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A novel Co(II) based multifunctional metal-organic framework: synthesis, fluorescence sensing and magnetic analysis
摘要： A new coordination Co(II) complex, namely, [Co2(DIPT)4(PClA)2Cl2]·H2O ( NCl-1 ) ( DIPT= 2-(2,4-dichlorophenyl) -1H-imidazo [4,5-f]-[1,10]phenanthroline, HPClA=3-(2-chlorophenyl)acrylie ) has been synthesized under solvothermal conditions and structurally characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction analysis, nitrogen adsorption analysis and powder X-ray diffraction. NCl-1 constructed by six coordinated mode with metal center and connected different ligands and ions, exhibits a three-dimensional structure under interactions of hydrogen bond and π-π stacking interactions. The luminescence explorations demonstrated that NCl-1 exhibits highly selective and sensitive sensing for organic solvents ( MeOH ) and metal ion ( Fe3+ ). Furthermore, magnetic analysis indicated that NCl-1 also own the property of anti ferromagnetic.
关键词： Crystal structure,Magnetic property,Fluorescent sensing,Hydrothermal synthesis
更新于2025-09-11 14:15:04
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Photocatalyst properties depend on the mix
摘要： Photocatalysts use light to power chemical reactions in a whole host of applications from fuel cells to water remediation. There are many ways to improve the performance of titania (TiO2) photocatalysts from using catalyst support materials, which increase photosensitization rates, and help break down organic pollutants, to doping or co-doping with other atoms to expand the absorption range. Since using metal atoms such as dopants is problematic for water treatment if they leach into the environment, non-metallic dopants like nitrogen (N) are considered safer. Researchers from the University of South Africa have used these two strategies in conjunction to produce N-doped TiO2 photocatalysts on a carbon nanotube (CNT) support and systematically compared the effects of using different synthesis routes. Edward N. Nxumalo and his team find that photocatalysts with distinctly different properties and performance are produced depending on whether a hydrothermal or solgel synthetic route is used.
关键词： Carbon nanotubes,Hydrothermal synthesis,Solgel synthesis,Nitrogen doping,Photocatalysts,TiO2
更新于2025-09-11 14:15:04
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Systematic enumeration and proficient chemical sensing applications of Eu3+@CeO2 nanocrystals
摘要： Current study displayed the application of hydrothermal method for the preparation of highly crystalline nanocrystals of Eu3+ doped cerium oxide (Eu@CeO2) particles. The influence of doping percentage and annealing effects were studied on the crystalline nature and morphology of particles. The size, optical properties and lattice parameters were calculated as a function of dopant concentrations and their discrepancies were explained in detail. Integration of Eu3+ ions on CeO2 could unlock a new trail to optimize the photoluminescence properties of formed nanocrystals. The generated oxygen vacancies (Vo··) have the ability to affect the characteristic features of cerium oxide in solid state. The variations in the nature of surface defect in presence of Eu3+ ions with CeO2 nanoparticles were explained with the results of XPS studies. The obtained results validated that defect-induced band gap modification by Eu3+ ion doping on CeO2 could be employed as effective chemical sensor for harmful metal ions in real water samples.
关键词： photoluminescence,lattice parameter,crystalline,doped Cerium oxide,oxygen vacancies,hydrothermal
更新于2025-09-11 14:15:04
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High-Speed Growth of ZnO Nanorods in Preheating Condition Using Microwave-Assisted Growth Method
摘要： In this study, we present the microwave-assisted growth (MAG) of ZnO nanorods (ZNRs) using a preheating hydrothermal method under tailored preheating and postheating growth conditions. The perimeters such as solution concentration, preheating time, and postheating time, were changed to optimize ZNR growth and the growth was carried out in a domestic 850 watt microwave oven. Preheated solution was utilized as an accelerator to increase the aspect ratio of the ZNRs and reduce the fabrication time. Because of a long fabrication time and limited length in the conventional MAG method, preheating condition was used for ef?cient growth of nanorods through homogeneous nucleation in the solution and then heterogeneous nucleation of the formed ZNRs on seeded substrate during postheating process. The nanostructures were characterized with scanning electron microscopy to look at the morphology and dimensions. Dimensions of ZNRs kept on increasing as the molar concentration went higher. Preheating time highly affected the morphology, dimensions, and aspect ratio of ZNRs and postheating time not only ensured the stability of ZNRs with substrate due to heterogeneous nucleation process but also in?uenced the morphology of ZNRs.
关键词： Hydrothermal,Aspect Ratio,Microwave,Preheating,ZnO Nanorod
更新于2025-09-11 14:15:04
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Enhanced interaction in TiO<sub>2</sub>/BiVO<sub>4</sub> heterostructures via MXene Ti<sub>3</sub>C<sub>2</sub> derived 2D-Carbon for highly efficient visible-light photocatalysis
摘要： Heterostructured photocatalysts play a significant role in contaminants removal by decreasing the recombination of the photo-induced charges. Herein, we presented novel TiO2/C/BiVO4 ternary hybrids employing a two-dimensional (2D) layered Ti3C2 MXene precursor, overcoming lattice mismatching of TiO2/BiVO4 binary heterostructures simultaneously. Raman and XPS analyses proved the strongly coupling effects of TiO2, carbon and BiVO4 components, and the heterostructures were identified by HRTEM results. Moreover, the ternary TiO2/C/BiVO4 composites exhibit excellent photocatalytic performance of Rhodamine B degradation, which is about 4 times higher than pure BiVO4 and twice than binary TiO2/BiVO4 heterostructures, reaching a reaction constant of 13.7×10-3 min-1 under visible-light irradiation (λ>420 nm). In addition, the possible mechanism for dye elimination was proposed that RhB molecule was directly oxidized by photo-induced holes (h+) on the BiVO4 components and superoxide radical (O2·-) generated from conduction-band electrons of the heterostructures. This work will provide possibilities for developing visible-light responsive nanomaterials for efficient solar utilization.
关键词： Heterostructured TiO2/C/BiVO4,Hydrothermal,MXene,Photocatalysis
更新于2025-09-10 09:29:36
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Effect of pH Adjustment on Hydrothermal Synthesis of Aluminum Doped Zinc Oxide
摘要： Aluminum doped zinc oxide (AZO) was synthesized with various pH adjustments reagent (ammonia, TMAH, TEAH and TPAH) by hydrothermal reaction. Regardless of the pH adjustment, the main product of the synthesized powders with 5?mol% Al was zinc oxide. However, the diffraction peaks of gahnite (ZnAl2O4) were detected in the sample prepared from the precursor solutions with TMAH, TEAH and TPAH as pH adjustment. The excellent absorption property in near-infrared (NIR) region was obtained in the synthesized powder with about 2?mol% Al using ammonia. Based on these results, the initial state of Zn and Al ion in precursor solution is thought to affect the crystal phase of the product in hydrothermal synthesis. The NIR absorption property was highly enhanced by using urea as the pH-shift reagent during hydrothermal reaction process.
关键词： pH adjustment,Near-infrared reflectance,Hydrothermal synthesis,Aluminum doped zinc oxide
更新于2025-09-10 09:29:36
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Computational Chemistry Meets Experiments for Explaining the Geometry, Electronic Structure, and Optical Properties of Ca <sub/>10</sub> V <sub/>6</sub> O <sub/>25</sub>
摘要： In this paper, we present a combined experimental and theoretical study to disclose, for the first time, the structural, electronic, and optical properties of Ca10V6O25 crystals. The microwave-assisted hydrothermal (MAH) method has been employed to synthesize these crystals with different morphologies, within a short reaction time at 120 °C. First-principle quantum mechanical calculations have been performed at the density functional theory level to obtain the geometry and electronic properties of Ca10V6O25 crystal in the fundamental and excited electronic states (singlet and triplet). These results, combined with the measurements of X-ray diffraction (XRD) and Rietveld refinements, confirm that the building blocks lattice of the Ca10V6O25 crystals consist of three types of distorted 6-fold coordination [CaO6] clusters: octahedral, prism and pentagonal pyramidal, and distorted tetrahedral [VO4] clusters. Theoretical and experimental results on the structure and vibrational frequencies are in agreement. Thus, it was possible to assign the Raman modes for the Ca10V6O25 superstructure, which will allow us to show the structure of the unit cell of the material, as well as the coordination of the Ca and V atoms. This also allowed us to understand the charge transfer process that happens in the singlet state (s) and the excited states, singlet (s*) and triplet (t*), generating the photoluminescence emissions of the Ca10V6O25 crystals.
关键词： structural properties,electronic properties,Ca10V6O25,microwave-assisted hydrothermal method,photoluminescence,optical properties
更新于2025-09-10 09:29:36
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Modification of P25 titania in presence of hydrazine for <i>Staphylococcus aureus</i> inactivation
摘要： Titania and its polymorphs are one of the most studied semiconductor photocatalyst. Herein, the P25 titania was used as a precursor to modify the phase and structure with microwave assisted hydrothermal and sonochemical methods in presence of alkaline hydrazine. The outcome results show the cotton ball structure titanate composite phases (nanotubes, nanosheets and nanoparticles) and monoclinic titanate phase (TiO2-B) with microwave assisted hydrothermal method and sonochemical method, respectively. The nitrogen doping was confirmed by FTIR and DRS in modified TiO2. And some visible light absorption was observed in modified TiO2 due to the nitrogen doping. The composite phase titanate having cotton ball structure was found to be efficient for methicillin-resistant superbug Staphylococcus aureus (MRSA) inactivation. Herein, we also reported the submicron TiO2-B sword like morphology fabricated by sonochemical method for the first time in presence of alkaline hydrazine.
关键词： Bacterial inactivation,Titania,Sonochemical,Microwave assisted hydrothermal
更新于2025-09-10 09:29:36
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Bioinspired Synthesis of Carbon Dots/g-C <sub/>3</sub> N <sub/>4</sub> Nanocomposites for Photocatalytic Application
摘要： This study reports a fast and green preparative strategy to synthesize water soluble and fluorescent carbon quantum dots (CQDs) through hydrothermal method by using low cost organic waste of human fingernails as the carbon precursor for the first time. The coupling of CQD with pure carbon nitride (g-C3N4) was further explored to enhance the latter’s performance in photocatalysis of 2,4-dicholorophenol (2,4-DCP), a toxic and recalcitrant compound mostly released from industrial effluent. Such coupling overcame the weakness of pure g-C3N4 in photocatalysis process by broadening its visible light absorption and promoting the charge separation. As a result, the removal rate of CQD/ g-C3N4(10) was up to 71.53%, which was approximately 1.5 times higher than that of pure g-C3N4 under sunlight irradiation. The morphological structure, optical properties and chemical compositions of CQDs/g-C3N4 composites were characterized using various spectroscopic techniques including field emission scanning electron microscopy (FESEM), Energy Dispersive X-Ray (EDX) and Ultraviolet-visible diffuse reflectance spectra (UV-DRS).
关键词： Photocatalysis,Hydrothermal method,Carbon quantum dots,4-dichlorophenol,2,g-C3N4
更新于2025-09-10 09:29:36
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Influences of reaction temperature, holding time and S/Zn molar ratio on structure, morphology, optical and electrical properties of ZnS nanoparticles synthesized by hydrothermal method
摘要： ZnS nanoparticles were synthesized by hydrothermal method. The influences of reaction temperature, holding time and S/Zn molar ratio on the structure, morphology, optical and electrical properties of ZnS nanoparticles were studied systematically at the range of 90?°C to 180?°C, 6?h to 15?h and 1:2 to 2.5:1, respectively. The results indicate that the reaction temperature, holding time and S/Zn molar ratio have no influence on phase structure. All the samples belong to zinc blende cubic structure of ZnS. However, the reaction temperature has strong influences on the growth of crystals, optical and electrical properties due to LaMer theory and two-stage growth kinetics. When the reaction temperature increases from 90?°C to 180?°C, the crystallite sizes increase from 7.0?nm to 9.7?nm and the average particle sizes decrease from 21?nm to 14?nm; the emission peaks are red shifted from 445?nm to 460?nm and the emission intensity is increased by 4.4 times; the dielectric constant and dielectric loss decrease from 4.86 to 4.71 and 2.86 × 104 to 2.70 × 104, respectively. While, the holding time has slight influences on the growth of crystals, optical and electrical properties. And the emission band and emission intensity of ZnS nanoparticles can be adjusted by the S/Zn molar ratio. When the S/Zn molar ratio is less than 1:1 or equal to 1:1, the emission bands range from 400?nm to 600?nm centered at ~ 450?nm. When the S/Zn molar ratio is greater than 1:1, the emission bands range from 400?nm to 700?nm centered at ~ 540?nm.
关键词： Holding time,Optical properties,Reaction temperature,Hydrothermal method,S/Zn molar ratio,ZnS nanoparticles,Electrical properties
更新于2025-09-10 09:29:36