Table 2. Freundlich and Langmuir isotherm constants for As(V) removal from tap and demineralized water by three adsorbents.

	Adsorbent	Freundlich isotherm constants					Langmuir isotherm constants
		KF (mg/g)·(L/g)n	1/n	qeF* mg/g	R2		Q0 mg/g	KL L/mg	RL	qeL* mg/g	R2
Tap water	Iron(III) hydroxide	5.85	0.7880	20.80	0.9571		376.2	10.4	0.49	18.60	0.9685
	Bayoxide E33	0.13	0.7535	0.42	0.9510		8.0	9.5	0.51	0.36	0.9954
	Titansorb	0.07	0.4731	0.14	0.9458		1.2	11.6	0.46	0.06	0.9380
Demineralized water	Iron(III) hydroxide	10.30	0.5454	24.70	0.9012		181.9	23.9	0.29	24.30	0.9766
	Bayoxide E33	0.47	0.3639	0.85	0.9277		1.9	229.5	0.04	1.04	0.9848
	Titansorb	0.05	0.5195	0.11	0.9114		1.4	6.5	0.61	0.04	0.9971

*Calculated amount of adsorbate in the adsorbent at an equilibrium concentration of γ_e=5 µg/L