Fig. 5From: Alginate-coated perlite beads for the efficient removal of methylene blue, malachite green, and methyl violet from aqueous solutions: kinetic, thermodynamic, and equilibrium studiesEffect of pH on the adsorption of dyes using a P and b AP. c pHPZC of P and AP (adsorption conditions: concentration of cationic dye 50 ppm, adsorbent amount 2 g/L, contact time 120 min, and temperature 25 ± 1 °C for P and concentration of cationic dye 100 ppm, adsorbent amount 1 g/L, contact time 60 min, and temperature 25 ± 1 °C for AP)Back to article page