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

Figure 6

Pseudo-second-order kinetic plots onto RHA: (a) for Fe(II) biosorption and (b) for Mn(II) biosorption (metal concentration: 20 mg/L; adsorbent dosage: 0.6 g/100 mL; contact time: 90 min; pH: 5 and 6, resp.).

(a)

(b)