Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

Table 1

Adsorption kinetic fitting results for the MB adsorption onto tea stem powder. (C = 300 mg/L; RM = 4 g/L; pH = 5.00).

Temperature (K)	Qexp (mg/g)	Pseudo-first-order model			Pseudo-second-order model			Elovich model			Bangham model			Intraparticle diffusion model
		k1 (1/min)	R^2	Qcal (mg/g)	k2 (1/min)	R^2	Qcal (mg/g)	α	β	R^2	α	k3	R^2	Kid (first stage)	C	R^2	Kid (second stage)	C	R^2	Kid (third stage)	C	R^2
298	69.80	0.04	0.84	3.22	0.07	1.00	69.93	1.05 ∗ 10^21	0.75	0.95	0.08	0.02	0.96	39.36	7.13	0.85	0.89	64.58	0.98	0.01	69.59	0.97
313	69.78	0.04	0.84	6.45	0.04	1.00	69.44	3.51 ∗ 10^16	0.61	0.93	0.09	0.02	0.96	38.72	6.53	0.86	1.14	62.76	0.99	0.09	67.89	0.88
328	68.91	0.03	0.49	1.98	0.21	1.00	68.49	4.66 ∗ 10^21	1.98	0.72	0.07	0.02	0.76	39.45	6.42	0.87	1.62	63.11	1.00	0.11	67.88	0.90