Valorization of e-waste via supercritical water technology: an approach for obsolete mobile phones

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dc.creatorSouza, Guilherme Botelho Meireles de
dc.creatorPereira, Mariana Bisinotto
dc.creatorMourão, Lucas Clementino
dc.creatorAlonso, Christian Gonçalves
dc.creatorJegatheesan, Veeriah
dc.creatorCardozo Filho, Lúcio
dc.date.accessioned2023-09-06T14:07:36Z
dc.date.available2023-09-06T14:07:36Z
dc.date.issued2023
dc.description.abstractThe improper handling of electronic waste has not only severe environmental impacts but also results in the loss of high economic potential. To address this issue, the use of supercritical water (ScW) technology for the eco-friendly processing of waste printed circuit boards (WPCBs) obtained from obsolete mobile phones has been explored in this study. The WPCBs were characterized via MP-AES, WDXRF, TG/DTA, CHNS elemental analysis, SEM and XRD. A L9 Taguchi orthogonal array design was employed to evaluate the impact of four independent variables on the organic degradation rate (ODR) of the system. After optimization, an ODR of 98.4% was achieved at a temperature of 600 °C, a reaction time of 50 min, a flowrate of 7 mL min−1, and the absence of an oxidizing agent. The removal of the organic content from the WPCBs resulted in an increase in the metal concentration, with up to 92.6% of the metal content being efficiently recovered. During the ScW process, the decomposition by-products were continuously removed from the reactor system through the liquid or gaseous outputs. The liquid fraction, which was composed of phenol derivatives, was treated using the same experimental apparatus, achieving a total organic carbon reduction of 99.2% at 600 °C using H2O2 as the oxidizing agent. The gaseous fraction was found to contain hydrogen, methane, CO2, and CO as the major components. Finally, the addition of co-solvents, namely ethanol and glycerol, enhanced the production of combustible gases during the ScW processing of WPCBs.pt_BR
dc.identifier.citationSOUZA, Guilherme Botelho Meireles de et al. Valorization of e-waste via supercritical water technology: an approach for obsolete mobile phones. Chemosphere, Amsterdam, v. 337, e139343, 2023. DOI: 10.1016/j.chemosphere.2023.13934. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S0045653523016107?via%3Dihub. Acesso em: 29 ago. 2023.pt_BR
dc.identifier.doi10.1016/j.chemosphere.2023.13934
dc.identifier.issne- 1879-1298
dc.identifier.issn0045-6535
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S0045653523016107?via%3Dihub
dc.language.isoengpt_BR
dc.publisher.countryHolandapt_BR
dc.publisher.departmentInstituto de Química - IQ (RMG)pt_BR
dc.rightsAcesso Restritopt_BR
dc.subjecte-wastept_BR
dc.subjectDepolymerizationpt_BR
dc.subjectMetal recoverypt_BR
dc.subjectUrban miningpt_BR
dc.subjectMobile phonept_BR
dc.subjectSupercritical waterpt_BR
dc.titleValorization of e-waste via supercritical water technology: an approach for obsolete mobile phonespt_BR
dc.typeArtigopt_BR

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