Table 3.

Hydrogel adsorption kinetics parameters for an initial MB concentration of 2 mg/L at varying pH values.

Sample	pH	qe,experimental (mg/g)	PFO model			PSO model
			k1 (1/h)	qe (mg/g)	R2	k2 (g/(mg h))	qe (mg/g)	h (mg/(g h))	R2
S-AA-1	2.0	0.26	0.0664	0.25	0.9864	0.4279	0.28	0.0343	0.9942
	4.8	0.39	0.0565	0.36	0.9982	0.2446	0.43	0.0455	0.9953
	7.4	0.90	0.0613	0.85	0.9970	0.1167	0.98	0.1128	0.9915
	10.0	2.01	0.0663	2.07	0.9978	0.0294	2.36	0.1634	0.9852
S-AA-2	2.0	0.20	0.0604	0.18	0.9958	0.5743	0.22	0.0270	0.9958
	4.8	0.35	0.055	0.32	0.9972	0.2545	0.39	0.0387	0.9964
	7.4	0.84	0.0619	0.84	0.9836	0.0974	0.95	0.0873	0.9888
	10.0	1.92	0.0642	2.00	0.9972	0.0271	2.28	0.1416	0.9834
S-AA3	2.0	0.10	0.0569	0.08	0.9783	1.6829	0.10	0.0187	0.9988
	4.8	0.27	0.0585	0.27	0.9807	0.2927	0.30	0.0272	0.9954
	7.4	0.77	0.0585	0.76	0.9959	0.0847	0.89	0.0665	0.9942
	10.0	1.82	0.0579	1.88	0.9966	0.0265	2.18	0.1262	0.9839