Studies of Adsorption of Heavy Metals onto Spent Coffee Ground: Equilibrium, Regeneration, and Dynamic Performance in a Fixed-Bed Column

Table 1

Maximum adsorption capacities of heavy metals onto various adsorbents reported in literature.

Adsorbent	(mmol/g)			pH	Ref.
	Cd^2+	Cu^2+	Pb^2+
Amberlite IR-120	0.90	0.34	0.41	NR	[26]
Dowex 50 W	0.25	0.35	0.23	8	[19]
Powdered activated carbon	0.10	0.52	0.17	7	[27]
Granular activated carbon	0.03	0.08	0.08	5	[18]
Tea waste	—	0.75	0.31	NR	[28]
SCG	0.12	0.21	0.32	4.5	This work
Olive stone waste	0.15	0.09	0.14	5	[29]
Coffee ground	0.10	0.03	0.24	5	[30]

NR: not reported.