Application of Wasted Oolong Tea as a Biosorbent for the Adsorption of Methylene Blue

Table 1

The main functional groups of wasted oolong tea powder.

Fresh tea powder	Assignment
3416	Bonded –OH groups
2925	Aliphatic C-H group
2856	Asymmetric –CH2 vibration
1651	C=O stretching, aromatic C=C, C=O
1527	Secondary amine II group
1455	C-H alkanes in aromatic rings
1384	C-H bending, -CH3 symmetric bending of CH3
1238	-SO3 stretching or bonded C-N
1150	C-O-C of polysaccharides
1062	C-O-H stretching act