Biosorption of Pb(II) Ions by Klebsiella sp. 3S1 Isolated from a Wastewater Treatment Plant: Kinetics and Mechanisms Studies

Table 5

IR absorption bands: changes and possible assignment.

FTIR peak	Original biomass wavenumbers (cm^−1)	Pb(II) loaded biomass wavenumbers (cm^−1)	Displacement (cm^−1)	Functional groups	Assignment
1	3282	3280	2	–OH, –NH	Stretching vibrations of amino and hydroxyl groups
2	2958	2957	1	–CH3	–CH3 asymmetric stretching
3; 4	2925; 2875	2924; 2875	1; 0	–CH2; –CH3	–CH2 asymmetric stretching vibrations; –CH3 symmetric stretching vibrations
5	2854	2853	1	–CH2	–CH3 asymmetric stretching vibrations
6	1638	1639	1	–CO, C–N	C=O and C–N stretching in amide I group
7	1531	1534	3	–CN, –NH	C–N stretching in amide II group and N–H bending
8	1453	1453	0	–CH2, –CO	–CH2 bending, symmetric C=O
9	1396	1398	2	–COO^−	–COO^− symmetric stretching of carboxyl groups
10	1233	1236	3	, –CO	P=O asymmetric stretching of phosphate groups, deformation vibration of C=O carboxylic acids
11; 12	1063	1058; 1038	5; 1038	, –OH; –CO,	P=O symmetric stretching of phosphate groups, –OH of polysaccharides; C–O stretching of alcoholic groups, symmetric stretching of phosphate groups
13		993	993	–C–O, –CH2	C–O–C, C–O–P, and –CH2 stretching vibrations of polysaccharides
14	967	969	2		N-containing bioligands
15	914	915	1		N-containing bioligands
16	860	861	1		S=O stretching
17	796	796	0		N-containing bioligands
18	780	780	0		N-containing bioligands
19		571	571		N-containing bioligands
20	515	539	24		N-containing bioligands