Study On Several Typical Organic Pollutants By Two-dimensional Correlation Analysis

Dibutyl Phthalate?DBP?and Methyl Orange?MO?are two typical organic pollutants.Among them,DBP is a plasticizer,which is easy to migrate in white wine and edible oil,causing harm to human body;MO is a kind of azo dye,which is seriously polluted by water,soil and other environments,indirectly The human body causes damage.Therefore,the study of typical organic pollutants is of great significance.In this paper,the spectral detection of DBP and MO was carried out by using Fourier transform infrared spectroscopy,Raman spectroscopy and two-dimensional correlation spectroscopy.The main research contents are as follows:1. Fourier transform infrared spectroscopy?FTIR?of DBP/absolute ethanol and DBP/sunflower oil mixtures was detected.It was found that in DBP/absolute ethanol mixtures,group C-O-C stretching vibration,=CH bending vibration,C=O stretching vibration and CH₃ antisymmetric stretching vibration were sensitive to DBP concentration change,benzene ring skeleton vibration remained stable,and overlapping peak 1090cm^-1 was also distinguished.In the DBP/sunflower oil system,with the increase of DBP concentration,the changes of functional groups directly connected with benzene ring are not sensitive.The C=O bond of saturated carboxylic esters in sunflower oil is sensitive to the change of stretching vibration.The stretching motion of C-H bond in methyl is more obvious than that in methylene,and overlapping peaks are also distinguished.2. Raman spectra of MO were simulated and compared with the measured spectra.The ultraviolet-visible absorption spectra and Raman spectra of MO degradation intermediates were measured by using P25 photocatalyst.The order of photocatalytic degradation of MO was Ph₁-N=,=N-Ph₂?C-C single bond;C-N bond took precedence over molecule group-C=C-?-N=N-??C-?SO₂?-O?;-N=N-bond took precedence over molecule group Ph-N bond;-C=C-and-C-C-bond in benzene ring lag behind the breakage of-N=N-bonds.The results show that the combination of Fourier transform infrared spectroscopy and Raman spectroscopy with two-dimensional correlation spectroscopy provides a new idea and method for the study of the migration of plasticizers in food and the photocatalytic degradation of organic pollutants.