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Table 4 FTIR spectra characteristics of Eichhornia crassipes before and after adsorption

From: Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

FTIR Peak

Assigned functional group

Band wavenumber (cm−1)

Before adsorption

After adsorption

Shift difference

1

(O–H) Hydroxyl

3235.76

3365.18

129.42

2

(C–H) Methyl

2921.22

0

2921.22

3

(C = C) Alkene and aromatic

1620.54

1609.23

11.31

4

(C–O) Phenolic

1318.44

1405.56

87.12

5

Alkyl ketone

1026.76

1040.25

13.49

6

(C–Cl) Chloride

773.11

873.08

99.97

7

(R-X) Alkyl halides

512.18

476.08

36.1

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BMC Chemistry

ISSN: 2661-801X

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