651
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Zhang G, Ren J, Liu B, Tian M, Zhou H, Zhao J. In situ hydrothermal preparation and photocatalytic desulfurization performance of metallophthalocyanine sensitized SnO2. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.12.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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652
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He Y, Wang X, Huang W, Chen R, Zhang W, Li H, Lin H. Hydrophobic networked PbO 2 electrode for electrochemical oxidation of paracetamol drug and degradation mechanism kinetics. CHEMOSPHERE 2018; 193:89-99. [PMID: 29127839 DOI: 10.1016/j.chemosphere.2017.10.144] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 10/24/2017] [Accepted: 10/25/2017] [Indexed: 06/07/2023]
Abstract
A hydrophobic networked PbO2 electrode was deposited on mesh titanium substrate and utilized for the electrochemical elimination towards paracetamol drug. Three dimensional growth mechanism of PbO2 layer provided more loading capacity of active materials and network structure greatly reduced the mass transfer for the electrochemical degradation. The active electrochemical surface area based on voltammetric charge quantity of networked PbO2 electrode is about 2.1 times for traditional PbO2 electrode while lower charge transfer resistance (6.78 Ω cm2) could be achieved on networked PbO2 electrode. The electrochemical incineration kinetics of paracetamol drug followed a pseudo first-order behavior and the corresponding rate constant were 0.354, 0.658 and 0.880 h-1 for traditional, networked PbO2 and boron doped diamond electrode. Higher electrochemical elimination kinetics could be achieved on networked PbO2 electrode and the performance can be equal to boron doped diamond electrode in result. Based on the quantification of reactive oxidants (hydroxyl radicals), the utilization rate of hydroxyl radicals could reach as high as 90% on networked PbO2 electrode. The enhancement of excellent electrochemical oxidation capacity towards paracetamol drug was related to the properties of higher loading capacity, enhanced mass transfer and hydrophobic surface. The possible degradation mechanism and pathway of paracetamol on networked PbO2 electrode were proposed in details accordingly based on the intermediate products.
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Affiliation(s)
- Yapeng He
- College of Chemistry, Jilin University, Changchun 130012, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
| | - Xue Wang
- Faculty of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, China
| | - Weimin Huang
- College of Chemistry, Jilin University, Changchun 130012, China.
| | - Rongling Chen
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Wenli Zhang
- College of Chemistry, Jilin University, Changchun 130012, China
| | - Hongdong Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Haibo Lin
- College of Chemistry, Jilin University, Changchun 130012, China; Guangdong Guanghua Sci-Tech Co., Ltd., Shantou 515061, China.
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653
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Cotillas S, Llanos J, Cañizares P, Clematis D, Cerisola G, Rodrigo MA, Panizza M. Removal of Procion Red MX-5B dye from wastewater by conductive-diamond electrochemical oxidation. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.01.052] [Citation(s) in RCA: 89] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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654
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Herrada RA, Acosta-Santoyo G, Sepúlveda-Guzmán S, Brillas E, Sirés I, Bustos E. IrO2-Ta2O5|Ti electrodes prepared by electrodeposition from different Ir:Ta ratios for the degradation of polycyclic aromatic hydrocarbons. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.01.056] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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655
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Duan T, Ma L, Chen Y, Ma X, Hou J, Lin C, Sun M. Morphology-dependent activities of TiO2-NTs@Sb-SnO2 electrodes for efficient electrocatalytic methyl orange decolorization. J Solid State Electrochem 2018. [DOI: 10.1007/s10008-018-3895-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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656
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Reipa V, Atha DH, Coskun SH, Sims CM, Nelson BC. Controlled potential electro-oxidation of genomic DNA. PLoS One 2018; 13:e0190907. [PMID: 29324786 PMCID: PMC5764341 DOI: 10.1371/journal.pone.0190907] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 12/21/2017] [Indexed: 12/12/2022] Open
Abstract
Exposure of mammalian cells to oxidative stress can result in DNA damage that adversely affects many cell processes. Lack of dependable DNA damage reference materials and standardized measurement methods, despite many case-control studies hampers the wider recognition of the link between oxidatively degraded DNA and disease risk. We used bulk electrolysis in an electrochemical system and gas chromatographic mass spectrometric analysis (GC/MS/MS) to control and measure, respectively, the effect of electrochemically produced reactive oxygen species on calf thymus DNA (ct-DNA). DNA was electro-oxidized for 1 h at four fixed oxidizing potentials (E = 0.5 V, 1.0 V, 1.5 V and 2 V (vs Ag/AgCl)) using a high surface area boron-doped diamond (BDD) working electrode (WE) and the resulting DNA damage in the form of oxidatively-modified DNA lesions was measured using GC/MS/MS. We have shown that there are two distinct base lesion formation modes in the explored electrode potential range, corresponding to 0.5 V < E < 1.5 V and E > 1.5 V. Amounts of all four purine lesions were close to a negative control levels up to E = 1.5 V with evidence suggesting higher levels at the lowest potential of this range (E = 0.5 V). A rapid increase in all base lesion yields was measured when ct-DNA was exposed at E = 2 V, the potential at which hydroxyl radicals were efficiently produced by the BDD electrode. The present results demonstrate that controlled potential preparative electrooxidation of double-stranded DNA can be used to purposely increase the levels of oxidatively modified DNA lesions in discrete samples. It is envisioned that these DNA samples may potentially serve as analytical control or quality assurance reference materials for the determination of oxidatively induced DNA damage.
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Affiliation(s)
- Vytas Reipa
- Materials Measurement Laboratory, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, United States of America
- * E-mail:
| | - Donald H. Atha
- Materials Measurement Laboratory, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, United States of America
| | - Sanem H. Coskun
- Materials Measurement Laboratory, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, United States of America
| | - Christopher M. Sims
- Materials Measurement Laboratory, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, United States of America
| | - Bryant C. Nelson
- Materials Measurement Laboratory, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, United States of America
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657
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Bouzayani B, Bocos E, Elaoud SC, Pazos M, Sanromán MÁ, González-Romero E. An effective electroanalytical approach for the monitoring of electroactive dyes and intermediate products formed in electro-Fenton treatment. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.06.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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658
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659
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Cotillas S, Lacasa E, Sáez C, Cañizares P, Rodrigo MA. Electrolytic and electro-irradiated technologies for the removal of chloramphenicol in synthetic urine with diamond anodes. WATER RESEARCH 2018; 128:383-392. [PMID: 29126034 DOI: 10.1016/j.watres.2017.10.072] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 10/21/2017] [Accepted: 10/31/2017] [Indexed: 06/07/2023]
Abstract
Hospital effluents are a major source for the occurrence of pharmaceuticals in the environment. In this work, the treatment of synthetic urine polluted with chloramphenicol is studied by using three different conductive-diamond electrochemical oxidation technologies: electrolysis (single electrolysis), photoelectrolysis and high-frequency ultrasound sonoelectrolysis. These technologies were evaluated at 10 and 100 mA cm-2. Results shows that not only chloramphenicol but also other organics contained in urine are completely mineralized by electrolysis. Ammonium is the main inorganic nitrogen species formed and it can react with the electrogenerated hypochlorite, favouring the formation of chloramines. These species prevent the potential formation of perchlorate from chlorides contained in urine at low current densities (10 mA cm-2) and delay its occurrence at high current densities (100 mA cm-2). On the other hand, irradiation of ultraviolet (UV) light or high-frequency ultrasound (US) produce changes in the performance of the electrolytic treatment, but these changes are not as important as in other cases of study shown in the literature. Nonetheless, the effect of electroirradiated technologies seems to be higher and depends on the type of pollutant when working at low current densities (10 mA cm-2). It is positive in the case of the degradation of the antibiotic and the uric acid and negative in the case of urea where there is a clear antagonistic effect. Production of oxidants increases with the current density although in lower ratio than expected. These results are of great importance because clearly point out that electrolytic technologies can be applied to minimize the diffuse pollution associated to pharmaceuticals before discharge into municipal sewers.
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Affiliation(s)
- Salvador Cotillas
- Department of Chemical Engineering, School of Industrial Engineering, University of Castilla-La Mancha, 02071, Albacete, Spain
| | - Engracia Lacasa
- Department of Chemical Engineering, School of Industrial Engineering, University of Castilla-La Mancha, 02071, Albacete, Spain
| | - Cristina Sáez
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, 13005, Ciudad Real, Spain
| | - Pablo Cañizares
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, 13005, Ciudad Real, Spain
| | - Manuel A Rodrigo
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, 13005, Ciudad Real, Spain.
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660
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Zhao Q, Liu Y. Macrocycle crosslinked mesoporous polymers for ultrafast separation of organic dyes. Chem Commun (Camb) 2018; 54:7362-7365. [DOI: 10.1039/c8cc04080j] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Mesoporous polymers were synthesized by interfacial polymerization of macrocycles (sulfonatocalix[4]arenes and pillar[5]arenes) and terephthaloyl chloride.
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Affiliation(s)
- Qian Zhao
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University
- Tianjin 300071
- P. R. China
| | - Yu Liu
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University
- Tianjin 300071
- P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University
- Tianjin 300072
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661
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Lopes da Silva AR, Jhones dos Santos A, Martínez-Huitle CA. Electrochemical measurements and theoretical studies for understanding the behavior of catechol, resorcinol and hydroquinone on the boron doped diamond surface. RSC Adv 2018; 8:3483-3492. [PMID: 35542960 PMCID: PMC9077693 DOI: 10.1039/c7ra12257h] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/08/2018] [Indexed: 12/04/2022] Open
Abstract
Using electrochemical techniques (cyclic voltammetry (CV) and differential pulse voltammetry (DPV)) with a boron-doped diamond (BDD) electrode it was possible to study the behavior of hydroquinone (HQ), catechol (CT) and resorcinol (RS), in aqueous solutions as well as to associate the electrochemical profiles with computational simulations. It led to understanding the factors that influence the direct electrooxidation of HQ, CT and RS on the BDD surface. Theoretical calculations demonstrated that the compounds with lower HOMO energy and high ionization potential (IP) are more stable, showing a higher Epa, denoting that HOMO energies and IP are related to the difficulty of oxidizing (losing an electron) a specific compound. Analyzing the electro-oxidation reactions of HQ, CT and RS by using computational calculations, it was possible to verify the reversibility behavior, direct oxidation pathway and the possible intermediates formed during electron-transfer. The results clearly demonstrated that the reversibility was attained for HQ and CT, while this behavior is not feasible, thermodynamically speaking, for RS and this was confirmed by DFT calculations. For direct oxidation mechanisms, HQ and CT are quickly oxidized, but RS produces stable intermediates. These experimental and theoretical results also explain the behavior when the compounds were analyzed by electroanalytical techniques, suggesting that the interactions by direct electron-transfer determine the stability of response (sensitivity) as well as the limit of detection. The results are described and discussed in light of the existing literature. Using electrochemical techniques it was possible to study the behavior of hydroquinone, catechol and resorcinol, at boron doped diamond surface in aqueous solutions as well as to associate the electrochemical profiles with computational simulations.![]()
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Affiliation(s)
- Amison Rick Lopes da Silva
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA)
- Institute of Chemistry
- Federal University of Rio Grande do Norte
- Natal
- Brazil
| | - Alexsandro Jhones dos Santos
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA)
- Institute of Chemistry
- Federal University of Rio Grande do Norte
- Natal
- Brazil
| | - Carlos Alberto Martínez-Huitle
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA)
- Institute of Chemistry
- Federal University of Rio Grande do Norte
- Natal
- Brazil
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662
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663
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Santos JEL, Antonio Quiroz M, Cerro-Lopez M, de Moura DC, Martínez-Huitle CA. Evidence for the electrochemical production of persulfate at TiO2 nanotubes decorated with PbO2. NEW J CHEM 2018. [DOI: 10.1039/c7nj02604h] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aim of this work is to study the viability of using TiO2 nanotube arrays decorated with PbO2 to electrochemically produce persulfate
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Affiliation(s)
- José Eudes L. Santos
- Federal University of Rio Grande do Norte
- Institute of Chemistry
- Lagoa Nova – CEP 59.072-970
- Brazil
| | - Marco Antonio Quiroz
- Universidad de las Américas Puebla
- Grupo de Investigación en Energía y Ambiente
- ExHda
- Cholula 72820
- Mexico
| | - Monica Cerro-Lopez
- Universidad de las Américas Puebla
- Grupo de Investigación en Energía y Ambiente
- ExHda
- Cholula 72820
- Mexico
| | - Dayanne Chianca de Moura
- Federal University of Rio Grande do Norte
- Institute of Chemistry
- Lagoa Nova – CEP 59.072-970
- Brazil
| | - Carlos A. Martínez-Huitle
- Federal University of Rio Grande do Norte
- Institute of Chemistry
- Lagoa Nova – CEP 59.072-970
- Brazil
- UNESP
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664
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Jager D, Kupka D, Vaclavikova M, Ivanicova L, Gallios G. Degradation of Reactive Black 5 by electrochemical oxidation. CHEMOSPHERE 2018; 190:405-416. [PMID: 29024885 DOI: 10.1016/j.chemosphere.2017.09.126] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 09/25/2017] [Accepted: 09/26/2017] [Indexed: 06/07/2023]
Abstract
Degradation of commercial grade Reactive Black 5 (RB5) azo dye by chemical and electrochemical treatment was examined using a dimensionally stable anode and stainless steel cathodes as electrode materials, with NaCl as supporting electrolyte. The electrochemical treatment was compared to the chemical treatment with hypochlorite generated by electrolysis. The compounds present in the commercial grade RB5 azo dye and the products of its electrochemical degradation were separated using ion-pairing high performance liquid chromatography on reversed phase. The separated species were detected by diode array detector and electrospray ionization mass spectrometry. A suitable ion-pairing reversed phase HPLC-MS method with electrospray ionization for the separation and identification of the components was developed. The accurate mass of the parent and fragment ions were used in the determination of the empirical formulas of the components using the first-order mass spectra. Structural formulas of degradation products were proposed using these information and principles of organic chemistry and electrochemistry.
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Affiliation(s)
- David Jager
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Kosice, Slovakia
| | - Daniel Kupka
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Kosice, Slovakia
| | - Miroslava Vaclavikova
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Kosice, Slovakia.
| | - Lucia Ivanicova
- Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01, Kosice, Slovakia
| | - George Gallios
- Aristotle University of Thessaloniki, School of Chemistry, Lab. Chemical & Environmental Technology, University Campus, 54124, Thessaloniki, Greece
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665
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Morales U, Escudero CJ, Rivero MJ, Ortiz I, Rocha JM, Peralta-Hernández JM. Coupling of the electrochemical oxidation (EO-BDD)/photocatalysis (TiO2-Fe-N) processes for degradation of acid blue BR dye. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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666
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Gao Y, Zhang J, Bai X, You S. Monolithic ceramic electrode for electrochemical deactivation of Microcystis aeruginosa. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2017.10.127] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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667
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Zhang C, He D, Ma J, Tang W, Waite TD. Faradaic reactions in capacitive deionization (CDI) - problems and possibilities: A review. WATER RESEARCH 2018; 128:314-330. [PMID: 29107916 DOI: 10.1016/j.watres.2017.10.024] [Citation(s) in RCA: 239] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/07/2017] [Accepted: 10/09/2017] [Indexed: 05/04/2023]
Abstract
Capacitive deionization (CDI) is considered to be one of the most promising technologies for the desalination of brackish water with low to medium salinity. In practical applications, Faradaic redox reactions occurring in CDI may have both negative and positive effects on CDI performance. In this review, we present an overview of the types and mechanisms of Faradaic reactions in CDI systems including anodic oxidation of carbon electrodes, cathodic reduction of oxygen and Faradaic ion storage and identify their apparent negative and positive effects on water desalination. A variety of strategies including development of novel electrode materials and use of alternative configurations and/or operational modes are proposed for the purpose of mitigation or elimination of the deterioration of electrodes and the formation of byproducts caused by undesired side Faradaic reactions. It is also recognized that Faradaic reactions facilitate a variety of exciting new applications including i) the incorporation of intercalation electrodes to enhance water desalination or to selectively separate certain ions through reversible Faradaic reactions and ii) the use of particular anodic oxidation and cathodic reduction reactions to realize functions such as water disinfection and contaminant removal.
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Affiliation(s)
- Changyong Zhang
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Di He
- Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China; Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jinxing Ma
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Wangwang Tang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China.
| | - T David Waite
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
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668
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Yu F, Chen Y, Ma H. Ultrahigh yield of hydrogen peroxide and effective diclofenac degradation on a graphite felt cathode loaded with CNTs and carbon black: an electro-generation mechanism and a degradation pathway. NEW J CHEM 2018. [DOI: 10.1039/c7nj04925k] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new graphite felt cathode loaded with carbon nanotubes and carbon black was developed.
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Affiliation(s)
- Fangke Yu
- School of Environmental Science and Engineering
- Shaanxi University of Science and Technology
- Xi’an 710021
- China
| | - Yang Chen
- School of Environmental Science and Engineering
- Shaanxi University of Science and Technology
- Xi’an 710021
- China
| | - Hongrui Ma
- School of Environmental Science and Engineering
- Shaanxi University of Science and Technology
- Xi’an 710021
- China
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669
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Ridruejo C, Centellas F, Cabot PL, Sirés I, Brillas E. Electrochemical Fenton-based treatment of tetracaine in synthetic and urban wastewater using active and non-active anodes. WATER RESEARCH 2018; 128:71-81. [PMID: 29091806 DOI: 10.1016/j.watres.2017.10.048] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/18/2017] [Accepted: 10/21/2017] [Indexed: 06/07/2023]
Abstract
The electrochemical degradation of tetracaine hydrochloride has been studied in urban wastewater. Treatments in simulated matrix with similar ionic composition as well as in 0.050 M Na2SO4 were comparatively performed. The cell contained an air-diffusion cathode for H2O2 electrogeneration and an anode selected among active Pt, IrO2-based and RuO2-based materials and non-active boron-doped diamond (BDD). Electrochemical oxidation with electrogenerated H2O2 (EO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF) were comparatively assessed at pH 3.0 and constant current density. The pharmaceutical and its byproducts were oxidized by OH formed from water oxidation at the anode surface and in the bulk from Fenton's reaction, which occurred upon addition of 0.50 mM Fe2+ in all media, along with active chlorine originated from the anodic oxidation of Cl- contained in the simulated matrix and urban wastewater. The PEF process was the most powerful treatment regardless of the electrolyte composition, owing to the additional photolysis of intermediates by UVA radiation. The use of BDD led to greater mineralization compared to other anodes, being feasible the total removal of all organics from urban wastewater by PEF at long electrolysis time. Chlorinated products were largely recalcitrant when Pt, IrO2-based or RuO2-based anodes were used, whereas they were effectively destroyed by BDD(OH). Tetracaine decay always obeyed a pseudo-first-order kinetics, being slightly faster with the RuO2-based anode in Cl- media because of the higher amounts of active chlorine produced. Total nitrogen and concentrations of NH4+, NO3-, ClO3-, ClO4- and active chlorine were determined to clarify the behavior of the different electrodes in PEF. Eight intermediates were identified by GC-MS and fumaric and oxalic acids were quantified as final carboxylic acids by ion-exclusion HPLC, allowing the proposal of a plausible reaction sequence for tetracaine mineralization by PEF in Cl--containing medium.
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Affiliation(s)
- Carlota Ridruejo
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Francesc Centellas
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Pere L Cabot
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Ignasi Sirés
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament 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 Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.
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670
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Lanzarini-Lopes M, Garcia-Segura S, Hristovski K, Westerhoff P. Electrical energy per order and current efficiency for electrochemical oxidation of p-chlorobenzoic acid with boron-doped diamond anode. CHEMOSPHERE 2017; 188:304-311. [PMID: 28888118 DOI: 10.1016/j.chemosphere.2017.08.145] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 08/28/2017] [Accepted: 08/28/2017] [Indexed: 05/21/2023]
Abstract
Electrochemical oxidation (EO) is an advanced oxidation process for water treatment to mineralize organic contaminants. While proven to degrade a range of emerging pollutants in water, less attention has been given to quantify the effect of operational variables such applied current density and pollutant concentration on efficiency and energy requirements. Particular figures of merit were mineralization current efficiency (MCE) and electrical energy per order (EEO). Linear increases of applied current exponentially decreased the MCE due to the enhancement of undesired parasitic reactions that consumed generated hydroxyl radical. EEO values ranged from 39.3 to 331.8 kW h m-3 order-1. Increasing the applied current also enhanced the EEO due to the transition from kinetics limited by current to kinetics limited by mass transfer. Further increases in current did not influence the removal rate, but it raised the EEO requirement. The EEO requirement diminished when decreasing initial pollutant loading with the increase of the apparent kinetic rate because of the relative availability of oxidant per pollutant molecule in solution at a defined current. Oxidation by-products released were identified, and a plausible degradative pathway has been suggested.
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Affiliation(s)
- Mariana Lanzarini-Lopes
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, United States
| | - Sergi Garcia-Segura
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, United States
| | - Kiril Hristovski
- The Polytechnic School, Arizona State University, Mesa, AZ 85212, United States
| | - Paul Westerhoff
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, United States.
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671
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D'Angelo A, Tedesco M, Cipollina A, Galia A, Micale G, Scialdone O. Reverse electrodialysis performed at pilot plant scale: Evaluation of redox processes and simultaneous generation of electric energy and treatment of wastewater. WATER RESEARCH 2017; 125:123-131. [PMID: 28843152 DOI: 10.1016/j.watres.2017.08.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 07/24/2017] [Accepted: 08/03/2017] [Indexed: 06/07/2023]
Abstract
This paper describes the experimental campaign carried out with a reverse electrodialysis (RED) demonstration plant (Marsala, Italy) with the main aims of: (i) evaluating the effect of various operating parameters, including the redox processes, on the system performances; (ii) using the plant for the simultaneous generation of electric energy and treatment of wastewater. The prototype (44 × 44 cm2, 500 cell pairs) was tested using both real (brackish water and brine) and artificial solutions. Tests with two different electrode rinse solutions (with or without iron redox couples) were performed. In agreement with the data obtained in the laboratory, the presence of iron ions contributes positively to the power production. The effect of flow rates in the electrode and saline compartments, as well as aging of the electrode rinse solution was also investigated. The possibility to remove an organic pollutant (the azoic dye Acid Orange 7) from the electrode solution was tested, obtaining a very fast and total removal of the pollutant. This experimental campaign represents the first demonstration in a real environment of the abilities of a RED plant to treat wastewater, thus giving useful indications for the spreading of RED technology in the near future.
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Affiliation(s)
- Adriana D'Angelo
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy
| | - Michele Tedesco
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy; Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, The Netherlands
| | - Andrea Cipollina
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy
| | - Alessandro Galia
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy
| | - Giorgio Micale
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy
| | - Onofrio Scialdone
- Dipartimento dell'Innovazione Industriale e Digitale, Ingegneria Chimica, Gestionale, Informatica, Meccanica, Universitá di Palermo (UNIPA), Viale delle Scienze Ed.6, 90128 Palermo, Italy.
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672
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da Costa Soares IC, da Silva DR, do Nascimento JHO, Garcia-Segura S, Martínez-Huitle CA. Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:24167-24176. [PMID: 28884274 DOI: 10.1007/s11356-017-0041-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Accepted: 08/25/2017] [Indexed: 06/07/2023]
Abstract
Electrochemical water treatment technologies are highly promising to achieve complete decolorization of dyebath effluents, as demonstrated by several studies reported in the literature. However, these works are focused on the treatment of one model pollutant and generalize the performances of the processes which are not transposable since they depend on the pollutant treated. Thus, in the present study, we evaluate, for the first time, the influence of different functional groups that modify the dye structure on the electrochemical process decolorization performance. The textile azo dyes Reactive Orange 16, Reactive Violet 4, Reactive Red 228, and Reactive Black 5 have been selected because they present the same molecular basis structure with different functional groups. The results demonstrate that the functional groups that reduce the nucleophilicity of the pollutant hinder the electrophilic attack of electrogenerated hydroxyl radical. Thereby, the overall decolorization efficiency is consequently reduced as well as the decolorization rate. Moreover, the presence of an additional chromophore azo bond in the molecule enhances the recalcitrant character of the azo dyes as pollutants. The formation of a larger and more stable conjugated π system increases the activation energy required for the electrophyilic attack of •OH, affecting the performance of electrochemical technologies on effluent decolorization.
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Affiliation(s)
- Izabelle Cristina da Costa Soares
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA), Institute of Chemistry, Federal University of Rio Grande do Norte, Lagoa Nova, CEP, Natal, RN, 59078-970, Brazil
| | - Djalma Ribeiro da Silva
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA), Institute of Chemistry, Federal University of Rio Grande do Norte, Lagoa Nova, CEP, Natal, RN, 59078-970, Brazil
| | | | - Sergi Garcia-Segura
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA), Institute of Chemistry, Federal University of Rio Grande do Norte, Lagoa Nova, CEP, Natal, RN, 59078-970, Brazil.
| | - Carlos Alberto Martínez-Huitle
- Laboratório de Eletroquímica Ambiental e Aplicada (LEAA), Institute of Chemistry, Federal University of Rio Grande do Norte, Lagoa Nova, CEP, Natal, RN, 59078-970, Brazil.
- National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, Unesp, P.O. Box 355, Araraquara, SP, 14800-900, Brazil.
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673
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Sakthivel R, Palanisamy S, Chen SM, Ramaraj S, Velusamy V, Yi-Fan P, Hall JM, Ramaraj SK. A robust nitrobenzene electrochemical sensor based on chitin hydrogel entrapped graphite composite. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.08.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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674
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Muñoz-Morales M, Braojos M, Sáez C, Cañizares P, Rodrigo MA. Remediation of soils polluted with lindane using surfactant-aided soil washing and electrochemical oxidation. JOURNAL OF HAZARDOUS MATERIALS 2017; 339:232-238. [PMID: 28654787 DOI: 10.1016/j.jhazmat.2017.06.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 06/07/2017] [Accepted: 06/10/2017] [Indexed: 06/07/2023]
Abstract
In this work the complete treatment of soil spiked with lindane is studied using surfactant-aided soil-washing (SASW) to exhaust lindane from soil and electrolysis with diamond anodes to mineralize lindane from the soil washing fluid (SWF) waste. Results demonstrated that this technological approach is efficient and allow to remove this hazardous pollutant from soil. They also pointed out the significance of the ratio surfactant/soil in the efficiency of the SASW process and in the performance of the later electrolysis used to mineralize the pollutant. Larger values of this parameter lead to effluents that undergo a very efficient treatment which allows the depletion of lindane for applied charges lower than 15AhL-1 and the recovery of more than 70% of the surfactant for the regeneration of the SWF.
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Affiliation(s)
- M Muñoz-Morales
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13005, Ciudad Real, Spain
| | - M Braojos
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13005, Ciudad Real, Spain
| | - C Sáez
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13005, Ciudad Real, Spain
| | - P Cañizares
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13005, Ciudad Real, Spain
| | - M A Rodrigo
- Department of Chemical Engineering, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Campus Universitario s/n, 13005, Ciudad Real, Spain.
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675
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Ibrahim FA, Al-Ghobashy MA, Abd El-Rahman MK, Abo-Elmagd IF. Optimization and in line potentiometric monitoring of enhanced photocatalytic degradation kinetics of gemifloxacin using TiO 2 nanoparticles/H 2O 2. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:23880-23892. [PMID: 28871503 DOI: 10.1007/s11356-017-0045-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 08/28/2017] [Indexed: 06/07/2023]
Abstract
Gemifloxacin (GEM) is a broad-spectrum quinolone antibiotic. The presence of GEM residuals in industrial and hospital wastewater has been associated with genotoxicity and antibiotic resistance. In this contribution, the photodegradation of GEM using titanium dioxide nanoparticles (TiO2NPs)/H2O2 as a catalyst was optimized to eliminate residual drug and its photodegradates with antibacterial activity. A half-factorial design was implemented, investigating the effects of pH, initial concentration, H2O2 concentration, TiO2NP loading, and irradiation time. Owing to the time-dependent, multi-transformation of GEM into a wide range of structurally related photodegradation products, the monitoring of GEM throughout the experiments was achieved using both HPLC and potentiometric ion-selective electrodes (ISE). The sensor enabled in-line tracking of residual GEM in the presence of its photodegradates in real time. Results indicated that the pH, irradiation time, and GEM initial concentration were the most significant factors. At the optimum set of experimental conditions, the reaction followed first-order reaction kinetics with a mean percentage degradation of ~ 95% in less than 30 min of irradiation time and almost complete loss of antibacterial activity against Escherichia coli. The promising results demonstrated the efficiency of UV/TiO2NP/H2O2 as a photocatalyst for the breakdown of the pharmacophore of fluoroquinolones from water samples. The high selectivity, minimal solvent consumption, and lack of harmful waste generation confirmed the superiority of in-line monitoring using ISE. Optimization and in-line monitoring protocol should be applicable also at the pharmaceutical industry scale to eliminate the risk of antibiotic resistance.
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Affiliation(s)
- Fawzia A Ibrahim
- Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Medhat A Al-Ghobashy
- Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt.
- Bioanalysis Research Group, School of Pharmacy, New Giza University, Giza, Egypt.
| | | | - Ibrahim F Abo-Elmagd
- Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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676
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Wang L, Kong Y, Wei D, Yang S, Chen Q, Kong Y, Li P, Ting YP, Ong CN. Toward the Quantitative Evaluation of an Activated Carbon Particle Electrode Performance in a Packed-Bed System. ChemElectroChem 2017. [DOI: 10.1002/celc.201700513] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lizhang Wang
- Department of Environmental Engineering, China University of Mining and Technology, School of Environment Science and Spatial Informatics; University of Mining and Technology; Xuzhou City, Jiangsu 221116 PR China
- NUS Environmental Research Institute, National University of Singapore, NUS Environmental Research Institute; National University of Singapore; 5A Engineering Drive 1 117411 Singapore
| | - Yan Kong
- Department of Environmental Engineering, China University of Mining and Technology, School of Environment Science and Spatial Informatics; University of Mining and Technology; Xuzhou City, Jiangsu 221116 PR China
| | - Dongyang Wei
- South China Institute of Environmental Sciences; Ministry of Environmental Protection (MEP) of PR China; Guangzhou City, Guangdong 510655 PR China
| | - Shengxiang Yang
- Department of Environmental Engineering, China University of Mining and Technology, School of Environment Science and Spatial Informatics; University of Mining and Technology; Xuzhou City, Jiangsu 221116 PR China
| | - Qing Chen
- Department of Environmental Engineering, China University of Mining and Technology, School of Environment Science and Spatial Informatics; University of Mining and Technology; Xuzhou City, Jiangsu 221116 PR China
| | - Ying Kong
- Department of Environmental Engineering, China University of Mining and Technology, School of Environment Science and Spatial Informatics; University of Mining and Technology; Xuzhou City, Jiangsu 221116 PR China
| | - Peng Li
- School of Water Resource & Environmental Engineering; East China Institute of Technology; Nanchang 330013 PR China
| | - Yen-Peng Ting
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 117585 Singapore
| | - Choon Nam Ong
- NUS Environmental Research Institute, National University of Singapore, NUS Environmental Research Institute; National University of Singapore; 5A Engineering Drive 1 117411 Singapore
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677
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Comparative electrochemical degradation of the herbicide tebuthiuron using a flow cell with a boron-doped diamond anode and identifying degradation intermediates. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.07.054] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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678
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Huang Y, Zhou T, Wu X, Mao J. Efficient sonoelectrochemical decomposition of sulfamethoxazole adopting common Pt/graphite electrodes: The mechanism and favorable pathways. ULTRASONICS SONOCHEMISTRY 2017; 38:735-743. [PMID: 27599943 DOI: 10.1016/j.ultsonch.2016.08.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 08/06/2016] [Accepted: 08/06/2016] [Indexed: 06/06/2023]
Abstract
In this study, efficient degradation of sulfamethoxazole (SMX) with a high synergy factor of 14.7 was demonstrated in a sonoelectrochemical (US-EC) system adopting common Pt and graphite electrodes. It was found that the US-EC system could work effectively at broad pH range of 3-9, but would achieve good performances with appropriate electrochemical conditions at 20mA/cm2 and 0.1M Na2SO4. Both OH attacking and the anode oxidation would be responsible for the SMX degradation in the US-EC system, while the multiple promotional roles of US would be played homogenously and heterogeneously. US could not only effectively accelerate the decomposition of cathode-generated H2O2 into OH, but also lead to the enhancement in the heterogeneous reactions on the two electrodes, i.e. the cathode generation of H2O2 as well as the anode oxidation of SMX and H2O/OH-. Besides, the US-EC system would decompose SMX molecule via similar and simple pathways, by using either Na2SO4 or NaCl electrolytes. It was interesting to note that the US-EC system could successfully avoid the formation of complex chlorinated byproducts that detected in the referring EC system with NaCl. This finding would make the sonoelectrochemical processes favorable in treating practical wastewaters by alleviating the environmental impact of disinfection byproducts.
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Affiliation(s)
- Yawei Huang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Tao Zhou
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
| | - Xiaohui Wu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, PR China
| | - Juan Mao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; Key Laboratory of Water and Wastewater Treatment (HUST), MOHURD, Wuhan 430074, PR China
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679
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Pérez J, Llanos J, Sáez C, López C, Cañizares P, Rodrigo M. A microfluidic flow-through electrochemical reactor for wastewater treatment: A proof-of-concept. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.07.026] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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680
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Zhang Z, Xian J, Zhang C, Fu D. Degradation of creatinine using boron-doped diamond electrode: Statistical modeling and degradation mechanism. CHEMOSPHERE 2017; 182:441-449. [PMID: 28521158 DOI: 10.1016/j.chemosphere.2017.05.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 05/08/2017] [Accepted: 05/10/2017] [Indexed: 06/07/2023]
Abstract
This study investigated the degradation performance and mechanism of creatinine (a urine metabolite) with boron-doped diamond (BDD) anodes. Experiments were performed using a synthetic creatinine solution containing two supporting electrolytes (NaCl and Na2SO4). A three-level central composite design was adopted to optimize the degradation process, a mathematical model was thus constructed and used to explore the optimum operating conditions. A maximum mineralization percentage of 80% following with full creatinine removal had been achieved within 120 min of electrolysis, confirming the strong oxidation capability of BDD anodes. Moreover, the results obtained suggested that supporting electrolyte concentration should be listed as one of the most important parameters in BDD technology. Lastly, based on the results from quantum chemistry calculations and LC/MS analyses, two different reaction pathways which governed the electrocatalytic oxidation of creatinine irrespective of the supporting electrolytes were identified.
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Affiliation(s)
- Zhefeng Zhang
- Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jiahui Xian
- Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Chunyong Zhang
- Department of Chemistry, College of Science, Nanjing Agricultural University, Nanjing, 210095, China; State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, China.
| | - Degang Fu
- State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, China
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681
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Raschitor A, Llanos J, Cañizares P, Rodrigo MA. Novel integrated electrodialysis/electro-oxidation process for the efficient degradation of 2,4-dichlorophenoxyacetic acid. CHEMOSPHERE 2017; 182:85-89. [PMID: 28494364 DOI: 10.1016/j.chemosphere.2017.04.153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 04/24/2017] [Accepted: 04/25/2017] [Indexed: 06/07/2023]
Abstract
This work presents a novel approach of wastewater treatment technology that consists of a combined electrodialysis/electro-oxidation process, specially designed to allow increasing the efficiency in the oxidation of ionic organic pollutants contained in diluted waste. Respect to conventional electrolysis, the pollutant is simultaneously concentrated and oxidized, enhancing the performance of the cell due to the higher concentration achieved in the nearness of the anode. A proof of concept is tested with the ionic pesticide 2,4-D (2,4-dichlorophenoxyacetic acid) and results show that the efficiency of this new technology overcomes that electrolysis by more than double, regardless the supporting electrolyte used (either NaCl or Na2SO4). Moreover, the removal rate of 2,4-D when using NaCl was found to be more efficient, due to the best performance of the electrode material selected (DSA®) towards the formation of oxidants in chloride supporting electrolyte. These results open the way for overcoming the efficiency limitations of electrochemical treatment processes for the treatment of solutions with low concentrated ionic pollutants.
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Affiliation(s)
- A Raschitor
- Chemical Engineering Department, Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Av. Camilo José Cela nº 12, 13071 Ciudad Real, Spain
| | - J Llanos
- Chemical Engineering Department, Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Av. Camilo José Cela nº 12, 13071 Ciudad Real, Spain.
| | - P Cañizares
- Chemical Engineering Department, Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Av. Camilo José Cela nº 12, 13071 Ciudad Real, Spain
| | - M A Rodrigo
- Chemical Engineering Department, Facultad de Ciencias y Tecnologías Químicas, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Av. Camilo José Cela nº 12, 13071 Ciudad Real, Spain
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682
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Cotillas S, Cañizares L, Muñoz M, Sáez C, Cañizares P, Rodrigo MA. Is it really important the addition of salts for the electrolysis of soil washing effluents? Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.06.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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683
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Study of Hydrodynamics at AsahiTM prototype electrochemical flow reactor, using computational fluid dynamics and experimental characterization techniques. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.134] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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684
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Application of Doehlert design to the electro-Fenton treatment of Bismarck Brown Y. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.05.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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685
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Synthesis of polymer nanogels by electro-Fenton process: investigation of the effect of main operation parameters. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.06.097] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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686
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Luo H, Li C, Sun X, Chen S, Ding B, Yang L. Ultraviolet assists persulfate mediated anodic oxidation of organic pollutant. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.06.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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687
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Hiwarkar AD, Singh S, Srivastava VC, Mall ID. Mineralization of pyrrole, a recalcitrant heterocyclic compound, by electrochemical method: Multi-response optimization and degradation mechanism. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 198:144-152. [PMID: 28458108 DOI: 10.1016/j.jenvman.2017.04.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 03/25/2017] [Accepted: 04/16/2017] [Indexed: 06/07/2023]
Abstract
In this study, the electrochemical (EC) oxidation of a recalcitrant heterocyclic compound namely pyrrole has been reported using platinum coated titanium (Pt/Ti) electrodes. Response surface methodology (RSM) comprising of full factorial central composite design (CCD) with four factors and five levels has been used to examine the effects of different operating parameters such as current density (j), aqueous solution pH, conductivity (k) and treatment time (t) in an EC batch reactor. Pyrrole mineralization in aqueous solution was examined with multiple responses such as chemical oxygen demand (COD) (response, Y1) and specific energy consumption (SEC) in kWh/kg of COD removed (response, Y2). During multiple response optimization, the desirability function approach was employed to concurrently maximize Y1 and minimize Y2. At the optimum condition, 82.9% COD removal and 7.7 kWh/kg of COD removed were observed. Degradation mechanism of pyrrole in wastewater was elucidated at the optimum condition of treatment by using UV-visible spectroscopy, Fourier transformed infra-red spectroscopy (FTIR), cyclic voltammetry (CV), ion chromatography (IC), higher performance liquid chromatography (HPLC) and gas chromatography-mass spectroscopy (GC-MS). The degradation pathway of pyrrole was proposed on the basis of the various analysis.
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Affiliation(s)
- Ajay Devidas Hiwarkar
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India; Department of Chemical Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi 284128, Uttar Pradesh, India.
| | - Seema Singh
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Vimal Chandra Srivastava
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Indra Deo Mall
- Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, Uttarakhand, India.
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688
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Isarain-Chávez E, Baró MD, Rossinyol E, Morales-Ortiz U, Sort J, Brillas E, Pellicer E. Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb, Ti/Ir-Sn, Ti/Ru-Pb, Ti/Pt-Pd and Ti/RuO 2 anodes. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.101] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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689
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Pd/Fe3O4 nanocatalysts for highly effective and simultaneous removal of humic acids and Cr(VI) by electro-Fenton with H2O2 in situ electro-generated on the catalyst surface. J Catal 2017. [DOI: 10.1016/j.jcat.2017.06.004] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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690
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Influencing factors and chlorinated byproducts in electrochemical oxidation of bisphenol A with boron-doped diamond anodes. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.06.163] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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691
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Riccobono G, Pastorella G, Vicari F, D'Angelo A, Galia A, Quatrini P, Scialdone O. Abatement of AO7 in a divided microbial fuel cells by sequential cathodic and anodic treatment powered by different microorganisms. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.06.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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692
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Alachlor removal performance of Ti/Ru0.3Ti0.7O2 anodes prepared from ionic liquid solution. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3700-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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693
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Cui J, Wang X, Zhang J, Qiu X, Wang D, Zhao Y, Xi B, Alshawabkeh AN, Mao X. Disilicate-Assisted Iron Electrolysis for Sequential Fenton-Oxidation and Coagulation of Aqueous Contaminants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8077-8084. [PMID: 28609093 PMCID: PMC6287740 DOI: 10.1021/acs.est.7b01184] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Sodium disilicate (SD), an inorganic and environmentally friendly ligand, is introduced into the conventional iron electrolysis system to achieve an oxidizing Fenton process to degrade organic pollutants. Electrolytic ferrous ions, which are complexed by the disilicate ions, can chemically reduce dioxygen molecules via consecutive reduction steps, producing H2O2 for the Fenton-oxidation of organics. At the near-neutral pH (from 6 to 8), the disilicate-Fe(II) complexes possess strong reducing capabilities; therefore, a near-neutral pH rather than an acid condition is preferable for the disilicate-assisted iron electrolysis (DAIE) process. Following the DAIE process, the different complexing capacities of disilicate for ferrous/ferric ions and calcium ions can be used to break the disilicate-iron complexes. The addition of CaO or CaCl2 can precipitate ferrous/ferric ions, disilicates and possibly heavy metals in the wastewater. Compared to previously reported organic and phosphorus ligands, SD is a low-cost inorganic agent that does not lead to secondary pollution, and would not compete with the target organic pollutants for •OH; therefore, it would greatly expand the application fields of the O2 activation process. The combination of DAIE and CaO treatments is envisioned to be a versatile and affordable method for treating wastewater with complicated pollutants (e.g., mixtures of biorefractory organics and heavy metals).
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Affiliation(s)
- Jiaxin Cui
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
| | - Xu Wang
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
| | - Jing Zhang
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
| | - Xiaoyu Qiu
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
| | - Dihua Wang
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
| | - Ying Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Beidou Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Akram N. Alshawabkeh
- Civil and Environmental Engineering Department, Northeastern University, Boston, Massachusetts 02115, United States
| | - Xuhui Mao
- School of Resources and Environmental Science, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430079, China
- Corresponding Author Phone: +86-27-68775799;
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694
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Trellu C, Oturan N, Pechaud Y, van Hullebusch ED, Esposito G, Oturan MA. Anodic oxidation of surfactants and organic compounds entrapped in micelles - Selective degradation mechanisms and soil washing solution reuse. WATER RESEARCH 2017; 118:1-11. [PMID: 28411528 DOI: 10.1016/j.watres.2017.04.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Revised: 04/03/2017] [Accepted: 04/05/2017] [Indexed: 06/07/2023]
Abstract
Formation of micelles at high surfactant concentration strongly modifies organic pollutant oxidation mechanisms and kinetics during anodic oxidation (AO) using boron doped diamond (BDD) anode. Results presented and discussed in this study emphasized the following mechanisms: (i) micelles act as a protective environment and reduce the availability of target molecules towards BDD(•OH); (ii) the use of low current density strongly reduces micelle degradation kinetics due to both steric hindrance phenomenon for oxidation of micelles at the BDD surface and decrease of mediated oxidation in the bulk; (iii) compounds solubilized in surfactant-containing solutions can be either oxidized after degradation of the protective environment formed by micelles or if they are present as free extra-micellar compounds. Therefore, selective degradation of organic compounds entrapped in micelles can be achieved by using low current density and high surfactant concentration. In fact, these operating conditions strongly hinder micelle oxidation, while free (extra-micellar) compounds can still be oxidized. Then, the remaining entrapped compounds can also be continuously released in the aqueous phase, according to the micellar/aqueous phase partitioning coefficient (Km). These results have been applied for the treatment of a real polycyclic aromatic hydrocarbon-containing soil washing (SW) solution. After 23 h of treatment at 2.1 mA cm-2, 83% of phenanthrene, 90% of anthracene, 77% of pyrene and 75% of fluoranthene were degraded and the treated SW solution was reused for an additional SW step with only 5% lower extraction capacity than a fresh TW80 solution. A comparative study highlighted the superiority of this treatment strategy, compared to the use of activated carbon for selective adsorption of polycyclic aromatic hydrocarbons and SW solution reuse.
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Affiliation(s)
- Clément Trellu
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France
| | - Nihal Oturan
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France
| | - Yoan Pechaud
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France
| | - Eric D van Hullebusch
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France
| | - Giovanni Esposito
- University of Cassino and Southern Lazio, Department of Civil and Mechanical Engineering, Via Di Biasio, 43, 03043, Cassino, FR, Italy
| | - Mehmet A Oturan
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, 77454, Marne-la-Vallée, France.
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695
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Electrochemical treatment of aqueous solutions of catechol by various electrochemical advanced oxidation processes: Effect of the process and of operating parameters. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.04.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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696
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Ouiriemmi I, Karrab A, Oturan N, Pazos M, Rozales E, Gadri A, Sanromán MÁ, Ammar S, Oturan MA. Heterogeneous electro-Fenton using natural pyrite as solid catalyst for oxidative degradation of vanillic acid. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.05.028] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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697
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Ganiyu SO, Oturan N, Raffy S, Esposito G, van Hullebusch ED, Cretin M, Oturan MA. Use of Sub-stoichiometric Titanium Oxide as a Ceramic Electrode in Anodic Oxidation and Electro-Fenton Degradation of the Beta-blocker Propranolol: Degradation Kinetics and Mineralization Pathway. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.047] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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698
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Yu D, Wang H, Yang J, Niu Z, Lu H, Yang Y, Cheng L, Guo L. Dye Wastewater Cleanup by Graphene Composite Paper for Tailorable Supercapacitors. ACS APPLIED MATERIALS & INTERFACES 2017; 9:21298-21306. [PMID: 28594545 DOI: 10.1021/acsami.7b05318] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Currently, the energy crisis and environmental pollution are two critical challenges confronted by humans. The development of smart strategies to address the above-mentioned issues simultaneously is significant. As the main accomplices for water pollution, several kinds of organic dyes with intrinsic redox functional groups such as phenothiazines derivatives, anthraquinone, and indigoid dyes are potential candidates for the replacement of the conventional pseudocapacitive materials. In this work, three typical organic dyes can be efficiently removed by a facile adsorption procedure using reduced graphene oxide coated cellulose fiber (rGO@CF) paper. Flexible supercapacitors based on dye/rGO@CF electrodes exhibit excellent electrochemical performances that are superior to or comparable with those of conventional pseudocapacitive materials based devices, presenting a new type of promising electrode materials. Moreover, benefiting from the high flexibility and considerable mechanical strength of the graphene composite paper, the operating potential and capacitance of the devices can be easily adjusted by tailoring the hybrid electrodes into different specific shapes followed by rational integrating. The smart design of these dye/rGO@CF paper based electrodes shows that energy storage and environmental remediation can be achieved simultaneously.
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Affiliation(s)
- Dandan Yu
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Hua Wang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Jie Yang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Zhiqiang Niu
- School of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education, Nankai University , Tianjin 300071, China
| | - Huiting Lu
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Yun Yang
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Liwei Cheng
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
| | - Lin Guo
- School of Chemistry, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beihang University , Beijing 100191, China
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699
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Pérez JF, Llanos J, Sáez C, López C, Cañizares P, Rodrigo MA. Treatment of real effluents from the pharmaceutical industry: A comparison between Fenton oxidation and conductive-diamond electro-oxidation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 195:216-223. [PMID: 27530074 DOI: 10.1016/j.jenvman.2016.08.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Revised: 07/15/2016] [Accepted: 08/06/2016] [Indexed: 06/06/2023]
Abstract
Wastewater produced in pharmaceutical manufacturing plants (PMPs), especially the one coming from organic-synthesis facilities, is characterized by its large variability due to the wide range of solvents and chemical reagents used in the different stages of the production of medicines. Normally, the toxicity of the organic compounds prevent the utilization of biological processes and more powerful treatments are needed becoming advanced oxidation processes (AOPs) a valid alternative. In this work, the efficiency in abatement of pollution by Fenton oxidation (FO) and conductive-diamond electro-oxidation (CDEO) are compared in the treatment of 60 real effluents coming from different processes carried out in a pharmaceutical facility, using standardized tests. In 80% of the samples, CDEO was found to be more efficient than FO and in the remaining 20%, coagulation was found to exhibit a great significance in the COD abatement mechanism during FO, pointing out the effectiveness of the oxidation promoted by the electrochemical technology. Mean oxidation state of carbon was found to be a relevant parameter to understand the behavior of the oxidation technologies. It varied inversely proportional to efficiency in FO and it showed practically no influence in the case of CDEO.
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Affiliation(s)
- J F Pérez
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain
| | - J Llanos
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain
| | - C Sáez
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain.
| | - C López
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain
| | - P Cañizares
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain
| | - M A Rodrigo
- Chemical Engineering Department, University of Castilla-La Mancha, Edificio Enrique Costa Novella, Campus Universitario s/n, 13005 Ciudad Real, Spain
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700
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Pérez T, López RL, Nava JL, Lázaro I, Velasco G, Cruz R, Rodríguez I. Electrochemical oxidation of cyanide on 3D Ti-RuO 2 anode using a filter-press electrolyzer. CHEMOSPHERE 2017; 177:1-6. [PMID: 28279900 DOI: 10.1016/j.chemosphere.2017.02.136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 02/08/2017] [Accepted: 02/26/2017] [Indexed: 06/06/2023]
Abstract
The novelty of this communication lies in the use of a Ti-RuO2 anode which has not been tested for the oxidation of free cyanide in alkaline media at concentrations similar to those found in wastewater from the Merrill Crowe process (100 mg L-1 KCN and pH 11), which is typically used for the recovery of gold and silver. The anode was prepared by the Pechini method and characterized by SEM. Linear sweep voltammetries on a Ti-RuO2 rotating disk electrode (RDE) confirmed that cyanide is oxidized at 0.45 < E < 1.0 V vs SHE, while significant oxygen evolution reaction (OER) occurred. Bulk oxidation of free cyanide was investigated on Ti-RuO2 meshes fitted into a filter-press electrolyzer. Bulk electrolyzes were performed at constant potentials of 0.85 V and 0.95 V and at different mean linear flow rates ranging between 1.2 and 4.9 cm s-1. The bulk anodic oxidation of cyanide at 0.85 V and 3.7 cm s-1 achieved a degradation of 94%, with current efficiencies of 38% and an energy consumption of 24.6 kWh m-3. Moreover, the degradation sequence of cyanide was also examined by HPLC.
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Affiliation(s)
- Tzayam Pérez
- Universidad de Guanajuato, Departamento de Ingeniería Geomática e Hidráulica, Av. Juárez 77, Zona Centro, 36000, Guanajuato, Guanajuato, Mexico.
| | - Rosa L López
- Universidad de Guanajuato, Departamento de Ingeniería Geomática e Hidráulica, Av. Juárez 77, Zona Centro, 36000, Guanajuato, Guanajuato, Mexico
| | - José L Nava
- Universidad de Guanajuato, Departamento de Ingeniería Geomática e Hidráulica, Av. Juárez 77, Zona Centro, 36000, Guanajuato, Guanajuato, Mexico.
| | - Isabel Lázaro
- Universidad Autónoma de San Luis Potosí, Instituto de Metalurgia-Facultad de Ingeniería, Av. Sierra Leona 550, 78210, San Luis Potosí, San Luis Potosí, Mexico.
| | - Guillermo Velasco
- Minera San Xavier S.A. de C.V., 78440, Cerro de San Pedro, San Luis Potosí, Mexico.
| | - Roel Cruz
- Universidad Autónoma de San Luis Potosí, Instituto de Metalurgia-Facultad de Ingeniería, Av. Sierra Leona 550, 78210, San Luis Potosí, San Luis Potosí, Mexico.
| | - Israel Rodríguez
- Universidad Autónoma de San Luis Potosí, Instituto de Metalurgia-Facultad de Ingeniería, Av. Sierra Leona 550, 78210, San Luis Potosí, San Luis Potosí, Mexico.
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