Simultaneous adsorption and competitiveness of cadmium and copper in natural and man-made soils in the city of Cajapió, Baixada Maranhense
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.005.0046Keywords:
Potentially toxic metals, Isotherms, AdsorptionAbstract
Soil contamination by potentially toxic metals has caused damage to the environment and human health in recent decades. The accumulation of these toxic elements in the soil results from the inadequate deposition of domestic effluents, solid waste and/or the use of inappropriate pesticides for management in agriculture. An alternative to reduce these effects and better understand the behavior of these metals in the soil is the study of adsorption. This work aimed to investigate the capacity of simultaneous adsorption of Cu2 + and Cd2 + in natural and anthropized environments located in the Baixada Maranhense and to verify which adsorption isotherm was more suitable for this study. The physico-chemical characteristics and concentrations of potentially toxic metals were determined by flame atomic absorption spectrometry (FAAS), in addition, all data were plotted for the Langmuir and Freundlich models. The results indicated that the maximum adsorption capacity was favorable to Cu2 + and both isotherms were adapted to the adsorption study, however, it was found that the Langmuir model obtained better proximity to the experimental data. The parameters of Csm and b showed that in a natural environment, the metal Cu2 + was retained in the soils in measurements with different values ​​of binding energies, explained by the affinity of the surface of the adsorbent with the adsorbate.
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