AI Article Synopsis
- The study explores the photocatalytic degradation of a specific azo pyridone dye using TiO(2) in simulated sunlight, revealing that the reaction follows pseudo first-order kinetics per the Langmuir-Hinshelwood model.
- Various parameters, such as optimal catalyst amount and pH, were evaluated, showing that increasing initial dye concentration decreases the reaction rate, while hydrogen peroxide enhances degradation and ethanol inhibits it.
- Total organic carbon (TOC) analysis indicated that even with complete dye decolorization, 54% of TOC remained, suggesting the presence of degradation intermediates, and the study further examined dyehouse effluents containing this dye and its auxiliary chemicals.
Article Abstract
Photocatalytic degradation of synthesized azo pyridone dye (5-(4-sulpho phenylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridone), in aqueous solutions by simulated sunlight in the presence of commercial TiO(2), Aeroxide P25, was studied. The reaction kinetics analysis showed that photodegradation exhibits pseudo first-order kinetics according to Langmuir-Hinshelwood model. The effects of various process parameters on the photocatalytic degradation were investigated. The optimal catalyst content and pH were determined. A decrease in the reaction rate was observed upon the increase of the initial dye concentration. Degradation of the dye was enhanced by hydrogen peroxide, but it was inhibited by ethanol. The influence of temperature was studied, and the energy of activation was determined. According to total organic carbon (TOC) analysis, 54% of TOC remained when 100% of the dye was decolorized. Although the intermediates were not determined in this study, the TOC results clearly indicate their presence during the reaction. In addition, photocatalytic degradation of simulated dyehouse effluents, containing tested azo pyridone dye and associated auxiliary chemicals was investigated.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/10934529.2011.526905 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Live Cell Imaging Studies on Orange Emitting Thiazole-Pyridone Azo Fluorophore and Its Latent Fingerprints, Computational, Electrochemical Sensing for Dopamine Detection.
Luminescence
October 2024
Department of Studies in Chemistry, Davangere University, Davangere, Karnataka, India.
The fluorescent materials have sparked a lot of research interests due to their unique electronic, optical and chemical characteristics. Here, we are intended to present a simple and facile synthesis of novel orange emitting thiazole-pyridone fluorescent tag (TPFT) by a simple diazo coupling reaction and the structural elucidation was carried out by IR, NMR (H and C), UV-Vis, photoluminescence and HR-MS spectrometry. The solvatochromic behaviour of the TPFT offered crucial information about the formation of hydrazone and azo tautomeric forms.
View Article and Find Full Text PDFHydrazo Pyrazole-Pyridone Fluorescent tag for NLO, Live cell imaging, LFPs visualization, Photophysical probing, and Electrochemical sensor for Dopamine detection.
Luminescence
May 2024
Supramolecular and Organometallic Chemistry Laboratory, Department of Inorganic Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, India.
The present communication reports on the synthesis of a novel methyl-pyridone azo fluorescent tag (MPAFT) were proven through H (NMR), FT-IR, UV-vis, and high-resolution mass spectrometry. The quantum chemical parameters of MPAFT were evaluated using density functional theory (DFT) analysis. It was further investigated for its latent fingerprint (LFPs) in various surfaces and anticounterfeiting applications.
View Article and Find Full Text PDFNovel Yellow Azo Pyridone Derivatives with Different Halide Atoms for Image-Sensor Color Filters.
Molecules
October 2022
Integrated Engineering, Department of Chemical Engineering, Kyung Hee University, Yongin 17104, Korea.
Novel yellow azo pyridone dye derivatives were synthesized for use in image-sensor color filters. The synthesized compounds have a basic chemical structure composed of azo, hydroxy, amide, and nitrile groups as well as different halide groups. New materials were evaluated on the basis of their optical, thermal, and surface properties under conditions mimicking those of a commercial device fabrication process.
View Article and Find Full Text PDFImprovement of theoretical UV-Vis spectra calculations by empirical solvatochromic parameters: Case study of 5-arylazo-3-cyano-1-ethyl-6-hydroxy-4-methyl-2-pyridones.
Spectrochim Acta A Mol Biomol Spectrosc
May 2022
Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia.
In order to improve the performance of theoretical UV-Vis spectra predictions, a theoretical and experimental study of solvatochromic properties of ten azo pyridone dyes has been performed. For quantitative estimation of intermolecular solvent-solute interactions, a concept of the linear solvation energy relationships has been applied using Kamlet-Taft and Catalán models. Theoretical UV-Vis spectra for all dyes have been calculated using four TD-DFT methods in nine different solvents with the aim to define the most reliable model.
View Article and Find Full Text PDFEffect of substituents in hydroxyl radical-mediated degradation of azo pyridone dyes: Theoretical approaches on the reaction mechanism.
J Environ Sci (China)
December 2020
Institute of Chemistry, Technology and Metallurgy, University of Belgrade (National Institute), Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Republic of Serbia.
Understanding the degradation behavior of azo dyes in photocatalytic wastewater treatment is of fundamental and practical importance for their application in textile-processing and other coloration industries. In this study, quantum chemistry, as density functional theory, was used to elucidate different degradation pathways of azo pyridone dyes in a hydroxyl radical (HO)-initiated photocatalytic system. A series of substituted azo pyridone dyes were synthesized by changing the substituent group in the para position of the benzene moiety, ranging from strong electron-donating to strong electron-withdrawing groups.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!