Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Table 4

Kinetic model parameters for adsorption of MB.

Adsorbent HAP: BENT mass (mg)	Experiment qe (mg/g)	Pseudo-first-order (PFO)			Pseudo-second-order (PSO)
		K1 (min^−1)	qe (mg/g)	R^2	K2 (g/mg/min)	qe (mg/g)	R^2
24.0	20.70	0.049	12.189	0.48	0.002	20.75	1
34.5	14.23	0.007	0.001	0.33	0.005	14.25	1
33.0	12.81	0.051	952.581	0.63	0.006	12.59	0.99