Bisphenol-S removal via photoelectro-fenton/H2O2 process using Co-porphyrin/Printex L6 gas diffusion electrode

Author(s)

Marques Cordeiro-Junior, Paulo Jorge ; Martins, Alysson Stefan ; Santana Pereira, George Bueno ; Rocha, Fillipe Vieira ; Rodrigo Rodrigo, Manuel Andres ; de Vasconcelos Lanza, Marcos Roberto

• Document type: Journal article
• Source: Separation and Purification Technology; v. 285, p. 13-pg., 2022-03-15.

Abstract

The present work reports the development and application of gas diffusion electrode (GDE) based on carbon Printex L6 modified with 5% Co-Porphyrin/CPL6 for the removal of Bisphenol S (BPS) in wastewater using different electrochemical advanced oxidation processes (EAOPs). The application of the modified GDE led to the in-situ generation of 333 mg L-1 of H2O2 in only 90 min; this represents an increase of 88% in H2O2 generation in relation to the unmodified GDE. The process involving bisphenol S degradation fitted well into a pseudo-first order kinetic reaction for all the treatment techniques evaluated; the treatment techniques investigated recorded an increase in kinetic rate constant in the following order: anodic oxidation (0.004 min(-1)) < UV-C (0.006 min(-1)) < H2O2 (0.008 min(-1)) < H2O2/UV-C (0.016 min(-1)) < electro-Fenton (0.063 min(-1)) < photo electro-Fenton (0.154 min(-1)). The photo electro-Fenton (PEF) process exhibited the best degradation efficiency; BPS was completely removed after only 30 min of treatment and 78% mineralization was recorded after 360 min of treatment. The remaining organic matter under the PEF treatment process corresponded to short-chain carboxylic acids; this confirms the efficiency of the process applied for BPS decontamination. The results obtained show that the proposed treatment mechanism can be successfully combined with cheaper biological treatments for a total remediation of wastes. (AU)

• FAPESP's process: 20/13088-7 - Modified gas diffusion electrodes applied in the degradation of organic pollutants in a flow electrochemical reactor
• Grantee: Paulo Jorge Marques Cordeiro Junior
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 19/11242-1 - Relative quantification of DNA-Topoisomerases enzymes in cell lines: Correlation between cytotoxicity and mechanism of action of coordination compounds
• Grantee: Fillipe Vieira Rocha
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/04201-9 - Transition metal compounds bearinhg thiosemicarbazones and phosphines as ligand: investigation of cytotoxicity and mechanism of action
• Grantee: Fillipe Vieira Rocha
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/01937-4 - Synthesis of binary metal oxides (Nb, Zr, Ta, Ru, Mo and Co) supported on amorphous carbon for the production of gas diffusion electrodes (GDE) for the electrosynthesis of H2O2 in situ in flow reactors.
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/13123-4 - Development of photoelectrocatalytic membranes based on TiO2 and Al2O3 modified and applied in the treatment of organic contaminants and microorganisms in aqueous solution
• Grantee: Alysson Stefan Martins
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/19612-4 - Degradation of endocrine disruptors carbofuran, methylparaben and propylparaben via electrogenerated H2O2 and associated processes (electrogenerated H2O2/UV, electro-Fenton e photoelectro-Fenton)
• Grantee: Paulo Jorge Marques Cordeiro Junior
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)