Novel nanocomposite thin films for efficient degradation of Rhodamine B and Rhodamine 6G under visible light irradiation: Reaction Mechanism and Pathway studies

Abstract

The present investigation aims to synthesize the novel nanocomposite thin film and utilize the material to remove emerging dyes efficiently (i.e., Rhodamine B (R-B) and Rhodamine 6G (R-6G)), in an aqueous solution using LED visible light and UV-A light. A facile synthetic route was adopted to obtain the TiO2-supported bentonite and <i>in situ</i> decorated with Au nanoparticles (NPs) thin film. The advanced analytical techniques characterizes the materials. The laboratory scale reactor was utilized for efficient degradation of R-B and R-6G using thin film catalysts. The percentage removal of R-B was 54.13% (visible light) and 76.26% (UV-A light) and the R-6G, was removed 60.37% (visible light) and 84.68% (UV-A light) at the initial pollutant concentration of 0.5 mg/L and at pH 6.0 using the thin film photocatalyst. The parametric studies demonstrated the insights of degradation mechanisms in photocatalytic operations. A significant mineralization of these dyes is achieved, and the repeated use in reactor operations indicated the catalysts

Exploiting Laser‐Induced Oxidation Phase Diagrams for Multifunctional Titania Thin Films

“…The difference in trends to the nitrogen oxide degradation emphasizes the impact of competing effects of the extended photocarrier lifetime and the increased work function on the photocatalytic performance. While dye degradation proceeds through hole-mediated reaction pathways [65][66][67] that are far from the Fermi level and are robust to work function changes, NO x degradation heavily relies on the formation of superoxide (O 2 − ) radicals via electronmediated reaction pathways [17] which are suppressed by the Fermi level lowering. [68][69][70][71] These observations demonstrate the unprecedented potential of our synthesis approach to tailor titania films for specific applications.…”

Constructing a Z-Scheme Co3O4/BiOBr Heterojunction to Enhance Photocatalytic Peroxydisulfate Oxidation of High-Concentration Rhodamine B: Mechanism, Degradation Pathways, and Toxicological Evaluations

“…Rhodamine B (RhB) is an extensively utilized xanthene dye, characterized by high carcinogenicity, mutagenicity, neurotoxicity, and chromaticity. As the annual consumption of RhB increases enormously, the environmental and health issues possibly caused by this dye are becoming more and more serious. , To eliminate the harmful impacts on the ecosystem, it is mandatory to completely remove RhB from the wastewater prior to discharge . In recent decades, physical, chemical, and biological methods have been developed for the treatment of dye-containing wastewater .…”