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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） ▾

  • Tuning in BiVO4/Bi4V2O10 porous heterophase nanospheres for synergistic photocatalytic degradation of organic pollutants

    摘要： Heterophase junction construction is a powerful means of inhibiting recombination of photoinduced charge carriers. Herein, we prepared BiVO4/Bi4V2O10 porous heterophase nanospheres assembled by nanoflakes through a facile solvothermal process. The crystal structure of the porous nanospheres can be easily regulated from mixed phase of BiVO4 and Bi4V2O10 to pure BiVO4 by changing the solvothermal reaction time. The formation of heterophase junction BiVO4/Bi4V2O10 can greatly enhance the transfer and separation rate of photogenerated charge carriers. Meanwhile, the porous nanoflake-based nanosphere structure can enhance visible light utilization and organic pollutants adsorption. Benefiting from the synergy effects of these positive factors, the optimal BiVO4/Bi4V2O10 exhibits excellent visible light photocatalytic performance and cycling capability for the degradation of organic pollutants.

    关键词： porous nanospheres,heterophase junction,pollutants degradation,BiVO4/Bi4V2O10,visible light photocatalysis

    更新于2025-09-10 09:29:36

  • Structure, photocatalytic and antibacterial activity study of Meso porous Ni and S co-doped TiO2 nano material under visible light irradiation

    摘要： Undoped and Ni-S co-doped Mesoporous TiO2 nano materials were synthesized by using sol-gel method. The characteristic features of as prepared catalyst samples were investigated using various advanced spectroscopic and analytical techniques. The characterization results of the samples revelled that all the samples exhibited anatase phase (XRD), decreasing band gap (2.68 eV) (UV-Vis-DRS), small particle size (9.2 nm) (TEM), High surface area (142.156 m2/g) (BET), particles with spherical shape and smooth morphology (SEM), there is a frequency shift observed for co-doped sample (FT-IR) and the elemental composition electronic states and position of the doped elements (Ni and S) in the TiO2 lattice analyzed by XPS and EDX. These results supported the photocatalytic degradation of Bismarck Brown Red (BBR) achieved with in 110 min and also exhibited the antibacterial activity on Staphylococcus aureus (MTCC-3160), Pseudomonas fluorescence (MTCC-1688) under visible light irradiation.

    关键词： Sol-gel,photocatalysis under visible light,Antibacterial Activity,Ni-S co-doped TiO2,degradation of Bismarck Brown Red

    更新于2025-09-10 09:29:36

  • ZnO nanospheres based simple hydrothermal route for photocatalytic degradation of azo dye

    摘要： This novel work presents a promising application to use Zinc oxide nanospheres as nanocatalysts in photocatalytic degradation of methyl orange dye. The hydrothermal route was utilized in the synthesis process of ZnO nanospheres. The size of the synthesized ZnO nanoparticles is around 200-250 nm diameter. The synthesized nano-oxides were characterized utilizing several instruments such as X-ray diffraction, Brunauer, Emmett, and Teller (BET), and scanning electron microscope (SEM). The resulting nanoparticles are utilized as an efficient tool for degradation of methyl orange (MO) dye under UV radiation. Essential parameters were studied on degradation process involving the initial concentration of MO, pH, stirring the solution, dose of the ZnO nanospheres, the oxygen content of the solution, calcination of the nanomaterials. All activity experiments under UV radiation provide excellent results for the degradation process of MO. Also, the recovery of ZnO nanomaterials was investigated based on the photocatalytic process efficiency. The results show the high possibility of reuse ZnO nanospheres for several photocatalytic processes. Also, the nanocatalysts were applied for a real environmental sample with providing high photocatalytic performance.

    关键词： methyl orange,ZnO nanospheres,photocatalytic degradation,hydrothermal method,azo dyes

    更新于2025-09-10 09:29:36

  • Fabrication of Ag3VO4 decorated phosphorus and sulphur co-doped graphitic carbon nitride as a high-dispersed photocatalyst for phenol mineralization and E. Coli disinfection

    摘要： In this work, we have successfully anchored Ag3VO4 (AV) onto P and S co-doped g-C3N4 (PSGCN) to prepare high-dispersible AV/PSGCN photocatalyst via a deposition-precipitation method. The P and S co-doped g-C3N4 was synthesized via thermal polycondensation using hexachlorotriphosphazene (HCCP) and thiourea as precursors. AV/PSGCN was characterized using various spectral techniques. The atomic force analysis indicated that the thickness of AV/PSGCN was less than 3.0 nm. The zeta potential and Tyndall effect experiments ascertained formation of the well-dispersed suspension of AV/PSGCN in water. The co-doping resulted in lowering optical band gap of g-C3N4. The photoluminescence and electrochemical impedance analysis indicated suppression in recombination of photogenerated electron and hole pairs in AV/PSGCN. The photodegradation of phenol followed pseudo-first order kinetics. Hydroxyl radicals and holes were the two main reactive species for photodegradation of phenol. The COD, HPLC and LC-MS analyses confirmed mineralization of phenol in 6 h. Unlike conventional slurry type photo-reactors, AV/PSGCN was not magnetically agitated during photocatalytic reactions. AV/PSGCN exhibited significant antibacterial activity for E.Coli disinfection. The photodegradation of phenol and bacterial disinfection occurred through hole and hydroxyl radical formation mechanism.

    关键词： Phenol degradation,Enhanced photocatalytic activity,Heterojunction formation,Ag3VO4,Antibacterial activity,Co-doped g-C3N4

    更新于2025-09-10 09:29:36

  • Optical Amplifiers - A Few Different Dimensions || Introductory Chapter: A Revisit to Optical Amplifiers

    摘要： The modern age of information may be regarded as the era of fast-and high-bandwidth communication, which exploits fiber-optic communication system. Transmission of signals spanning distances of over thousand kilometers essentially causes signal degradation. Due to varieties of loss mechanisms in the medium (the optical channel used for transmission), there happens gradual attenuation in the power of signals being transmitted, as those propa- gate through a communication channel. Clearly, the attenuation imposed by the medium remains a serious issue that affects light propagating ultra-long distances through a fiber-optic cable (the communication link). The degradation of signal must be overcome, which makes the utilization of the process of amplification (of signal) vital. Further, in order for the information carried by a signal to be detectable at the receiving end, there must be a minimum amount of threshold power, which the signal must possess. As such, optical amplifiers, which would incorporate optical fibers and/or waveguides, remain indispensable in fiber-optic com- munication systems owing to the limitations imposed by the transmission channels/systems. These limitations would arrive in the form of fiber loss and dispersion, which are usually overcome by exploiting varieties of amplifiers. In reality, loss and dispersion are related to each other [1], which can be well-understood upon giving a thought to a pulse shape—more broad a pulse becomes (causing dispersion), more will be the decrease in power (causing loss), and vice-versa. In earlier days, optoelectronic repeaters were in use for the purpose of amplification, wherein the optical signal is first converted into an electric current, and then regenerated using a transmitter [2]. However, the process of regeneration used to be quite complex and expensive, in particular, when multichannel optical systems are in use. As such, the exploitation of optical amplifier evolved as the alternative approach for amplifying optical signals during transmis- sion. It is a device that directly amplifies an optical signal, without the need of conversion to an electrical signal—the feature needed in the so-called repeaters.

    关键词： loss mechanisms,fiber-optic communication,signal degradation,amplification,optical amplifiers

    更新于2025-09-10 09:29:36

  • Evaluation of color changes in PV modules using reflectance measurements

    摘要： The main objective of this paper is to investigate the possibility of evaluating the color changes in real photovoltaic modules from re?ectance measurements. To accomplish this main objective, the work has been organized into three main axis: (1). Exploring the possibility of using simpli?ed instrumentation and techniques for the measurement of color parameters in solar cells. (2). Identifying a simple parameter as an indicator of solar module color appearance and (3). Exploring the possibility of correlating that parameter with solar module degradation. It is explored the use of re?ectance and related magnitude Yellowness Index (YI) as an indicator of photovoltaic (PV) solar module surface color change and degradation. While spectrometric quantities as transmittance have been used as a measurement of separated encapsulant and backsheet characteristics, in the present paper re?ectance of the surface of real PV solar mono and polycrystalline modules are analyzed. With the objective of verifying the applicability of such measurements in real PV installations, the correctness of using simpli?ed measurement geometries and portable spectrometers is tested. It is found that 45°/45° and hemispheric re?ectance supply similar results. Consequently portable ?ber optic spectrometers and simple ?ber optic probes with their holders can be used. We found that 45°/45° and hemispheric re?ectance with their associated Yellowness Index can be used indistinctly in the cases analyzed as a good indicator of super?cial color changes. We have also concluded that Yellowness Index is a good indicator of changes in appearance in PV modules. It is observed an increase of Yellowness Index with ultraviolet dose supplied to a solar module and a reduction in its maximum power.

    关键词： Re?ectance,Degradation,Yellowness index,Photovoltaic

    更新于2025-09-10 09:29:36

  • ZnO/Ag–Ag2O microstructures for high-performance photocatalytic degradation of organic pollutants

    摘要： Organic pollutants cause serious impacts on environment. A novel method to synthesize ZnO/Ag–Ag2O microstructures was developed for organic pollutant photocatalytic degradation. The 3D pompon-like Zn(OH)1.68(SO4)0.16·0.58H2O microspheres were firstly synthesized in a creative way by combining reaction in ethanol/water mixing layer and room-temperature self-assembly together. The length of nanosheets on Zn(OH)1.68(SO4)0.16·0.58H2O microspheres was controlled from ~ 0.8 to ~ 4.4 μm successfully. The method reduced both the processing temperature and reaction time compared with conventional ripening, which shortened catalysts’ production cycle, reduced production cost and simplified production condition. It holds great potential for industrial application. As traditional nanocatalysts are not easy to recycle and the residual nanocatalysts are also potential danger to the environment, our microsized ZnO/Ag–Ag2O photocatalysts inherit advantages of both nanoparticles and microspheres with enhanced removal efficiency and excellent recycle ability. Ag–Ag2O nanoparticles in ZnO/Ag–Ag2O microstructures were used to enhance the photocatalytic performance. 83.2% and 96.3% degradation efficiencies of Congo red were achieved by pure ZnO and ZnO/Ag–Ag2O microstructures after 80 min irradiation by UV light. 78.2% and 95.6% degradation efficiencies of methylene blue were achieved by pure ZnO and ZnO/Ag–Ag2O after 40 min under UV radiation. The degradation rate constants by ZnO/Ag–Ag2O microstructures are 0.04056 min?1 for Congo red and 0.07629 min?1 for methylene blue respectively. The ZnO/Ag–Ag2O photocatalyst showed excellent stability and reusability, since it was reused at least 5 times without any extra treatment. The ZnO/Ag–Ag2O microstructures may hold potential for organic pollutant treatments.

    关键词： Photocatalytic degradation,Congo red,Self-assembly,3D pompon-like ZnO,ZnO/Ag–Ag2O microstructures

    更新于2025-09-10 09:29:36

  • Preparation of activated carbon nanotube foams loaded with Ag-doped TiO2 for highly efficient photocatalytic degradation under UV and visible light

    摘要： Titanium oxide (TiO2) has been widely investigated as a photocatalytic material for degradation of organic pollutant in waste water. However, nanosized granular TiO2 nanoparticles are hard to be recycled and re-utilized in water and many cause secondary pollution of water. Hence, we constructed a foam-like photocatalyst, which was composed of carbonaceous support: activated carbon nanotube foams and Ag-doped TiO2 nanoparticles through a method of a template synthesis and carbonization strategy. The as-prepared photocatalyst evidenced to be hierarchical macroporous and mesoporous and exhibited remarkable photocatalytic performance toward the degradation of unsymmetrical dimethylhydrazine under UV and visible light. The structure characterization and photocatalytic performance investigation confirmed that the enhanced photoresponse was attributed to the high efficiency of charge separation and the surface plasmon resonance effect of metallic Ag. The adsorption synergetic effect of the hierarchical porous structure also played an important role in photodegradation. The as-prepared photocatalyst showed great potential in the treatment of waste water containing organic pollutant.

    关键词： Ag-doped TiO2,Photocatalytic degradation,Activated carbon nanotube foams,Unsymmetrical dimethylhydrazine,UV and visible light

    更新于2025-09-10 09:29:36

  • Electrospun Nanofibers Containing TiO2 for the Photocatalytic Degradation of Ethylene and Delaying Postharvest Ripening of Bananas

    摘要： The study aimed to develop a nanofiber film for photocatalytic degradation of ethylene and slowing down the ripening of banana fruit. Nanofibers containing different amounts of TiO2 nanoparticles (1 wt%, 5 wt%, and 10 wt%) were prepared using electrospinning method. Nanofibers containing 5 wt% TiO2 exhibited a nano-scale structure, good nanoparticle uniformity, and an anatase phase as characterized by scanning electron microscopy, energy dispersive X-ray spectrometer, transmission electron microscopy, and X-ray diffraction. Nanofibers containing 5 wt% TiO2 were tested in a photocatalytic reactor and showed higher photocatalytic activity for the degradation of ethylene. The utility of the photocatalytic reaction was further confirmed via a banana fruit-ripening test. The TiO2 nanofiber successfully delayed the color change and softening of bananas during storage. The results suggest that the TiO2 nanofiber offers photocatalytic degradation of ethylene and could potentially be used as packaging material for delaying postharvest fruit ripening.

    关键词： Electrospun nanofiber,TiO2,Banana ripening,Ethylene degradation,Photocatalysis

    更新于2025-09-10 09:29:36

  • Achieving efficient H2O2 production by a visible-light absorbing, highly stable photosensitized TiO2

    摘要： In this paper we propose titanium dioxide modified with cobalt(II) 2-ethylhexanoate (Co@TiO2) as photoactive material for the efficient visible light driven production of H2O2. We demonstrate that visible light activity can be achieved thanks to a photoinduced electron transfer from the excited complex towards the TiO2 conduction band that corresponds to a cobalt-to-titanium-charge-transfer transition. H2O2 is synthetized by a combination of oxygen reduction and water oxidation, that is possible thanks to the correct band position of Co@TiO2. A mechanism of H2O2 formation is suggested on the basis of experimental evidences. Reactive oxygen intermediates, together with H2O2 are responsible for the photocatalytic degradation of a nonionic surfactant, of methylene blue and of phenol for wastewater treatments. Finally, and quite interestingly, Co@TiO2 can be also used in a photoelectrochemical setup, where it can be adopted both as photoanode and photocatode, and the switching potential corresponds to the redox potential of the adsorbed complex Co(III)/Co(II) couple.

    关键词： photosensitization,charge carrier injection,cobalt(II) 2-ethylhexanoate,surfactant degradation,photocatalysis

    更新于2025-09-10 09:29:36