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The study aimed to evaluate the photocatalytic efficiency of Cu-doped TiO2 nanoparticles synthesized via the sol-gel method, particularly in the degradation of Alizarin Red S dye under various light sources, including UVA LED and sunlight irradiation. Cu-doped TiO2 nanoparticles were synthesized using a sol-gel method, followed by rigorous characterization using XRD, SEM, TEM, EDX, and UV-Vis DRS techniques to confirm their structural and optical properties. The photocatalytic efficiency was evaluated by observing the breakdown of Alizarin Red S dye under various lighting conditions, and the rate of the breakdown was analyzed using a pseudo-first-order kinetic model. The study revealed that Cu-doped TiO2 exhibited enhanced photocatalytic activity, particularly under UV light, achieving an 87.11% degradation of Alizarin Red S dye within 60 minutes. Under sunlight, the degradation efficiency was 73.02%, while under visible light, it was 56.19%. The introduction of copper into the TiO2 matrix effectively reduced the bandgap energy, thus improving the material's responsiveness to visible light. In conclusion, Cu-doped TiO2 nanoparticles significantly enhance the photocatalytic degradation of Alizarin Red S dye, particularly under UV light. The reduction in bandgap energy due to copper doping improves the material's responsiveness to visible light, making it a promising candidate for wastewater treatment applications. [ABSTRACT FROM AUTHOR]

Titania-supported Au-Pt nanoparticles have been prepared by the photo-deposition method employing platinum and gold particles on the titanium dioxide surface. The properties of the developed photocatalysts were characterized by two methods, such as UV-visible diffuse spectrophotometry (UV-Vis) and transmission electron microscopy (TEM). When loaded with gold and platinum particles, titanium dioxide's (TiO2) photocatalytic activity significantly improved. This beneficial effect was attributed to an augmentation in the segregation of the electron-hole charge carriers generated by the photons. The kinetic and thermodynamic parameters were carried out, and they followed the Langmuir-Hinshelwood (L-H) mechanism. The amount of photo-induced hydrogen fabrication was studied, which depended on the sacrificial agent's concentration. It was found that the constant rate tends to increase as the concentration of ethanol increases. At 100 percent ethanol, there is a departure from the trend due to a change in the reaction mechanism. It was also observed that the rate increased with temperature. The different thermodynamic parameters like enthalpy of activation (H#), activation energy (Ea), entropy of activation (S#), and Gibb's free energy of activation (G#) were estimated for the reaction. Net energy recovery (NER) is a critical criterion for assessing the viability of conducting a photocatalytic process. Additionally, the current investigation revealed that the system containing 80% ethanol exhibited the greatest NER value. [ABSTRACT FROM AUTHOR]

Titania-supported Au-Pt nanoparticles have been prepared by the photo-deposition method employing platinum and gold particles on the titanium dioxide surface. The properties of the developed photocatalysts were characterized by two methods, such as UV-visible diffuse spectrophotometry (UV-Vis) and transmission electron microscopy (TEM). When loaded with gold and platinum particles, titanium dioxide's (TiO2) photocatalytic activity significantly improved. This beneficial effect was attributed to an augmentation in the segregation of the electron-hole charge carriers generated by the photons. The kinetic and thermodynamic parameters were carried out, and they followed the Langmuir-Hinshelwood (L-H) mechanism. The amount of photo-induced hydrogen fabrication was studied, which depended on the sacrificial agent's concentration. It was found that the constant rate tends to increase as the concentration of ethanol increases. At 100 percent ethanol, there is a departure from the trend due to a change in the reaction mechanism. It was also observed that the rate increased with temperature. The different thermodynamic parameters like enthalpy of activation (H#), activation energy (Ea), entropy of activation (S#), and Gibb's free energy of activation (G#) were estimated for the reaction. Net energy recovery (NER) is a critical criterion for assessing the viability of conducting a photocatalytic process. Additionally, the current investigation revealed that the system containing 80% ethanol exhibited the greatest NER value. [ABSTRACT FROM AUTHOR]