Preparation and Characterization of Chitosan/Feldspar Biohybrid as an Adsorbent: Optimization of Adsorption Process via Response Surface Modeling

Table 7

Kinetics parameters for the adsorption of AB1.

Dye concentration  (mg L^−1)	Pseudo-first-order 𝑡 = 0–90 min			Pseudo-second-order 𝑡 = 0–90 min
	𝐾1 (min^−1)	𝑞1 (mg g^−1)	𝑟^21	𝐾2 (g/mg^−1 min^−1)	𝑞𝑒 (mg g^−1)	𝑟^21
25	0.071	1.154	0.777	0.240	4.167	1
50	0.088	2.051	0.774	0.140	8.333	0.999
75	0.046	6.383	0.892	0.022	12.500	0.997
100	0.046	9.506	0.927	0.014	16.129	0.997
125	0.042	9.12	0.861	0.013	17.241	0.997