Metal ions Ho(mgg-1min-1) K2(mgg-1min-1) qe(mgg-1) R2
Ni(ii) 0.153 26.49 0.076 0.999
Cu(ii) 0.331 62.11 0.07 0.998
Zn(ii) 1.293 175.50 0.086 0.999
Table 8: Values of kinetic parameters for the pseudo-second order rate for the sorption of the three metal ions on the biomass.