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Olvera-Vargas H, Selvam S, Veer R, García-Rodríguez O, Mutnuri S, Lefebvre O. A sustainable activated carbon fiber/TiO 2 cathode for the photoelectro-Fenton treatment of pharmaceutical pollutant enalapril. CHEMOSPHERE 2024; 353:141492. [PMID: 38387665 DOI: 10.1016/j.chemosphere.2024.141492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 02/15/2024] [Accepted: 02/16/2024] [Indexed: 02/24/2024]
Abstract
In this work, a TiO2-decorated electrode was fabricated by dip coating activated carbon fibers (ACF) with TiO2, which were then used as a cathode for the photoelectro-Fenton (PEF) treatment of the pharmaceutical enalapril, an angiotensin-converting enzyme inhibitor that has been detected in several waterways. The TiO2 coating was found to principally improve the electrocatalytic properties of ACF for H2O2 production via the 2-e- O2 reduction, in turn increasing enalapril degradation by PEF. The effect of the current density on the mineralization of enalapril was evaluated and the highest TOC removal yield (80.5% in 3 h) was obtained at 8.33 mA cm-2, in the presence of 0.5 mmol L-1 of Fe2+ catalyst. Under those conditions, enalapril was totally removed within the first 10 min of treatment with a rate constant k = 0.472 min-1. In contrast, uncoated ACF only achieved 60% of TOC removal in 3 h at 8.33 mA cm-2. A degradation pathway for enalapril mineralization is proposed, based on the degradation by-products identified during treatment. Overall, the results demonstrate the promises of TiO2 cathodes for PEF, a strategy that has often been overlooked in favor of photoelectrocatalysis (PEC) based on TiO2-modified photoanodes.
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Affiliation(s)
- Hugo Olvera-Vargas
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; Instituto de Energías Renovables, Universidad Nacional Autónoma de México (IER-UNAM), Priv. Xochicalco S/N, Col. Centro, Temixco, Morelos, 62580, Mexico.
| | - Suthan Selvam
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore
| | - Rishikesh Veer
- Water Sanitation and Hygiene Laboratory, BITS Pilani, KK Birla Goa Campus, NH 17 B, Zuarinagar, Goa, 403726, India
| | - Orlando García-Rodríguez
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; NUS Environmental Research Institute, National University of Singapore, #02-03, T-Lab Building 5A Engineering Drive 1, 117411, Singapore
| | - Srikanth Mutnuri
- Water Sanitation and Hygiene Laboratory, BITS Pilani, KK Birla Goa Campus, NH 17 B, Zuarinagar, Goa, 403726, India
| | - Olivier Lefebvre
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore; NUS Environmental Research Institute, National University of Singapore, #02-03, T-Lab Building 5A Engineering Drive 1, 117411, Singapore.
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2
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Ramírez-Valencia LD, Bailón-García E, Moral-Rodríguez AI, Carrasco-Marín F, Pérez-Cadenas AF. Carbon Gels-Green Graphene Composites as Metal-Free Bifunctional Electro-Fenton Catalysts. Gels 2023; 9:665. [PMID: 37623120 PMCID: PMC10454076 DOI: 10.3390/gels9080665] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/09/2023] [Accepted: 08/16/2023] [Indexed: 08/26/2023] Open
Abstract
The Electro-Fenton (EF) process has emerged as a promising technology for pollutant removal. However, the EF process requires the use of two catalysts: one acting as an electrocatalyst for the reduction of oxygen to H2O2 and another Fenton-type catalyst for the generation of ·OH radicals from H2O2. Thus, the search for materials with bifunctionality for both processes is required for a practical and real application of the EF process. Thus, in this work, bifunctional electrocatalysts were obtained via doping carbon microspheres with Eco-graphene, a form of graphene produced using eco-friendly methods. The incorporation of Eco-graphene offers numerous advantages to the catalysts, including enhanced conductivity, leading to more efficient electron transfer during the Electro-Fenton process. Additionally, the synthesis induced structural defects that serve as active sites, promoting the direct production of hydroxyl radicals via a 3-electron pathway. Furthermore, the spherical morphology of carbon xerogels enhances the accessibility of the reagents to the active sites. This combination of factors results in the effective degradation of Tetracycline (TTC) using metal-free catalysts in the Electro-Fenton process, achieving up to an impressive 83% degradation without requiring any other external or additional catalyst.
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Affiliation(s)
- Lilian D. Ramírez-Valencia
- Materiales Polifuncionales Basados en Carbono (UGR-Carbon), Dpto. Química Inorgánica-Unidad de Excelencia Química Aplicada a Biomedicina y Medioambiente-Universidad de Granada (UEQ-UGR), ES18071 Granada, Spain; (E.B.-G.); (A.I.M.-R.); (F.C.-M.)
| | | | | | | | - Agustín F. Pérez-Cadenas
- Materiales Polifuncionales Basados en Carbono (UGR-Carbon), Dpto. Química Inorgánica-Unidad de Excelencia Química Aplicada a Biomedicina y Medioambiente-Universidad de Granada (UEQ-UGR), ES18071 Granada, Spain; (E.B.-G.); (A.I.M.-R.); (F.C.-M.)
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Deng F, Olvera-Vargas H, Zhou M, Qiu S, Sirés I, Brillas E. Critical Review on the Mechanisms of Fe 2+ Regeneration in the Electro-Fenton Process: Fundamentals and Boosting Strategies. Chem Rev 2023; 123:4635-4662. [PMID: 36917618 DOI: 10.1021/acs.chemrev.2c00684] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
This review presents an exhaustive overview on the mechanisms of Fe3+ cathodic reduction within the context of the electro-Fenton (EF) process. Different strategies developed to improve the reduction rate are discussed, dividing them into two categories that regard the mechanistic feature that is promoted: electron transfer control and mass transport control. Boosting the Fe3+ conversion to Fe2+ via electron transfer control includes: (i) the formation of a series of active sites in both carbon- and metal-based materials and (ii) the use of other emerging strategies such as single-atom catalysis or confinement effects. Concerning the enhancement of Fe2+ regeneration by mass transport control, the main routes involve the application of magnetic fields, pulse electrolysis, interfacial Joule heating effects, and photoirradiation. Finally, challenges are singled out, and future prospects are described. This review aims to clarify the Fe3+/Fe2+ cycling process in the EF process, eventually providing essential ideas for smart design of highly effective systems for wastewater treatment and valorization at an industrial scale.
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Affiliation(s)
- Fengxia Deng
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China.,Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Ciència de Materials i Química Física, Secció de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Hugo Olvera-Vargas
- Instituto de Energías Renovables, Universidad Nacional Autónoma de México (IER-UNAM), Priv. Xochicalco S/N, Col. Centro, Temixco, Morelos CP 62580, México
| | - Minghua Zhou
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, P. R. China
| | - Shan Qiu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China
| | - Ignasi Sirés
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Ciència de Materials i Química Física, Secció de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Enric Brillas
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Ciència de Materials i Química Física, Secció de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
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4
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Brillas E. Progress of homogeneous and heterogeneous electro-Fenton treatments of antibiotics in synthetic and real wastewaters. A critical review on the period 2017-2021. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 819:153102. [PMID: 35041950 DOI: 10.1016/j.scitotenv.2022.153102] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 01/09/2022] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
Antibiotics are widely supplied over all the world to animals and humans to fight and heal bacteriological diseases. The uptake of antibiotics has largely increased the average-life expectancy of living beings. However, these recalcitrant products have been detected at low concentrations in natural waters, with potential health risks due to alterations in food chains and an increase in the resistance to bacterial infection, control of infectious diseases, and damage of the beneficial bacteria. The high stability of antibiotics at mild conditions prevents their effective removal in conventional wastewater treatment plants. A powerful advanced oxidation processes such as the electro-Fenton (EF) process is being developed as a guarantee for their destruction by •OH generated as strong oxidant. This review presents a critical, exhaustive, and detailed analysis on the application of EF to remediate synthetic and real wastewaters contaminated with common antibiotics, covering the period 2017-2021. Homogeneous EF and heterogeneous EF involving iron solid catalysts or iron functionalized cathodes, as well as their hybrid and sequential treatments, are exhaustively examined. Their fundamentals and characteristics are detailed, and the main results obtained for the removal of the most used antibiotic families are carefully described and discussed. The role of generated oxidizing agents is explained, and the by-products generated, and reaction sequences proposed are detailed.
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Affiliation(s)
- Enric Brillas
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Secció de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
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Melin V, Salgado P, Thiam A, Henríquez A, Mansilla HD, Yáñez J, Salazar C. Study of degradation of amitriptyline antidepressant by different electrochemical advanced oxidation processes. CHEMOSPHERE 2021; 274:129683. [PMID: 33540303 DOI: 10.1016/j.chemosphere.2021.129683] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 01/10/2021] [Accepted: 01/15/2021] [Indexed: 06/12/2023]
Abstract
Amitriptyline (AMT) is the most widely used tricyclic antidepressant and is classified as a recalcitrant emergent contaminant because it has been detected in different sources of water. Its accumulation in water and soil represents a risk for different living creatures. To remove amitriptyline from wastewater, the Advanced Oxidation Processes (AOPs) stands up as an interesting option since generate highly oxidized species as hydroxyl radicals (OH) by environmentally friendly mechanism. In this work, the oxidation and mineralization of AMT solution have been comparatively studied by 3 Electrochemical AOPs (EAOPs) where the OH is produced by anodic oxidation of H2O (AO-H2O2), or by electro-Fenton (EF) or photoelectro-Fenton (PEF). PEF process with a BDD anode showed the best performance for degradation and mineralization of this drug due to the synergistic action of highly reactive physiosorbed BDD (OH), homogeneous OH and UVA radiation. This process achieved total degradation of AMT at 50 min of electrolysis and 95% of mineralization after 360 min of treatment with 0.5 mmol L-1 Fe2+ at 100 mA cm-2. Six aromatic intermediates for the drug mineralization were identified in short time of electrolysis by GC-MS, including a chloroaromatic by-product formed from the attack of active chlorine. Short-chain carboxylic acids like succinic, malic, oxalic and formic acid were quantified by ion-exclusion HPLC. Furthermore, the formation of NO3- ions was monitored. Finally, the organic intermediates identified by chromatographic techniques were used to propose the reaction sequence for the total mineralization of AMT.
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Affiliation(s)
- Victoria Melin
- Laboratorio de Química Verde, Departamento de Química Analítica e Inorgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Concepción, Chile
| | - Pablo Salgado
- Laboratorio de Procesos Químicos Aplicados, Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad Católica de La Santísima Concepción, Alonso de Ribera 2850, Concepción, Chile
| | - Abdoulaye Thiam
- Programa Institucional de Fomento a La Investigación, Desarrollo e Innovación (PIDi), Universidad Tecnológica Metropolitana, Santiago, Chile
| | - Adolfo Henríquez
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile; Laboratorio de Investigaciones Medioambientales de Zonas Áridas, LIMZA, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile
| | - Héctor D Mansilla
- Laboratorio de Química Orgánica Ambiental, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Concepción, Chile
| | - Jorge Yáñez
- Laboratorio de Trazas Elementales y Especiación, Departamento de Química Analítica e Inorgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 129, Concepción, Chile
| | - Claudio Salazar
- Laboratorio de Procesos Químicos Aplicados, Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad Católica de La Santísima Concepción, Alonso de Ribera 2850, Concepción, Chile.
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Olvera-Vargas H, Dubuc J, Wang Z, Coudert L, Neculita CM, Lefebvre O. Electro-Fenton beyond the Degradation of Organics: Treatment of Thiosalts in Contaminated Mine Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:2564-2574. [PMID: 33502180 DOI: 10.1021/acs.est.0c06006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Electro-Fenton (EF) is an emerging technology with well-known outstanding oxidation power; yet, its application to the treatment of inorganic contaminants has been largely disregarded. Thiosalts are contaminants of emerging concern in mine water, responsible for delayed acidity in natural waterways. In this study, EF was used to treat thiosalts in synthetic and real mine water. Thiosulfate (S2O32-) solutions were first used to optimize the main parameters affecting the process, namely, the current density (2.08-6.25 mA cm-2), temperature (4 vs 20 °C), and S2O32- concentration (0.25-2 g L-1). S2O32- was almost completely removed in 2 h of treatment at 6.25 mA cm-2, while temperature played no important role in the process efficiency. The optimal conditions were then applied to treat a real sample of contaminated mine water, resulting in complete S2O32- and S4O62- oxidation to SO42- in 90 min at 6.25 mA cm-2 (95% removal in only 60 min). The reaction mechanisms were investigated in detail based on the quantification of the main degradation byproducts. This study opens new possibilities for EF application to the treatment of thiosalt-contaminated mine water and other oxidizable inorganic-impacted wastewaters.
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Affiliation(s)
- Hugo Olvera-Vargas
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore 117576, Singapore
- Instituto de Energías Renovables, Universidad Nacional Autónoma de México (IER-UNAM), Priv. Xochicalco S/N, Col. Centro, Temixco, Morelos 62580, Mexico
| | - Jennifer Dubuc
- Research Institute of Mines and Environment (RIME), University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec J9X 5E4, Canada
| | - Zuxin Wang
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore 117576, Singapore
| | - Lucie Coudert
- Research Institute of Mines and Environment (RIME), University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec J9X 5E4, Canada
| | - Carmen Mihaela Neculita
- Research Institute of Mines and Environment (RIME), University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec J9X 5E4, Canada
| | - Olivier Lefebvre
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore 117576, Singapore
- Research Institute of Mines and Environment (RIME), University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec J9X 5E4, Canada
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Wang Z, Pi L, Cui J, Zhang X, Liu Y, Tang D, Zhu H, Mao X. Heterogeneous Electro-Fenton system for efficient degradation of 2,4-DCP: Dual activation of O2 for H2O2 generation and oxygen-defect cobalt ferrite catalysts. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117731] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Deng F, Olvera-Vargas H, Garcia-Rodriguez O, Qiu S, Ma F, Chen Z, Lefebvre O. Unconventional electro-Fenton process operating at a wide pH range with Ni foam cathode and tripolyphosphate electrolyte. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122641. [PMID: 32339874 DOI: 10.1016/j.jhazmat.2020.122641] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 03/26/2020] [Accepted: 04/02/2020] [Indexed: 06/11/2023]
Abstract
We propose an unconventional electro-Fenton (EF) system with a nickel-foam (Ni-F) cathode and tripolyphosphate (3-PP) electrolyte at near-neutral pH (EF/Ni-F-3-PP) to overcome pH restrictions in EF while preventing Ni-F corrosion. Response surface modelling was used to optimize the main operating parameters with a model prediction analysis (R2 = 0.99): pH = 5.8, Fe2+ = 3.0 mM and applied current = 349.6 mA. Among the three variables, the pH exerted the highest influence on the process. Under optimal conditions, 100 % of phenol removal was achieved in 25 min with a pseudo-first-order apparent rate constant (kapp) of 0.2 min-1, 3.2-fold higher than the kapp of EF/Ni-F with SO42- electrolyte at pH 3. A mineralization yield of 81.5 % was attained after 2 h; furthermore, it was found that 3-PP enhanced H2O2 accumulation by preventing bulk H2O2 decomposition. Finally, toxicity evaluation revealed the formation of toxic by-products at the early stages of treatment, which were totally depleted after 2 h, demonstrating the detoxifying capacity of the system. In conclusion, this study shows for the first time the potential of Ni-F as a cathode for EF under near-neutral conditions, rendered possible by the 3PP electrolyte. Under these conditions, the Ni-F corrosion issue could be alleviated.
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Affiliation(s)
- Fengxia Deng
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore; State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Hugo Olvera-Vargas
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore
| | - Orlando Garcia-Rodriguez
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore
| | - Shan Qiu
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Fang Ma
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Zhonglin Chen
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Olivier Lefebvre
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore.
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Liu F, Oturan N, Zhang H, Oturan MA. Soil washing in combination with electrochemical advanced oxidation for the remediation of synthetic soil heavily contaminated with diesel. CHEMOSPHERE 2020; 249:126176. [PMID: 32087453 DOI: 10.1016/j.chemosphere.2020.126176] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 02/01/2020] [Accepted: 02/09/2020] [Indexed: 06/10/2023]
Abstract
Sequential soil washing and electrochemical advanced oxidation processes (EAOPs) were applied for the remediation of synthetic soil contaminated with diesel. The surfactant Tween 80 was used to enhance the extraction of diesel from synthetic soil, and diesel extraction efficiency was improved with the increase of Tween 80 concentration. Under conditions of 180 min washing time, 10 g synthetic soil with 100 mL surfactant solution and two times of soil washing, about 75.2%, 80.0% and 87.9% of diesel was extracted from synthetic soil with 5.0, 7.5 and 10.0 g L-1 Tween 80. The degradation of diesel in soil washing effluent was carried out by two EAOPs, electro-oxidation (EO) and electro-Fenton (EF) using boron-doped diamond (BDD) anode and carbon felt cathode cell. After 360 min EO treatment, 72.7-83.0% of diesel was removed from the effluent after soil washing with 5.0-10.0 g L-1 Tween 80 while higher removal efficiencies (77.7-87.2%) were attained with EF process. Parallel factor analysis (PARAFAC) of excitation emission matrix (EEM) fluorescence spectroscopy was conducted to analysis the transformation of fluorescent components in diesel during the treatment by two EAOPs.
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Affiliation(s)
- Fuzhen Liu
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China; Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France
| | - Nihal Oturan
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France
| | - Hui Zhang
- Department of Environmental Science and Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China.
| | - Mehmet A Oturan
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 5 Bd. Descartes, 77454, Marne-la-Vallée Cedex 2, France.
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Deng F, Qiu S, Zhu Y, Zhang X, Yang J, Ma F. Tripolyphosphate-assisted electro-Fenton process for coking wastewater treatment at neutral pH. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:11928-11939. [PMID: 30825125 DOI: 10.1007/s11356-019-04548-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
The first application of a novel electro-Fenton (EF) for coking wastewater (CW) treatment at the original pH (6.80) by using tripolyphosphate (TPP) ligand was proposed. Total organic carbon (TOC) decay of CW followed a pseudo-first kinetic rate constant with an apparent rate constant (kapp) of 1.07 × 10-2 min-1 for the EF in the presence of TPP (EF/TPP), which was 2.10 times higher than that of conventional EF (kapp = 5.10 × 10-3 min-1) working at pH 3. The high efficiency of EF/TPP at neutral pH was mainly attributed to the newly formed Fe-O-P coordination in the iron-ligand compound (Fe2+-TPP) supported by UV-absorption spectra results, activating oxygen to produce •OH and hence enhancing the oxidation capacity. Key operating parameters of CW mineralization by EF/TPP including Fe2+ concentration and pH value were systematically investigated. Excitation-emission matrix (EEM) spectra technique was used to assess the variance of dissolved organic matters during the EF/TPP process. Results showed an 81% mineralization of CW after 3 h electrolysis coupled with a low energy consumption (0.129 kWh g-1 TOC) which were obtained by the EF/TPP process. Microtox toxicity demonstrated that TPP could reduce the toxicity of raw CW and importantly, it showed that EF/TPP was effective for detoxification. Mechanism study via simulated matrix with similar components as CW revealed that •OH produced both from Fenton and Fe2+-TPP activation together with the generated active chlorine was responsible for CW mineralization. In summary, the TPP-assisted EF process was presented as a promising technique for extending coking wastewater treatment at near-neutral pH with a high mineralization.
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Affiliation(s)
- Fengxia Deng
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China
| | - Shan Qiu
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
| | - Yingshi Zhu
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China
| | - Xiaoxiao Zhang
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China
| | - Jixian Yang
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
| | - Fang Ma
- State Key Laboratory of Urban Water Resources Centre, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China
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