Research Article
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 |
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