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Nanocrystal-engineered thin CuO film photocatalyst for visible-light-driven photocatalytic degradation of organic pollutant in aqueous solution
摘要： We design a thin CuO film photocatalyst for visible-light-driven photocatalytic degradation of methylene blue (MB). Nanocrystal engineering of the photocatalyst is performed by sputtering with concurrent in-situ thermal treatment. The impacts of the in-situ thermal treatment temperature and sputtering conditions on the material properties of the thin CuO film photocatalyst are investigated in detail. Systematic characterization using field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) indicates that deposition at elevated temperature and higher sputtering power significantly improves the surface structure and crystallinity of thin CuO film, which promotes charge transfer and ultimately results in better performance for MB photocatalytic degradation. The best-performing sample is the one sputtered at an elevated temperature of 300 °C and a sputtering power of 300 W. The photodegradation efficiency and physical durability of the samples were also analyzed after using for 5 cycles. The results indicate that in-situ thermal treatment and nanocrystal engineering of the thin CuO film significantly improve the physical durability.
关键词： Thin CuO film photocatalyst,Visible-light-driven photocatalytic degradation,Nanocrystal engineering
更新于2025-09-23 15:23:52
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Activated carbon/metal-organic framework nanocomposite: Preparation and photocatalytic dye degradation mathematical modeling from wastewater by least squares support vector machine
摘要： Herein, Kiwi peel activated carbon (AC), Materials Institute Lavoisier (MIL-88B (Fe), and AC/MIL-88B (Fe) composite were synthesized and used as catalysts to degrade Reactive Red 198. The material properties were analyzed by the FTIR, BET-BJH, XRD, FESEM, EDX, TGA, and UV–Vis/DRS. The BET surface area of AC, MIL-88B (Fe) and AC/MIL-88B (Fe) was 1113.3, 150.7, and 199.4 m2/g, respectively. The band gap values (Eg) estimated by Tauc plot method, were obtained 5.06, 4.19 and 3.79 eV for AC, MIL-88B (Fe) and AC/MIL-88B (Fe), respectively. The results indicated that the AC/MIL-88B (Fe) composite had higher photocatalytic activity (99%) than that of pure AC (79%) and MIL-88B (Fe) catalysts (87%). The decolorization kinetic was matched well with the second-order model. Moreover, the data were modeled using least squares support vector machine which optimized with Cuckoo optimization algorithm. The optimal parameters were found 0.837 and 3.49e+02 based on σ2 and γ values, respectively. The mean square error (MSE) and correlation coefficient (R2) values were obtained 3.97 and 0.948. Therefore, the attained data, materials characterization and prediction of modeling validate the composite form of MIL-88B(Fe) with new AC, had better photocatalytic activity in comparison with the individual form.
关键词： Metal-organic frameworks (MOFs),Synthesis,AC/MIL-88B (Fe) composite,COA-LSSVM modeling,Photocatalytic degradation
更新于2025-09-23 15:23:52
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Enhanced sunlight photocatalytic performance of ZnO/ZnS binary heterostructure sheets
摘要： The 2D binary heterostructured ZnO/ZnS sheets were prepared via a hydro-thermal synthesis method. The X-ray diffraction results illustrated that ZnS was successfully formed on ZnO sheets. The images captured by field emission scanning electron microscopy showed the granular structure with fine particles on the surface, which increases the contact area between dye solution and catalysts. The EDS spectrum suggested that the surface of the heterojunction was almost entirely coated with ZnS. The UV-vis diffuse reflectance spectra clarified that the ultraviolet and visible absorption of heterostructure were both enhanced. These results all contribute to the efficient methyl orange degradation with the degradation rate of 83 % in 4 h under direct sunlight.
关键词： Binary heterostructure,Sunglight,Photocatalytic activity,Semiconductor
更新于2025-09-23 15:23:52
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Fabrication and enhanced photocatalytic property of TiO2-ZnO composite photocatalysts
摘要： TiO2 nanotube and TiO2-ZnO composite photocatalysts were fabricated by simple hydrothermal method, and the photocatalytic property of as-prepared samples were analyzed by the photo degradation of rhodamine B water solutions under visible light irradiation. The prepared TiO2-ZnO composite photocatalysts exhibited excellent property in photo degradation of rhodamine B water solution, which is better than that of P25. The enhancement photocatalytic property of target photocatalysts could be attributed to the reduced band gap energy, the enhanced-surface physic-chemical properties, the separation of photo induced electron-hole pairs and the decreased recombination rate. In addition, TiO2-ZnO composite photocatalysts showed good stability for rhodamine B photo degradation under visible light.
关键词： Microstructure,TiO2-ZnO,Photocatalytic property,Hydrothermal method,Composite materials
更新于2025-09-23 15:23:52
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AIP Conference Proceedings [Author(s) PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017) - Bali, Indonesia (26–27 July 2017)] - Novel Ag2O/ZrO2 composites with enhanced photocatalytic water decontamination
摘要： In this study Silver Oxide/Zirconium Dioxide (Ag2O/ZrO2) with different Ag2O:ZrO2 weight ratio were synthesized using microwave assisted method for remove organic pollutant from the aqueous solution through photocatalytic performance. The structural properties of the samples characterized by X-ray diffraction confirm the existence of cubic structures from silver (Ag) nanoparticles, cubic structure silver oxide (Ag2O), and tetragonal structures from Zirconia (ZrO2). The higher ZrO2 loading resulted in the higher Ag nanoparticles on the samples. The thermal analysis was investigated using Differential Thermal Analysis and Thermogravimetric Analysis (DTA/TGA). The weight lost at 400 °C could be attributed to the phase transformation from Ag2O into Silver nanoparticles followed by accepted heat from the environment. The UV vis absorbance spectra confirm the existence of surface plasmon resonance from silver nanoparticles. The photocatalytic activity was tested on the degradation of methylene blue from the aqueous solution. As can be seen from the figure that the higher ZrO2 loading resulted in the higher photocatalytic activity under visible light irradiation with percentage degradation approximately 83 % The enhancement of photocatalytic performance due to the retarding recombination electron and holes.
关键词： ZrO2,Ag2O,photocatalytic
更新于2025-09-23 15:23:52
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Synthesis and photocatalytic properties of biomimetic morphology silicon carbide
摘要： Silicon carbide materials with bionic morphology are prepared by impregnation-calcination method using the template of leaf vein. The microstructure, element composition, and band gap of biomimetic morphology silicon carbide are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy(XPS). Photocatalytic property of biomimetic morphology silicon carbide has been measured by the dye decolorization reaction. The results demonstrate that calcination temperature has the important effect on the formation of silicon carbide. The morphology of silicon carbide can keep the original biomimetic shape of leaf vein template, and there is meosporous structure with a diameter of 2-4 nm on the interior of material. The average gain size of materials is about 16.9 nm and the specific surface area of materials is about 84.7 m2/g. After calculation, the band gap of material is 3.02 eV. For performance testing, the degradation rate of silicon carbide is 92.86% for the first time, and after the fourth repetition, the degradation rate decreased to 86.74%.
关键词： Biological Template,Silicon Carbide,Biomimetic Morphology,Photocatalytic Property
更新于2025-09-23 15:23:52
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Facile synthesis of N/B double-doped Mn <sub/>2</sub> O <sub/>3</sub> and WO <sub/>3</sub> nanoparticles for dye degradation under visible light
摘要： In the present work, Nitrogen-doped and Nitrogen-Boron double doped manganese oxide (Mn2O3) and tungsten oxide (WO3) nanoparticles were synthesized using precipitation-hydrothermal method for methylene blue degradation under visible light. Materials were characterized using X-ray diffraction (XRD) analysis, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and UV-Vis spectroscopy. Results showed that N and B were successfully incorporated into the crystal lattices of Mn2O3 and WO3. XRD showed that WO3 was crystallized in the form of a monoclinic lattice, while cubic Mn2O3 was produced in the cubic form. The crystallite size was found to be decreased due to the substitution of N and B elements which reveals their roles to accelerate the crystal nucleation rate resulting in the decreased size. On the other hand, single and double doping has successfully narrowed the bandgaps of the as-synthesised metal oxide photocatalysts resulting in better absorption in the visible light. Bandgaps obtained were as follows: 3.02, 2.50, 1.73 and 1.77 eV for N-WO3 N/B-WO3, N-Mn2O3 and N/B-Mn2O3 respectively. Photocatalytic experiments showed that all as-synthesised materials exhibited a photocatalytic efficiency under visible light ≥420 nm. The degradation efficiency of MB was in the following order: N-B-co-doped metal oxides > N-doped metal oxides > metal oxides. The presence of scavenger molecules such as isopropanol (IPA), EDTA-2Na and benzoquinone inhibited MB degradation. Finally, the results showed that these materials can be reused several times without a notable decrease in efficiency.
关键词： Photocatalytic degradation,Visible light,Double-doping,Metal oxides
更新于2025-09-23 15:23:52
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Preparation and photocatalytic performance of Cu-doped CeO <sub/>2</sub> by citrate combustion method
摘要： Cu-doped cerium oxides were successfully prepared by nitrate combustion method. The crysatlline phase evolution, micro morphology and photocatalytic performance of the products are systematically studied by XRD, SEM/EDX and degradation rate of methylene blue. The results show that at relative low temperature (<600°C), 20 mol% copper can be dissolved into CeO2 fluorite type cubic structure, however, at high temperature of 700°C, CuO phase desolution from CeO2 solid solution is detected by XRD, and confirmed by DTA for 5% Cu-doped sample. The as prepared photocatalysts show agglomeration of ultra fine particles with porous structure. Degradation results of methylene blue indicate that better photocatalytic performance is obtained for 5% Cu-doped CeO2 under the stimulated visible light than UV light irradiation (both 254 nm and 365 nm), even the power of former is half of the later. The loss of photocatalytic activity for higher doping samples (>5% Cu) is believed to be the serious agglomeration of the particles and desolution of CuO from CeO2 solid solution.
关键词： doping,citrate combustion method,copper,photocatalytic,Ceria
更新于2025-09-23 15:23:52
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Highly enhanced photocatalytic H2 evolution of Cu2O microcube by coupling with TiO2 nanoparticles
摘要： The improvement of photocatalytic performance could be attributed to the formation of p-n heterojunction. Furthermore, the interface effect of Cu2O and TiO2 caused a broader absorbance in visible light region and the lower recombination of photogenerated electron-hole pairs. It is believed that the Cu2O/TiO2 p-n heterojunction composites could provide an alternative method to design highly efficient photocatalysts for solar energy. The yield remained around 92.6% after three cycles. Hydrogen production of the Cu2O/TiO2 (60 wt. %, labeled as CT-60) exhibits the highest enhanced photocatalytic activities in hydrogen production with H2 evolution 3002.5 μmol/g. CT-60 is 103 and 8.5 fold higher than cubic Cu2O and TiO2 nanoparticles, respectively. The photocatalytic performance of the composite was effectively tuned by controlling the amount of TiO2. A Cu2O/TiO2 p-n heterojunctions composite was created via a facile, controllable, and one-pot hydrothermal method based on cubic Cu2O and TiO2 nanoparticles in the presence of dioctyl sulfosuccinate sodium salt (AOT) surfactant. The TiO2 nanoparticles with average edge length of ~10.1 nm were uniformly distributed on the crystal surface of Cu2O cube {100}.
关键词： superior stability,high hydrogen yield,Cu2O/TiO2,photocatalytic
更新于2025-09-23 15:23:52
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Photocatalytic and antibacterial activities of <i>Paeonia emodi</i> mediated silver oxide nanoparticles
摘要： Green synthesis of nanomaterials and its verity of applications have linked chemistry, biotechnology and environmental chemistry. Green process get more attention due to its easy handling and inertness to ecosystem. The selection of green synthesis and silver oxide nanoparticles (Ag2O NPs) are purely based on its nontoxic behavior and promising activates. Eco-friendly process was applied for the synthesis of silver oxide nanoparticles (Ag2O NPs) using Paeonia emodi (P. emodi) fresh leaves extract as reducing agent. The average crystallite size was found to be 38.29 nm, calculated from the FWHM of the diffraction bands of X-rays diffractometer (XRD). The morphological study was made by performing transmission electron microscopy (TEM) and scanning electron microscope (SEM) and the particles size estimated from the micrographs of both techniques are 38.29 and 86.4 nm respectively. The energy dispersive X-ray (EDX) was used to study the purity and percent composition of the Ag2O NPs. The band gap energy (4.02 eV) and surface functional groups was studied by diffuse reflectance spectroscopy (DRS) and fourier transform infrared spectroscopy (FTIR) respectively. The 97.78% methylene blue (MB) was degraded in the presence of Ag2O NPs and UV-Visible light source in 180 min. The antibacterial activity of the Ag2O NPs were tested against Gram-positive (Bacillus subtilis (B. subtilis) and Staphylococcus aureus (S. aureus)) and Gram-negative (Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa) bacteria. It was found that the Ag2O NPs have strong growth inhibiting activity against Gram-negative bacteria than Gram-positive bacteria.
关键词： Photocatalytic degradation,Methylene blue,Eco-friendly,Antibacterial Activity,Silver oxide,Leaves extract
更新于2025-09-23 15:23:52