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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • charge – discharge energy efficiency
  • Lithium-ion battery
  • degradation diagnosis
  • photovoltaic surplus energy
  • working electric vehicle
应用领域
  • Electrical Engineering and Automation
机构单位
  • Ritsumeikan University
493 条数据
?? 中文（中国） ▾

  • Band Engineering of Ag-Bi12GeO20-Bi2WO6 Composite Photocatalyst: Interface Regulation and Enhanced Photocatalytic Performance

    摘要： Novel Ag-Bi12GeO20-Bi2WO6 heterojunction was developed and demonstrated as an excellent photocatalyst to degrade the Rhodamine B (RhB) aqueous solution with the help of UV-vis light. The Bi12GeO20-Bi2WO6 heterojunction was firstly fabricated through a facile partial chemical conversion strategy, employing pre-prepared Bi2WO6 nanosheets as Bi3+ source. Under the high temperature and high pressure environments, partially released Bi3+ ions derived from the Bi2WO6 nanosheets could react with Ge source, leading to the formation of Bi12GeO20 tetrahedrons. Meanwhile, the remaining Bi2WO6 nanosheets were also anchored in situ onto the surface of the Bi12GeO20 tetrahedrons, thus forming a unique heterojunction with “face-to-face” connection form of heterogeneous interface. After the loading of Ag nanoparticles, the as-obtained Ag-Bi12GeO20-Bi2WO6 heterogeneous structure exhibited outstanding catalytic efficiency toward the decomposition of RhB. Due to the structural and compositional features such as matching band structure, intimate interfacial contacts, unique interface contact structure and the well-known “schottky barriers", the photo-generated charges of the resulting ternary composite photocatalyst was efficiently separated and thus exhibited improved catalytic activity. This rational construction of Ag-Bi12GeO20-Bi2WO6 ternary photocatalytic system based on energy band engineering is ingenious and can provide a mirror for the fabrication of other photocatalytic materials.

    关键词： Degradation,Photocatalytic,Band Engineering,Semiconductor

    更新于2025-09-09 09:28:46

  • Zeolitic Imidazolate Framework 8-derived Au@ZnO for Efficient and Robust Photocatalytic Degradation of Tetracycline

    摘要： Tetracycline (TC) and other antibiotics accumulated in groundwater and soil pollutes ecological environment and threaten human health. Gold nanoparticles doped on photocatalysts are able to enhance the photodegradation efficiency during removing these antibiotics, but preparation of Au nanoparticles of well-dispersion on photocatalysts remains challenging. In this work, zeolite imidazolate (ZIF-8) was employed as the precursor to prepare Au@ZnO photocatalyst via impregnation and in-situ reduction method to efficiently degrade the tetracycline in the aqueous solution. Au nanoparticles are of 10 nm in size and uniformly dispersed on the surfaces of ZnO microstructures. The as-prepared Au@ZnO is able to remove 85.5% of TC of 0.010 mg/mL within two hours, of higher photocatalytic activity than pure ZnO catalyst. Most importantly, the catalyst shows its superior stability after five cycles without structure and activity changing. The mechanism of the photocatalytic degradation was discussed in detail.

    关键词： ZIF-8,Au@ZnO,degradation,tetracycline,photocatalytic

    更新于2025-09-09 09:28:46

  • Kinetics, mechanism, and identification of photodegradation products of phenazine-1-carboxylic acid

    摘要： Phenazine-1-carboxylic acid (PCA) is a broad-spectrum antibiotic against many plant pathogens, produced by Pseudomonas and other species. The biosynthesis and regulation of PCA has been well documented, but there is no report about its photochemical properties. Herein, the photodegradation of PCA was carried out in an aqueous solution under the irradiation of visible light to investigate the kinetics, mechanism, and identification of photodegradation products of PCA. Results revealed that photodegradation of PCA accorded well with first-order reaction kinetics. The measured half-life of PCA was 2.2 days at pH 5.0 and increased to 37.6 days at pH 6.8 when exposed to visible light. When oxygen was removed from its solution, the half-life of PCA was doubled. Different units of superoxide dismutase (SOD) enzyme (i.e. 0 units, 300 units, and 3000 units) and varying concentrations of sodium azide (i.e. 0 mg, 5 mg, 10 mg, and 20 mg) were used to decipher the mechanism for PCA photodegradation. Hydroxyl PCA and hydroxy phenazine were tentatively identified as the degradation products of PCA photodegradation process by high-performance liquid chromatography (HPLC). The obtained degradation products were further characterized and confirmed by HPLC-mass spectrometry and LC-MS/MS-based analytical approaches. In conclusion, the degradation of PCA was found to be light dependent, which could be accelerated by hydrogen ion and oxidant in the solution. The results suggest that PCA was more stable when stored in a neutral or alkaline environment or in the dark. Therefore, it is important to modify the PCA structure or use a suitable dosage for its broad-spectrum applications.

    关键词： First-order kinetics,Biological pesticide,Photodegradation,Phenazine-1-carboxylic acid,LC-MS,Degradation products

    更新于2025-09-09 09:28:46

  • Gallium Oxide || Ga2O3-photoassisted decomposition of insecticides

    摘要： Recent years have witnessed an ever increase in the production of many insecticides that contain fluorine and/or trifluoromethyl groups [1]. These fluorinated chemicals have excellent physicochemical characteristics such as, adsorption, hydrophobicity, thermal chemical stability, and bioactivity [2]. Accordingly, they have attracted intense investigations and have been applied in various fields [3]. Reports have appeared regarding contamination of common insecticides, health risks, and pollutant-treatment systems. However, scant research is being carried out on the decomposition of fluorinated substances. The perfluorinated chemicals such as perfluorooctanoic acid (PFOA) and the perfluorooctanesulfonate (PFOS) surfactant were produced by DuPont in the United States in 1947. Seven decades have elapsed since their developments [4]. PFOA and PFOS have also been used in firefighting water sprays in great amounts resulting in the worldwide contamination of aquatic environments. Because the quantities used were low in the beginning, people failed to recognize the potential hazards of these perfluorinated chemicals. Yet recently the production has increased considerably with its inevitable serious ecological and environmental results caused by the use of these fluorinated chemicals.

    关键词： photocatalytic degradation,wastewater treatment,fluorinated chemicals,Ga2O3,insecticides

    更新于2025-09-09 09:28:46

  • Oxygen Vacancy-Rich Ultrathin Sulfur-Doped Bismuth Oxybromide Nanosheet as a Highly Efficient Visible-Light Responsive Photocatalyst for Environmental Remediation

    摘要： Designing ultrathin two-dimensional (2D) defective materials and metal-free doped materials as photocatalysts both have received enormous attentions in the field of environmental remediation due to their great potential for removing colorless contaminants. However, whether the synergism of defects and metal-free doping exists and the corresponding oxidative mechanism is unclear, which retard further developments of high performance catalysts. Here, a novel oxygen vacancy (OV)-rich ultrathin sulfur-doped BiOBr nanosheet (BB-xS) was synthesized through a facile one-step solvothermal method. Under visible light irradiation, the optimal BB-5S sample exhibited 98% degradation efficiency of 4-chlorophenol (4-CP) within 120min, which was 4.9 and 18.0 times greater than that of pristine ultrathin BiOBr and oxygen vacancy-poor sulfur-doped BiOBr, respectively. Also, this excellent photoactivity could extend to other colorless organic contaminants, such as bisphenol analogues and sulfonamides, verifying the universal applicability of BB-xS. Based on experimental results and density functional theory (DFT) calculations, it was manifested that a sub-band was generated via the synergistic effect of oxygen vacancies and sulfur doping, and it greatly enhanced the visible-light absorption capability and suppressed the photoinduced charge recombination, which would be beneficial to improve the photocatalytic activity. Additionally, the corresponding photocatalytic degradation pathway of 4-CP was also proposed. This work can provide a new protocol for the design and construction of highly active photocatalysts toward environmental remediation.

    关键词： photocatalytic degradation,Ultrathin two-dimensional nanosheets,sulfur-doped,oxygen vacancy,colorless organic contaminants

    更新于2025-09-09 09:28:46

  • Degradation of Rhodamine B Under Visible-Light by Cu-Doped ZnAl Layered Double Hydroxide

    摘要： The Cu-doped ZnAl layered double hydroxides (LDH) were papered by coprecipitation. The prepared samples were characterized by mutiple techniques including X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse-re?ectance spectroscopy (UV-vis DRS). The doping of Cu2+ into the LDH sheets results in formation of the distorted CuO6 octahedrons which contribute for the excitation of electrons under visible light. The doped Cu2+ also serves as photo-generated charges separator and improves the visible-light-driven photocatalytic activity of ZnAl LDH. A degradation mechanism based on the hydroxyl radical as the active species was proposed.

    关键词： RhB Degradation,Visible Light,Copper-Doping,Layered Double Hydroxides

    更新于2025-09-09 09:28:46

  • Facile Synthesis, Characterization and Enhanced Photocatalytic Activities of NiWO <sub/>4</sub> /Nitrogen Doped Reduced Graphene Oxide Nanocomposites

    摘要： In this study, we report the synthesis of NiWO4/nitrogen doped reduced graphene oxide nano composite by one-pot hydrothermal method. The NiWO4 nano particles were dispersed uniformly on graphene sheets. The as prepared NiWO4, NiWO4/5% rGO and NiWO4/N-5% rGO composites were analytically characterized by Powder X-ray diffraction (XRD), Raman spectroscopy, Diffuse re?ectance spectroscopy (DRS-UV), Scanning electron microscopy (SEM) and N2 adsorption–desorption isotherm. The photocatalytic performances of the synthesized composites were evaluated towards the photo degradation of congo red (CR) under visible light radiation. The synthesized catalysts showed remarkable photocatalytic activity in the degradation of CR. Among the catalysts NiWO4/N-5% rGO showed the highest decolourization of congo red (92%) under visible light irradiation. This high activity is attributed to its high e? transport property. Our results provide an invaluable methodology for designing high-performance photo-catalysts for new energy applications.

    关键词： Wolframite,Nickel Tungstate,Degradation,Graphene,Congo Red

    更新于2025-09-09 09:28:46

  • T?ng h?p v?t li?u CeO2 kích th??c nanomet trên n?n SiO2 và nghiên c?u kh? n?ng quang xúc tác c?a chúng

    摘要： The nanomaterials CeO2 with average size of 50 nm on the SiO2 base which performed very high photocatalytic properties were successfully synthesized by the sol-gel combustion method. Starting with freshly precursor, the prepared sample was studied the morphology and characterized by X-ray diffraction, field-emission scanning electron microscopy and Brunauer-Emmetl-Teller method at 77 K. The nanocomposite material contained only 10 % and 20 % of CeO2, but it still presented a significant efficiency on methyl orange degradation under visible light. The CeSi20 which includes 20 % of CeO2 nanoparticles revealed that the photocatalytic capacity with over 97 % of methyl orange was removed after 60 min of the irradiation.

    关键词： CeO2,Nanomaterials,photocatalytic,methyl orange degradation

    更新于2025-09-09 09:28:46

  • Synthesis of Self-Gravity Settling Faceted-Anatase TiO2 with Dominant {010} Facets for the Photocatalytic Degradation of Acetaminophen and Study of the Type of Generated Oxygen Vacancy in Faceted-TiO2

    摘要： In this study, faceted TiO2, predominately exposed with {010} facets (T-{010}), was synthesized with a two-step hydrothermal reaction and used for the degradation of acetaminophen (ACE) in an aqueous solution. T-{010} showed considerable photocatalytic reactivity, and its easy-settling (gravity-settling, ~97% of T-{010} settled after 30 min) property demonstrated acceptable reusability. A solid-state chemical reduction approach (NaBH4) at a mild temperature (300 ?C) was used for generation of an oxygen vacancy in T-{010} and P25 (commercial TiO2). The oxygen vacancy concentrations of the samples were investigated by electron paramagnetic resonance (EPR). It was also found that NaBH4 reduction induced the generation of both surface and subsurface Ti3+ on colored P25, but only surface Ti3+ species were formed on colored T-{010}. The prepared colored TiO2 samples were successfully used for photocatalytic degradation of ACE in an aqueous solution under visible light illumination.

    关键词： photocatalytic degradation,visible light,{010} facet,oxygen vacancy,settling

    更新于2025-09-09 09:28:46

  • Hydrophilicity and Water Contact Angle on Methylammonium Lead Iodide

    摘要： Surface properties are often assessed with measurements of the contact angle of a water drop. The process is however flawed for the very important class of hybrid perovskite materials, extensively employed in solar cells and optoelectronics research, because they are water soluble and their surface degrades during contact angle measurements. While hybrid perovskites are considered to be highly hydrophilic, a contact angle with water of 83° can be measured, as if they were almost hydrophobic. By combining experiments and simulations, the actual value is explained as the result of the interaction of water with degraded superficial layers that form over sub-millisecond time scale at the water/perovskite interface. The models are validated against contact angle measurements for water on a variety of substrates, and are referenced to with the Young–Dupré relation between liquid–solid adhesion and contact angle. Present work reconciles the hydrophilic nature of methylammonium lead iodide with the apparent hydrophobic behavior in contact angle measurements, proposing a methodology for the study of contact angle on evolving substrates.

    关键词： hybrid perovskites,atomistic simulations,degradation,molecular dynamics,PbI2

    更新于2025-09-09 09:28:46