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

Bioresources and Bioprocessing

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

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