Fig. 4From: Novel pre-treatment of zeolite materials for the removal of sodium ions: potential materials for coal seam gas co-produced wastewaterEffect of zeolite treatment on the effective adsorption of Na+ ions and the percentage of Na+ ions removed. Na+ concentration 0.1 M at pH 7, shaking speed of 300 rpm at 25 °C and solid–liquid ratio of 50 g/L. Each data point is a mean of two replicates, which did not vary by more than 5 %Back to article page