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Table 2

FTIR band assignments of raw and activated kola nut husks and their differences

Wave numbers (cm−1)
IR peaksKNHRKNHADifferencesBand assignments
3,772.76 3,772.76  0.00  O-H stretch of alcohol 
3,433.29 3,427.51  5.53  O-H bond of carboxyl 
2,382.09 2,370.51  11.58  C≡N vibration of nitriles 
1,855.52 1,855.52  0.00  C=O stretch of acid halide 
1,789.94 1,789.94  0.00  C=O of acid halides 
1,639.49 1,699.29 −59.72  C=C stretch of alkenes 
1,413.82 1,384.89  28.93  C=S stretch of thioamides 
1,278.81 1,253.73  25.10  C=S stretch of thioamides 
1,107.14 1,093.64  13.50  C-O stretch of esters 
10 678.94 696.30 −17.36  C-H deformation of disubstituted alkenes 
Wave numbers (cm−1)
IR peaksKNHRKNHADifferencesBand assignments
3,772.76 3,772.76  0.00  O-H stretch of alcohol 
3,433.29 3,427.51  5.53  O-H bond of carboxyl 
2,382.09 2,370.51  11.58  C≡N vibration of nitriles 
1,855.52 1,855.52  0.00  C=O stretch of acid halide 
1,789.94 1,789.94  0.00  C=O of acid halides 
1,639.49 1,699.29 −59.72  C=C stretch of alkenes 
1,413.82 1,384.89  28.93  C=S stretch of thioamides 
1,278.81 1,253.73  25.10  C=S stretch of thioamides 
1,107.14 1,093.64  13.50  C-O stretch of esters 
10 678.94 696.30 −17.36  C-H deformation of disubstituted alkenes 
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