6533b82efe1ef96bd1292959

RESEARCH PRODUCT

Optimization of the sorption process of copper cations from aqueous solution by pine bark (Pinus sylvestris)

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This study examined the effect of the chemical modification of pine bark (Pinus sylvestris) on the sorption efficiency of copper cations. The results were interpreted using pseudo-first order and pseudo-second order reaction models as well as Langmuir and Freundlich isothermal models. The sorption experiments were carried out using the batch technique. The study indicated the effect of the competitive sorption of copper cations and hydrogen cations as well as the adverse effect on the sorption efficiency of copper hydroxides formed under alkaline conditions. The need to assess the measurement uncertainty in determining the basic parameters of the sorption process was indicated. It was also shown that the modification of the pine bark with a solution of hydrochloric acid and sodium hydroxide, when compared to the raw bark, reduced the sorption capacity by more than 29%. It was confirmed that the main mechanism of the sorption of heavy metals in natural sorbents is ion exchange