Nickel Removal from Aqueous Solution Using Chemically Treated Mahogany Sawdust as Biosorbent

Table 1

The FTIR spectral characteristics of sawdust before and after adsorption of nickel ions.

Wavenumber (cm^−1)			Assignments
Before adsorption	After adsorption	Differences
3437	3410	−27	O-H stretching
2924	2916	−8	C-H stretching
1737	1737	0	C-H bending
1635	1631	−4	C=C stretching
1510	1504	−6	N-O stretching
1462	1462	0	C-H bending
1423	1425	+2	O-H bending
1373	1375	+2	O-H bending
1321	1330	+9	S=O stretching
1247	1247	0	C-O stretching
1161	1161	0	C-O stretching
1120	Nil	Absent	C-O stretching
1056	1056	0	S=O stretching
900	898	−2	C-H bending