Batch Adsorption of Maxilon Red GRL from Aqueous Solution by Natural Sugarcane Stalks Powder

Table 2

Comparison of the first-order and second-order adsorption rate constants and calculated and experimental 𝑞_𝑒 values for different initial Maxilon Red GRL concentrations on sugarcane stalks powder.

𝐶0 (mg/L)	Pseudo first-order kinetics			Pseudo second-order kinetics
	𝑞𝑒,cal (mg/g)	𝑘1 (min^−1)	𝑅^2	𝑞𝑒,cal (mg/g)	𝑘2 (g/mg min)	𝑅^2
25	8.91	7.24×10^−2	0.9544	23.92	1.27×10^−2	0.9999
50	14.55	5.47×10^−2	0.9104	42.01	0.72×10^−2	0.9994
75	30.72	7.92×10^−2	0.9708	44.64	0.40×10^−2	0.9982
100	17.30	6.27×10^−2	0.9389	34.48	0.31×10^−2	0.9717