Nano- and microsized zeolites as a perspective material for potentiometric biosensors creation

Table 2 Properties of zeolite samples

Sample name	Si/Ala	Surface area (m ² /g)b	Pore size (nm)с	Pore volume (cc/g)c	Particle size (μm)
Na⁺-BEA30	10 ± 1.0	260	0.54	0.84	Approximately 0.4
NH₄ ⁺-BEA30	10 ± 1.0	279	0.64	0.89	Approximately 0.4
H⁺-BEA30	10 ± 1.0	490	0.85	1.3	Approximately 0.4
Na⁺-BEA50	17.7 ± 1.8	462	0.18	0.25	Approximately 0.4
NH₄ ⁺-BEA50	17.7 ± 1.8	494	0.23	0.31	Approximately 0.4
H⁺-BEA50	17.7 ± 1.8	666	0.26	0.54	Approximately 0.4
LTA-4	0.84^d	557	0.31	0.67	4
LTA-9	0.84^d	550	0.28	0.51	9
LTA-22	0.84^d	512	0.18	0.21	22

^aSi/Al ratio of zeolite crystals was measured by EDX; ^bSurface area of samples was measured by BET; ^cPore volume and size of the samples were measured by DR method; ^dSi/Al ratios in the gel.