Table 4.

Isotherm parameters for the adsorption of As(III) onto BFA-Fe at different temperatures

Isotherms	Constants	Temperatures (Kelvin, K)
		283	293	303	313	323
Langmuir	KL, dm3 µg−1	0.034	0.008	0.245	0.018	0.002
	qm, µg g−1	109.890	144.928	13.514	217.391	553.595
	R2 (dm3 linear)	0.932	0.951	0.991	0.997	0.993
	R2 (Non-Linear)	0.984	0.997	0.999	0.998	0.997
	HYBRID	-1.885	-3.029	93.757	-0.218	-123.732
	MPSD	12.153	5.025	81.154	4.092	150.113
Freundlich	KF, dm3 µg−1	8.209	1.833	5.948	7.050	3.248
	n	1.883	1.314	1.511	1.513	1.802
	1/n	0.531	0.751	0.521	0.551	0.555
	R2 (Linear)	0.891	0.984	0.952	0.953	0.955
	R2 (Non-Linear)	0.944	0.992	0.981	0.981	0.978
	HYBRID	-1.545	-0.933	-1.571	-1.570	5.724
	MPSD	19.045	13.718	17.199	18.232	20.277
Temkin	B	25.475	23.579	25.139	39.938	11.857
	KT, dm3 µg−1	0.275	0.152	0.323	0.253	0.394
	R2 (Linear)	0.913	0.957	0.977	0.953	0.971
	R2 (Non-Linear)	0.955	0.978	0.989	0.981	0.985
	HYBRID	-2.353	20.414	7.047	13.215	22.194
	MPSD	10.855	75.181	33.357	50.847	58.844
Redilich-Peterson	aR, dm3 µg−1	1.742	5.758	1.410	1.573	20.547
	KR, dm3 µg−1	8.400	12.000	12.292	15.805	58.723
	Β	0.559	0.255	0.415	0.394	0.450
	R2 (Linear)	0.887	0.853	0.782	0.889	0.934
	R2 (Non-Linear)	0.942	0.877	0.884	0.942	0.955
	HYBRID	108.144	-1.001	-1.405	-1.551	2.239
	MPSD	82.139	14.977	22.324	18.315	33.301