Hi everyone, i have work using paracetamol sample with electrochemical wastewater treatment under special conditions, then analyze with COD (Chemical Oxygen Demand) removal, UV and FTIR.
Analyze by the COD removal, the COD removal is high which were up to 70%. The UV spectra shows that the UV peak were reducing between control and treated. But, the FTIR spectra shows that the FTIR of control (untreated Paracetamol) in blue curve and that of treated in purple curve were same like there's no difference. Whereas, based on the COD removal and UV spectra there is a difference. Can anybody tell the reason why the FTIR curve like that? Is it okay if the curve of FTIR like that? "If the the absorbance of the uv peak were reduces, then the transmittance of the FTIR also reduces" is that statement true? The FTIR curve were confusing, so I need your help.
Thanks in advance...
The solution to this riddle is that the IR spectrum before and after treatment is that of water, you can't see any bands of paracetamol in it (and water has only a band in the UV spectrum below 210 nm). Most probably the concentration of paracetamol before the treatment is simply too low.
The FTIR analysis gives an idea of the groups in the matrix. The molecule may well be degraded into other smaller molecules but with the same groups that were initially adsorbed.
In UV the absorbance is that of the initial molecule for a given wavelength, and this value varies with the concentration of the molecule.
The FTIR analysis could be quantitative depending on the analysis method, otherwise the results are more qualitative.
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