Management of waste printed circuit boards via supercritical water technology

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dc.creatorSouza, Guilherme Botelho Meireles de
dc.creatorPereira, Mariana Bisinotto
dc.creatorSantos, Lucas Francisco dos
dc.creatorAlonso, Christian Gonçalves
dc.creatorJegatheesan, Veeriah
dc.creatorCardozo Filho, Lúcio
dc.date.accessioned2023-09-08T14:20:06Z
dc.date.available2023-09-08T14:20:06Z
dc.date.issued2022
dc.description.abstractIn this study, the application of the supercritical water technology on the management of waste printed circuit boards (PCBs) obtained from small information technology (IT) and communication equipment was conducted. Initially, an extensive recycling-oriented characterization of waste printed circuit boards was conducted through a combination of several physicochemical analyzes such as MP-AES, XRF, TG/DTA, CHNS elemental analysis, SEM and XRD. Afterwards, at supercritical conditions of water (Tc > 374.29 °C and Pc > 22.089 MPa), the optimal conditions for the degradation of the organic polymers present in the waste PCBs were defined by a response surface methodology. A complete organic degradation rate (ODR) was achieved at 600 °C, reaction time of 60 min, waste PCBs load of 15 g and flow-rate of 5 mL min−1. After the removal of the organic polymers, the metals were liberated, and the metal recovery efficiency (MRE) reached values higher than 90% at all evaluated conditions. Then, initial insights on the subsequent treatment of the liquid decomposition by-products generated during the supercritical water (ScW) processing of waste PCBs were provided. A total organic carbon reduction of 99.88% was achieved via the ScW oxidation process using the same experimental apparatus. The treated solution was successfully re-used in the ScW processing of waste PCBs instead of clean water. Moreover, hydrogen, methane, CO2, and CO were identified as the major gaseous products associated to the supercritical water treatment of waste PCBs. Finally, a novel strategy to enhance the production of combustible gases, through the addition of ethanol and glycerol, and increase the economic feasibility of the supercritical water processing of waste PCBs was proposed.pt_BR
dc.identifier.citationSOUZA, Guilherme Botelho Meireles de et al. Management of waste printed circuit boards via supercritical water technology. Journal of Cleaner Production, Amsterdam, v. 368, e133198, 2022. DOI: 10.1016/j.jclepro.2022.133198. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S095965262202786X?via%3Dihub. Acesso em: 29 ago. 2023.pt_BR
dc.identifier.doi10.1016/j.jclepro.2022.133198
dc.identifier.issn0959-6526
dc.identifier.issne- 1879-1786
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S095965262202786X?via%3Dihub
dc.language.isoengpt_BR
dc.publisher.countryHolandapt_BR
dc.publisher.departmentInstituto de Química - IQ (RMG)pt_BR
dc.rightsAcesso Restritopt_BR
dc.subjectElectronic wastept_BR
dc.subjectDepolymerizationpt_BR
dc.subjectMetal recoverypt_BR
dc.subjectOrganic degradationpt_BR
dc.subjectPrinted circuit boardspt_BR
dc.subjectSupercritical waterpt_BR
dc.titleManagement of waste printed circuit boards via supercritical water technologypt_BR
dc.typeArtigopt_BR

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