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Fig. 3 | SpringerPlus

Fig. 3

From: Novel pre-treatment of zeolite materials for the removal of sodium ions: potential materials for coal seam gas co-produced wastewater

Fig. 3

Intra-particle diffusion model of Na+ ions and experimental data for natural and treated zeolite materials. Initial Na+ concentration 0.1 M at pH 7, shaking speed of 300 rpm at 25 °C and solid–liquid ratio 50 g/L. The symbols are as follows: (circles) Natural zeolite form, (triangle) Ca2+ form, (square) H+ form, (cross) K+ form, (diamond) NH4 + form

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