Insights on applications of bentonite clays for the removal
Ullah Z and his research team prepared HCl-activated bentonite by treating 50 g of refined clay with 250 mL reflux of HCl (1 mol L −1) solution in a round-bottom flask for 2 h at 80 °C. Untreated clay (Fig. 3a) demonstrated minor porosity and surface irregularities, which declined dye adsorption for a lower surface area (929.64 m 2 g −1).