It has been mentioned in a few papers that from IR spectra, the mechanism of heavy metal sorption to the sorbent i.e. if chemisorption can be determined. But on what criteria is the confirmation done?
Thank you
you can compare the wave number for pure metal and the wave number of metals with adsorbed for example:-
IR spectra of the free metal salts and those adsorbed on AC surfaces supported adsorption of the metal cations on the surface; this was reflected in the shifts in wave numbers from 825 to 879.5 cm-1 for cadmium ions after adsorption with activated carbon; . Therefore, the results of the present investigation revealed that after adsorption on activated carbon, there was an increasing shift
for cadmium then nickel (54.5 cm-1 ).
These shifts indicated that there were binding processes taking place on the surface of activated carbon, and the greater the shift the stronger the bond between the activated carbon and the adsorbed metal .
you can find this in the article below :
https://www.researchgate.net/publication/264198547_Heavy_Metals_Removal_Using_Activated_Carbon_Silica_and_Silica_Activated_Carbon_Composite
all the best
Article Heavy Metals Removal Using Activated Carbon, Silica and Sili...
I support the view of Dr. Hassan. A similar shift also occurs in wave number of function groups of adsorbent.
you can compare the IR of the adsorbent and the adsorbent after absorb the metal . thus there are some function group well disappear that which attached with the metal
I
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