IR peak frequency (cm−1) | Assignment | H-C-H symmetric and asymmetric stretching (alkane) | C=N stretching (oxime) | N=O stretching (nitro group) | C-H in plane bending (alkane) | N=O bending (nitro group) | C-O stretching (ester or ether) | ||
Okra leaves loaded with Cr(VI) | 2913.05 | 2843.59 | 1593.19 | - | 1405.22 | - | 1229.51 | 1004.77 | |
Plain okra leaves for the sorption of Cr(VI) | 2921.23 | 2855.85 | 1621.79 | 1527.18 | - | 1388.44 | 1233.60 | 1025.20 | |
Assignment | O-H stretching | C-H stretching (alkane) | C=N stretching (oxime) | O-H bending (carboxylic acid) | N=O bending (nitro group) | C-O stretching (carboxylic acid) | - | ||
Okra leaves loaded with Cr(III) | 3280.82 | 2917.14 | 2851.76 | 1605.45 | 1421.57 | 1315.32 | 1229.51 | - | |
Plain okra leaves for sorption of Cr(III) | 3260.39 | 2933.48 | 2839.50 | 1613.62 | 1417.48 | 1311.24 | 1233.60 | - |