Highly sensitive detection of Cr(<scp>vi</scp>) in groundwater by bimetallic NiFe nanoparticles

Liu, Jianwen; Ding, Yu; Ji, Lingfei; Zhang, Xin; Yang, Fengchun; Wang, Jiading; Kang, Weidong

doi:10.1039/c6ay03089k

Cited by 12 publications

(5 citation statements)

References 31 publications

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“…The detailed TEM images clearly show the double-layered CS structure on the Cu NA substrate: the inner electrodeposited metallic NiFe 0.10 Cr 0.10 layer with a thickness of 50–70 nm and the outer activated hydroxide layer with a thickness of 10–30 nm (Figure c,d). A series of diffraction rings are presented in the selected area electron diffraction (SAED) pattern, which can be indexed to {111}, {200} planes of NiFe alloy and {110}, {201}, {113} planes of β-Ni(OH) 2 (Figure f). − Similar diffraction rings can be observed in the SAED pattern of CS-NiFe 0.10 , with a slight increase of the lattice space of the {110}, {113} planes of β-Ni(OH) 2 (Figure S6). This slight change in lattice space can be attributed to incorporation of Cr with a smaller atomic radius into the β-Ni(OH) 2 crystal.…”

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confidence: 59%

3D Core–Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation

Fan

Zhang

et al. 2018

ACS Energy Lett.

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Low-cost transition metal-based electrocatalysts for water oxidation and understanding their structure−activity relationship are greatly desired for clean and sustainable chemical fuel production. Herein, a core− shell (CS) NiFeCr metal/metal hydroxide catalyst was fabricated on a 3D Cu nanoarray by a simple electrodeposition−activation method. A synergistic promotion effect between electronic structure modulation and nanostructure regulation was presented on a CS-NiFeCr oxygen evolution reaction (OER) catalyst: the 3D nanoarchitecture facilitates the mass transport process, the in situ formed interface metal/metal hydroxide heterojunction accelerates the electron transfer, and the electronic structure modulation by Cr incorporation improves the reaction kinetics. Benefiting from the synergy between structural and electronic modulation, the catalyst shows excellent activity toward water oxidation under alkaline conditions: overpotential of 200 mV at 10 mA/cm 2 current density and Tafel slope of 28 mV/dec. This work opens up a new window for understanding the structure−activity relationship of OER catalysts and encourages new strategies for development of more advanced OER catalysts.

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confidence: 59%

3D Core–Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation

Fan

Zhang

et al. 2018

ACS Energy Lett.

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“…Several combinations of nanomaterials have been investigated for improving the performance of the sensors [ 27 , 56 , 57 ]. The incorporation of nanocomposites as sensing material affords various advantages including, high selectivity, high surface area and fast electron-transfer rate of the electroactive species to electrode surface [ 58 , 59 , 60 , 61 , 62 ]. Moreover, those nanocomposites provide high electrical conductivity thanks to the synergistic effect which is rarely explained in the literature.…”

Section: Electrochemical Sensors For Hexavalent Chromium Determinamentioning

confidence: 99%

“…Weidong Kang et al [ 59 ] reported a new amperometric sensor based on NiFE bimetallic nanoparticles for sensitive detection of Cr(VI) in groundwater with good recovery of 98–104%. The NiFE possessed multiple oxidation states which make the surface very active.…”

Section: Electrochemical Sensors For Hexavalent Chromium Determinamentioning

confidence: 99%

Recent Advances in Electrochemical Monitoring of Chromium

Hilali

Mohammadi

Amine

et al. 2020

Sensors

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The extensive use of chromium by several industries conducts to the discharge of an immense quantity of its various forms in the environment which affects drastically the ecological and biological lives especially in the case of hexavalent chromium. Electrochemical sensors and biosensors are useful devices for chromium determination. In the last five years, several sensors based on the modification of electrode surface by different nanomaterials (fluorine tin oxide, titanium dioxide, carbon nanomaterials, metallic nanoparticles and nanocomposite) and biosensors with different biorecognition elements (microbial fuel cell, bacteria, enzyme, DNA) were employed for chromium monitoring. Herein, recent advances related to the use of electrochemical approaches for measurement of trivalent and hexavalent chromium from 2015 to 2020 are reported. A discussion of both chromium species detections and speciation studies is provided.

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“…Although these contaminants have not been discharged into groundwater directly, they can permeate into groundwater due to their strong mobility. Many studies have shown that nitrate and chrome concentrations in groundwater are higher than the ambient levels [3,11]. Several methods have been used for the simultaneous removal of nitrate and hexavalent chromium from groundwater and soils, including biofilm reactors [12], membrane reactors [13], phytoremediation [14], three-dimensional electrocatalytic reactors [15] and bio-electrochemical systems [16].…”

Section: Introductionmentioning

confidence: 99%

Construction of a Self-Powered System for Simultaneous In Situ Remediation of Nitrate and Cr(VI) Contaminated Synthetic Groundwater and River Sediment

Han

et al. 2018

Sustainability

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A novel self-powered system was constructed to in situ remove nitrate and Cr(VI) from synthetic groundwater and achieve river sediment remediation simultaneously. The sediment organic matter in an anodic chamber was used as a carbon source to provide self-powered energy to reduce the cathode's contaminants. With the acceptance of protons and electrons, nitrate and Cr(VI) were transformed into nitrite and Cr(III), respectively. In a 72 h test with both nitrate and Cr(VI) present, nitrate was removed at a rate of 70.96 mg/m 3 ·h and Cr(VI) at a rate of 8.95 mg/m 3 ·h. When a phosphate buffer was used in the test, their removal rates were changed to 140.83 mg/m 3 ·h and 8.33 mg/m 3 ·h, respectively. The results showed that the self-powered system could achieve the simultaneous reduction of nitrate and Cr(VI), although the presence of Cr(VI) hindered nitrate reduction. This system could realize simultaneous in situ groundwater and sediment remediation, with no need for additional energy or materials. nitrate and Cr(VI) coexisting in groundwater using 3-dimensional bio-electrochemical systems (BES) has been achieved, but it still needs applied potentials [16].Aquatic sediment acts as a repository for multiple pollutants in rivers and lakes, and as a significant source of internal pollutants. Pollutants include organic matter, metal contaminants, and inorganic salts [17][18][19]. Organic substances play an important role in the deterioration of water quality because when it catabolized, the dissolved oxygen in water consumed, thus results in an anoxic or anaerobic condition of water. Conditions, such as water disturbances and temperature/pH changes can lead to contaminants being released from the sediments [20].Many strategies have been proposed for the remediation of sediments. Although ex situ remediation methods, such as dredging and dry excavation can control the release of pollutants, these methods are harmful to the water environment and are also a waste of resources [19,21]. Since there are large quantities of organic matter in the sediments [22,23], with the use of sediment as a carbon source in sediment microbial fuel cells systems (sMFC) [24,25], the organic matter can be used as a carbon source, as well as an energy source for microorganisms to reduce other contaminants. To our best knowledge, the research of simultaneous treatment of contaminated groundwater and the remediation of sediment achieved without inputting additional energy and materials, has not been reported yet.In this study, a self-powered system was constructed for the in situ removal of nitrate and Cr(VI) from synthetic groundwater, and the remediation of sediment simultaneously. Using Ti wire and proton exchanger, for the connection of river sediment rich in organic matter and the nearby nitrate and Cr(VI) contaminated groundwater for their simultaneous remediation. The system was half biotic: the aquatic sediment on the anode side contained electro-active organisms, whilst the cathode side was abiotic. The aquatic sediment was used as an e...

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Highly sensitive detection of Cr(vi) in groundwater by bimetallic NiFe nanoparticles

Abstract: Hexavalent chromium (Cr(vi)) is one of the most toxic heavy metal pollutants in groundwater, and thus the detection of Cr(vi) with high sensitivity, accuracy, and simplicity and low cost is of great importance.

Cited by 12 publications

References 31 publications

3D Core–Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation

3D Core–Shell NiFeCr Catalyst on a Cu Nanoarray for Water Oxidation: Synergy between Structural and Electronic Modulation

Recent Advances in Electrochemical Monitoring of Chromium

Construction of a Self-Powered System for Simultaneous In Situ Remediation of Nitrate and Cr(VI) Contaminated Synthetic Groundwater and River Sediment

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