Biosorption of Fe(II) and Mn(II) Ions from Aqueous Solution by Rice Husk Ash

Figure 7

Freundlich isotherm plots for the biosorption of Fe(II) and Mn(II) onto RHA (adsorbent dosage: 0.6 g/100 mL; contact time: 90 min; pH: 5 and 6, resp.).