Waste Foundry Sand as Permeable and Low Permeable Barrier for Restriction of the Propagation of Lead and Nickel Ions in Groundwater

Table 3

Functional groups responsible for Pb⁺² and Ni⁺² sorption onto WFS.

Metal	Wavenumber (cm^−1)	Functional group
Lead	3619	O-H band
	1668	H-O-H
	1100	C-O
	662	O-Si-O
	522	Si-O band
Nickel	3654	O-H band
	1613	H-O-H
	1123	C-O and O-H band
	681	O-Si-O