Fig. 4

Effect of adsorbent dosage on adsorption capacity and percentage removal of Cr(VI) ions on the adsorption of Cr(VI) by BP, RSS, and CKS (adsorption conditions: concentration of Cr(VI), 50 ppm; pH 2; contact time, 1 h; temperature, 25 ± 1 °C; λ = 540 nm)