How does the wavelength of incident light affect the rate of catalysis in Cu2O?
Best insight from top research papers
The wavelength of incident light significantly influences the rate of catalysis in Cu2O. Cu2O nanoparticles have been studied for their photocatalytic properties, especially in dye degradation processes. Different wavelengths of light, such as green, blue, red, and amber, have been utilized to selectively degrade methylene blue dye peaks through Mie resonance mediated photocatalysis using Cu2O as a catalyst. Additionally, Cu2O/TNA/Ti junctions have shown higher photocurrent spectral responses due to the UV-visible light absorption of Cu2O, leading to improved photocatalytic properties compared to other junctions. Moreover, the absorption range of Cu2O/ZnO catalysts shifts from ultraviolet to visible light due to the doping of Cu2O, enhancing the degradation efficiency of methyl orange solution under visible light.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
25 Citations | Not addressed in the paper. |
20 Citations | The Cu2O/ZnO nanocomposite shifts absorption from UV to visible light, enhancing photocatalytic activity. This change allows for efficient decomposition of methyl orange under visible light irradiation. |
| The visible light wavelength influences Cu2O catalysis rate. Cu2O nanoparticles with irregular platelet shapes and graphene composites show enhanced photocatalytic activity under visible light, particularly at 200 watts. | |
| The wavelength of incident light affects the rate of catalysis in Cu2O, with Cu2O/TNA/Ti showing higher photocurrent spectral responses due to UV-visible light absorption compared to Cu2O/Ti and Cu2O/FTO. | |
| Different wavelengths of light (green, blue, red, amber) selectively degrade methylene blue peaks through Mie resonance mediated photocatalysis using Cu2O, impacting the catalytic rate. |
Related Questions
How does the energy transfer process vary between Ho2O3 and CuO doped glasses?5 answersThe energy transfer process between Ho2O3 and CuO doped glasses varies. In Ho2O3 doped glasses, the energy transfer process is not mentioned in the provided abstracts. However, in CuO doped glasses, the energy transfer process is dominated by the coulombic interaction mechanism. The abstract states that the CuO doped glasses exhibit an extended broad visible-near IR band, which is assumed to originate from octahedrally coordinated Cu2+ ions. This suggests that the energy transfer process in CuO doped glasses involves interactions between the Cu2+ ions. Additionally, the abstract mentions that the absorption spectra of CuO doped glasses reveal a distinct broad band due to the characteristic transition of cupric ion in the distorted octahedral sites. This further supports the presence of energy transfer processes involving the Cu2+ ions in CuO doped glasses.
Is gold acts as catalyst?5 answersGold acts as a catalyst in various reactions, including C-H bond functionalization, (cyclo)isomerization transformations, hydro coronation of alkynes, and heterogeneous catalytic reactions such as selective hydrogenation. Gold catalysts can be coordinated with different ligands, such as phosphines, N-heterocyclic carbenes, or anionic ligands, to achieve high selectivity in C-H bond functionalization reactions. Gold-based complexes are known for their ability to activate unsaturated groups and tolerate a wide range of functional groups and reaction conditions, making them efficient catalysts for generating complex molecular structures from accessible reactants. Supported gold nanoparticles, when deposited on various supports, exhibit unique catalytic properties due to factors such as support selection, nanoparticle size control, and strong junctions between the nanoparticles and supports. Gold catalyst particles embedded in the pore walls of mesoporous carbon show improved electron transfer and higher catalytic activity in hydrogenation reactions compared to traditional gold catalysts.
How does the addition of Cu impurities affect the photocatalytic performance of TiO2?4 answersThe addition of Cu impurities to TiO2 has been found to significantly affect its photocatalytic performance. Cu-doped TiO2 thin films showed improved photocatalytic activity compared to pure TiO2, as evidenced by the degradation of methylene blue dye solution. The presence of Cu impurities led to a reduction in the band gap energy of TiO2, resulting in increased light absorption in the UV-VIS range. This enhanced light absorption and lower recombination rate of the photoinduced electron hole pair contributed to the improved photocatalytic activity. Cu-doped TiO2 also exhibited higher catalytic activity in the decomposition of methylene blue dye solution, indicating its potential as a photocatalyst for environmental applications. The stabilization of the anatase phase and the shift of the emission band to the blue region were observed in Cu-doped TiO2, which further enhanced its photocatalytic activity. Theoretical modeling using Density Functional Theory (DFT) confirmed the modification of electronic properties of TiO2 upon Cu doping.
How does the presence of Cu impurities affect the photocatalytic activity of TiO2 in water?4 answersThe presence of Cu impurities in TiO2 has been found to significantly affect its photocatalytic activity in water. Cu-doped TiO2 thin films showed improved photocatalytic activity compared to pure TiO2, with higher photo activities observed at higher Cu concentrations. Cu doping in TiO2 nanoparticles led to a decrease in the band gap energy, resulting in increased light absorption in the UV-VIS range and lower recombination rates of photoinduced electron-hole pairs, which enhanced the photocatalytic activity. Cu surface doping in TiO2 was also found to broaden the photo-response range and improve the photoelectric response rate, leading to higher apparent quantum efficiencies for hydrogen production. Cu doping on TiO2 surfaces with defects further enhanced the photocatalytic properties, resulting in rapid inactivation of bacteria species under solar lamp irradiation. Overall, Cu impurities in TiO2 have been shown to enhance its photocatalytic activity, making it a promising material for various environmental applications.
How is the rate of reaction affected by various concentrations of acid?5 answersThe rate of reaction is affected by various concentrations of acid. In concentrated aqueous acids, the reaction rate varies with the "excess acidity" of the medium, rather than Hammett-type acidity functions or water activity. In the case of dilute hydrochloric acid added to excess marble chips, the mass of reactants decreases over time. In the context of carbonate reservoir stimulation, the reaction rate between acidizing fluid and rock matrix is a key parameter. Dolomite-rich formations exhibit slower reaction kinetics compared to calcite, affecting the success of stimulation treatments. To boost the dolomite dissolution rate, sulfonate-based surfactants can be added to hydrochloric acid, accelerating the reaction rate. Similarly, an acid-resistant Gemini zwitterionic viscoelastic surfactant can be used to retard the acid-rock reaction rate, enhancing acidification.
Explain about catalyst in factors affecting rates of reactions?3 answersA catalyst is a substance that can change the rate of a chemical reaction without being permanently altered itself. It affects the reaction rate by providing a different mechanism with a lower activation energy, thus increasing the rate of the reaction. Catalysts do not change the thermodynamics of the reaction or the position of equilibrium, but they can help the reaction reach equilibrium more quickly. Catalysts can be classified as homogeneous or heterogeneous, depending on whether they are in the same phase as the reactants and products or in a separate phase. Homogeneous catalysts can lead to significant rate enhancements but may require a separation operation for catalyst recovery. Heterogeneous catalysts, on the other hand, do not have major separation problems but can be affected by mass-transfer limitations. Overall, catalysts play a crucial role in affecting the rates of reactions by providing alternative reaction pathways with lower activation energies.