Table 4.

Zeta potential values for beta zeolites.

Material	Concentration (mg/mL)	T (°C)	Maximum Zeta Potential (mV) at pH as ( ) *	IEP 1 *	IEP2 *
H-beta-25	2–4	25	16 (4.5)	4.0	5.7
	2–4	50	0.7 (3.9)	3.7 **	4.0 **
	2–4	65	–3.7 (3.7)	no
H-beta-150	2–4	25	14 (4.7)	4	5.7
	2–4	50	–3 (3.9)	no
H-beta-150	2–4	65	–4.8 (3.6)	no
H-beta-300	2–4	25	no	no
	2–4	50	no	no
	2–4	65	no	no

* Average for concentrations 2–4 mg/mL; ** These values correspond to concentration of 2 mg/mL. No IEP were obtained for other concentrations.