Use of Forestry Wastes for Biosorption of Dyes and Cr (VI)

Table 2

The main atomic groups and structures of adsorbents.

Wavenumber (cm^−1)	Infrared absorption and structures	PC	PC-N	OC	OC-N
1021–1023	C–O deformation	+	+	+	+
1217–1229	C–O stretching (phenols)	+	+	+	+
1366	C–H bending (methyl group)	+	+	+	+
1736–1738	C=O stretching (esters)	+	−	+	+
1718	C=O stretching (carboxylic acid)	−	+	−	−
2920–2925	C–H stretching (aliphatic structures)	+	+	+	+
3312–3335	–OH (phenols, alcohols, and carboxylic acids)	+	+	+	+