Ih. Ceribasi et U. Yetis, Biosorption of Ni(ii) and Pb(ii) by Phanerochaete chrysosporium from a binary metal system - Kinetics, WATER SA, 27(1), 2001, pp. 15-20
The biosorption kinetics of Ni(II) and Pb(II) by the resting cells of a lig
nolytic white-rot fungus, Phanerochaete chrysosporium. from a binary metal
system were investigated. Kinetic studies revealed that biosorption takes p
lace in two stages: a rapid surface adsorption, within the first 30 min, an
d a slow intracellular diffusion till the end of the 3 h contact time. In t
he first minutes of contact solution pH decreased sharply, parallel to the
fast metal uptake, probably because of the protons released by the biosorbe
nt. As sorption equilibrium was reached, solution pH also reached an equili
brium level. Metal biosorption capacities increased as the initial metal co
ncentrations (C-i) increased. independent of initial pH (pH(i)) and general
ly the metal with higher C-i had a higher uptake capacity. The results also
show that some portion of the metal. ions sorbed by P. chrysosporium was r
eadily released to solution with a decrease in pH. At equilibrium, the maxi
mum total metal uptake of P. chrysosporium was 109.5 mg/g and was reached a
t pH(i) 5. Under these circumstances Ni(II) and Pb(II) uptake capacities we
re 55.9 mg Ni/g and 53.6 mg Pb/g, respectively.