Synthesis and Physicochemical Characterization of Anion Exchanger Based on Green Modified Bottle Gourd Shell

Table 5

Absorption IR bands assignation for the lignocellulosic LVS biomass and MLV precursor.

Band position (cm^−1)		Functional group	Vibration	Assignation
LVS	MLV			Cellulose	Hemicellulose	Lignin
3400	3400	O–H	Valence	•	∆	■
2921	2925	C–H	Valence	•	∆	■
2874	2870↓	C–H	Valence			■
2857	2858	C–H	Valence	•	∆	■
1738	1735↓	C=O	Valence		∆
^—	1650	C=O + C=C	Valence			■
1637	1635	H–O–H	Deformation	•
1601∗	1600↓	C=C aromatic	Valence			■
^—	1557	C=C aromatic	Skeletal			■
1510	1508	C=C aromatic	Skeletal			■
1460	1458	C–H	Deformation	•	∆	■
1425	1423	O–H	Deformation	•	∆	■
1376	1375	C–H aliphaic	Deformation	•	∆	■
^—	1336	C–H + O–H	Deformation	•	∆	■
1327	—	Ring + C–O	Deformation			Syringyl
^—	1320	CH2	Deformation	•	∆
1260	1260	C–H	Deformation	Crystalline
1162	1160	C–O–C	asym. Val.	•	∆
1106	1109	C–OH	Valence sec.	•	∆
1086	1086	C–OH	Deform. sec.	•	∆	■
1042	1049	C–O + C–C–O	Valence	•	∆	■
990	—	C–O	Valence	•
^—	960	H–C=C–H	Deformation			■
896	897	C–H	β-glycosid.	•	∆
830	814	C–H + C=C	Deformation		∆	■
<800	<800	C–H + O–H	Deformation	•	∆	■

Characteristic changes are emphasized by star and arrow.