The FTIR spectrum of curcumin is given in Fig. 3(a). For cur-
cumin, the bands observed at 3510 cm−1, 1627 cm−1, 1504 cm−1,
1280 cm−1 and 1145 cm−1 are attributed to the phenolic OH
stretching, C O group, C C vibrations, aromatic C O stretch-
ing and C O C stretching modes, respectively. The FTIR spectrum
of CA nanofibrous membrane was shown in Fig. 3(b). The peak
absorbed at 1743 cm−1 was corresponding to C O stretching of
acetyl group. Absorption band at 1426 cm−1 was assigned to the
depicted in Fig. 3(c). From the spectrum, it can be clearly seen
that the predominant absorption peak was observed for CA and
not for curcumin. This shows that the polymer CA covers the cur-
cumin moiety. Similarly, after the detection of Pb2+ the CC-CA
nanofiber shows an absorption peak at 3307 cm−1 and 1643 cm−1
which corresponds to OH and C O groups of curcumin, respec-
tively (Fig. 3(d)). On comparing before and after interaction with
Pb2+, there was a shift in OH and C O groups from 3510 cm−1,
1627 cm−1 to 3307 cm−1, 1643 cm−1, respectively, which confirms
that OH and C O groups are involved in the formation of the
complex between curcumin and Pb2+. This complex formation may
be due to the direct bonding of curcumin moiety to the Pb2+ or
through the intermolecular hydrogen bonding [37].