Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Figure 6

Effect of contact time on removal of Cr(VI) using organobentonite. Conditions:  = 50 mg/L, V = 50 mL, T = 20°C, pH = 3.0, stirring speed = 200 rpm, and HDTMA-Bent = 0.2 g.