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The preparation of spherical mesoporous g-C3N4 with highly improved photocatalytic performance for H2 production and rhodamine B degradation
摘要： Spherical mesoporous graphitic carbon nitride (g-C3N4) was successfully prepared through spherical mesoporous silica as sacrificial templates, and analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analyzer, N2 adsorption-desorption isotherm, BET, UV-vis diffuse reflectance spectra and photoluminescence spectra. Experimental results indicated that as-prepared g-C3N4 exhibited spherical morphology with high surface area due to the introduced porous structure, which made the as-prepared g-C3N4 possess much higher activity than the bulk g-C3N4 for producing H2 and decomposing rhodamine B (RhB) under visible light, and it also kept excellent recycling activity. Hence, this investigation provided a simple strategy for the fabrication of porous special morphology graphitic carbon nitride with excellent photocatalytic activity.
关键词： Visible light,spherical mesoporous g-C3N4,Photocatalyst,Photocatalytic activity
更新于2025-09-19 17:15:36
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Enhanced UV-Vis-NIR activated photocatalytic activity from Fe <sup>3+</sup> -doped BiOBr:Yb <sup>3+</sup> /Er <sup>3+</sup> upconversion nanoplates: synergistic effect and mechanism insight
摘要： Upconversion (UC) materials are recognized as promising candidates to harvest solar energy for photocatalysis. In this work, a simple strategy for simultaneously enhancing the UC luminescence and photocatalytic efficiency of BiOBr:Yb3+/Er3+ nanoplates through Fe3+ ion doping is reported. Compared to the Fe3+-free sample, the UC emission intensity was significantly enhanced through tailoring of the crystal symmetry by Fe3+ ions. Experiment and DFT calculations reveal that the introduction of Fe3+ ions resulted in the formation of an impurity energy level, extending to the light absorption region. As expected, the Fe3+-doped BiOBr:Yb3+/Er3+ nanoplates exhibit a wide photoresponse from the UV to NIR regions, good stability, and obviously enhanced photocatalytic activities compared with the BiOBr:Yb3+/Er3+ nanoplates in the degradation of RhB. The boosted photocatalytic activity can be attributed to the synergic effect of the efficient utilization of UC luminescence and Fe3+ doping, where Fe3+ doping could improve the light harvesting capacity, enhance the separation efficiency of electron and hole (e?/h+) pairs, and promote the production of highly oxidative species. This work not only provides a promising system for the efficient utilization of solar light, but also offers a feasible guideline for the further design of broad-spectrum active photocatalysts.
关键词： Enhanced UV-Vis-NIR activated photocatalytic activity,mechanism insight,Fe3+-doped BiOBr:Yb3+/Er3+ upconversion nanoplates,synergistic effect
更新于2025-09-19 17:15:36
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Facile synthesis of molybdenum multisulfide composite nanorod arrays from single-source precursor for photoelectrochemical hydrogen generation
摘要： The deposition of molybdenum multisulfide thin-film photoanodes from the metal–organic precursor [CpMo(SMe)2]2 (1), at different deposition time has been investigated. Four different films were deposited at 550 °C under constant argon gas flow for 10, 15, 20, and 25 min, respectively. The surface morphology of these films analyzed with FE-SEM and AFM showed the presence of compact 1D rod-like structure of MoS2/Mo2S3 in a homogeneous form. The average diameter of the 1D compact MoS2/Mo2S3 composite nanorod arrays was found in the range of 155–298 nm deposited for different time durations. EDX analysis showed a consistency where the Mo-to-S ratio was approximately 3:4.5 and demonstrated the overall composition of the 1D MoS2/Mo2S3 composite nanorod arrays. The XRD analysis of the thin film indicated the presence of monoclinic Mo2S3 and rhombohedral MoS2 composite system. Moreover, the photocurrent density of 20 min deposited thin film is observed to be 4 mA/cm2 with highest photosensitivity of 6.78 at the overpotential of 0.3 V vs Ag/AgCl under the simulated light intensity of 100 mW/cm2 (AM 1.5G). The electrochemical impedance spectroscopy (EIS) also showed improved charge transportation with highest lifetime of the photoexcited charges in 20 min deposited thin film in comparison to the other deposition time durations. This study provides the optimized synthesis conditions for producing molybdenum-based multisulfide nanostructures and the deposition duration for their deployment in solar-based devices.
关键词： Visible light photocatalytic activity,Single-source precursor,Thin films,MoS2/Mo2S3 composite
更新于2025-09-19 17:15:36
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Enhanced photocatalytic activity of potassium-doped titania photocatalyst films with nanosheet structure
摘要： Potassium-doped titania (K-doped TiO2) films had been prepared by molten-salt treatment in KNO3 for Ti-TiC coatings, containing different amount of TiC, in order to achieve enhanced activity of the films. When the amount of TiC is lower than 40%, the partial surface morphology of K-doped TiO2 films clearly shows a nanosheet structure, and the formed nanosheets could increase the accessible surface area. The results show that K-doped TiO2 with composite crystals has formed with different amount of TiC, and the relative Raman peak intensity of Ti-O-K bonding is highest for 40% TiC. Even avoiding high adsorption of K-doped TiO2 films, the films exhibit excellent and stable photocatalytic activity. With increasing the amount of TiC, the photocatalytic activity of K-doped TiO2 films first increases then decreases, reaching the highest for 40% TiC.
关键词： nanosheet,K-doped TiO2,photocatalytic activity,photocatalyst films,molten salt of KNO3
更新于2025-09-19 17:15:36
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Rectifying Behaviour and Photocatalytic Activity in ZnO Nanorods Array/Ag/CuSe Heterostructure
摘要： Ag incorporated vertically aligned ZnO nanorods array/CuSe thin film (ZnO NRs/CuSe TF) have been fabricated via a solution route, thermal evaporation and magnetron sputtering process. Ternary ZnO nanorods/Ag/CuSe heterostructure was studied by X-ray diffractometry, field emission-scanning electron microscopy/energy dispersive X ray spectroscopy, current–voltage measurement and a UV–Vis–near IR spectrophotometer. The photocatalytic performance was estimated by the degradation of Rhodamine B solution under UV–Vis light irradiation. The photocatalytic efficiency of the ZnO NRs/Ag/CuSe heterostructure is higher than that of ZnO NRs/Ag and ZnO NRs/CuSe counterparts due to the robust effects of the three functional components coupling. The localized surface plasmon resonance and two Schottky junctions (e.g. Ag/ZnO and Ag/CuSe) motivates photogenerated electron–hole separation and transfer. This work presents an artificial manipulated system to enhance light harvesting, efficient charge separation and transfer, and low recombination rate in solar energy conversion.
关键词： Photocatalytic activity,Localized surface plasmon resonance (LSPR),Charge separation,ZnO nanorods array/Ag/CuSe heterostructure
更新于2025-09-19 17:15:36
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Sustainable Scientific Advancements modified Ag2O-ZnO thin films characterization and application of photocatalytic purification of carcinogenic dye in deionizer water and contaminated sea water solutions and Synthetic, Natural based Dye-Sensitized Solar Cells
摘要： The manuscript studied the preparation of ZnO as well as Ag2O-ZnO thin films deposited on glass substrates by spray pyrolysis approach at 500oC. The photocatalytic activity of Ag2O-ZnO nanocomposite material was studied via the Photodegradation reaction of Rhodamine B (Rh B) dye under UV-light irradiation in Deionizer water which shows high activity as compared by Contamination of sea water. The Zinc was Zincacetylacetonate (Zn C10 H14 O5) at the atomic concentration and then dissolved in the ethanol and Ag NO3 (0.1 M) dissolved in ethanol. The effect of silver Oxide - Zinc Oxide Nanocomposite material on the structural, surface morphological, electrical and optical properties of Ag2O-ZnO thin films were studied. HR-SEM and HR-TEM image shows exposed that the surface morphology of the films nanoflower shaped structure. The presence of Silver, Zinc and Oxygen are confirmed the presence of peaks, using EDS analysis. X-ray diffraction (XRD) patterns accepted the successful growth of high quality thin films which is polycrystalline nature. The PL analysis shows in Ag2O-ZnO is certified to the low recombination of electron-hole pairs by transfer of electrons and holes between ZnO and UV-Vis DRS analysis. The photocatalytic activity of Ag2O-ZnO nanocomposite material was studied from Photodegradation study of Rhodamine B (Rh B) dye under UV-light irradiation of Deionizer water was high activity that Contamination of sea water. As a reaction of this the material was found to be stable and reusable, which extends to a high antibacterial activity and the electrochemical study from synthetic based and Natural based DSSCS analysis showed increased current is short circuit by Ag2O-ZnO thin film nanocomposite material was industrial applications.
关键词： Spray pyrolysis,Photocatalytic activity,Electrochemical activity,Antibacterial activity
更新于2025-09-16 10:30:52
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Lignite-derived carbon quantum dot/TiO <sub/>2</sub> heterostructure nanocomposites: photoinduced charge transfer properties and enhanced visible light photocatalytic activity
摘要： Here, we present a facile and green route to cleanly and efficiently utilize low-rank lignite to produce in high yields and in situ synthesize CQDs/TiO2 heterostructure nanocomposites. Unlike other CQDs, the lignite-derived CQDs exhibit obvious concentration-dependent red-shifted absorption, unusual aggregation-induced different color emissions and strong orange-red solid-state fluorescence. Through the optimization of the CQD loading proportion, the 2 wt% CQDs/TiO2 shows the optimal photocatalytic performance under visible light. We highlight the CQDs/TiO2 heterostructure nanocomposites by focusing on their dynamic photoinduced charge transfer properties triggered by the heterostructure interface and their application as a photocatalyst under visible light. Our detailed work about the transfer behavior of photoinduced charges in coal-derived carbon quantum dot/TiO2 heterostructure nanocomposites may shed light on the intrinsic reasons for CQD/semiconductor enhanced photocatalytic activity.
关键词： photoinduced charge transfer,heterostructure nanocomposites,visible light photocatalytic activity,lignite-derived carbon quantum dots,TiO2
更新于2025-09-16 10:30:52
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Alcohol-Induced Synthesis of Photocatalytic TiO2 with Controlled Hierarchical Structure
摘要： Three-dimensional (3D) hierarchical TiO2 structures were obtained by a facile solvothermal process. Various analytical techniques were used to characterize the crystal phase, morphology and optical absorption of the obtained samples. The experimental results indicate that the morphology could be tailored by adjusting the volume ratio of glycerol to ethanol. The investigation of photocatalytic performance shows that all the as-prepared TiO2 samples possess an excellent photocatalytic activity superior to commercial P25 in the degradation of Rhodamine B (RhB) dye under UV-light irradiation. In addition, the optimized volume ratio of ethanol to glycerol is 20 : 15. The possible mechanism related to the photocatalytic activity of the sample is discussed in detail. The enhanced photocatalytic activities of TiO2 samples could result from their hierarchical structures assembled by 1D nanorods and large light-harvesting efficiency.
关键词： solvothermal process,photocatalytic activity,hierarchical,TiO2
更新于2025-09-16 10:30:52
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Spinel oxide ZnCr2O4 incorporated with ZnS quantum dots for application on visible light driven photocatalyst Azo dye degradation
摘要： Azo dyes, a kind of synthetic dye stuff, have a wide range of applications in textile, leather, food and printing industries, but it causes adverse health effects to human beings and to the ecosystem. Herein, we report the photocatalytic degradation of methyl orange dye, by using ZnS/ZnCr2O4 nanohybrid sample. The samples were prepared by simple precipitation process and characterized in order to investigate its crystallinity, morphology, functional group, photophysical properties, elemental composition and mapping. The amino acid capped ZnS/ZnCr2O4 nanohybrid show enhanced photocatalytic properties in the photodegradation of azo dye, compared to that of bare ZnS QDs and ZnCr2O4 nanoparticles. The nanohybrid remain unaffected after four cycles of azo dye degradation. The enhanced performance might be due to the formation of interface between ZnS QDs and ZnCr2O4 nanoparticles. The methionine capped ZnS/ZnCr2O4 nanohybrid provide a new hope to develop an efficient and commercializable photocatalyst with improved efficiency.
关键词： Azo dye,Quantum dots,Photocatalytic activity,Spinel oxide
更新于2025-09-16 10:30:52
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Consequence of hot electron of Au and PbS shell thickness on photoa??electrochemical and catalytic activity of ZnO@Au@PbS nanorods for decomposition of toxic organic chemicals and Cr(VI) reduction by UV-to-near-infrared photon harvesting
摘要： In this research work, we have synthesised ZnO@Au@PbS nanorods (NRs) with different shell thickness by a facile chemical method. On introduction of Au nanoparticles (NPs) and PbS shells, the defect emission of ZnO NRs quench and the charge separation process enriches. Under simulated solar light irradiance the photoconductivity and charge transfer efficiency also escalate with Au NPs and PbS shell along with enhancing photocatalytic degradation of organic contaminant. The excitation wavelength dependent catalytic activity confirmed the significant enrichment in photocatalytic activity owing to the synergistic influence of Au NPs and PbS coating on ZnO NRs. The effect of aqueous solution pH and PbS shell thickness on photocatalytic reduction of Cr (VI) has been also explored. The possible charge transfer mechanism during the photocatalytic activity of ZnO@Au@PbS NRs is also proposed and analysed. The catalytic activity, stability and recyclability results revealed that ZnO@Au@PbS NRs are highly favourable and reusable for the environmental remedies.
关键词： UV-to-near-infrared photon harvesting,photocatalytic activity,Cr(VI) reduction,ZnO@Au@PbS nanorods,charge transfer
更新于2025-09-16 10:30:52