Spectroscopic Analysis of Heterogeneous Biocatalysts for Biodiesel Production from Expired Sunflower Cooking Oil

Table 2

Wave numbers of FTIR spectra and associated bonds for untreated saw dust (A), carbonized saw dust (B), and carbonized + sulphonated saw dust (C).

Wave number; A	Group attributed	Wave number; B	Group attributed	Wave number; C	Group attributed
3338	O–H	3366	O–H	1555	C=C
2883	C–H	1594	C=C	1397	S=O
1727	C=O	1208	C–O	1155
1596	C=C	1106	C–O
1233	C=C	1028	C–O
1032	C–O
559	C–C