Competitive Fixed-Bed Adsorption of Pb(II), Cu(II), and Ni(II) from Aqueous Solution Using Chitosan-Coated Bentonite

Table 1

FTIR analysis of CCB (before and after adsorption).

IR peak	Wavenumber (cm^−1)			Assignment
	Before adsorption	After adsorption	Differences
1	3442	3451	+9	O-H stretching
2	3656	3662	+6	N-H stretching
3	1638	1638	0	C=O stretching
4	1383	1383	0	CH2= bending
5	1048	1056	+8	Si-O-Si stretching
6	920	920	0	Al-OH stretching
7	798	798	0	(Al, Mg)-OH stretching
8	526	526	0	Si-O-Al bending
9	466	473	+7	Si-O-Si bending