Sol-gel synthesis, characterization, and catalytic properties of Ni, Cd, Co, and Fe oxides recycled from spent Ni-Cd batteries using citric acid as a leaching agent
| Autor: | T.F.M. Moreira, S.A.D. Ferreira, M.F.F. Lelis, I.L. Santana, M.B.J.G. Freitas, Josimar Ribeiro |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Nickel oxide Inorganic chemistry Iron oxide Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Cadmium oxide Mixed oxide General Materials Science Leaching (metallurgy) 0210 nano-technology Cobalt oxide Nuclear chemistry |
| Zdroj: | Materials Chemistry and Physics. 205:186-194 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2017.11.025 |
| Popis: | This research developed a sustainable, green, hydrometallurgical route for recycling the positive electrodes of Ni-Cd batteries using citric acid as a leaching agent. The mixed oxide was synthesized using a gel precursor that was calcinated at 400 °C for 2 h. The mixed composition of the metal oxide included nickel oxide (NiO), cadmium oxide (CdO), cobalt oxide (Co3O4), and iron oxide (Fe2O3). A scanning electron microscopy (SEM) micrograph showed that the mixed oxide presented no well-defined morphological structure but did present macropores that were about 20 μm in size and micropores that were 1.0 μm in size. Transmission electron microscopy (TEM) images showed that the agglomerate was composed of hexagonal structures that were nanometric in size. The material was applied in a photocatalytic reaction to discolor a textile-reactive black V-2B dye (C26H21O19N5S6Na4). The efficiency of the discoloration reached 86.10% in 480 min, and the catalyzed reaction showed second-order kinetics. |
| Databáze: | OpenAIRE |
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