Why is there no peak shift in FTIR-ATR after the amine-modified polystyrene nanoplastics (PS-NH2) adsorption onto the NIPAAM/CMC hydrogel materials? I have repeated the tests, but I have gotten the same results. After the adsorption, there might be some peak shifting for some functional groups. However, I have exactly the superimposable spectra before and after 95% PS-NH2 adsorption; only the peak intensity after adsorption is higher. What does it mean? I am expecting your help and support in this matter. Thank you in advance.
Adsorption is a physical processes therefore you didnt get any shifting in peak.
Ayaz Mahsud thank you very much for your answer. In my case, the main dominating factor is the ionic interaction between the -OH (on the adsorbent surface) and -NH2 (on the adsorbate surface). As per some references, after the adsorption, the shifting of the -OH peaks is there. However, in my case, I got exactly the superimposable peaks. Is there any chemistry behind these results? In my case, the adsorbent and adsorbate are both polymeric materials. The adsorption process follows pseudo-second-order kinetics and the Langmuir isotherm.
Commenting on spectra without seeing them is a very risky practice. However if we take your comments at face value then no shift means no physical nor chemical interaction.
Somen Mondal according to my knowledge FTIR stand for studying covalent interaction not for ionic.
The lack of peak shift in your FTIR-ATR spectra after high (95%) PS-NH2 adsorption onto the NIPAAM/CMC hydrogel is interesting and suggests a specific type of interaction.
Sheffin khan a S Thank you very much for your great explanation. Your answer gives some insight into the problem I am facing. However, I am still confused enough and trying hard to find more insight with some references. If you have any references in favor of your answer, please suggest them to me. It will greatly help me, and I will remain thankful to you.
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