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Cu(OH)2 Nanostructures for Dynamic Photodegradation of Methyl Orange under Visible Light
摘要： A new material of Cu(OH)2 nanostructures was prepared using cupric nitrate and sodium hydroxide as raw materials by the chemical precipitation method. The Cu(OH)2 nanostructures were characterized by scanning electron microscope, transmission electron microscopy, infrared spectrometer, and X-ray diffractometer. The results showed that the Cu(OH)2 nanostructures exhibited excellent uniform and dispersion at 40°C. A series of factors was investigated to effect the photocatalytic efficiency of methyl orange (MO), such as the concentration of Cu(OH)2 nanostructures, the reaction time of the Cu(OH)2 nanostructures, the initial concentration of MO, and so on. As a result, the Cu(OH)2 nanostructures exhibited excellent photocatalytic efficiency with the concentration of 20 mg L–1 Cu(OH)2 nanostructures, the initial concentration of MO was 15 mg L–1 and the stirring time was 70 min.
关键词： photocatalytic efficiency,chemical precipitation method,Cu(OH)2 nanostructures
更新于2025-09-23 15:22:29
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Novel and efficient synthesis of Ag-ZnO nanoparticles for the sunlight-induced photocatalytic degradation
摘要： Plasmonic metal-semiconductor nanostructures endow them with an enormous potential application in photocatalysis, however, the uniform deposition of metal NPs as small as a few nanometers remains a challenge. Here, we demonstrate the effectiveness of two-step polymer-network gel process in the synthesis of Ag-ZnO nanocatalyst with superior photocatalytic properties. Because of uniform distributed Ag NPs, large specific surface area and abundant surface oxygen vacancies, the Ag-ZnO nanoparticles exhibit a super high photocatalytic efficiency in comparison to pure ZnO nanoparticles. The efficiency can be further improved by optimizing the external factors, such as catalyst dosage, ambient temperature and initial solution pH. Good stability and practicability indicate its potential application in environmental purification. Our work does not only provide a feasible strategy for the synthesis of high property Ag-ZnO nanophotocatalysts, but also enriches the understanding of metal-metal oxide nanostructures.
关键词： Surface oxygen vacancy,Photocatalytic efficiency,Nano-heterostructure,Two-step strategy,Ag-ZnO
更新于2025-09-19 17:15:36
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The effect of CdO content on the crystal structure, surface morphology, optical properties and photocatalytic efficiency of p-NiO/n-CdO nanocomposite
摘要： Pure NiO nanoparticles and NiO-CdO nanocomposite were prepared with different content of CdO by simple chemical precipitation method at 800 °C for 3 h. Crystal structure, surface morphology, elemental composition and function groups present in the prepared samples were characterized by XRD, SEM, EDX, Raman and FTIR analysis, respectively. From XRD, preparation of pure NiO and formation of nanocomposite samples confirmed by the presence of characteristic diffraction peaks of cubic phase structure of NiO and CdO. The particle size increases from 26 to 34 nm with the increase of CdO content in the prepared samples. SEM images show the spherical shape of NiO and plate like shape of nanocomposite samples. The EDX analysis revealed that the absence of any impurity peaks indicates the high quality of prepared samples. Raman and FTIR spectra show the fundamental peaks of NiO and CdO in the samples. The best photodegradation efficiency of methyl orange dye i.e. 60% was achieved as a result of the decrease in the energy band gap from 3.42 to 2.92 eV at the optimum content of CdO (0.12 wt.%).
关键词： Photocatalytic efficiency,Raman analysis,Nanocomposite,Optical properties,XRD
更新于2025-09-10 09:29:36
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Synergistic Effect of the Electronic Structure and Defect Formation Enhances Photocatalytic Efficiency of Gallium Tin Oxide Nanocrystals
摘要： The design of photocatalysts with enhanced efficiency is pivotal to sustainable environmental remediation and renewable energy technologies. Simultaneous optimization of different factors affecting the performance of a photocatalyst, including the density of active surface sites, charge carrier separation, and valence and conduction band redox potentials, remains challenging. Here we report the synthesis of ternary gallium tin oxide (GTO) nanocrystals with variable composition, and investigate the role of Ga3+ dopants in altering the electronic structure of rutile-type SnO2 nanocrystal lattice using steady-state and time-resolved photoluminescence spectroscopies. Substitutional incorporation of Ga3+ increases the band gap of SnO2 nanocrystals, imparting the reducing power to the conduction band electrons, and causes the formation of acceptor states, which, in conjunction with electron trapping by donors (oxygen vacancies), leads to stabilization of the photoexcited carriers. Combination of a decrease in the charge recombination rate and adjustment of the conduction band reduction potential to more negative values synergistically promote the photocatalytic efficiency of the GTO nanocrystals. The apparent rate constant for the photocatalytic degradation of rhodamine-590 dye by optimally prepared GTO NCs is 0.39 min-1, more than two times greater than that by benchmark Aeroxide TiO2 P25 photocatalyst. The results of this work highlight the concept of using rational aliovalent doping of judiciously chosen metal oxide nanocrystal lattices to simultaneously manipulate multiple photocatalytic parameters, enabling the design of versatile and highly efficient photocatalysts.
关键词： photocatalysts,photocatalytic efficiency,nanocrystals,electronic structure,gallium tin oxide,defect formation
更新于2025-09-09 09:28:46