Abstract
In this study, direct black dye removal was investigated using iron nanoparticles (Fe NPs), copper (Cu NPs), and Fe/Cu (Fe/Cu NPs). NPs were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Using a dose of 0.25 g L−1 of Fe, Cu, and Fe/Cu NPs, a degradation efficiency of 13, 26, and 43% respectively was obtained. For the 1.00 g L−1 dose, the efficiency increased to 100, 43, and 100%, respectively. Studies in anoxic and oxic conditions presented degradation rates, respectively, of 100 and 30% for Fe NPs, 90 and 50% for Fe/Cu NPs, and 40% in both reactions for Cu NPs, indicating that the mechanism of dye degradation by NPs is predominantly reducing under the conditions studied. The addition of EDTA decreased the dye removal rate for Fe, Cu, and Fe/Cu NPs at 27, 10, and 35%, respectively. In addition to the degradation, the adsorption phenomena of the by-products formed during the reaction were confirmed by the Fourier transform infrared (FTIR) analysis and verified by the desorption tests. Fe and Fe/Cu NPs showed the highest efficiency in direct black dye reductive degradation and adsorption of by-products, removing 100% of the dye at a dose of 1 g L−1 within 10 min of reaction.
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Acknowledgments
We thank the Center of Microscopy at the Federal University of Minas Gerais (http://www.microscopia.ufmg.br) for providing the equipment and technical support for experiments involving electron microscopy.
Funding
This study received financial support from Brazilian agency CAPES (Coordination of Improvement of Higher Level Personnel) and FAPEMIG (Minas Gerais Research Foundation).
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Ourique, M.F., Sousa, P.V.F., Oliveira, A.F. et al. Comparative study of the direct black removal by Fe, Cu, and Fe/Cu nanoparticles. Environ Sci Pollut Res 25, 28928–28941 (2018). https://doi.org/10.1007/s11356-018-2842-0
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DOI: https://doi.org/10.1007/s11356-018-2842-0