Contribution of Ion-Exchange and Non-Ion-Exchange Reactions to Sorption of Ammonium Ions by Natural and Activated Aluminosilicate Sorbent

Table 1

Chemical composition of natural and activated sorbent M₄₅C₂₀.

Sorbent	Content (% per absolutely dry sample)								Silicate module, SiO2/Al2O3
	SiO2	Al2O3	Fe2O3	CaO	MgO	Na2O	K2O	Loss on ignition
MCN	56.65	14.32	7.03	8.12	1.62	0.79	2.78	7.9	2.65
MCAc	80.71	9.14	0.70	1.86	1.04	0.24	1.32	7.3	8.20
MCAlk	50.72	15.50	8.13	8.79	0.55	5.32	2.80	7.3	2.14

Note: MCN: natural sorbent M₄₅C₂₀; MCAc and MCAlk are M₄₅C₂₀ sorbent treated with acid and alkali, respectively.