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Bioresources and Bioprocessing
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Table 2 FTIR analysis of the raw and modified biomas before and after biosorption

From: Bioremediation of Cu(II) contaminated water by Saccharum officinarum: effect of oxalic acid modification on equilibrium, kinetic and thermodynamic parameters

Functional group RAWB OAMB Cu-RAWB Cu-OAMB
Hydroxyl group 3398–3024 3699–3003 3676–2993 3673–3040
–CH-stretching 2903 2899 2928 2932
Carbonyl stress 1732 1705 1713 1711
Aromatic skeletal vibrations C–O stretching in Lignin 1637 1637 1599 1605
Aromatic skeletal vibrations C–O stretching in Lignin 1601 1603   
Aromatic skeletal vibrations C–O stretching in Lignin 1512 1510   
Aromatic skeletal vibrations C–O stretching in Lignin 1425 1423   1423
–CH-streching 1371 1367 1373 1367
Ring breathings 1325 1319   
Ring breathings 1248 1267   1231
Ester group   1198   
Ester group 1163 1161 1163 1165
Ester group   1105   
CH-streching Hemicellulose   1051 1053 1061
l-Glucosidic linkages   897 891  
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