Optimization of the Fabrication of Sustainable Ceramsite Adsorbent from Coal Fly Ash/Waterworks Sludge/Waste Glass for Decolorization of Malachite Green

Table 4

The assignment of absorption bands in FT-IR spectra and signs of each cross peak in the synchronous (Ф) and asynchronous (Ψ) maps.

Position (cm^-1)	Assignment	Sign
		3422	2922	1619	1384	1032	669
3422	νO-H (crystal water)	+	+(-)	+(+)	+(+)	+(-)	+(-)
2922/2852	νC-H (-CH3/-R2 CH2)		+	+(+)	+(+)	+(-)	+(+)
1619	νCOO- (carboxylate)			+	+(+)	+(-)	+(+)
1384	δC-H (aliphatics)				+	+(-)	+(-)
1032	νC-O-O or νC-O (carbohydrates)					+	+(+)
669	CO3^2-						+

Signs were obtained in the maps of 2D-COS map: + positive and - negative.