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Bolaños-Méndez D, Alvarez-Paguay J, Fernández L, Saavedra-Alulema PF, Veloz-Romero MS, Espinoza-Montero PJ. An inexpensive paracetamol sensor based on an acid-activated carbon fiber microelectrode. CHEMOSPHERE 2024; 346:140586. [PMID: 37939931 DOI: 10.1016/j.chemosphere.2023.140586] [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: 04/16/2023] [Revised: 10/20/2023] [Accepted: 10/27/2023] [Indexed: 11/10/2023]
Abstract
Paracetamol, a contaminant of emerging concern, has been detected in different bodies of water, where it can impact ecological and human health. To quantify this paracetamol, electroanalytical methods have gained support. Thus, the present study developed a simple, inexpensive, and environmentally friendly method for paracetamol quantification using a carbon fiber microelectrode based on commercial carbon fiber. To improve the carbon fiber microelectrode's paracetamol sensitivity and selectivity, it was subjected to an activation process via electrochemical oxidation in an acid medium (H2SO4 or HNO3), using 20 consecutive cycles of cyclic voltammetry. The treated (activated) carbon fiber microelectrode was characterized using scanning electron microscopy and electrochemical techniques, including chronoamperometry and electrochemical impedance spectroscopy. The H2SO4-activated carbon fiber microelectrode exhibited enhanced figures of merit, with a linear dynamic range of paracetamol detection from 0.5 to 11 μmol L-1 and a limit of detection of 0.21 μmol L-1 under optimized conditions. The method was optimized by quantifying paracetamol in commercial pharmaceutical tablets, spiked running tap water, and river water (Pita River, Quito, Ecuador, latitude -0.364955°, longitude -78.404538°); the respective recovery values were 102.89, 103.93, and 112.40%. The results demonstrated an acceptable level of accuracy and the promising applicability of this carbon fiber microelectrode as a sensor to detect paracetamol.
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Affiliation(s)
- Diego Bolaños-Méndez
- Pontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Quito, 170525, Ecuador
| | - Jocelyne Alvarez-Paguay
- Pontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Quito, 170525, Ecuador
| | - Lenys Fernández
- Pontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Quito, 170525, Ecuador.
| | | | - Moris S Veloz-Romero
- Universidad Central del Ecuador, Facultad de Ciencias Químicas, Quito, 170129, Ecuador
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2
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Fernández L, Espinoza-Montero P, Sánchez-Sarango M, Bolaños-Méndez D, Álvarez-Paguay J, Domínguez-Granda L, Rodríguez A, Romero H, Debut A, Ortiz V. Simultaneous quantification of lead, cadmium and zinc in superficial marine sediments using a carbon-fiber microelectrode modified with bismuth film. Sci Rep 2023; 13:20232. [PMID: 37981653 PMCID: PMC10658076 DOI: 10.1038/s41598-023-47526-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 11/14/2023] [Indexed: 11/21/2023] Open
Abstract
Marine sediments are a useful environmental assessment matrix as they naturally trap toxic substances of anthropogenic origin and thus have higher concentrations of these than the surrounding water. Therefore, developing methods for the sensitive, accurate, and inexpensive quantification of these substances is important, as the traditional techniques have various disadvantages. The current study evaluated the effectiveness of an in situ bismuth-modified carbon-fiber microelectrode (voltamperometric sensor) to simultaneously detect Pb, Cd, and Zn in marine sediments from Puerto Jeli in El Oro Province, Ecuador. This site is representative of the contamination levels present along the coast in this province. Differential pulse anodic stripping voltammetry was applied, and the resulting linear regression for the metal quantification ranged from 12 to 50 μg mL-1, with quantification limits for Pb(II), Cd(II), and Zn(II) of 18.69, 12.55, and 19.29 μg mL-1, respectively. Thus, the quantification with the sensor was successful. According to the preliminary results, Cd and Pb values exceeded the permissible limits established by Ecuador (Texto Unificado de la Legislación Secundaria del Ministerio del Ambiente) and the US Environmental Protection Agency, respectively.
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Affiliation(s)
- Lenys Fernández
- Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, 17-01-2184, Quito, Ecuador.
| | - Patricio Espinoza-Montero
- Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, 17-01-2184, Quito, Ecuador.
| | - Mireya Sánchez-Sarango
- Facultad de Ciencias Agropecuarias y Recursos Naturales, Universidad Técnica de Cotopaxi, Latacunga, Ecuador
| | - Diego Bolaños-Méndez
- Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, 17-01-2184, Quito, Ecuador
| | - Jocelyne Álvarez-Paguay
- Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, 17-01-2184, Quito, Ecuador
| | - Luis Domínguez-Granda
- Facultad de Ciencias Naturales y Matemáticas, Escuela Superior Politécnica del Litoral ESPOL, Campus Gustavo Galindo, Guayaquil, Ecuador
| | - Augusto Rodríguez
- Grupo CAE INIFTA (Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas), La Plata, Argentina
| | - Hugo Romero
- Facultad de Ciencias Químicas y de la Salud, Universidad Técnica de Machala, Machala, Ecuador
| | - Alexis Debut
- Centro de Nanociencia y Nanotecnología, Universidad de las Fuerzas Armadas ESPE, 170501, Sangolqui, Ecuador
| | - Vladimir Ortiz
- Facultad de Ciencias Agropecuarias y Recursos Naturales, Universidad Técnica de Cotopaxi, Latacunga, Ecuador
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3
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Vásquez-Velarde M, Fernández L, Bolaños-Méndez D, Burbano-Erazo H, Alvarez-Paguay J, Carrera P, Espinoza-Montero PJ. Evaluation of a gold-nanoparticle-modified carbon-fiber microelectrode to quantify mercury in canned tuna sold in Ecuador. CHEMOSPHERE 2023; 338:139483. [PMID: 37454989 DOI: 10.1016/j.chemosphere.2023.139483] [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: 03/31/2023] [Revised: 07/05/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
Seafood consumption is the primary exposure route for trace metals like mercury. Accordingly, canned tuna meat has been focused on by researchers because of the potential bioaccumulation of high amounts of mercury. This study aimed to test a novel and reliable electroanalytical method employing a working electrode consisting of gold-nanoparticle-modified carbon microfibers to quantify total mercury in canned tuna samples. Determination was achieved via differential pulse anodic stripping voltammetry. The proposed method had a limit of detection of 3.9781 ± 0.0001 μg L-1 and a limit of quantification of 33.6634 ± 0.0001 μg L-1, with a sensitivity of 0.3275 nA μg L-1. The modified electrode was evaluated in samples taken from three canned tuna brands sold in the Sangolquí parish in Rumiñahui, Ecuador. These brands, coded A, B, and C, represent 47.92%, 27.08%, and 11.98% of all canned tuna sold in the Ecuadorian market, respectively. The resulting respective total mercury concentrations were 0.5999 ± 0.0001 mg kg-1; 0.9387 ± 0.0001 mg kg-1; and 0.3442 ± 0.0001 mg kg-1 for A, B, and C. Method accuracy was determined through the recovery percentages of ≥98%, which indicated acceptable accuracy for the final optimized method. Mean mercury concentrations for all samples did not represent a carcinogenic risk for consumers. However, the values obtained for potential no-carcinogenic risk and daily consumption rate suggest that consumers of tuna canned in water, particularly brand C, may be at risk.
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Affiliation(s)
- Milena Vásquez-Velarde
- Escuela de Ciencias Químicas, Pontificia Universidad Católica Del Ecuador, Quito 17 01 21-84, Ecuador
| | - Lenys Fernández
- Escuela de Ciencias Químicas, Pontificia Universidad Católica Del Ecuador, Quito 17 01 21-84, Ecuador.
| | - Diego Bolaños-Méndez
- Escuela de Ciencias Químicas, Pontificia Universidad Católica Del Ecuador, Quito 17 01 21-84, Ecuador
| | - Harold Burbano-Erazo
- Escuela de Ciencias Químicas, Pontificia Universidad Católica Del Ecuador, Quito 17 01 21-84, Ecuador
| | - Jocelyne Alvarez-Paguay
- Escuela de Ciencias Químicas, Pontificia Universidad Católica Del Ecuador, Quito 17 01 21-84, Ecuador
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4
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Han J, Stine JM, Chapin AA, Ghodssi R. A portable electrochemical sensing platform for serotonin detection based on surface-modified carbon fiber microelectrodes. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:1096-1104. [PMID: 36723293 DOI: 10.1039/d2ay01627c] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Serotonin (5-HT) is one of the key neurotransmitters in the human body, regulating numerous physiological functions. A disruption in 5-HT homeostasis could result in serious health problems, including neurodegenerative disorders, depression, and 5-HT syndrome. Detection of 5-HT concentrations in biological fluids, such as urine, is a potential solution for early diagnosis of these diseases. In this study, we developed a novel, simple, and low-cost electrochemical sensing platform consisting of a portable workstation with customized electrodes for 5-HT detection in artificial biological fluids. Nafion/carbon nanotubes (CNTs) and electrochemically modified carbon fiber microelectrodes (Nafion-CNT/EC CFMEs) displayed improved 5-HT sensitivity and selectivity. Together with a customized Ag/AgCl reference electrode and Pt counter electrode, the portable 5-HT sensing platform had a sensitivity of 0.074 μA μM-1 and a limit of detection (LOD) of 140 nM. This system was also assessed to measure 5-HT spiked in artificial urine samples, showing nearly full recovery rates. These satisfactory results demonstrated that the portable system exhibits outstanding performance and confirmed the feasibility of 5-HT detection, which can be used to provide point-of-care analysis in actual biological samples.
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Affiliation(s)
- Jinjing Han
- Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA,.
- Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
| | - Justin M Stine
- Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA,.
- Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
| | - Ashley A Chapin
- Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Reza Ghodssi
- Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20742, USA,.
- Institute for Systems Research, University of Maryland, College Park, MD 20742, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
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5
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Li C, Hao L, Xu M, Nuermaimaiti N, He H, Cao J, Fang F, Liu J. Revealing the microbial mechanism of Fe 0 and MnO 2 mediated microbial fuel cell-anaerobic digestion coupling system and its energy flow distribution. CHEMOSPHERE 2022; 308:136597. [PMID: 36167208 DOI: 10.1016/j.chemosphere.2022.136597] [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: 03/20/2022] [Revised: 08/31/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
Microbial fuel cell-anaerobic digestion (MFC-AD) is a new sludge treatment technology with multi-path energy recovery. In this study, Fe0 and MnO2 with gradient concentration were added to investigate its effects on the sludge reduction, electrochemical performance, extracellular polymeric substances (EPS) of sludge, microbial community, electron distribution and energy flow of the MFC-AD system. Results showed that the highest sludge reduction 59% (49%), was obtained at 10 g/L Fe0 (5 g/L MnO2) adding and its total energy recovery efficiency increased by 100% (71%) compare to the control. Different Fe0 and MnO2 concentrations lead to different microbial mechanisms: at 10 g/L Fe0 or 5 g/L MnO2, it prefers to promote extracellular electrons transfer, favoring the Geobacter, Shewanella and Acinetobacter enrichment, while at 5 g/L Fe0 or 0.5 g/L MnO2 it plays a more important role in substrate metabolism of anaerobic digestion, with Clostridium, Roseomonas lacus, and Methylocystis enriched. Correspondingly, the electron quantity distribution from biomass to recovered energy ends (Current, CH4 and VFAs), was influenced by Fe0 and MnO2 concentration, indicating the controllability of the energy flow.
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Affiliation(s)
- Chao Li
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Liangshan Hao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Ming Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Nuershalati Nuermaimaiti
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Hanyue He
- Jiangsu Yuzhi River Basin Management Technology Research Institute, Nanjing, 210000, China
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Fang Fang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Jingliang Liu
- School of Environmental Science, Nanjing XiaoZhuang University, Nanjing, 211171, PR China.
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6
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Dumitrescu E, Deshpande A, Wallace KN, Andreescu S. Time-Dependent Monitoring of Dopamine in the Brain of Live Embryonic Zebrafish Using Electrochemically Pretreated Carbon Fiber Microelectrodes. ACS MEASUREMENT SCIENCE AU 2022; 2:261-270. [PMID: 36785866 PMCID: PMC9838818 DOI: 10.1021/acsmeasuresciau.1c00051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Neurotransmitters are involved in functions related to signaling, stress response, and pathological disorder development, and thus, their real-time monitoring at the site of production is important for observing the changes related to these disorders. Here, we demonstrate the first time-dependent quantification of dopamine in the brains of live zebrafish embryos using electrochemically pretreated carbon fiber microelectrodes (CFMEs) utilizing differential pulse voltammetry as the measurement technique. The pretreatment of the CFMEs in 0.1 M NaOH held at a potential of +1.0 V for 600 s improves the sensitivity toward dopamine and allows for reliable measurements in low ionic strength media. We demonstrate the measurement of extracellular dopamine concentrations in the zebrafish brain during late embryogenesis. The extracellular dopamine concentration in the tectum of zebrafish varies between 200 and 400 nM. The conventional pharmacological manipulation of neurotransmitter levels in the brain demonstrates the selective detection of dopamine at the implantation site. Exposure to the dopamine transporter inhibitor nomifensine induces an increase in extracellular dopamine from 201.9 (±34.9) nM to 352.2 (±20.0) nM, while exposure to the norepinephrine transporter inhibitor desipramine does not lead to a significant modulation of the measured signal. Furthermore, we report the quantitative assessment of the catecholamine stress response of embryos to tricaine, an anesthetic frequently used in zebrafish assays. Exposure to tricaine induces a short-lived increase in brain dopamine from 198.6 (±15.7) nM to a maximum of 278.8 (±14.0) nM. Thus, in vivo electrochemistry can detect real-time changes in zebrafish neurochemical physiology resulting from drug exposure.
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Affiliation(s)
- Eduard Dumitrescu
- Department
of Chemistry and Biomolecular Science, Clarkson
University, 8 Clarkson Avenue, Potsdam, New York 13699-5810, United States
| | - Aaditya Deshpande
- Department
of Chemistry and Biomolecular Science, Clarkson
University, 8 Clarkson Avenue, Potsdam, New York 13699-5810, United States
| | - Kenneth N. Wallace
- Department
of Biology, Clarkson University, 8 Clarkson Avenue, Potsdam, New York 13699-5805, United States
| | - Silvana Andreescu
- Department
of Chemistry and Biomolecular Science, Clarkson
University, 8 Clarkson Avenue, Potsdam, New York 13699-5810, United States
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7
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Batvani N, Alimohammadi S, Kiani MA. Nonenzymatic glucose sensor design based on carbon fiber ultra-microelectrode: Controlled with a manual micro adjuster. Anal Chim Acta 2022; 1209:339845. [DOI: 10.1016/j.aca.2022.339845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 04/13/2022] [Accepted: 04/16/2022] [Indexed: 11/01/2022]
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8
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Michalkiewicz S, Skorupa A, Jakubczyk M. Carbon Materials in Electroanalysis of Preservatives: A Review. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7630. [PMID: 34947225 PMCID: PMC8709479 DOI: 10.3390/ma14247630] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/02/2021] [Accepted: 12/09/2021] [Indexed: 12/24/2022]
Abstract
Electrochemical sensors in electroanalysis are a particularly useful and relatively simple way to identify electroactive substances. Among the materials used to design sensors, there is a growing interest in different types of carbon. This is mainly due to its non-toxic properties, low cost, good electrical conductivity, wide potential range, and the possibility of using it in both aqueous and nonaqueous media. The electrodes made of carbon, and especially of carbon modified with different materials, are currently most often used in the voltammetric analysis of various compounds, including preservatives. The objective of this paper is to present the characteristics and suitability of different carbon materials for the construction of working electrodes used in the voltammetric analysis. Various carbon materials were considered and briefly discussed. Their analytical application was presented on the example of the preservatives commonly used in food, cosmetic, and pharmaceutical preparations. It was shown that for the electroanalysis of preservatives, mainly carbon electrodes modified with various modifiers are used. These modifications ensure appropriate selectivity, high sensitivity, low limits of detection and quantification, as well as a wide linearity range of voltammetric methods of their identification and determination.
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Affiliation(s)
- Slawomir Michalkiewicz
- Institute of Chemistry, Jan Kochanowski University, PL-25406 Kielce, Poland; (A.S.); (M.J.)
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9
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Li C, Luo M, Zhou S, He H, Cao J, Luo J. Comparison analysis on simultaneous decolorization of Congo red and electricity generation in microbial fuel cell (MFC) with L-threonine-/conductive polymer-modified anodes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:4262-4275. [PMID: 32935215 DOI: 10.1007/s11356-020-10130-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
L-Threonine and three kinds of conductive polymers were applied for anode modification in microbial fuel cells (MFCs) for decolorization of Congo red with simultaneous electricity generation. The description of modified anodes with FTIR, surface contact angle, and CV analysis showed that the anode surface was successfully grafted with functional groups, with improving wettability, as well as the increasing specific surface area and electrochemical activity. For L-threonine modification, the highest decolorization rate of 97% of the MFC, and meanwhile, the maximum current density of 155.8 mA/m2, was obtained at the modified concentration of 400 mg/L. For conductive polymer modifications, the poly (aniline-1,8-diaminonaphthalene) (short for PANDAN) owned the highest performance, with the current density 185 mA/m2, and the decolorization rate was 97%. Compared with L-threonine, the modifications by conductive polymers were more suitable for MFC decolorization due to their functional groups and unique conductivity. In addition, high-throughput sequencing analysis was conducted for the conductive polymers modified anodes to reveal their bioelectrochemical mechanisms.
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Affiliation(s)
- Chao Li
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Miaomiao Luo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Shihua Zhou
- Third Design and Research Institute, Shanghai Municipal Engineering Design and Research General Institute, Shanghai, 200092, China
| | - Hanyue He
- Jiangsu Yuzhi River Basin Management Technology Research Institute, Nanjing, 210098, China
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China.
- College of Environment, Hohai University, Nanjing, 210098, China.
| | - Jingyang Luo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
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10
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Casimero C, Hegarty C, McGlynn RJ, Davis J. Ultrasonic exfoliation of carbon fiber: electroanalytical perspectives. J APPL ELECTROCHEM 2020. [DOI: 10.1007/s10800-019-01379-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Abstract
Electrochemical anodisation techniques are regularly used to modify carbon fiber surfaces as a means of improving electrochemical performance. A detailed study of the effects of oxidation (+ 2 V) in alkaline media has been conducted and Raman, XPS and SEM analyses of the modification process have been tallied with the resulting electrochemical properties. The co-application of ultrasound during the oxidative process has also been investigated to determine if the cavitational and mass transport features influence both the physical and chemical nature of the resulting fibers. Marked discrepancies between anodisation with and without ultrasound is evident in the C1s spectra with variations in the relative proportions of the electrogenerated carbon-oxygen functionalities. Mechanisms that could account for the variation in surface species are considered.
Graphic abstract
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11
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Li C, Zhou K, He H, Cao J, Zhou S. Adding Zero-Valent Iron to Enhance Electricity Generation during MFC Start-Up. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E806. [PMID: 32012872 PMCID: PMC7037954 DOI: 10.3390/ijerph17030806] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 01/20/2020] [Accepted: 01/22/2020] [Indexed: 11/16/2022]
Abstract
The low power generation efficiency of microbial fuel cells (MFCs) is always a barrier to further development. An attempt to enhance the start-up and electricity generation of MFCs was investigated by adding different doses of zero-valent iron into anaerobic anode chambers in this study. The results showed that the voltage (289.6 mV) of A2 with 0.5 g of zero-valent iron added was higher than the reference reactor (197.1 mV) without dosing zero-valent iron (A4). The maximum power density of 27.3 mW/m2 was obtained in A2. CV analysis demonstrated that A2 possessed a higher oxidation-reduction potential, hence showing a stronger oxidizing property. Meanwhile, electrochemical impedance analysis (EIS) also manifested that values of RCT of carbon felts with zero-valent iron supplemented (0.01-0.03 Ω) were generally lower. What is more, SEM images further proved and illustrated that A2 had compact and dense meshes with a hierarchical structure rather than a relatively looser biofilm in the other reactors. High-throughput sequencing analysis also indicated that zero-valent iron increased the abundance of some functional microbial communities, such as Acinetobacter, Ignavibacteriales, Shewanella, etc.
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Affiliation(s)
- Chao Li
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; (C.L.); (K.Z.)
- College of Environment, Hohai University, Nanjing 210098, China
| | - Kang Zhou
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; (C.L.); (K.Z.)
- College of Environment, Hohai University, Nanjing 210098, China
| | - Hanyue He
- Jiangsu Yuzhi River Basin Management Technology Research Institute, Nanjing 210000, China;
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; (C.L.); (K.Z.)
- College of Environment, Hohai University, Nanjing 210098, China
| | - Shihua Zhou
- Third Design and Research Institute, Shanghai Municipal Engineering Design and Research General Institute, Shanghai 200092, China;
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12
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Silambarasan K, Joseph J. Electrochemical Diagnosis of Chemical Switch: Impact of Structural Changes on Charge Transport Mechanism of “Redox Anion Bound Polysilsesquioxane” Film. ChemElectroChem 2018. [DOI: 10.1002/celc.201800799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - James Joseph
- Electrodics and Electrocatalysis division; Central Electrochemical Research Institute; Karaikudi India
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13
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A nickel nanoparticle/carbon nanotube-modified carbon fiber microelectrode for sensitive insulin detection. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3816-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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