Author/Authors :
Soleymani، F نويسنده Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran , , Pahlevanzadeh، H نويسنده Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran , , Khani، M نويسنده Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran , , Manteghian، M نويسنده Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran ,
Abstract :
By using response surface methodology, Batch shaking biosorption of cobalt (II)
experiments were conducted in order to examine the combined effects of operating
parameters. The results indicate that magnesium nitrate performed as an effective
biosorbent surface modifier, which increases the rate of adsorption capacity. At optimal
conditions (initial pH 7.0, temperature 45?C, biosorbent concentration 0.1 g/100ml, and
initial cobalt concentration 300mg/l for Mg-treated biomass) the biosorption capacity
of the algae for cobalt was found to be 80.55 mg/g. The Langmuir and Freundlich
isotherms were applied to the equilibrium data. The results are best fitted by the
Freundlich model. Evaluation of the experimental data in terms of biosorption
dynamics showed that the biosorption of cobalt (II) onto algal biomass followed the
pseudo-second-order dynamics well. Using the thermodynamic equilibrium coefficients
obtained at different temperatures, the thermodynamic parameters (?G?, ?H? and ?S?)
were also evaluated.
