- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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A multifunctional anionic 3D Cd(II)-MOF derived from 2D layers catenation: Organic dyes adsorption, cycloaddition of CO2 with epoxides and luminescence
摘要： An anionic Cd(II)-based metal-organic framework, {[Cd(L)(bpb)0.5(H2O)]·H2O·[(CH3)2NH2]+}n (HL-7, HL is the initial of the author Hui-Ling Liu; H3L = 2′,6′-dimethyl-[1,1′-biphenyl]-3,4′,5-tricarboxylic acid and bpb = 1,4-bis(pyrid-4-yl)benzene), has been hydrothermally synthesized and structurally characterized. Interestingly, HL-7 reveals a three dimensional (3D) frameworks which are constructed from catenation of 2D layers. Further studies prove that as an anionic framework, HL-7 could be a good candidate as adsorption materials for cationic organic dyes, such as methylene blue (MB+) and rhodamine B (RhB+). Moreover, catalytic properties for the cycloaddition of CO2 with epoxides and luminescent property of HL-7 are also investigated at normal temperature and pressure.
关键词： Catalysis,Dye adsorption,Luminescence,Metal-organic frameworks
更新于2025-09-19 17:15:36
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Surface plasmon-polariton: a novel initiation way for azide alkyne cycloaddition
摘要： Plasmon-catalysis has recently generated tremendous interest in the field of modern chemistry. Application of plasmon introduces the principally new stimuli for the activation of organic reactions, keeping the optical energy concentrated in the vicinity of plasmonic structure, creating optical near-field enhancement as well as hot electrons injection. In this work, for the first time, we presented a new way for the initiation of the azide-alkyne cycloaddition (AAC) using the surface plasmon-polariton wave, supported by the gold grating. With this concept in hand, the plasmon-active gold grating was functionalized with the 4-ethynylbenzenediazonium compound. Then, surface grafted 4-ethynylphenyl groups were plasmon activated and clicked with 4-azidobenzoic acid. Additional experiments excluded the potential effect of photon, heating, and metal impurities confirmed the key role of surface plasmon-polariton AAC activation. For investigation of plasmon-induced AAC mechanism, 4-azidophenyl groups (instead of 4-ethynylphenyl groups) were also grafted to the grating surface. Further careful evaluation of reaction kinetics demonstrates that AAC reaction rate is significantly higher in the case of acetylene activation than in the case of azide activation.
关键词： gold grating,azide alkyne cycloaddition,surface modification,plasmon catalysis,surface plasmon-polariton
更新于2025-09-19 17:15:36
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Enantioselective Photoorganocatalytic Synthesis of 1,4-Dicarbonyl Compounds
摘要： Stereocontrolled Synthesis of 1,4-Dicarbonyl Compounds by Photochemical Organocatalytic Acyl Radical Addition to Enals
关键词： dicarbonyls,enals,asymmetric catalysis,iminium ion activation,acyl radicals,photocatalysis
更新于2025-09-19 17:15:36
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Reduced graphene oxide@ceria nanocomposite-coated polymer microspheres as a highly active photocatalyst
摘要： Herein we report a facile two-step synthetic strategy for fabricating the ternary polystyrene/reduced graphene oxide/ceria (PS/RGO@CeO2) nanocomposite particles for the first time through the self-assembly of the RGO on the surface of PS microsphere (PS/RGO) and then the attachment of CeO2 nanoparticles (NPs) onto the as-prepared PS/RGO nanocomposite particles. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis have been employed to characterize the morphology and composition of the as-prepared samples. The size and mass loading of resulting CeO2 NPs on the PS/RGO nanocomposite particles are easily tunable. Furthermore, the photocatalytic performance of as-prepared ternary nanocomposite particles towards the degradation of methylene blue is investigated. Notably, the PS/RGO@CeO2 nanocomposite particles have high photocatalytic activity due to the synergistic effect between the CeO2 NPs and RGO in such a unique structure, and moreover, they also exhibit high stability in a recyclable manner. Therefore, it can be expected that our ternary nanocomposite particles are an attractive photocatalyst candidate for various photocatalytic applications.
关键词： polystyrene microsphere,ceria nanoparticle,reduced graphene oxide,nanocomposite particle,catalysis
更新于2025-09-19 17:15:36
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Rhodium-Catalyzed C–H Functionalization of Silicon-Substituted Alkanes
摘要： Harnessing the β-Silicon Effect for Regioselective and Stereoselective Rhodium(II)-Catalyzed C–H Functionalization by Donor/Acceptor Carbenes Derived from 1-Sulfonyl-1,2,3-triazoles
关键词： alkylsilanes,rhodium catalysis,sulfonyltriazoles,C–H functionalization
更新于2025-09-19 17:15:36
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Evaluation of the hydraulic and hydrodynamic parameters influencing photo-catalytic degradation of bio-persistent pollutants in a pilot plant
摘要： A kinetic study on the photo-catalytic degradation of bio-persistent micro-pollutants, as methyl red and methylene blue dyes, was carried out on an innovative unit by changing the hydraulic and hydrodynamic parameters of the system. The catalyst (TiO2, anatase) was embedded into a cement matrix and deposited at the bottom of a channel to activate the UVB photo-degradation reactions. The influence of the catalyst dosage, substrate concentration c0, and pH was evaluated on the degradation rates. The optimum catalytic dose was obtained at 0.79 g/cm3 while the best results were observed at 0.7 mg/L influent dye concentration. The pH of the solution influenced the sorption phenomena because the charge of the substrates functional groups as well as the charge of the catalyst surface were affected by this parameter. Different unit geometries, hydraulic loads (hw) and gradients (i) affected speed and flow-rate (Q) of the liquid phase and, as a consequence, the irradiated retention times (Irt) of the substrates to the UV/TiO2 system. Kinetics resulted faster at increasing flow-rates of the liquid flowing through the channel, constant the hydraulic load, whereas the increase in the hydraulic load did not improve the performances. Finally, degradation rates slightly decreased after the increase in the hydraulic gradient of the channel.
关键词： Organic micro-pollutant removal,Hydraulic and hydrodynamic parameters,Kinetic study,Photo-catalysis,Textile wastewater,Pilot plant
更新于2025-09-19 17:15:36
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Photocatalytically active filtration systems based on modified with titanium dioxide PET-membranes
摘要： Photocatalytically active nanostructured filtration systems are formed by two-step hydrolysis of titanium dioxide on the surface of polyethylene terephthalate ion-track membranes. Characterization of the morphological and structural properties of the nanosized TiO2 deposit obtained under various conditions on the surface of ion-track membranes is carried out, and the correlation of the TiO2 parameters with the synthesis conditions is established. The absorption spectra of the obtained systems were measured. Methods of the enhancing the operating wavelength range to increase the efficiency of potential application of photocatalytically active nanostructured TiO2 systems under the influence of sunlight are discussed.
关键词： Polyethylene terephthalate membranes,Ion-track technology,Catalysis,Modification,TiO2
更新于2025-09-19 17:15:36
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Hot carriers generated by plasmons: where are they are generated and where do they go from there?
摘要： A physically transparent unified theory of optically and plasmon-induced hot carrier generation in metals is developed with all the relevant mechanisms included. Analytical expressions that estimate the carrier generation rates, their locations, energies and directions of motion are obtained. Among four mechanisms considered: interband absorption, phonon and defect assisted absorption, electron-electron scattering assisted absorption, and surface –collision assisted absorption (Landau damping), it is the last one that generates hot carriers which are most useful for practical applications in photo detection and photo catalysis.
关键词： plasmons,Landau damping,photo detection,hot carriers,absorption mechanisms,photo catalysis
更新于2025-09-19 17:15:36
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Dispersed Nano-MOFs via a Stimuli-Responsive Biohybrid-System with Enhanced Photocatalytic Performance
摘要： MOF-based heterogeneous catalysts with enhanced dispersibility in solution are highly promising for liquid-phase catalysis yet the preparation remains a great challenge. Herein, via introducing responsive polymer-functionalized hollow pollen pivots, a general strategy toward preparing MOF@Pollen composites with adjustable dispersibility, environment-responsive activity and significantly enhanced liquid-phase photocatalytic performance is presented.
关键词： switchable catalysis,nanoMOFs,stimuli responsive polymer,dispersion
更新于2025-09-19 17:15:36
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Bi-component synergic effect in lily-like CdS/Cu <sub/>7</sub> S <sub/>4</sub> QDs for dye degradation
摘要： CdS has attracted extensive attention in the photocatalytic degradation of wastewater due to its relatively narrow bandgap and various microstructures. Previous reports have focused on CdS coupled with other semiconductors to reduce the photocorrosion and improve the photocatalytic performance. Herein, a 3D hierarchical CdS/Cu7S4 nanostructure was synthesized by cation exchange using lily-like CdS as template. The heterojunction material completely inherits the special skeleton of the template material and optimizes the nano-scale morphology, and achieves the transformation from nanometer structure to quantum dots (QDs). The introduction of Cu ions not only tuned the band gap of the composites to promote the utilization of solar photons, more importantly, Fenton-like catalysis was combined into the degradation process. Compared with the experiments of organic dye degradation under different illumination conditions, the degradability of the CdS/Cu7S4 QDs is greatly superior to pure CdS. Therefore, the constructed CdS/Cu7S4 QDs further realized the optimization of degradation performance by the synergic effect of photo-catalysis and Fenton-like catalysis.
关键词： Fenton-like catalysis,photocatalysis,CdS/Cu7S4,ion exchange,quantum dots,dye degradation
更新于2025-09-19 17:15:36