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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Green synthesis, characterization, and application of copper nanoparticles obtained from printed circuit boards to degrade mining surfactant by Fenton process

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Author(s):
Goncalves Martins, Thamiris Auxiliadora [1] ; Alves Falconi, Isabela Brandolis [1] ; Pavoski, Giovani [1] ; de Moraes, Viviane Tavares [2] ; Galluzzi Baltazar, Marcela dos Passos [1] ; Romano Espinosa, Denise Crocce [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Polytech Sch, Dept Chem Engn, Lago St 250, BR-05508080 Sao Paulo, SP - Brazil
[2] Maua Inst Technol, Praca Maua 1, BR-09580900 Sao Caetano do Sul, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 9, n. 6 DEC 2021.
Web of Science Citations: 0
Abstract

The disposal of solid waste containing toxic metals in the composition is a problem of environmental and human contamination. The amount of waste as printed circuit boards has been increasing year by year. New processes that aim at recycling and subsequent application implementing a circular economy of this waste have been gaining importance. This study proposes the printed circuit boards characterization for the copper recycling by acid leaching in two steps, green synthesis of copper nanoparticles using ascorbic acid (vitamin C), and later application of nanoparticles into surfactant degradation through the Fenton-like process. Acid leaching proved a possible methodology for recycling copper, obtaining over 90% recovery. The printed circuit boards show to be a copper secondary source with a weight percentage of about 26 and recovery of 97% in two leaching stages. The synthesis of CuNPs was inferred through UV-Vis with absorption peak in 585 nm and modification of the coloration over time of solutions to dark brown. The syntheses were performed at 70 degrees C, 80 degrees C, and 90 degrees C and in 0.17, 0.5, 0.83, 1, 2, and 3 h, and the stability of copper nanoparticles was verified in 168, 720, and 960 h after syntheses. Stable nanoparticles were produced with different diameters, and they were applied as a catalyst in the Fenton reaction to degrade an amine-based surfactant used in the mining industry. The total carbon degradation found was 57%. It was possible to observe that the recycling of printed circuit boards is strategic to obtain copper from a secondary source, and the synthesis of copper nanoparticles could be used as a product to applicate in the circular economy using the Fenton process. (AU)

FAPESP's process: 19/11866-5 - Development of innovative processes for the recovery of critical metals
Grantee:Denise Crocce Romano Espinosa
Support Opportunities: Research Projects - Thematic Grants