| Summary: | The aim of this work was to evaluate the possibility of applying the dried biomass of <i>E. gracilis</i> var. <i>bacillaris</i> as a biosorbent for the removal of Cd. Experiments were carried out under conditions of batch systems involving aqueous solutions labelled with <sup>109</sup>CdCl<sub>2</sub>. From the kinetics of Cd biosorption, it can be assumed that the Cd removal was a rapid process that achieved the concentration equilibrium of [Cd]<sub>biomass</sub>:[Cd]<sub>solution</sub> in the first minutes of the interaction. In individual experiments, the effect of solution pH, initial biosorbent, or Cd concentration was evaluated. According to MINEQL+ speciation modelling, it was found that the biosorption of Cd decreased linearly corresponding to a decrease in the proportion of Cd<sup>2+</sup> in the solution. The biosorption data were well fitted to the Langmuir model of adsorption isotherm in comparison with the Freundlich model. The maximum biosorption capacity of the dried biomass of <i>E. gracilis</i> var. <i>bacillaris</i> for the removal of Cd was predicted and reached the value <i>Q<sub>max</sub></i> = 0.13 mmol/g or 14.1 mg/g (d.w.), respectively.
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