Improved permeate flux and rejection of ultrafiltration membranes prepared from polyethylene terephthalate (PET) bottle waste

Table 2 Interpretation of FTIR spectra of membranes from PET bottle and PET resin

No	Wavenumber (cm⁻¹)	Functional group	References
1	3054	C-H bond of the phenyl ring	[20]
2	2968–2969	C-H bond of the ethyl group	[20]
3	2907	C=O bond of the ester group	[21]
4	1742–1743	C=O bond of the ester group	[21]
5	1578–1579	C-H bond of the phenyl ring	[20]
6	1504–1505	C=C bond of the phenyl ring	[21]
7	1413–1415	C-C bond of the phenyl ring	[20]
8	1140–1142	C-O bond of the ester group	[20]
9	1024–1025	C-O bond of the ester group	[21]
10	737–738	C-H bond of the ethyl group	[20]

ISSN: 2468-2039