Single-Stage Microwave-Assisted Coconut-Shell-Based Activated Carbon for Removal of Dichlorodiphenyltrichloroethane (DDT) from Aqueous Solution: Optimization and Batch Studies

Table 8

Kinetic parameters for the DDT-CSAC adsorption system at 30°C.

Adsorbate initial concentration (mg/L)	qe, exp (mg/g)	Pseudo-first-order				Pseudo-second-order
		qe, cal (mg/g)	k1 (s^−1)	R^2	∆qt (%)	qe, cal (mg/g)	k2 (L/mol.s)	R^2	∆qt (%)
5	4.32	2.19	0.33	0.96	49.28	3.83	0.91	0.99	11.38
10	8.04	4.39	0.39	0.99	45.44	7.08	0.44	0.98	11.90
15	9.91	9.50	0.16	0.93	4.17	9.19	0.40	0.99	7.25
20	11.89	5.77	0.27	0.98	51.44	10.63	0.40	0.99	10.62
25	12.89	8.46	0.43	0.95	34.34	13.50	0.20	0.95	4.70
30	15.32	15.61	1.56	0.95	1.88	16.72	0.13	0.99	9.15