Study on the Oxidative Leaching of Uranium from the Lignite in the System

Table 2

Kinetic parameters for the leaching of uranium from the lignite.

Run	Experimental data		Pseudo-first-order kinetic				Pseudo-second-order kinetic
	Ce (mg·L^−1)	Qe (mg·kg^−1)	Q0 (mg·kg^−1)	k1 (h^−1)	Qe (mg·kg^−1)	r^2	Q0 (mg·kg^−1)	k2 (kg·mg^−1·h^−1)	Qe (mg·kg^−1)	r^2
(a)	3.76	27.00	97.77	0.40	27.32	0.988	100.65	0.0065	18.13	0.989
(b)	2.76	46.88	93.41	0.60	51.13	0.874	99.84	0.028	49.14	0.935
(c)	2.47	52.75	97.19	0.74	54.03	0.940	101.94	0.028	51.05	0.973
(d)	2.44	53.28	99.97	1.49	55.29	0.965	102.48	0.054	52.78	0.982
(e)	2.09	60.30	97.10	0.96	60.04	0.892	101.63	0.053	58.79	0.937
(f)	1.43	73.50	102.75	1.23	71.92	0.957	104.37	0.12	72.67	0.861