Abstract
The dumping of the mining tailings dam from Mariana, Brazil released about 34 million mining tailings in the Doce river basin, containing many toxic metals. The biomasses of banana and rice were used as adsorbents in the removal of Cu (II) and Pb (II) metals from contaminated water. Quantification of metals was performed using NexION 300D PerkinElmer (USA) ICP-MS. The pH effect studies indicated that the adsorption analyzed in the present work did not undergo significant changes with the variation of the pH values, thus for both banana and rice the best adsorption capacity of Cu (II), 34.11 mg g−1 and 34.37 mg g−1, was at pH 5. For Pb (II), the highest adsorption capacity was also at pH 5 with 36.06 mg g−1 for banana and 36.04 mg g−1 for rice. There was a rapid adsorption where, in all cases in the first 30 minutes of adsorption, more than 60% of the metals had already been adsorbed. Finally, tests were carried out using real samples from Doce river contaminated by the metals under study due to the Mariana disaster. The biomasses presented excellent performance in Cu (II) and Pb (II) removal, reaching concentrations close to zero after adsorption process.
Highlights
Pollution from toxic metals is a serious environmental problem all over the world
In all the images it is possible to observe a porous structure, being able to be susceptible to adsorption of metals on its surface. 3.1.2 Infrared spectroscopy with fourier transform
The wavenumber 2930 cm−1 corresponds to the axial deformation of aliphatic and hydro aromatic carbon sp3 carbon bonds found in cellulose and hemicellulose [17]
Summary
The intense technological and industrial development led to the excessive use of toxic metal ions and, increased water pollution. These metals are often reported to be harmful to humans and other organisms because of their high toxicity and cumulative effects [1]. Water Quality - Factors and Impacts concentrations of elements such as Pb and Cu, well above maximum value recommended by environmental legislation [4]. In this sense, it is necessary to develop technologies that can remove these pollutants, so that this water is properly used for human and animal consumption
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