Thermodynamic Studies of the Arsenic Adsorption on Iron Species Generated by Electrocoagulation

Table 7

FT-IR vibrations and their corresponding wavenumbers and region for the bands observed for the EC-by product.

Electrode material	Type of vibrations	Vibration wavenumbers (cm^−1)	Vibration range (cm^−1)
Iron	OH stretching	3738	3689–3787
		3447	3550–3000
	Hydroxyl bending	1637	1572–1813
	𝛾^′(OH) water bending	1637	1572–1813
	Overtones of hydroxyl bending	1637	1572–1813
	Magnetite (Fe3O4 or Fe3-xO4)	575	526–840
	Fe-O	469	416–510
	Lepidocrocite	1120	1090–1245
		1023	923–1057
		745	730–90