Formulation of Synthesized Zinc Oxide Nanopowder into Hybrid Beads for Dye Separation

Table 4

Kinetic parameters of dye adsorption onto ZOHB at different dye concentrations.

Kinetic model	(𝑞𝑒)exp (mg/g)	Pseudo-first order			Pseudo-second order
Dye concentration (mg/L)		(𝑞𝑒)cal (mg/g)	𝐾1 (min^−1)	𝑅^2	(𝑞𝑒)cal (mg/g)	𝐾2 (g/mg min)	𝑅^2
1	0.193	0.19	−0.052	0.99	0.34	0.089	0.958
10	1.89	1.88	−0.0053	0.98	2.56	0.018	0.967
25	4.35	4.3	−0.0053	0.98	5.87	0.0079	0.985
50	8.5	8.9	−0.006	0.966	11.67	0.0041	0.975
75	12.54	18.9	−0.076	0.94	22.98	0.00114	0.917
100	16.25	19.1	0.078	0.94	25.2	0.0012	0.93