Competitive Fixed-Bed Adsorption of Pb(II), Cu(II), and Ni(II) from Aqueous Solution Using Chitosan-Coated Bentonite

Table 5

Model parameters of Adams-Bohart, Thomas, and Yoon-Nelson equation for the fixed-bed adsorption of Pb(II), Cu(II), and Ni(II) onto CCB at 25°C.

Column conditions				Adams-Bohart model				Thomas model					Yoon-Nelson model
Metal	(cm)	(mg/L)	(mL/min)	(mg/L)	×10^−4 (L/mg·min)		%	(mg/g)	(mg/g)	×10^−4; (L/mg·min)		%	(min)	(min)	×10^−2; (L/min)		%
Pb	1.0	100	0.4	4209.67	1.54	0.96	22.39	10.69	9.47	1.48	0.96	24.57	279.22	251.04	1.42	0.96	24.57
	2.0	100	0.4	4431.50	0.92	0.91	22.97	11.30	10.65	0.84	0.91	26.43	585.73	525.52	0.81	0.91	26.43
	3.0	100	0.4	4911.13	0.42	0.85	32.71	12.50	11.47	0.36	0.85	40.61	917.62	706.63	0.37	0.85	40.61
Cu	1.0	100	0.4	3377.24	1.76	0.97	13.72	8.56	8.10	1.71	0.97	14.44	221.07	207.51	1.66	0.97	14.44
	2.0	100	0.4	3695.78	0.95	0.87	22.49	9.29	8.70	0.83	0.87	25.67	480.61	424.49	0.80	0.87	25.67
	3.0	100	0.4	3702.29	0.45	0.86	23.07	9.21	8.76	0.39	0.86	27.28	727.19	609.80	0.37	0.86	27.28
Ni	1.0	100	0.4	2804.52	1.87	0.97	23.15	7.10	7.01	1.81	0.97	23.97	178.49	162.47	1.80	0.97	23.97
	2.0	100	0.4	3057.98	1.07	0.95	14.83	7.75	7.32	1.01	0.95	15.91	377.05	347.00	1.04	0.95	15.91
	3.0	100	0.4	4013.31	0.43	0.88	22.16	10.02	7.91	0.38	0.88	25.39	723.79	487.28	0.39	0.88	25.39
Pb	2.0	50	0.4	4508.82	1.03	0.95	13.06	11.50	11.53	0.98	0.95	13.62	1377.80	1357.50	0.41	0.95	13.62
	2.0	150	0.4	5447.87	0.65	0.91	33.73	13.96	14.31	0.60	0.91	34.70	468.59	498.09	0.89	0.91	34.70
	2.0	200	0.4	5560.37	1.12	0.98	15.74	14.15	13.49	1.09	0.98	15.79	387.38	378.75	1.99	0.98	15.79
Cu	2.0	50	0.4	4041.36	0.97	0.96	19.54	10.28	10.12	0.93	0.96	20.80	1181.82	1122.01	0.41	0.96	20.80
	2.0	150	0.4	4643.90	1.04	0.93	19.36	11.66	10.84	0.97	0.93	22.28	456.44	432.61	1.23	0.93	22.28
	2.0	200	0.4	5145.37	1.11	0.98	13.08	13.07	12.14	1.08	0.98	13.94	350.90	334.93	2.02	0.98	13.94
Ni	2.0	50	0.4	3496.66	1.08	0.98	14.90	8.88	9.09	1.05	0.98	15.29	948.80	986.39	0.49	0.98	15.29
	2.0	150	0.4	3424.99	1.09	0.87	18.90	8.32	9.75	0.94	0.87	26.30	285.91	310.81	1.37	0.87	13.74
	2.0	200	0.4	4411.13	1.03	0.98	13.21	11.18	10.29	1.00	0.98	13.74	285.02	272.84	1.96	0.98	13.74
Pb	2.0	100	0.6	4393.32	1.07	0.92	18.59	11.03	11.35	0.99	0.92	21.80	392.63	414.24	0.93	0.92	21.80
	2.0	100	0.8	4260.21	1.94	0.99	11.98	10.15	9.43	1.91	0.99	11.93	269.77	256.58	1.79	0.99	11.93
	2.0	100	1.0	3995.00	2.47	0.97	18.97	10.85	9.96	2.40	0.97	19.43	228.40	220.18	2.28	0.97	19.43
Cu	2.0	100	0.6	3283.42	1.48	0.94	16.58	8.24	8.90	1.39	0.94	19.12	308.08	331.56	1.24	0.94	19.12
	2.0	100	0.8	3463.43	1.89	0.96	22.13	8.69	7.75	1.82	0.96	24.88	234.15	211.16	1.68	0.96	24.88
	2.0	100	1.0	3405.03	2.64	0.97	14.78	8.68	7.71	2.57	0.97	16.39	191.36	175.50	2.33	0.97	16.39
Ni	2.0	100	0.6	2970.38	1.31	0.91	18.55	7.27	8.13	1.19	0.91	22.22	249.64	274.35	1.16	0.91	22.22
	2.0	100	0.8	2843.00	2.52	0.96	21.72	7.20	6.26	2.43	0.96	24.58	188.60	167.13	2.32	0.96	24.58
	2.0	100	1.0	3013.23	2.47	0.97	12.40	7.63	5.79	2.38	0.97	14.10	156.49	143.27	2.33	0.97	14.10