Adsorption of Basic Brown and Chrysophenine from Water Solution by Magnesium Silicate Gel

Table 2

Second-order kinetics values calculated for the adsorption of the two dyes on magnesium silicate gel.

Dyes	C0	/K	First-order		Second-order
	mg⋅g^−1		/min^−1	R^2	/mg⋅g^−1	/mg⋅g^−1	k2/g⋅mg^−1⋅min^−1	R^2
Basic Brown		298	0.0187	0.951	76.6	76.92	0.0180	1.000
		308	0.0377	0.973	76.4	76.92	0.0133	1.000
		318	0.0043	0.944	76.1	74.07	0.0190	1.000
Chrysophenine		298	0.0092	0.972	56.8	60.61	5.44 × 10^−4	0.9975
		308	0.0079	0.994	76.4	58.82	5.47 × 10^−4	0.9980
		318	0.009	0.993	76.1	57.47	4.90 × 10^−4	0.9974