Adsorption of Arsenate from Aqueous Solution onto Modified Vietnamese Bentonite

Table 3

Parameters of pseudo-first-order and pseudo-second-order kinetic model of As(V) adsorption by Fe-B and Al-B at different temperatures.

Adsorbent	T (K)	qe (experimental) (mg/g)	First-order kinetic model			Second-order kinetic model
			k1 (min^−1)	qe (cal) (mg/g)	R^2	k2 (g/mg·min)	qe (cal) (mg/g)	R^2
Fe-B	283	14.38	0.010	15.19	0.942	0.35 × 10^−3	21.14	0.924
	293	14.42	0.013	12.44	0.977	0.68 × 10^−3	19.80	0.973
	303	14.42	0.027	9.80	0.962	4.20 × 10^−3	15.53	0.999
	313	14.44	0.021	6.57	0.992	7.30 × 10^−3	14.97	0.998
Al-B	283	18.47	1.6 × 10^−3	16.35	0.956	1.0 × 10^−3	22.22	0.984
	293	20.75	1.9 × 10^−3	13.01	0.948	2.9 × 10^−3	22.22	0.998
	303	20.80	7.0 × 10^−3	8.56	0.949	4.2 × 10^−3	20.83	0.992
	313	21.05	9.0 × 10^−3	7.09	0.752	5.8 × 10^−3	21.28	0.996