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http://hdl.handle.net/1843/56968| Tipo: | Artigo de Periódico |
| Título: | Synthesis and characterization of cobalt nanoparticles for application in the removal of textile dye |
| Autor(es): | Jean Castro da Cruz Mayra Aparecida Nascimento Héryca Alves Vieira do Amaral Diego S. D. Lima Ana Paula de Carvalho Teixeira Renata Pereira Lopes |
| Resumo: | In this work, magnetic cobalt nanoparticles (CoNPs) were synthesized and applied to the removal of Remazol golden yellow RNL (RGY) from aqueous solutions and textile wastewater. The CoNPs were characterized and the Co content found in the CoNPs was 60.38% (m/m). The analysis of X-ray Diffraction (XRD) and Raman Spectroscopy indicated the presence of Co0 and CoO in the composition of the material, as confirmed by Thermogravimetric Analysis coupled to Mass Spectrometry (TG-MS). Images obtained by the Transmission Electron Microscope (TEM) showed that the CoNPs have sizes smaller than 10 nm, sphere morphology and high agglomeration capacity. The results obtained by nitrogen adsorption-desorption suggested that the nanomaterial presented a mesoporous characteristic, low specific surface area (15.70 m2 g−1) and a pore volume and pore diameter of 0.072 cm3 g−1 and 3.64 nm, respectively. CoNPs removed the RGY with high efficiency, reaching almost 100% removal in 30 min. The kinetic results showed that the reaction followed pseudo-second-order kinetics. Additionally, the removal process can be altered depending on the experimental condition. For instance, under acidic conditions, the reductive degradation prevailed, while in neutral or basic conditions, two simultaneous processes occur: reductive degradation and adsorption. Finally, CoNPs were applied to textile wastewater. The results showed high discoloration, reaching almost 88%. However, there was only a 32% decrease in chemical oxygen demand, showing that CoNPs are efficient at removing organic dyes from aqueous solutions. |
| Assunto: | Nanopartículas Água - Reutilização Materiais nanoestruturados Raios X - Difração Raman, Espectroscopia de Espectrometria de massa Nitrogenio - Absorção e adsorção Termogravimetria |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE QUÍMICA |
| Tipo de Acesso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1016/j.jenvman.2019.04.059 |
| URI: | http://hdl.handle.net/1843/56968 |
| Data do documento: | 2019 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0301479719305262 |
| metadata.dc.relation.ispartof: | Journal of Environmental Management |
| Aparece nas coleções: | Artigo de Periódico |
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