I've extracted dyes from the post-consumer PET fabrics, now I would like to characterise the extracted dyes and find out what exact dyes they are.
I've done FTIR and NMR (proton) but it is very difficult to confirm the dye names and types from these analysis.
I really appreciate if someone can suggest any other analysis to find out the dyes name.
Thanks
Raj
It is not an easy task, but HPLC or GC-Mass can help to characterize the extracted dye.
Dear Rajendran,
Standard spectral analysis techniques for visual and infrared light absorption are only accurate if you can verify that only one dye is present. It is however relatively easy to identify the presence of multiple dyes using Beer Lambert law three dimensional recipe prediction. Thus, to identify unknown PET dyes you would in principle develop and maintain a data base of spectral absorption versus dye concentration profiles for all the main PET dyes that might be present. You then select likely candidate members and use precise prediction of spectral profiles by Beer Lambert optical density analysis to verify their presence.
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