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- Title
Copper recovery by solvent extraction for nanoparticle synthesis from waste motherboards.
- Authors
Martins, Thamiris Auxiliadora Gonçalves; de Moraes, Viviane Tavares; Espinosa, Denise Crocce Romano
- Abstract
Printed circuit boards, which make up part of waste from electrical and electronic equipment, contain elements that can be economically reused, such as copper, silver, gold, and nickel, as well as metals that are harmful to the environment and health, such as lead, mercury, and cadmium. Thus, through recycling this scrap, materials that would otherwise be discarded can be reinserted as secondary raw materials to produce new consumer goods through urban mining. In this context, the synthesis of nanoparticles shows promise as it allows the reinsertion of these materials in the manufacture of new products. Therefore, this study used obsolete computer motherboards as a secondary material to obtain copper to produce nanoparticles of this metal. From a solution based on the leach liquor of this scrap, a purification route using solvent extraction was defined and applied to the real leach liquor. Applying the hydroxyoxime extractant at a dilution of 20% (v/v) in kerosene, A/O of 1/1, 298 K, and 0.25 h of contact during extraction, and stripping in H2SO4 (2 M), 298 K, 0.25 h, W/O ratio of 3/1, and two theoretical countercurrent stages, a solution containing more than 95% of the copper in the leach liquor could be obtained with less than 1% of contaminants. From this purified liquor, nanoparticles containing copper and metallic copper oxides and hydroxides were produced, with an average size of 84 nm, at pH 11, 3 h of hot stirring, volume of 0.015 L of ascorbic acid (0.50 M) and 0.015 L of precursor solution (0.03 M Cu), and temperature (343 K).
- Subjects
NANOPARTICLE synthesis; COPPER; SOLVENT extraction; ELECTRONIC waste; METAL nanoparticles; MOTHERBOARDS; LEAD
- Publication
Environmental Science & Pollution Research, 2024, Vol 31, Issue 27, p39690
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-024-33797-7