Preparation of a Modified Nanoalumina Sorbent for the Removal of Alizarin Yellow R and Methylene Blue Dyes from Aqueous Solutions

Table 3

Comparison of the kinetic constants and statistical parameters for the adsorption of AY and MB on γ-alumina and DNPH-γ-alumina.

Dye	Kinetic model	Kinetic and Statistical parameters	γ-Alumina		DNPH-γ-alumina
			Initial concentration (mg/L)
			20	40	20	40
AY	Pseudo-first order	mg/g	5.10	12.08	4.75	16.23
		(min^−1)	0.035	0.013	0.038	0.033
			0.977	0.803	0.998	0.861
		Std error	0.098	0.116	0.03	0.24
		Std deviation	0.569	0.227	0.60	0.57
			37.23	37.20	36.68	23.33
AY	Pseudo-second order	mg/g	18.90	28.01	18.08	35.59
		(g mg^−1min^−1)	0.019	0.012	0.021	0.005
			0.999	0.999	0.999	0.986
		Std error	0.024	0.015	0.02	0.06
		Std deviation	0.837	0.564	0.87	0.45
			0.00002	0.991	0.0009	0.0003
AY	Intraparticle diffusion	(mg/g)	12.97	14.85	12.69	19.28
		(mg/g⋅min^1/2)	0.745	2.003	0.664	1.842
			0.974	0.758	0.983	0.922
		Std error	0.232	2.150	0.155	0.950
		Std deviation	1.285	3.913	1.03	2.95
			1.440	5.640	2.14	13.98
AY	mg/g		18.88	33.28	17.95	35.69
MB	Pseudo-first order	mg/g	2.29	0.50	4.02	19.75
		(min^−1)	0.021		0.069	0.072
			0.168		0.882	0.992
		Std error	0.851		0.458	0.119
		Std deviation	0.808		1.16	1.15
			4.99		8.11	0.06
MB	Pseudo-second order	mg/g			10.09	24.94
		(g mg^−1min^−1)			0.034	0.004
					0.998	0.996
		Std error	3.16 × 10^−4	3.16 × 10^−4	0.074	0.045
		Std deviation	2.79	1.17	1.57	0.63
			0	7.4 × 10^−6	0.013	0.677
MB	Intraparticle diffusion	(mg/g)	1.83	13.92	7.09	5.79
		(mg/g⋅min^1/2)	0.434		0.357	2.163
			0.432	0.650	0.994	0.960
		Std error	0.880	0.390	0.048	0.780
		Std deviation	1.012	0.573	0.55	3.40
			8.057	0.010	0.96	38.91
MB	mg/g		5.67	13.54	9.73	20.83