修车大队一品楼qm论坛51一品茶楼论坛,栖凤楼品茶全国楼凤app软件 ,栖凤阁全国论坛入口,广州百花丛bhc论坛杭州百花坊妃子阁

oe1(光电查) - 科学论文

过滤筛选

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） ▾

  • Pd/TiO2 @ Carbon Microspheres Derived from Chitin for Highly Efficient Photocatalytic Degradation of Volatile Organic Compounds

    摘要： Facing the serious air pollution caused by the volatile organic compounds (VOCs), the highly efficient degradation and removal of VOCs have attracted great attentions. To develop efficient novel photocatalysts, Pd/TiO2 @ carbon nanofibrous microspheres were constructed by carbonizing the TiO2/chitin microspheres, followed by immobilizing Pd nanoparticles on the TiO2/carbon microspheres via a green pathway. The composite microspheres were composed of carbon nanofibers, on which TiO2 nanoparticles and ultra-small Pd nanoparticles with mean size of 1 nm were well immobilized and distributed, supported by transmission electron microscope and elemental mappings results. The Pd/TiO2 @ carbon microspheres were used for the gas phase photodegradation of VOCs. The results demonstrated that the conversion of toluene and benzene to CO2 and H2O reached 96.4% and 91.7%, respectively, which were higher than the reported values in the literatures. The combination of TiO2 and Pd nanoparticles played an important role on the enhancement of the catalytic activity. Moreover, the Pd/TiO2 @ carbon microspheres could be recycled and reused. This work provided a new strategy to eliminate VOCs, which was beneficial to a sustainable world.

    关键词： catalyst TiO2 nanoparticles,Chitin microsphere,Pd nanoparticles,degradation of volatile organic compounds,carbon nanofibers

    更新于2025-09-04 15:30:14

  • [ACS Symposium Series] Raman Spectroscopy in the Undergraduate Curriculum Volume 1305 || Analysis of Over-the-Counter Drugs Using Raman Spectroscopy

    摘要： Commercial over-the-counter drugs such as Advil?, Aleve?, Tylenol?, Mucinex?, Excedrin?, and aspirin were analyzed with a portable handheld Raman spectrometer. The peaks from their Raman spectra were determined, and common peaks were observed in all samples. Unique peaks were also noticed and used as identifying markers to identify a particular drug. Theoretical calculations of active ingredients present in drugs were also performed, compared with experimental Raman spectra, and used to assign the functional groups responsible for the peaks. In addition, Raman spectra obtained from a benchtop instrument were also compared with that from a portable Raman spectrometer. Different forms and brands of the drugs were also analyzed to determine the effect of other materials on the active ingredient. Results showed that the dosage of active ingredients has a direct impact on the signals exhibited in Raman spectra. Lastly, different degradation processes (exposure to microwaves, UV light, and high temperature) were tested on Tylenol? and results showed peak changes in certain regions and more fluorescence background.

    关键词： active ingredients,Raman spectroscopy,over-the-counter drugs,degradation processes,portable handheld Raman spectrometer

    更新于2025-09-04 15:30:14

  • BixTiyOz-Fe multiphase systems with excellent photocatalytic performance in the visible

    摘要： New photocatalysts based on bismuth titanates doped with iron with outstanding visible photocatalytic activity were prepared by a facile hydrothermal method followed by incipient wetness impregnation. The starting material was composed by three phases; majority of Bi20TiO32 closely interconnected to Bi4Ti3O12 and amorphous TiO2. Fe doping increased the already very high visible activity of the original material. The high visible activity showed by these materials could be ascribed to a combination of several features; i.e. low band gap energy value (as low as 1.78 eV), a structure allowing a good separation path for visible photogenerated electron-holes pairs and a relatively high surface area. Fe doping could be acting as bonding paths for the bismuth titanates phases, and the amount of Fe on the surface was found to be a crucial parameter on the photocatalytic activity of the materials. Visible activity of the best photocatalyst was superior to UV-Activity of commercial TiO2 P25 used as reference in same experimental conditions.

    关键词： Fe doping,Bi20TiO32,Bi4Ti3O12,Visible photocatalysis,Phenol degradation

    更新于2025-09-04 15:30:14

  • Degradation of melamine in aqueous systems by vacuum UV-(VUV-) photolysis. An alternative to photocatalysis

    摘要： VUV-irradiation experiments with aqueous solutions of melamine and related triazine derivatives were carried out in the presence or absence of molecular oxygen. Substrate degradation, total organic carbon and evolution profiles of intermediates were monitored. Relevant mineralization of the substrates was observed, in particular for melamine, its extent depending on the concentration of dissolved O2 and on the number of amino substituents at the s-triazine moiety of the substrate. In all experiments, cyanuric acid was found to be the only persistent final product. Experimental results indicate that the route of reactions leading to mineralization is independent of that leading to amino group substitution. Mechanistic hypotheses are proposed and compared with findings coming from TiO2-based photocatalysis.

    关键词： Photocatalysis,Melamine degradation,Cyanuric acid,VUV,Mineralization

    更新于2025-09-04 15:30:14

  • Enhanced visible-light photoelectrochemical hydrogen evolution through degradation of methyl orange in a cell based on coral-like Pt-deposited TiO2 thin film with sub-2 nm pores

    摘要： TiO2 nanoparticles exhibit good photocatalytic activity for hydrogen evolution through water splitting; however, they demonstrate weak activity under visible light irradiation due to the wide band gap of TiO2. Deposition with noble metals such as platinum, as cocatalyst, led to the red-shift of the absorption edge of rutile TiO2; however, its activity is not significant for the photoelectrochemical (PEC) degradation of azo dyes such as methyl orange (MO). Herein, we investigated the photoelectrocatalytic degradation reaction of MO in a PEC cell based on Pt-deposited TiO2 thin film. The performance of the cell increased through the formation of mesoporous coral-like structures with sub-2 nm pores and the formation of defect states on the electrode surface. UV–vis studies confirmed, when methanol was added, the PEC cell exhibited a much higher MO degradation efficiency (99.6% after 28 min UV irradiation) than in the absence of methanol (64.7%). GC–MS studies confirmed the oxidation of methanol to formaldehyde, reacting on the electrode surface, followed by the reduction of the protons into hydrogen over the Pt sites. Also, the conversion of formaldehyde to formic acid and formic acid to CO2 are possible mechanisms to increase the hydrogen evolution rate to 418 μmol/h under visible light irradiation. Reaction of adsorbed active species within the surface of coral-like TiO2 structures with sub-2 nm pores provides high activity of the proposed PEC cell for visible-light-driven water splitting. These research studies may be continued to the design of other efficient semiconductor photocatalysts.

    关键词： Photoelectrocatalytic activity,Photoelectrochemical cell,Coral-like TiO2 nanopores,Hydrogen production,Dye degradation

    更新于2025-09-04 15:30:14

  • Stability study of natural green dye based DSSC

    摘要： Evolution of solar cell based on natural molecules flourished expeditiously, which is a good alternative for silicon-based solar cells or thin film technologies due to their low assembling cost, lightweight and flexibility. But natural dye-based dye-sensitized solar cell (DSSC) has low cell efficiency and stability, which limits the use of organic solar cells. In this research, natural green dye extracted from spinach (Spinacia oleracea) and used as a sensitizer source for natural dye-based DSSC. The measured cell efficiency of natural green dye-sensitized DSSC was 0.398%. Also, the cell stability test has been carried out by measuring the degradation rate (cell efficiency) by aging the dye molecule for DSSC has been conducted after 48, 96, 144 and 196 hours under 100mW/cm2 illumination (1.5 AM) at the ambient condition.

    关键词： natural green dye,degradation,DSSC,chlorophyll,TiO2,stability

    更新于2025-09-04 15:30:14

  • Preparation of C60 Nanowhiskers/NiS2 Nanocomposites and Photocatalytic Degradation of Organic Dyes

    摘要： [C60]Fullerene nanowhiskers/NiS2 nanocomposites were prepared by a reaction of NiS2 nanoparticles and C60 nanowhiskers. The C60 nanowhiskers (FNWs) were synthesized by a liquid-liquid interfacial precipitation method using solvent solutions, such as benzene and toluene saturated with C60 powder and isopropyl alcohol. The NiS2 nanoparticles were synthesized by a reaction of NiCl2·H2O and Na2S2O3·5H2O in deionized water under microwave irradiation. The C60 nanowhiskers/NiS2 nanocomposites were calcined in an electric furnace at 700 °C for 2 h. The C60 nanowhiskers/NiS2 nanocomposites were characterized by X-ray diffraction and UV-visible spectrophotometry. The C60 nanowhiskers/NiS2 nanocomposites were evaluated as a photocatalyst by UV-visible spectrophotometry in the degradation of organic dyes, such as methylene blue and brilliant green, under ultraviolet light at 365 nm.

    关键词： [C60]Fullerene nanowhiskers,Brilliant green,NiS2 nanoparticles,Photocatalytic degradation,Methylene blue

    更新于2025-09-04 15:30:14

  • Preparation of TiO2/Fe2O3/Chitosan Nanocomposite Films and Its Photocatalytic Degradation of Rhodamine B

    摘要： A new photocatalytic thin films TiO2/Fe2O3/chitosan was synthesized by a solution casting technology to degrade the azo coloured compounds in the industrial waste water. The prepared TiO2/Fe2O3/chitosan was characterized by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy (HRTEM). TiO2 and Fe2O3 were entrpped in the chitosan film uniformly. The catalytic ability of TiO2/Fe2O3/chitosan was evaluated by photodegradtion of Rhodamine B. About 99.4 % Rhodamine B were photodegraded by 0.5 g L-1 photocatalyst under solar lights irradiation for 120 min. The influence of the reaction pH has been well investigated. And TiO2/Fe2O3/chitosan has good stability and reusability, it is suitable for the practical industrial waste water treatment.

    关键词： Photocatalytic degradation,Chitosan,Fe2O3,TiO2

    更新于2025-09-04 15:30:14

  • 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)] - Synthesis and photocatalytic activity of nanocomposite based on sodium alginate from brown algae with ZnO impregnation

    摘要： The objective of this research is to synthesize nano sodium alginate-ZnO nanocomposite as photocatalyst to degrade methylene blue compounds. The successful synthesis of nano sodium alginate-ZnO nanocomposite was supported by the characterization of XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared), SEM (Scanning Electron Microscope) and TEM (Tunneling Electron Microscope). The first stage of the research was the synthesis of nano sodium alginate with particle size 140 nm and crystallinity index 38.78 % by XRD and TEM characterization, the obtained particle size was 146 nm x 61 nm. Nano ZnO particle size 38 nm, by XRD and TEM characterization the obtained particle size was 56.6 nm x 33.3 nm. The next stage of nanocomposite synthesis of nano sodium alginate was the impregnation with nano ZnO particle size 130 nm, by XRD and TEM characterization the particle size was 228.0 nm x 134.2 nm. The success was also supported by FTIR and SEM characterization. The final stage was the degradation of blue methylene using nano-sodium alginate-ZnO nanocomposite. The highest degradation percentage by nano sodium alginate-ZnO nanocomposite with zinc nitrate concentration of 0.075 M was 51.68% with the first order rate constant of 9.5 x10-3 /min.

    关键词： methylene blue,nano ZnO,degradation,nanocomposite,nano sodium alginate

    更新于2025-09-04 15:30:14

  • Bimetallic metal organic frameworks: Magnetically separable heterogeneous catalyst for efficient organic transformation and photocatalytic dye degradation

    摘要： A new bimetallic MOF (BMOF) has been synthesized using iron and zinc as inorganic metal nodes and 1-4, benzenedicarboxylic acid (BDC) as organic linker molecule. BMOF was confirmed with Single crystal X-ray diffraction (SCXRD), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy-high angle annular dark-field imaging (TEM-HAADF), Field emission scanning electron microscopy-energy dispersive x-ray analysis (FESEM-EDX), Vibrating sample magnetometer (VSM) and inductively coupled plasma-mass spectrometry (ICP-MS) analysis. The synthesized BMOF shows excellent optical and magnetic properties. BMOF acts as a heterogeneous catalyst and show high catalytic activity towards bis(indolyl)methane synthesis and photocatalytic degradation of methylene blue (MB) under visible light illumination.

    关键词： Metal-organic frameworks,dye degradation,Bis(indolyl)methanes,photocatalysis

    更新于2025-09-04 15:30:14