1
|
Cao D, Li ZL, Shi K, Liang B, Zhu Z, Liu W, Nan J, Sun K, Wang AJ. Cathode potential regulates the microbiome assembly and function in electrostimulated bio- dechlorination system. JOURNAL OF HAZARDOUS MATERIALS 2023; 443:130113. [PMID: 36252407 DOI: 10.1016/j.jhazmat.2022.130113] [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: 07/11/2022] [Revised: 09/05/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
Mechanism of microbiome assembly and function driven by cathode potential in electro-stimulated microbial reductive dechlorination system remain poorly understood. Here, core microbiome structure, interaction, function and assembly regulating by cathode potential were investigated in a 2,4,6-trichlorophenol bio-dechlorination system. The highest dechlorination rate (24.30 μM/d) was observed under - 0.36 V with phenol as a major end metabolite, while, lower (-0.56 V) or higher (0.04 V or -0.16 V) potentials resulted in 1.3-3.8 times decreased of dechlorination kinetic constant. The lower the cathode potential, the higher the generated CH4, revealing cathode participated in hydrogenotrophic methanogenesis. Taxonomic and functional structure of core microbiome significantly shifted within groups of - 0.36 V and - 0.56 V, with dechlorinators (Desulfitobacterium, Dehalobacter), fermenters (norank_f_Propionibacteriaceae, Dysgonomonas) and methanogen (Methanosarcina) highly enriched, and the more positive interactions between functional genera were found. The lowest number of nodes and links and the highest positive correlations were observed among constructed sub-networks classified by function, revealing simplified and strengthened cooperation of functional genera driven by group of - 0.36 V. Cathode potential plays one important driver controlling core microbiome assembly, and the low potentials drove the assembly of major dechlorinating, methanogenic and electro-active genera to be more deterministic, while, the major fermenting genera were mostly governed by stochastic processes.
Collapse
Affiliation(s)
- Di Cao
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Zhi-Ling Li
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Ke Shi
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Bin Liang
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Zhongli Zhu
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Wenzong Liu
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Jun Nan
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Kai Sun
- Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education, School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
| | - Ai-Jie Wang
- State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| |
Collapse
|
2
|
Fu C, Pan C, Chen T, Peng D, Liu Y, Wu F, Xu J, You Z, Li J, Luo L. Adsorption-enforced Fenton-like process using activated carbon-supported iron oxychloride catalyst for wet scrubbing of airborne dichloroethane. CHEMOSPHERE 2022; 307:136193. [PMID: 36037963 DOI: 10.1016/j.chemosphere.2022.136193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 08/18/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
Wet scrubbing is a low-cost process for disposing of air pollutants. Nevertheless, this method is rarely used for the treatment of volatile organic compounds (VOCs) because of their poor water solubility. In this study, we used a unique wet scrubbing system containing H2O2 and activated carbon (AC)-supported iron oxychloride (FeOCl) nanoparticles to remove airborne dichloroethane (DCE). The operating conditions of the wet scrubber were optimized, and the mechanism was explored. The results showed that the adsorption of dissolved DCE onto AC promoted its transfer from air to water, while the accumulation of DCE on AC facilitated its oxidation by •OH generated on FeOCl catalyst. The wet scrubber performed well at pH 3 and low H2O2 concentrations. By pulsed or continuous dosing H2O2, the cooperative adsorption-catalytic oxidation allowed long-term DCE removal from air. Benefiting from satisfactory cost-effectiveness, avoidance of toxic byproduct formation, and less corrosion and catalyst poisoning, wet scrubbers coupled with cooperative adsorption and heterogeneous advanced oxidation processes could have broad application potentials in VOC control.
Collapse
Affiliation(s)
- Chenchong Fu
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Cong Pan
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Tao Chen
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Deqin Peng
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Yaqian Liu
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Feng Wu
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Jing Xu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Zhixiong You
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China
| | - Jinjun Li
- School of Resource and Environmental Sciences, Hubei Key Lab of Bioresource and Environmental Biotechnology, Wuhan University, Wuhan 430079, China.
| | - Liting Luo
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.
| |
Collapse
|
3
|
Singh B, Gawande MB, Kute AD, Varma RS, Fornasiero P, McNeice P, Jagadeesh RV, Beller M, Zbořil R. Single-Atom (Iron-Based) Catalysts: Synthesis and Applications. Chem Rev 2021; 121:13620-13697. [PMID: 34644065 DOI: 10.1021/acs.chemrev.1c00158] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Supported single-metal atom catalysts (SACs) are constituted of isolated active metal centers, which are heterogenized on inert supports such as graphene, porous carbon, and metal oxides. Their thermal stability, electronic properties, and catalytic activities can be controlled via interactions between the single-metal atom center and neighboring heteroatoms such as nitrogen, oxygen, and sulfur. Due to the atomic dispersion of the active catalytic centers, the amount of metal required for catalysis can be decreased, thus offering new possibilities to control the selectivity of a given transformation as well as to improve catalyst turnover frequencies and turnover numbers. This review aims to comprehensively summarize the synthesis of Fe-SACs with a focus on anchoring single atoms (SA) on carbon/graphene supports. The characterization of these advanced materials using various spectroscopic techniques and their applications in diverse research areas are described. When applicable, mechanistic investigations conducted to understand the specific behavior of Fe-SACs-based catalysts are highlighted, including the use of theoretical models.
Collapse
Affiliation(s)
- Baljeet Singh
- CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro, 3810-193 Portugal
| | - Manoj B Gawande
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology Mumbai-Marathwada Campus, Jalna 431213, Maharashtra, India
| | - Arun D Kute
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology Mumbai-Marathwada Campus, Jalna 431213, Maharashtra, India
| | - Rajender S Varma
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, 779 00 Olomouc, Czech Republic
| | - Paolo Fornasiero
- Department of Chemical and Pharmaceutical Sciences, Center for Energy, Environment and Transport Giacomo Ciamiciam, INSTM Trieste Research Unit and ICCOM-CNR Trieste Research Unit, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
| | - Peter McNeice
- Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Rajenahally V Jagadeesh
- Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany.,Department of Chemistry, REVA University, Bangalore 560064, India
| | - Matthias Beller
- Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacký University, 779 00 Olomouc, Czech Republic.,CEET Nanotechnology Centre, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
| |
Collapse
|
4
|
Černíková M, Nosek J, Černík M. Combination of nZVI and DC for the in-situ remediation of chlorinated ethenes: An environmental and economic case study. CHEMOSPHERE 2020; 245:125576. [PMID: 31855757 DOI: 10.1016/j.chemosphere.2019.125576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 11/22/2019] [Accepted: 12/07/2019] [Indexed: 06/10/2023]
Abstract
Over the past two decades, the use of nanoscale zero-valent iron (nZVI) has emerged as a standard method of contaminated groundwater remediation. The effectiveness of this method depends on key intrinsic hydrogeological parameters, which can affect both reactivity of the nanoparticles and their migration in the aquifer. In the case of low hydraulic permeability, the migration of nanoparticles is limited, which negatively influences remediation. An application of nZVI reinforced with a DC electric field led to a significant increase in the efficiency of remediation, as demonstrated by long-term monitoring at a former industrial site in Horice (Czech Republic). For the method testing, a 12 × 9 m polygon was defined around well IS4, where the original contamination was predominantly composed of DCE (7300 μg/l), and with a total concentration of chlorinated ethenes of 8880 μg/l. During the first stage of the activities, 49 kg of nZVI was injected and monitored for two years. Subsequently, the electrodes were installed, and for three years, the synergistic action of nZVI within an applied DC field was monitored. Based on 32 monitoring campaigns performed over the six years, the combined method was compared with an application of the only nZVI in technical, environmental and economic terms. Technically, the method requires annual reinstallation of anodes as a result of their oxidative disintegration. Environmentally, the method provides significantly improved chlorinated ethane reduction, remediation of low permeable zones, and extended efficiency. Economically, the method is five times cheaper when compared to the nZVI used alone.
Collapse
Affiliation(s)
- Martina Černíková
- Faculty of Economics, Technical University of Liberec, Studentska 2, Liberec, Czech Republic
| | - Jaroslav Nosek
- Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentska 2, Liberec, Czech Republic
| | - Miroslav Černík
- Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentska 2, Liberec, Czech Republic.
| |
Collapse
|
5
|
Ayappan C, Jayaraman V, Palanivel B, Pandikumar A, Mani A. Facile preparation of novel Sb2S3 nanoparticles/rod-like α-Ag2WO4 heterojunction photocatalysts: Continuous modulation of band structure towards the efficient removal of organic contaminants. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116302] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
6
|
Dai C, Zhou Y, Peng H, Huang S, Qin P, Zhang J, Yang Y, Luo L, Zhang X. Current progress in remediation of chlorinated volatile organic compounds: A review. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.12.049] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
7
|
Yu Y, Jin H, Jin X, Yan R, Zhang L, Chen X. Current Pulsated Electrochemical Precipitation for Water Softening. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00448] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yang Yu
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Huachang Jin
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Xindi Jin
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Runxin Yan
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Li Zhang
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Xueming Chen
- Environmental Engineering Department, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| |
Collapse
|
8
|
Liu L, Sun X, Li W, An Y, Li H. Electrochemical hydrodechlorination of perchloroethylene in groundwater on a Ni-doped graphene composite cathode driven by a microbial fuel cell. RSC Adv 2018; 8:36142-36149. [PMID: 35558452 PMCID: PMC9088688 DOI: 10.1039/c8ra06951d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 10/18/2018] [Indexed: 12/07/2022] Open
Abstract
Enhancing the activity of the cathode and reducing the voltage for electrochemical hydrodechlorination of chlorohydrocarbon were always the challenges in the area of electrochemical remediation. In this study, a novel cathode material of Ni-doped graphene generated by Ni nanoparticles dispersed evenly on graphene was prepared to electrochemically dechlorinate PCE in groundwater. The reduction potential of Ni-doped graphene for PCE electrochemical hydrodechlorination was −0.24 V (vs. Ag/AgCl) determined by cyclic voltammetry. A single MFC with a voltage of 0.389–0.460 V and a current of 0.221–0.257 mA could drive electrochemical hydrodechlorination of PCE effectively with Ni-doped graphene as the cathode catalyst, and the removal rate of PCE was significantly higher than that with single Ni or graphene as the cathode catalyst. Moreover, neutral conditions were more suitable for Ni-doped graphene to electrochemically hydrodechlorinate PCE in groundwater and no byproduct was accumulated. Ni-doped graphene was prepared to electrochemically dechlorinate PCE driven by a microbial fuel cell. Dechlorination efficiency and reduction potential were significantly higher than for bare Ni or graphene.![]()
Collapse
Affiliation(s)
- Lu Liu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
| | - Xiaochen Sun
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
| | - Wenxin Li
- Key Laboratory of Groundwater Resources and Environment (Jilin University)
- Ministry of Education
- Changchun
- China
| | - Yonglei An
- Key Laboratory of Groundwater Resources and Environment (Jilin University)
- Ministry of Education
- Changchun
- China
| | - Hongdong Li
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012
- China
| |
Collapse
|
9
|
Fallahpour N, Yuan S, Rajic L, Alshawabkeh AN. Hydrodechlorination of TCE in a circulated electrolytic column at high flow rate. CHEMOSPHERE 2016; 144:59-64. [PMID: 26344148 PMCID: PMC4695317 DOI: 10.1016/j.chemosphere.2015.08.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 08/07/2015] [Accepted: 08/10/2015] [Indexed: 05/31/2023]
Abstract
Palladium-catalytic hydrodechlorination of trichloroethylene (TCE) by cathodic H2 produced from water electrolysis has been tested. For a field in-well application, the flow rate is generally high. In this study, the performance of Pd-catalytic hydrodechlorination of TCE using cathodic H2 is evaluated under high flow rate (1 L min(-1)) in a circulated column system, as expected to occur in practice. An iron anode supports reduction conditions and it is used to enhance TCE hydrodechlorination. However, the precipitation occurs and high flow rate was evaluated to minimize its adverse effects on the process (electrode coverage, clogging, etc.). Under the conditions of 1 L min(-1) flow, 500 mA current, and 5 mg L(-1) initial TCE concentration, removal efficacy using iron anodes (96%) is significantly higher than by mixed metal oxide (MMO) anodes (66%). Two types of cathodes (MMO and copper foam) in the presence of Pd/Al2O3 catalyst under various currents (250, 125, and 62 mA) were used to evaluate the effect of cathode materials on TCE removal efficacy. The similar removal efficiencies were achieved for both cathodes, but more precipitation generated with copper foam cathode (based on the experiments done by authors). In addition to the well-known parameters such as current density, electrode materials, and initial TCE concentration, the high velocities of groundwater flow can have important implications, practically in relation to the flush out of precipitates. For potential field application, a cost-effective and sustainable in situ electrochemical process using a solar panel as power supply is being evaluated.
Collapse
Affiliation(s)
- Noushin Fallahpour
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
| | - Songhu Yuan
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA; State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, PR China
| | - Ljiljana Rajic
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
| | - Akram N Alshawabkeh
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA.
| |
Collapse
|
10
|
Rajic L, Fallahpour N, Alshawabkeh AN. Impact of electrode sequence on electrochemical removal of trichloroethylene from aqueous solution. APPLIED CATALYSIS. B, ENVIRONMENTAL 2015; 174-175:427-434. [PMID: 25931774 PMCID: PMC4410430 DOI: 10.1016/j.apcatb.2015.03.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The electrode sequence in a mixed flow-through electrochemical cell is evaluated to improve the hydrodechlorination (HDC) of trichloroethylene (TCE) in aqueous solutions. In a mixed (undivided) electrochemical cell, oxygen generated at the anode competes with the transformation of target contaminants at the cathode. In this study, we evaluate the effect of placing the anode downstream from the cathode and using multiple electrodes to promote TCE reduction. Experiments with a cathode followed by an anode (C→A) and an anode followed by a cathode (A→C) were conducted using mixed metal oxide (MMO) and iron as electrode materials. The TCE removal rates when the anode is placed downstream of the cathode (C→A) were 54% by MMO→MMO, 64% by MMO→Fe and 87% by Fe→MMO sequence. Removal rates when the anode is placed upstream of the cathode (A→C) were 38% by MMO→MMO, 58% by Fe→MMO and 69% by MMO→Fe sequence. Placing the anode downstream of the cathode positively improves (by 26%) the degradation of aqueous TCE in a mixed flow-through cell as it minimizes the influence of oxygen generated at the MMO anode on TCE reduction at the cathode. Furthermore, placing the MMO anode downstream of the cathode neutralizes pH and redox potential of the treated solution. Higher flow velocity under the C→A setup increases TCE mass flux reduction rate. Using multiple cathodes and an iron foam cathode up stream of the anode increase the removal rate by 1.6 and 2.4 times, respectively. More than 99% of TCE was removed in the presence of Pd catalyst on carbon and as an iron foam coating. Enhanced reaction rates found in this study imply that a mixed flow-through electrochemical cell with multiple cathodes up stream of an anode is an effective method to promote the reduction of TCE in groundwater.
Collapse
Affiliation(s)
- Ljiljana Rajic
- Department of Civil and Environmental Engineering, Northeastern University, 400 Snell Engineering, 360 Huntington Avenue, Boston, MA 02115, United States
| | - Noushin Fallahpour
- Department of Civil and Environmental Engineering, Northeastern University, 400 Snell Engineering, 360 Huntington Avenue, Boston, MA 02115, United States
| | - Akram N. Alshawabkeh
- Department of Civil and Environmental Engineering, Northeastern University, 400 Snell Engineering, 360 Huntington Avenue, Boston, MA 02115, United States
| |
Collapse
|
11
|
Electrochemical processes in macro and microfluidic cells for the abatement of chloroacetic acid from water. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.03.127] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Scialdone O, Galia A, Sabatino S, Vaiana GM, Agro D, Busacca A, Amatore C. Electrochemical Conversion of Dichloroacetic Acid to Chloroacetic Acid in Conventional Cell and in Two Microfluidic Reactors. ChemElectroChem 2013. [DOI: 10.1002/celc.201300216] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
13
|
Veloso AJ, Fulthorpe RR, Kerman K. Electrochemical detection of perchloroethylene using differential pulse voltammetry. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2013.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
|
14
|
Mao X, Ciblak A, Baek K, Amiri M, Loch-Caruso R, Alshawabkeh AN. Optimization of electrochemical dechlorination of trichloroethylene in reducing electrolytes. WATER RESEARCH 2012; 46:1847-57. [PMID: 22264798 PMCID: PMC3288245 DOI: 10.1016/j.watres.2012.01.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 12/18/2011] [Accepted: 01/02/2012] [Indexed: 05/25/2023]
Abstract
Electrochemical dechlorination of trichloroethylene (TCE) in aqueous solution is investigated in a closed, liquid-recirculation system. The anodic reaction of cast iron generates ferrous species, creating a chemically reducing electrolyte (negative ORP value). The reduction of TCE on the cathode surface is enhanced under this reducing electrolyte because of the absence of electron competition. In the presence of the iron anode, the performances of different cathodes are compared in a recirculated electrolysis system. The copper foam shows superior capability for dechlorination of aqueous TCE. Electrolysis by cast iron anode and copper foam cathode is further optimized though a multivariable experimental design and analysis. The conductivity of the electrolyte is identified as an important factor for both final elimination efficiency (FEE) of TCE and specific energy consumption. The copper foam electrode exhibits high TCE elimination efficiency in a wide range of initial TCE concentration. Under coulostatic conditions, the optimal conditions to achieve the highest FEE are 9.525 mm thick copper foam electrode, 40 mA current and 0.042 mol L(-1) Na(2)SO(4). This novel electrolysis system is proposed to remediate groundwater contaminated by chlorinated organic solvents, or as an improved iron electrocoagulation process capable of treating the wastewater co-contaminated with chlorinated compounds.
Collapse
Affiliation(s)
- Xuhui Mao
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115
| | - Ali Ciblak
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115
| | - Kitae Baek
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115
- Environmental Engineering Department, Kumoh National Institute of Technology, Republic of Korea
| | - Mohammad Amiri
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115
| | - Rita Loch-Caruso
- Environmental Health Sciences Department, School of Public Health, University of Michigan, Ann Arbor, MI 48109-2029
| | - Akram N. Alshawabkeh
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115
| |
Collapse
|
15
|
Esclapez MD, Díez-García MI, Sáez V, Tudela I, Pérez JM, González-García J, Bonete P. Spectroelectrochemical study of trichloroacetic acid reduction at copper electrodes in an aqueous sodium sulfate medium. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.05.133] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
16
|
Mao X, Ciblak A, Amiri M, Alshawabkeh AN. Redox control for electrochemical dechlorination of trichloroethylene in bicarbonate aqueous media. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:6517-23. [PMID: 21671641 PMCID: PMC3150566 DOI: 10.1021/es200943z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The role of iron anode on electrochemical dechlorination of aqueous trichloroethylene (TCE) is evaluated using batch mixed-electrolyte experiments. A significantly higher dechlorination rate, up to 99%, is reported when iron anode and copper foam cathodes are used. In contrast to the oxygen-releasing inert anode, the cast iron anode generates ferrous species, which regulate the electrolyte to a reducing condition (low ORP value) and favor the reduction of TCE. The main products of TCE electrochemical reduction on copper foam cathode include ethene and ethane. The ratio of these two hydrocarbons gases varied with the electrolyte ORP condition and current density as more ethane gas generates at more reducing electrolyte condition and at higher current condition. A pseudofirst-order model is used to describe the degradation of TCE; the first-order rate constant (k) increases with the current applied but exhibits a negative relation with initial concentration. Depending on the current, electrolysis by iron anode causes a reduction in the ORP and an increase in the pH of the mixed electrolyte. Enhanced reaction rates in this investigation indicate that the electrochemical reduction using copper foam and iron anode may be a promising process for remediation of groundwater contaminated with chlorinated organic compounds.
Collapse
Affiliation(s)
| | | | | | - Akram N. Alshawabkeh
- Civil and Environmental Engineering Department, Northeastern University, 400 Snell Engineering, 360 Huntington Avenue, Boston, MA 02115 (corresponding author), Tel: 617-373-3994,
| |
Collapse
|
17
|
Sáez V, Esclapez MD, Frías-Ferrer AJ, Bonete P, Tudela I, Díez-García MI, González-García J. Lead dioxide film sonoelectrodeposition in acidic media: Preparation and performance of stable practical anodes. ULTRASONICS SONOCHEMISTRY 2011; 18:873-880. [PMID: 21195010 DOI: 10.1016/j.ultsonch.2010.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Accepted: 11/26/2010] [Indexed: 05/30/2023]
Abstract
Practical lead dioxide anodes have been obtained by electrodeposition on glassy carbon and titanium substrates in the presence and in the absence of an ultrasound field. The films obtained by mechanical agitation on glassy carbon are strongly improved when the electrodeposition process is carried out with the ultrasound field, providing adherent deposits free from nodules and stress, but with pores appearing occasionally. These enhanced properties were not achieved by mechanical conditions, even when optimization of temperature, current density, additives and geometrical aspects was attempted. The best practical anodes were obtained by sonoelectrodeposition using specially treated titanium as substrate, providing comparable behavior to commercial electrodes.
Collapse
Affiliation(s)
- V Sáez
- Grupo de Nuevos Desarrollos Tecnológicos en Electroquímica: Sonoelectroquimica y Bioelectroquimica, Dpto. de Química Física e Instituto de Electroquimíca, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
| | | | | | | | | | | | | |
Collapse
|
18
|
|
19
|
Sáez V, Esclapez MD, Tudela I, Bonete P, Louisnard O, González-García J. 20 kHz sonoelectrochemical degradation of perchloroethylene in sodium sulfate aqueous media: influence of the operational variables in batch mode. JOURNAL OF HAZARDOUS MATERIALS 2010; 183:648-654. [PMID: 20705391 DOI: 10.1016/j.jhazmat.2010.07.074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 07/15/2010] [Accepted: 07/16/2010] [Indexed: 05/29/2023]
Abstract
A preliminary study of the 20 kHz sonoelectrochemical degradation of perchloroethylene in aqueous sodium sulfate has been carried out using controlled current density degradation sonoelectrolyses in batch mode. An important improvement in the viability of the sonochemical process is achieved when the electrochemistry is implemented, but the improvement of the electrochemical treatment is lower when the 20 kHz ultrasound field is simultaneously used. A fractional conversion of 100% and degradation efficiency around 55% are obtained independently of the ultrasound power used. The current efficiency is also enhanced compared to the electrochemical treatment and a higher speciation is also detected; the main volatile compounds produced in the electrochemical and sonochemical treatment, trichloroethylene and dichloroethylene, are not only totally degraded, but also at shorter times than in the sonochemical or electrochemical treatments.
Collapse
Affiliation(s)
- Verónica Sáez
- Grupo de Nuevos Desarrollos Tecnológicos en Electroquímica: Sonoelectroquímica y Bioelectroquímica, Ap. Correos 99, 03080 Alicante, Spain
| | | | | | | | | | | |
Collapse
|