FTIR shift

Functional

Reference

617.83

C-H stretching

(Makawa, 2016) [11]

670

869.64

FeFeOH

(Goodman et al., 1976) [12]

1114.74

SiO-Si stretching band

(Moenke, 1974) [13]

1400.71

Na₂CO₃

(Reig, et al., 2002) [14]

1622.25

stretching vibrations of −C=N

(Zheng, 2015) [15]