuO composites on Cu foam show excellent photocatalytic activity with a rate constant of about 0.0073 min-1 in the photo-degradation of Rhodamine B (RhB) under visible light (λ>420 nm). The Cu foam not only provides extra-large surface area for the growth of tree-like CuO/ZnO composites, but also acts as an effective frame to support the catalysts. Furthermore, tree-like ZnO/CuO composite catalysts show high recovery yield for the recycling during the degradation of organic pollutants. This work provides an insight view into the design and synthesis of composite photocatalyst effectively supported by a substrate.
关键词： Cu foam,ZnO/CuO composite,self-supported photocatalyst,visible photocatalytic activity
更新于2025-09-10 09:29:36
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Cu2-xS loaded diatom nanocomposites as novel photocatalysts for efficient photocatalytic degradation of organic pollutants
摘要： Diatom frustules with hierarchical structures have been widely investigated in many fields due to their unique optical features, excellent mechanical resistance and extraordinarily intricate pore patterns. Herein, Cu2-xS modified diatomite has been successfully fabricated for the first time via a mild method at room temperature. The Cu2-xS nanoparticles with diameters of 50–100 nm were uniformly distributed on the diatomite. The as-prepared Cu2-xS-diatomite (Cu2-xS-DE) exhibits excellent photocatalytic degradation efficiencies for MB and MO, which reach to 99.1% and 96.9% respectively in 40 min under the irradiation of UV–vis light with 20 mg photocatalyst. The degradation mechanism of the organic pollutant over the Cu2-xS-DE/H2O2 reaction system was also proposed. This work provides an effective strategy to design and prepare of the diatom-based nanomaterials with efficient photocatalytic degradation activity, which is of great value for the environmental applications.
关键词： Diatom,Cu2-xS,Photocatalyst,Organic pollutant,Degradation
更新于2025-09-10 09:29:36
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Controllable synthesis of flower-root shaped Bi2O3/Bi2MoO6 heterostructures as an efficient photocatalyst under visible light irradiation
摘要： In this article, Bi2O3/Bi2MoO6 composites were synthesized hydrothermally under optimized conditions, by adjusting pH, the concentration of polyvinylpyrrolidone (PVP (K30)) and reaction time. During the synthesis process, flower-root shaped zero-gap Bi2O3/Bi2MoO6 heterojunctions were successfully synthesized. The adopted samples were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), Diffuse reflectance spectra (DRS), Photoluminescence (PL), and Fourier transform infrared spectroscopy (FT-IR). The photocatalytic activity was measured under visible-light-irradiation (λ > 420 nm) by degrading tetracycline (TC), ciprofloxacin (CPFX) (antibiotics) and rhodamine B (RhB), methylene blue (MB) (dangerous dyes). The degradation results indicated that photocatalyst sample synthesized at pH 9.0, PVP (K30) 0.05 mol/L and 80 min reaction time (Sup-Bi2O3/Bi2MoO6) demonstrated highly efficient performance. The Sup-Bi2O3/Bi2MoO6 showed the highest apparent rate constant (Kapp) that’s 50% more than the samples prepared at ordinary conditions. Photocatalytic degradation order was i.e. RhB> TC> CPFX> MB, which depends on the polarity of the degrading medium.
关键词： Bi2O3/Bi2MoO6,Flower-root shaped,Heterojunction,Visible light irradiation,Photocatalyst
更新于2025-09-10 09:29:36
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Fabrication of TiO2/CoMoO4/PANI nanocomposites with enhanced photocatalytic performances for removal of organic and inorganic pollutants under visible light
摘要： Ternary photocatalysts with superior visible-light photocatalytic performances, were fabricated for the first time through integration of CoMoO4 and polyaniline (PANI) with TiO2. These photocatalysts were studied by XRD, EDX, SEM, HRTEM, XPS, BET, PL, UV-vis DRS, and FT-IR. The ternary nanocomposites showed a significantly great efficiency for photocatalytic degradation of Rhodamine B (RhB), methyl orange (MO), methylene blue (MB) and fuchsine, as organic pollutants, and photoreduction of Cr(VI), as an inorganic pollutant, in the presence of visible-light illumination, when compared with TiO2 and TiO2/CoMoO4 samples. The photodegradation efficiency of RhB over the TiO2/CoMoO4/PANI (30%) photocatalyst was 21.7 and 4.9-folds as high as the pure TiO2 and TiO2/CoMoO4 (30%) nanocomposite, respectively. Moreover, the as-synthesized TiO2/CoMoO4/PANI (30%) nanocomposite exhibited considerable photocatalytic activity in reduction of Cr(VI), which is 13.8 and 4.9-folds as high as the TiO2 and TiO2/CoMoO4 (30%) samples, respectively. Pursuant to the results, ?O2? played critical role during the photocatalytic elimination of RhB. Furthermore, the ternary nanocomposite showed high photocatalytic stability. The present work provides a new approach to design ternary visible-light photocatalysts based on TiO2 with enhanced performances for water purifications.
关键词： TiO2/CoMoO4/PANI,TiO2/CoMoO4,Photocatalyst,Visible-light-induced
更新于2025-09-10 09:29:36
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Molecule-Driven Shape Control of Metal Co-Catalysts for Selective CO? Conversion Photocatalysis
摘要： In photocatalysis of CO2 conversion, metal co-catalysts draw photo-generated electrons from semiconductor components and act as reaction sites by adsorbing CO2 and its intermediates. Optimization of the metal co-catalyst structure is indispensable to improving the efficiency of the photocatalyst, which is currently not meeting performance requirements. By performing a series of experiments and simulations, we demonstrate the effect of selective particle shape control of metal co-catalysts (Au, Ag, Cu and Pt) by the CO2 induced gas ligands (CO2 and CO) on photocatalytic CO2 conversion activity and selectivity. Indeed, facet formation for adsorption of CO2 and CO proves to be an effective way to improve the CO2 conversion activity. In particular, proper interaction between the gas ligand and the metal co-catalyst surface, realized by strengthening the metal-CO2 adsorption and weakening the metal-CO adsorption, is identified as essential factor for increasing the CO2 conversion activity. Pt and Cu, which exhibit relatively strong interaction with gas molecules, have the improved photocatalytic CO2 conversion activity when grown under CO2. In contrast, Au and Ag, which exhibit relatively weak interaction with gas molecules, have the enhanced photocatalytic CO2 conversion activity when grown under CO. This systematic understanding can be a guideline for controlling the metal co-catalyst surface structure and will maximize the photocatalytic selectivity of the CO2 conversion.
关键词： CO2 reduction,Activity and selectivity,Transition metal co-catalyst,Facet control,Photocatalyst
更新于2025-09-10 09:29:36
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Boosted photocatalytic performance of uniform hetero-nanostructures of Bi2WO6/CdS and Bi2WO6/ZnS for aerobic selective alcohol oxidation
摘要： A two-dimensional hierarchical structural photocatalyst based on Bi2WO6 was obtained via a hydrothermal method and modified using ZnS and CdS and characterized by physico-chemical techniques XRD, FTIR, SEM, EDAX, and DRS. Their photocatalytic performance toward aerobic oxidation of primary alcohols was performed under incident visible light. In optimal condition, the photocatalytic conversion by modified Bi2WO6 was boosted from 25 to 68% in comparison to bare Bi2WO6 while in all cases the selectivities were as high as 99%. This such high photocatalytic activity was confirmed by PEC and photoluminescence (PL) spectroscopy studies which are related to the improvement of charge recombination and potential energy levels of photogenerated electrons-holes pairs. A plausible mechanism was suggested using a series of scavengers during photocatalytic oxidation reactions. Also, this heterogeneous photocatalyst was reused and recovered several times without loss photocatalytic activity. So, these series of catalysts were synthesized using the green and facial method in water solvent with significant advantages of high photocatalytic reactivity in presence O2 as oxidant upon incident visible light.
关键词： Mechanism,Nanocomposite,Photocatalyst conversion,Alcohol oxidation
更新于2025-09-10 09:29:36
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Facile construction of a molybdenum disulphide/zinc oxide nanosheet hybrid for an advanced photocatalyst
摘要： Zinc oxide, an important semiconductor material with good stability, is widely used in photocatalytic degradation of organic pollutants. MoS2 is a two-dimensional semiconductor material. When molybdenum disulphide has more sulfur elements exposed, the photocatalytic activity can be improved. Through the hydrothermal method, zinc oxide nanosheets and molybdenum disulphide nanosheets were successfully supported to form MoS2-ZnO heterojunctions. The surface area of these heterojunctions is large, and they expose more sulfur elements which can effectively promote the separation of photo-generated electrons and holes, and improve the photocatalytic performance of MoS2-ZnO heterojunctions. The photocatalytic degradation of Rhodamine B by MoS2-ZnO heterojunctions was completed in one hour. MoS2-ZnO heterojunctions are environmentally friendly photocatalysts that do not pollute the environment when they degrade organic pollutants in water.
关键词： Photocatalyst,Zinc oxide,Molybdenum disulphide,Heterojunction
更新于2025-09-09 09:28:46
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Decoration of SrTiO3 nanofibers by BiOI for photocatalytic methyl orange degradation under visible light irradiation
摘要： BiOI decorated electrospun SrTiO3 nanofibers (BE) with a spiky club structure were fabricated using a rapid microwave-assisted solvothermal method. The exposed (102) plane of BiOI preferentially coupled with the electrospun SrTiO3 fibers aiming to achieve charge neutrality. XRD analysis demonstrated that a BE composite coupled with an optimal content of BiOI exhibited few crystal imperfections. The resulting BE samples showed a higher degradation efficiency towards methyl orange dye under visible light irradiation (λ > 400 nm) compared to the individual BiOI and SrTiO3. The BE composite possessed a high degradation rate of 0.015 (kapp, min–1) and a normalized rate constant of 2.46 × 10–3 (kapp/surface area), which was 7.7 and 1120 times higher than those of BiOI and SrTiO3 alone, and a degradation level over 94.6% within 3 h of irradiation under visible light. The high photocatalytic activity could be attributed to the heterostructure formation, p-n junction at the BE interface, high contact between water and dye molecules with the BiOI covered surface, and extended visible light absorption. This work provides an effective approach to produce BE nanofibers for dealing with methyl orange dye and proves that BE composites have the potential to serve as visible-light-driven photocatalysts.
关键词： Visible light irradiation,Photocatalyst,SrTiO3,BiOI,Nanofiber
更新于2025-09-09 09:28:46
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Nanocrystalline ZnO doped lanthanide oxide: An efficient photocatalyst for the degradation of diesel pollutant in seawater under visible light irradiation
摘要： In this study, a ZnO doped Er2O3 photocatalyst is employed to degrade diesel pollutant in seawater under visible light irradiation. The photocatalyst was prepared by a precipitation method and was characterized by SEM and XRD analysis. The experimental results proved that the nanocrystalline photocatalysts were highly active in the visible region. The photocatalytic degradation efficiency of diesel was analysed by various experimental parameters namely dosage, doping ratio, initial concentration of diesel, pH value, concentration of H2O2 and illumination time. The degradation of diesel pollution in seawater was optimized by orthogonal experiment. According to the results, the removal rate of diesel is less than 30 % without any catalysts (only evaporation). The best effect exists when the dose of catalysts was 0.6 g/L, doping ratio of catalysts was 10%, initial concentration of diesel was 0.2 g/L, pH value was 8, concentration of H2O2 was 10 mg/L, illumination time was 1 h. The removal rate of diesel can reach 99.38 %. This study would make ZnO utilize sunlight more efficiently and accelerate the practical application of photocatalytic technology in organic pollutants treatment region.
关键词： visible light irradiation,photocatalyst,Er2O3,diesel pollutant,seawater,ZnO
更新于2025-09-09 09:28:46
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Preyssler-based nanocomposite as a magnetic photocatalyst: synthesis, characterisation and its photocatalytic activity for decolourisation of rhodamine B
摘要： In this work, the authors prepared a novel magnetic photocatalyst by grafting of Preyssler-type polyoxometalate, H14 [NaP5 W30 O110] onto Fe3O4 nanoparticles via an internal layer of silver nanoparticles. The obtained nanocomposite has been characterised by electron dispersive X-ray, transmission electron microscopy and scanning electron microscopy. The activity of the synthesised nanomagnetic photocatalyst was tested by the photocatalytic decolourisation of rhodamine B under UV light irradiation in the study’s designed reactor. It was found that, compared to pure Preyssler, decolourisation of rhodamine B was occurred four times faster using the synthesised magnetic nanocomposite with easy separation. The magnetic nanocatalyst was separated after ending the reaction and recycled. It just showed 2–3% decrease in catalytic activity after four recycling.
关键词： Preyssler-type polyoxometalate,Fe3O4 nanoparticles,photocatalytic decolourisation,rhodamine B,magnetic photocatalyst,silver nanoparticles
更新于2025-09-09 09:28:46