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Hideshima S, Ogata Y, Takimoto D, Gogotsi Y, Sugimoto W. Vertically aligned MXene bioelectrode prepared by freeze-drying assisted electrophoretic deposition for sensitive electrochemical protein detection. Biosens Bioelectron 2024; 250:116036. [PMID: 38280295 DOI: 10.1016/j.bios.2024.116036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 12/25/2023] [Accepted: 01/12/2024] [Indexed: 01/29/2024]
Abstract
Two-dimensional (2D) carbides, MXenes, have attracted attention as electrode materials of electrochemical biosensors because of their metallic conductivity, hydrophilicity, and mechanical stability. However, when fabricating electrodes, the nanosheets tend to re-stack and generally align horizontally with respect to the current collector due to the highly anisotropic nature of MXene, resulting in low porosity and poor utilization of the MXene surface. Here we report the electrochemical biosensing of antibody-antigen reactions with a vertically aligned Ti3C2Tx MXene (VA-MXene) electrode prepared by freeze-drying assisted electrophoretic deposition. The macroporous VA-MXene electrode exhibited a better electrochemical response towards the immunoreaction between the allergenic buckwheat protein (BWp16) and the antibody compared to a non-porous, horizontally (in-plane) stacked MXene (HS-MXene) and the sensors reported in the literature. The sensor responsiveness, defined as the ratio of the obtained current density of the electrode to the antigen concentration, was much higher for the VA-MXene electrode (238 μA cm-2 (ng mL-1) -1) than for the HS-MXene electrode. The proposed technique is applicable to other exfoliated nanosheets, and will open a new avenue for porous nanosheet electrodes to improve the sensing characteristics of electrochemical biosensors.
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Affiliation(s)
- Sho Hideshima
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan; Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan; Department of Applied Chemistry, Faculty of Science and Engineering, Tokyo City University, 1-28-1 Tamazutsumi, Setagaya, Tokyo, 158-8557, Japan.
| | - Yuta Ogata
- Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan
| | - Daisuke Takimoto
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan
| | - Yury Gogotsi
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan; A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104, United States
| | - Wataru Sugimoto
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan; Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano, 386-8567, Japan.
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2
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Rhee H, Kwak R. Induced-charge membrane capacitive deionization enables high-efficient desalination with polarized porous electrodes. Water Res 2023; 244:120436. [PMID: 37556990 DOI: 10.1016/j.watres.2023.120436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 07/26/2023] [Accepted: 07/29/2023] [Indexed: 08/11/2023]
Abstract
Exposure of a conducting porous material to an electric field in electrolytes induces an electric dipole, which results in capacitive charging of cations and anions at opposite poles. In this letter, we investigate a novel desalination method using this induced-charge capacitive deionization (ICCDI). To do this, we devise a microscale ICCDI platform that can visualize in situ ion concentrations, pH shifts, and fluid flows, and study ion transport dynamics and desalination performances compared to conventional CDI with unipolar / bipolar connections. Similar ion concentration and fluid flow characteristics were observed in Ohmic, limiting, and over-limiting regimes, but variations in desalination performance trends were noted based on the number of stacks. In a single cell, ICCDI generates a higher electric field at the opposite poles of porous electrodes than simple conducted electrodes in CDIs with unipolar/bipolar connections, leading to superior salt removal and/or lower ionic current at a given applied voltage. This marks a clear contrast from CDI with bipolar connection, which lacks any advantage over CDI with unipolar connection in a single cell. These metrics of ICCDI however deteriorated as the stack number increased, likely due to short-circuiting between the dipoles. As a result, ICCDI in current form shows higher desalination efficient than conventional CDIs with low stack numbers (< 6), so we offer the scale-up module by repeating 4-stack ICCDI units. Our study enhances comprehension of ion transport dynamics and desalination performance in ICCDI, and the results could aid in the development of ICCDI for energy/cost-efficient desalination.
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Affiliation(s)
- Hahnsoll Rhee
- Department of Mechanical Convergence Engineering, Hanyang University, Republic of Korea
| | - Rhokyun Kwak
- Department of Mechanical Convergence Engineering, Hanyang University, Republic of Korea; Institute of Nano Science and Technology, Hanyang University, Seoul, Republic of Korea.
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Choi J, Min J, Kim D, Kim J, Kim J, Yoon H, Lee J, Jeong Y, Kim CY, Ko SH. Hierarchical 3D Percolation Network of Ag-Au Core-Shell Nanowire-Hydrogel Composite for Efficient Biohybride Electrodes. ACS Nano 2023; 17:17966-17978. [PMID: 37668160 DOI: 10.1021/acsnano.3c04292] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
Metal nanomaterials are highly valued for their enhanced surface area and electrochemical properties, which are crucial for energy devices and bioelectronics. However, their practical applications are often limited by challenges, such as scalability and dimensional constraints. In this study, we developed a synthesis method for highly porous Ag-Au core-shell nanowire foam (AACNF) using a one-pot process based on a simultaneous nanowelding synthesis method. The unique characteristics of AACNF as metal-based electrodes show the lowest density among metal-based electrodes while demonstrating high electrical conductivity (99.33-753.04 S/m) and mechanical stability. The AACNF's excellent mass transport properties enable multiscale hierarchical incorporation with functional materials including polymeric precursors and living cells. The enhanced mechanical stability at the nanowelded junctions allows AACNF-hydrogel composites to exhibit large stretching (∼700%) and 10,000 times higher electrical conductivity than hydrogel-nanowire composites without the junction. Large particles in the 1-10 μm scale, including fibroblast cells and exoelectrogenic microbes, are also successfully incorporated with AACNF. AACNF-based microbial fuel cells show high power density (∼330.1 W/m3) within the optimal density range. AACNF's distinctive ability to form a hierarchical structure with substances in various scales showcases its potential for advanced energy devices and biohybrid electrodes in the future.
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Affiliation(s)
- Joonhwa Choi
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - JinKi Min
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Dohyung Kim
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jin Kim
- College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Jinsol Kim
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Hyeokjun Yoon
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Jinwoo Lee
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Youngin Jeong
- College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - C-Yoon Kim
- College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Seung Hwan Ko
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
- Institute of Engineering Research, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826 Korea
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Yang P, Gao Y, Xue L, Han Y, An J, He W, Feng Y. Lignocellulose reconstituted shape-controllable self-supporting carbonaceous capacitance-anodes with high electron transfer rates for high-performance microbial electrochemical system. Bioresour Technol 2023; 380:129072. [PMID: 37088429 DOI: 10.1016/j.biortech.2023.129072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/16/2023] [Accepted: 04/18/2023] [Indexed: 05/03/2023]
Abstract
Natural biomass is a promising candidate for manufacturing an efficient anode in the microbial electrochemical system (MES) for its abundance and low cost. However, the structure and performance of the electrode highly depend on the biomass species. A simple and sustainable method for creating a self-supporting electrode is proposed by freeze-drying and carbonizing a blend of cellulose, lignin, and hemicellulose. This strategy leads to a cork-like structure and improved mechanical strength of the lignocellulose carbon. A power density of 4780 ± 260 mW m-2 (CLX-800) was achieved, which was the highest record for unmodified lignocellulose-based anodes in the microbial fuel cells. The morphological as lamellar multilayer and rich in hydrophilic functional groups could facilitate the formation of thick electroactive biofilms and enrich Geobacter with the highest abundance of 92.3%. The CLX material is expected to be the ideal electrode for high performance and functionally controllability.
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Affiliation(s)
- Pinpin Yang
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
| | - Yaqian Gao
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
| | - Lefei Xue
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
| | - Yu Han
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
| | - Jingkun An
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
| | - Weihua He
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Yujie Feng
- School of Environmental Science and Engineering, Academy of Ecology and Environment, Tianjin University, No 92 Weijin Road, Nankai District 300072 Tianjin, China
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Shi J, Gao Y, Liu D, Shen Z, Fan J, Yu Y, Bao M, Li P, Yao R. Preparing porous Cu/Pd electrode on nickel foam using hydrogen bubbles dynamic template for high-efficiency and high-stability removal of nitrate from water. Environ Sci Pollut Res Int 2022; 29:57629-57643. [PMID: 35355186 DOI: 10.1007/s11356-022-19942-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
Electrochemical reduction is a promising technology to remove nitrate from water. The metallic composition and geometry of electrodes usually dominate the nitrate removal property. Based on nickel foam (NF), we prepared Cu/Pd bimetallic electrode using hydrogen bubbles dynamic template according to a two-step electrodeposition method (Pd after Cu). The micromorphology, crystal structure, and metallic composition were analyzed by using the field emission scanning electron microscope with energy dispersive spectroscopy (FESEM-EDS), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) instruments, respectively. 4.4 mg of Cu and 1.4 mg of Pd were detected on the prepared Cu/Pd electrode. The micromorphology of prepared Cu/Pd electrode showed a grape-bunch look with porous structure of two stage sizes (100-500 nm and 200-300 μm). 98% of the initial NO3--N (100 mg/L) was removed under the potential of - 1.6 V vs. Ag/AgCl saturated KCl after 24 h of reaction when using 0.05 mol/L of Na2SO4 or NaCl as electrolyte. But the concentration of produced NH4+-N was higher than 80 mg/L when using Na2SO4 as electrolyte, which was close to 0 mg/L when using NaCl as electrolyte. The cyclic voltammetry curves of 1000 cycles and the long-term continuous flow test of about 200 h suggested that the prepared Cu/Pd electrode showed high stability for nitrate removal from water.
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Affiliation(s)
- Jialu Shi
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Ya Gao
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Daoru Liu
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China
| | - Zhanhui Shen
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China.
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210046, People's Republic of China.
| | - Jing Fan
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Yating Yu
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Meihui Bao
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Panpan Li
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
| | - Rui Yao
- Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, NO. 64 Jianshe Road, Xinxiang, 453007, People's Republic of China
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6
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Silva D, Guerra C, Muñoz H, Aguilar C, Walter M, Azocar M, Muñoz L, Gürbüz E, Ringuedé A, Cassir M, Sancy M. The effect of Staphylococcus aureus on the electrochemical behavior of porous Ti-6Al-4V alloy. Bioelectrochemistry 2020; 136:107622. [PMID: 32784103 DOI: 10.1016/j.bioelechem.2020.107622] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 07/22/2020] [Accepted: 07/23/2020] [Indexed: 11/30/2022]
Abstract
Ti-6Al-4V alloy has been widely investigated for biomedical applications due to its low density, high specific strength, and favorable corrosion resistance. However, some reported failures have imposed a challenge to improve bone regeneration and fixation, as well as antibacterial properties. A further opportunity for solving this problem is the introduction of porosity. However, this can induce metallic release and corrosion product formation. In this work, a Ti-6Al-4V alloy was exposed to Hank's solution, sterilized and inoculated with Staphylococcus aureus at 37 °C. Surface analysis was carried out by SEM-EDS and XPS. Electrochemical measurements were also performed using chronopotentiometry at open circuit potential, polarization curves, and electrochemical impedance spectroscopy. After exposure, FE-SEM showed some colonies of S. aureus on the sample with 22% porosity. However, XPS analysis revealed that the presence of bacterium influenced the composition of the oxide layer, even more drastically with the increase in added porosity. Moreover, the impedance analysis showed De Levie's behavior, revealing a reduction of pore resistance and modulus of the impedance in the low frequency range in inoculated medium, and polarization curves showed that the passivity potential range was decreased, whereas the passivity current increased in the presence of the S. aureus.
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Affiliation(s)
- Daniela Silva
- Escuela de Construcción Civil, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile
| | - Carolina Guerra
- Escuela de Construcción Civil, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile; Departamento de Ingeniería Mecánica y Metalúrgica, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Hugo Muñoz
- Escuela de Construcción Civil, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Claudio Aguilar
- Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso, Chile
| | - Mariana Walter
- Departamento de Química de Materiales, Facultad de Química y Biología, Universidad de Santiago, Av. Libertador Bernardo ÓHiggins 3363, Santiago, Chile
| | - Manuel Azocar
- Departamento de Química de Materiales, Facultad de Química y Biología, Universidad de Santiago, Av. Libertador Bernardo ÓHiggins 3363, Santiago, Chile
| | - Lisa Muñoz
- Departamento de Química de Materiales, Facultad de Química y Biología, Universidad de Santiago, Av. Libertador Bernardo ÓHiggins 3363, Santiago, Chile
| | - Ersan Gürbüz
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie de Paris, 75005 Paris, France
| | - Armelle Ringuedé
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie de Paris, 75005 Paris, France
| | - Michel Cassir
- Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie de Paris, 75005 Paris, France
| | - Mamié Sancy
- Escuela de Construcción Civil, Facultad de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile; Centro de Investigación en Nanotecnología y Materiales Avanzados "CIEN-UC", Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
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Cacho F, Masac J, Zakhar R, Beinrohr E. Indirect electrochemical determination of sulfates in mineral water by a flow-through system. Talanta 2020; 207:120281. [PMID: 31594605 DOI: 10.1016/j.talanta.2019.120281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 08/14/2019] [Accepted: 08/19/2019] [Indexed: 10/26/2022]
Abstract
The paper describes the indirect determination of sulfates by in-electrode coulometric indication method. The principle of the determination of sulfates consists in the on-line coupling of the exchange column filled with barium chromate and the flow-through coulometric analyser. In the column BaCrO4(s) converts to BaSO4(s) according to the equation: BaCrO4(s)+SO42-(aq)→BaSO4(s)+CrO42-(aq). This conversion is caused by the lower solubility of BaSO4(s) compared to the solubility of BaCrO4(s). Subsequently, the concentration of the chromate in the eluate solution was determined by the in-electrode coulometric indication method in the electrode made of reticulated vitreous carbon. The solution flowing out of the column was mixed in the flow-through analyser with 0.4 mol L-1 hydrochloric acid and the concentration of chromates was determined by direct reduction of Cr(VI) to Cr(III) with a constant current. The determination was evaluated by the calibration curve method. The linear range of the calibration curve was 3.9-100 mg L-1. The detection limit and the accuracy were 1.3 mg L-1 and 3.2%, respectively. The interference of the bicarbonate was eliminated through a conversion to insoluble carbonate by boiling the sample. The procedure was validated by analyses of certified reference material and bottled mineral water samples. A good agreement with the ion chromatography was achieved for all samples.
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Affiliation(s)
- Frantisek Cacho
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia.
| | - Jakub Masac
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Ronald Zakhar
- Institute of Chemical and Environmental Engineering, Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
| | - Ernest Beinrohr
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinskeho 9, 812 37, Bratislava, Slovakia
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Jian X, Li Y, Zhao C, Chang Y, Gao Z, Song YY. Introducing graphitic carbon nitride nanosheets as supersandwich-type assembly on porous electrode for ultrasensitive electrochemiluminescence immunosensing. Anal Chim Acta 2019; 1097:62-70. [PMID: 31910970 DOI: 10.1016/j.aca.2019.10.070] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 10/19/2019] [Accepted: 10/29/2019] [Indexed: 12/24/2022]
Abstract
Biomarkers in blood or tissue provide essential information for clinical screening and early disease diagnosis. However, increasing the sensitivity of detecting biomarkers remains a major challenge in a wide variety of electrochemical immunoassays. Herein, we present an electrochemiluminescence (ECL) immunosensing strategy with 1: Nn amplification ratio (target-to-signal probe) for biomarkers detection on a porous gold electrode. The high porosity of the electrode surface provides enough bonding sites for capturing the target biomolecules and thus many DNA labels can be introduced. On the basis of this concept, a great number of graphitic carbon nitride (g-C3N4) nanosheets are employed to create a supersandwich-type assembly on a porous electrode via the DNA hybridization process. Furthermore, compared with the traditional sandwich immunoassay (the ratio of target-to-signal probe is 1 : 1), the supersandwich construction can introduce a large number of signal probes, thus resulting in a highly improved sensitivity. The proposed ECL immunosensor exhibits an excellent performance in a concentration range from 0.01 fg mL-1 to 1 μg mL-1 with an ultralow detection limit of 0.001 fg mL-1 (S/N = 3) and excellent selectivity. This sensing strategy could be developed into a real-time assay for the disease-related molecular targets, with many practical applications in biotechnology and life science.
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Affiliation(s)
- Xiaoxia Jian
- College of Science, Northeastern University, Shenyang, 110004, China
| | - Yahang Li
- College of Science, Northeastern University, Shenyang, 110004, China
| | - Chenxi Zhao
- College of Science, Northeastern University, Shenyang, 110004, China
| | - Yaya Chang
- College of Science, Northeastern University, Shenyang, 110004, China
| | - Zhida Gao
- College of Science, Northeastern University, Shenyang, 110004, China
| | - Yan-Yan Song
- College of Science, Northeastern University, Shenyang, 110004, China.
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9
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Yi J, Liu Z, Liu J, Liu H, Xia F, Tian D, Zhou C. A label-free electrochemical aptasensor based on 3D porous CS/rGO/GCE for acetamiprid residue detection. Biosens Bioelectron 2020; 148:111827. [PMID: 31698302 DOI: 10.1016/j.bios.2019.111827] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 10/24/2019] [Accepted: 10/25/2019] [Indexed: 12/27/2022]
Abstract
A novel label-free electrochemical aptasensor was fabricated based on a three-dimensional porous electrode (3D-CS/rGO/GCE) for the detection of acetamiprid residues. The sensing signal was generated by the DNA itself. The porous electrode was prepared by electrodeposition in situ and characterized by scanning electron microscope (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). These results indicated that the porous electrode has a uniform nanoporous structure, high active area, and excellent conductivity, leading to improve the transmission efficiency of current signals. The 3D-CS/rGO/GCE was used to increase a load of acetamiprid aptamer on the electrode. Meanwhile, DNA self-assembly strategy was used to further increase the DNA amounts. Thus the electrochemical current was amplified significantly due to increased phosphate group amounts by the above synergistic effect. The determination of acetamiprid residues using square wave voltammetry (SWV) showed good sensitivity, with the linear range from 0.1 pM to 0.1 μM and the detection limit was 71.2 fM. The label-free electrochemical aptasensor was also used to detect acetamiprid residues in tea samples with satisfactory results.
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Fallahzadeh RA, Ehrampoush MH, Mahvi AH, Ghaneian MT, Dalvand A, Salmani MH, Fallahzadeh H, Nabi Meybodi M. Designing and modeling of a novel electrolysis reactor using porous cathode to produce H 2O 2 as an oxidant. MethodsX 2019; 6:1305-1312. [PMID: 31205863 PMCID: PMC6558086 DOI: 10.1016/j.mex.2019.05.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 05/30/2019] [Indexed: 12/07/2022] Open
Abstract
The entry of toxic organic pollutants and resistant to biodegradation has increased the concern about human health. The use of advanced oxidation (AO) processes to degrade these pollutants has been developing. One of the AO processes is based on the use of hydrogen peroxide in removing resistant organic pollutants. This study aimed to develop a new reactor capable of producing H2O2 in the solution. Therefore, a porous electrode made of stainless steel with the capability of air injection in the electrode center was used. The 30 cm rod graphite electrodes were also used as an anode electrode in a 4000 ml reactor. The effects of variables, including current density (30–40 mA/cm2), time (10–30 min), and electrolyte concentration (12–17 mM/L) on the amount of H2O2 production were evaluated by Box behenken design under response surface methodology using Design expert software. The results of this study showed that H2O2 can be produced at the electrode surface of porous cathode under optimal conditions of 36 mA/cm2 current density, 16 mM/l electrolyte concentration, in 23 min, and in the amount of 34 ppm. Using a porous cathode electrode causes the maximum contact among the solution, water, and air, and increases the production of H2O2. The release of resistant organic compounds to the waste water is a serious problem to the environment. By the application of the Electro-oxidation (EO)reactor with the ability to produce H2O2, this issue is resolved. Furthermore, this technique is applied for non-selective degradation of the toxic organic compounds. The electro-oxidation process is a useful method for destruction of persistent organic matter from wastewater. Due to use of porous cathode in this method, contact between the electrode and the sewage is at its maximum level which increases the efficiency and speed of sewage treatment. This method can produce H2O2 as a high potential oxidant that can reduce persistent organic properties of sewage and make the wastewater suitable for biological treatment.
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Affiliation(s)
- Reza Ali Fallahzadeh
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Hassan Ehrampoush
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Amir Hossein Mahvi
- Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.,Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Taghi Ghaneian
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Arash Dalvand
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Hossein Salmani
- Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Hossien Fallahzadeh
- Department of Biostatistics and Epidemiology, School of Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohsen Nabi Meybodi
- Department of Pharmaceutics, Faculty of Pharmacy, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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