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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
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Synthesis of In2S3/UiO-66 hybrid with enhanced photocatalytic activity towards methyl orange and tetracycline hydrochloride degradation under visible-light irradiation
摘要： In this study, a series of In2S3/UiO-66 (ISU) hybrids have been fabricated through the growth of In2S3 nanoparticles onto the surface of UiO-66 via a facile hydrothermal process. The as-obtained samples have been characterized by PXRD, SEM, TEM, XPS, UV–Vis DRS, PC, PL and BET. The photocatalytic performance is evaluated by methyl orange (MO) and tetracycline hydrochloride (TCH) degradation under visible light irradiation. The results show that the In2S3/UiO-66 hybrids exhibit a higher photocatalytic activity than that of the pure In2S3 and UiO-66. Interestingly, the ISU-40% possesses the highest photodegradation e?ciency towards MO and TCH, which can be attributed to the strong visible light absorption, high speci?c surface area as well as e?ective separation of photo-generated electrons and holes. In addition, the photocatalysis mechanism in MO degradation process is also explored.
关键词： Hybrids,Visible light,In2S3/UiO-66,Methyl orange,Photocatalysis mechanism,Tetracycline hydrochloride
更新于2025-09-10 09:29:36
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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
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Visible-light photocatalytic fuel cell with Z-scheme g-C3N4/Fe0/TiO2 anode and WO3 cathode efficiently degrades berberine chloride and stably generates electricity
摘要： A visible-light Z-scheme g-C3N4/Fe0/TiO2 anodic catalyst was tested with cathodic WO3 in photocatalytic Fuel Cell (PFC) that efficiently degrades berberine chloride and simultaneously generate electricity at pH 2,5,7 and 13. The Stainless-steel mesh electrodes loaded with prepared catalyst were irradiated by visible-light in single chamber PFC. The highest removal of berberine Chloride, cell voltage, and power density were 91%, 0.8 V, and 16.4 W/m2 at a current density of 2.02 mA/cm2, respectively after 90 min irradiation in 0.05 M Na2SO4 electrolyte, with 10 ? external resistance. The impacts of pH and initial concentration of BEC on photocatalytic degradation and cell voltage were evaluated. The cell current density is enhanced while the photocatalyst activity increased. The constructed PFC maintained high-performance after 5 uses. Its use in degrading wide spectrum refractory pollutants and generate electricity is expected for the proved catalyst design, paired electrodes and high PFC performance for practical wastewater treatment.
关键词： Electricity generation,WO3,Visible-light,g-C3N4/Fe0/TiO2,Photocatalytic Fuel Cell,Berberine Chloride,Z-scheme
更新于2025-09-10 09:29:36
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Enhanced visible light photocatalytic activity of zno nanoparticles modified by cyclized polyacrynitrile
摘要： The ZnO/cyclized polyacrylonitrile (CPAN) composites were prepared by impregnation and heat treatment process. The morphology, crystal internal structure of ZnO/CPAN nanocomposites were characterized by UV-vis-diffuse reflectance spectroscope (DRS), X-ray diffraction, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The visible light photocatalytic activity of ZnO/CPAN was evaluated by degradation of methyl orange under xenon lamp irradiation. The DRS results indicate that the absorption of ZnO/CPAN nanocomposites in the visible region was significantly higher than that of pure ZnO nanoparticles. The TEM results show that the surface of ZnO nanoparticles is occupied by the CPAN in small amount. The results of photocatalytic experiment show that the photocatalytic activity of ZnO nanoparticles can be improved significantly by the modification of CPAN. The possible photocatalytic mechanism was also discussed.
关键词： visible light,photocatalytic activity,nanocomposite,ZnO/CPAN
更新于2025-09-10 09:29:36
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Function-integrated Ru catalyst for photochemical CO2 reduction
摘要： Visible-light driven catalytic reduction of CO2 is at the heart of artificial photosynthesis. Here, we demonstrate the first example of a Ru complex that can function both as a photosensitizer and catalyst for CO2 reduction. The catalyst exhibited excellent activity for CO evolution with a high turnover number (TON, 353 for 24 h), reaction rate (TOF, 14.7 h?1), and product selectivity (97%) under visible-light irradiation. We also succeeded in selective product formation (CO or HCOOH) by changing the basicity of the reaction media. This finding will open new avenues for visible-light driven photoredox catalysis using Ru-based function-integrated photocatalysts.
关键词： Ru complex,visible-light,artificial photosynthesis,CO2 reduction,photocatalysis
更新于2025-09-10 09:29:36
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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
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Architecture of Biperovskite-Based LaCrO <sub/>3</sub> /PbTiO <sub/>3</sub> p–n Heterojunction with a Strong Interface for Enhanced Charge Anti-recombination Process and Visible Light-Induced Photocatalytic Reactions
摘要： Erection of a resourceful p?n heterojunction is a state-of-the-art tactic to flourish the charge anti-recombination process at the heterojunction interface and boost the photocatalytic activities under visible light irradiation. In the present work, we have engineered a new series of PbTiO3/LaCrO3 (PT/LC) p?n heterojunction through a facile two-step combustion process. The structural, interface, and optical analysis distinctly revealed a strong intact between p-type LaCrO3 and n-type PbTiO3, elucidating their electronic channelization and substantial reduction of electron?hole recombination at the PbTiO3/LaCrO3 interface, which extend the lifetime and population of photogenerated charges in the p?n heterojunction material. The asymmetry photocurrent in the opposite directions and an inverted characteristic V-shape Mott?Schottky plot of the optimal PT/LC (7/3) material demonstrated the construction of a p?n heterojunction. The optimal p?n heterojunction possesses excellent photo-stability, and it revealed the highest photocatalytic activity toward degradation of phenol, that is, 86% and hydrogen generation, that is, 343.57 μmol in 2 h. The enhanced photocatalytic activities of the p?n heterojunction materials in comparison to pristine ones are due to the higher separation charge carriers across the p?n heterojunction interface, which was deeply elucidated by carrying out electrochemical impedance spectroscopy, time-resolved photoluminescence spectroscopy, and photoluminescence analyses. These materials pave a new way to design the interface intact photocatalyst with an ultrafast approach for migration of photoexcited electrons across the p?n heterojunction and enhance the photocatalytic activities.
关键词： p?n heterojunction,PbTiO3/LaCrO3,visible light irradiation,photocatalytic activities,charge anti-recombination
更新于2025-09-10 09:29:36
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Dual Catalytic Switchable Divergent Synthesis: An Asymmetric Visible-light Photocatalytic Approach to Fluorine-containing γ-Keto Acid Frameworks
摘要： Herein, we describe a novel and efficient method for constructing a series of fluorine-containing γ-keto acid derivatives through combining visible-light photoredox catalysis and chiral Lewis acid catalysis. With this dual catalytic strategy, a variety of chiral γ-keto amides containing a gem-difluoroalkyl group and a series of fluorine-containing α,β-unsaturated-γ-keto esters were successfully constructed with high stereoselectivities, respectively. A series of experiments showed that the chemoselectivity of this process was highly dependent on the fluorine reagents besides the Lewis acid catalysts. This approach facilitates rapid access to γ-keto acid derivatives, an important class of precursors for pharmaceuticals, plasticizers, and various other additives.
关键词： γ-keto acid derivatives,chiral Lewis acid catalysis,visible-light photocatalysis,asymmetric difluoroalkylation
更新于2025-09-10 09:29:36
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Effective protect of oxygen vacancies in carbon layer coated black TiO2-x/CNNS hetero-junction photocatalyst
摘要： Carbon layer coated black TiO2-x/g-C3N4 nanosheets (C@TiO2-x/CNNS) heterojunction photocatalysts were successfully prepared via a polydopamine dopamine carbonization route for the first time. It was found that the hydrogen evolution rate of C@TiO2-x/CNNS was 417.2 μmol h-1 g-1 under visible light irradiation, which was much higher than that of other prepared photocatalysts in solar water splitting process at the same conditions, and obvious decrease in catalytic activity can be observed after three recycles. The formation of carbon layer on the surface of TiO2-x can effectively protect Ti3+ and oxygen vacancies (Ovs) from oxidation by air and dissolved O2, afterwards much more Ti3+/Ovs are exsited, which can serve as charge carrier traps to inhibit the recombination of light-excited electrons-holes. Therefore, C@TiO2-x/CNNS showed a highly conductivity, rapidly effective electron-hole separation and lower transmission resistance comprehensive consideration of the advantages of carbon layer and hetero-junction, which are of great benefit to the improvement of photocatalytic performance. Hence, a new catalytic tactic namely layer-protection effect was founded and this strategy for boosting hydrogen evolution and protection Ti3+/Ovs may give us some hints on the design of photocatalytic systems.
关键词： black TiO2,visible light H2 evolution,g-C3N4 nanosheet,carbon layer protect oxygen vacancy
更新于2025-09-10 09:29:36