Table 3: FTIR spectra of PAAm, PHA, and metal loaded PHA.

Original groupsAbsorption bands of original groups (cm−1)Experimental absorption bands (cm−1)
PAAmPHAPHA-M

Amide:
Free > NH stretching (amide II)3500, 3400340134443449
> C=O stretching (amide I)1650164916701649

Aliphatic:
–CH2 stretching2926–28532998, 28512919
–CH2 bending1485–144514001418
–CH3 bending1470–1430

Hydroxyl:
Free OH stretching3650–3590
Bonded OH3400–320032003449

Amine:
C–N stretching1410140014001416
NH stretching3000–2700

Chelate compounds3200–24402919
Metal–O bond<1000775