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Simultaneously by the two spectroscopic techniques and theĬ. Information, it is fast and it is very suitable for identifying unstableĪliquots collected at different reaction times were analyzed The sample to be treated, it gives qualitative and quantitative It is a nondestructive technique, it does not require Significant advantages over the techniques that are habitually Which was obtained from UV–vis-DAD because it has some H-NMR spectroscopy was selected to complement the data Mentioned as for information on the presence of intermediate The developed strategy constitutes a relatively fast methodology, useful both to monitor the degradation of the three dyes In each order (concentration and spectra) for each component that Obtained during the degradation process, it is recovered a profile When MCR-ALS is applied to data matrices formed by the spectra Multivariate curve resolution-alternating least squares (MCR-ALS). Resonance (1H-NMR) – and interpreted by multiset analysis by In the present study the photodegradation process was monitored simultaneously with two spectroscopic techniques – ultraviolet–visible diode array (UV–vis-DAD) and 1H-nuclear magnetic Recorded during the photodegradation of Acid Orange 61, Acid Redĩ7 and Acid Brown 425 to perform a kinetic study in order toĮstablish the optimal conditions in which this process should be Least squares (MCR-ALS) analysis of the UV–vis-DAD data that was Our research group used multivariate curve resolution-alternating Kinetic aspects and the type of intermediate formed. Have proved to be very useful for extracting information about Obtained from spectroscopically monitoring degradation process Methodologies based on the chemometric analysis of the data Usually used to monitor the effectiveness of degradation whileĬhromatographic-mass spectrometry techniques are commonly Spectroscopic techniques such as UV–visible spectroscopy are Photodegradation intermediates need to be assessed. Which the azo-compounds are degraded and the absence of toxic So, to control the wastewater toxicity, both the effectiveness with The initial step in the photodegradation ofĪn azo-compound usually involves a reductive cleavage of the azobond, which leads to the formation of toxic aromatic amines. The removal of pollutants from wastewater is a major environmental problem that is being addressed by a variety of disciplines.Īzo-dyes are a group of pollutants that require particular attentionīecause they are used in numerous areas and are highly toxic toĪlthough many methods have been used to remove organicĬontaminants from the wastewater of the textile and dye industries, advanced oxidation processes such as photodegradation are H-NMR spectroscopy data fusion in this field and illustrates its potential as a quick method forĮvaluating the evolution of the azo-dye photodegradation process. This study is the first application of UV–vis-DAD and When the three azo-dyes had practically degraded. It was concluded that three degradation products were present in the medium H-NMR signal before the multivariate analysis provides better results than when only one of the twoĭetector signals was used. The analysis of the H-NMR data suggests there are more intermediateĬompounds than those obtained with the UV–vis-DAD data. (MCR-ALS) was applied to obtain the concentration and spectral profile of the chemical compounds Multivariate curve resolution-alternating least squares Monitored simultaneously by ultraviolet–visible spectroscopy with diode array detector (UV–vis-DAD)Īnd 1H-nuclear magnetic resonance (1H-NMR). The photodegradation process of three azo-dyes – Acid Orange 61, Acid Red 97 and Acid Brown 425 – was
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Soledad Larrechiĭepartment of Analytical and Organic Chemistry, Rovira i Virgili University, C/Marcel lí Domingo, s/n, Campus Sescelades, E-43007 Tarragona, Spain The photodegradation process of azo-dyes using MCR-ALSĬristina Fernández, M. Journal homepage: UV–visible-DAD and 1H-NMR spectroscopy data fusion for studying Contents lists available at ScienceDirect