Removal of bisphenol A from acidic sulfate medium and urban wastewater using persulfate activated with electroregenerated Fe2+
Model solutions of bisphenol A (BPA) in 0.050 M Na2SO4 at pH 3.0 have been treated by the electro/Fe2+/persulfate process. The activation of 5.0 mM persulfate with 0.20 mM Fe2+ yielded a mixture of sulfate radical anion (SO4*- ) and * OH, although quenching tests revealed the prevalence of the forme...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Estado: | Versión aceptada para publicación |
| Data de publicação: | 2020 |
| País: | España |
| Recursos: | Universidad de Barcelona |
| Repositório: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/170748 |
| Acesso em linha: | https://hdl.handle.net/2445/170748 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Depuració d'aigües residuals Contaminants emergents en l'aigua Purification of sewage Emerging contaminants in water |
| Resumo: | Model solutions of bisphenol A (BPA) in 0.050 M Na2SO4 at pH 3.0 have been treated by the electro/Fe2+/persulfate process. The activation of 5.0 mM persulfate with 0.20 mM Fe2+ yielded a mixture of sulfate radical anion (SO4*- ) and * OH, although quenching tests revealed the prevalence of the former species as the main oxidizing agent. In trials run in an IrO2/carbon-felt cell, 98.4% degradation was achieved alongside 61.8% mineralization. The energy consumption was 253.9 kWh (kg TOC) -1, becoming more cost-effective as compared to cells with boron-doped diamond and Pt anodes. Carbon felt outperformed stainless steel as cathode because of the faster Fe2+ regeneration. All BPA concentration decays agreed with a pseudo-fist-order kinetics. The effect of persulfate, Fe2+ and BPA concentrations as well as of the applied current on the degradation process was assessed. Two dehydroxylated and three hydroxylated monobenzenic by-products appeared upon SO4*- and * OH attack, respectively. The analogous treatment of BPA spiked into urban wastewater yielded a faster degradation and mineralization due to the cogeneration of HClO and the larger *OH production as SO4*- reacted with Cl- . |
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