Table 3 Wave number of dominant peaks obtained from FTIR transmission spectra of the three biosorbents (O: O. mykiss scales; R: R. kutum scales; C: C. glaucum shells) before (B) and after (A) Pb adsorption.

From: Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors

Biosorbent

Wave number (cm−1)

Corresponding functional groups

B

A

C

854.814

856.134

CO32–

1082.454

1082.789

C–O

1445.946

1449.595

CH2 , CH3

O

1785.548

1786.826

C=O

690.573

–

Alkanes

869.763

–

Sulfonates

1000.891

1012.951

C–O

1265.504

1242.017

C–N

1420.036

1418.561

CH2, CH3

1647.368

–

C–C

2919.036

2925.253

C–H

3362.915

–

OH, NH2

685.885

668.668

Alkanes

873.156

701.887, 724.624, 776.459, 848.946, 880.824,

Sulfonates

999.177

945.645

C–O

R

1262.292

1041.086, 1118.305, 1169.983, 1218.037

C–N

1418.948

1418.502

CH2, CH3

1559.329

1464.911

N=O

1653.375

1623.775, 1653.452

C–C

2925.660

2919.623

C–H

3502.807

3118.249

O–H, NH2

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