Highly sensitive detection of hexavalent chromium utilizing a sol-gel/carbon nanotube modified electrode

Rosolina, Samuel M.; Bragg, Stefanie A.; Ouyang, Ruizhuo; Chambers, James Q.; Chen, Xue-Tai

doi:10.1016/j.jelechem.2016.08.001

Cited by 20 publications

(7 citation statements)

References 61 publications

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“…Colloidal suspensions of silole nanoparticles have also been employed as selective Cr(VI) chemosensors [13]. There is also considerable interest in the development of electrochemical sensors for the quantification of Cr(VI) [14][15][16][17][18][19][20][21][22]. This is largely due to the fact that electrochemical sensors and indeed many of the optical sensors can be employed as portable devices, eliminating the need for large instrument analysis.…”

Section: Introductionmentioning

confidence: 99%

“…While there is good electrocatalytic activity for Cr(VI) reduction at gold electrodes, more promising results have been achieved with gold nanoparticles [18][19][20]. In terms of carbon-based electrodes, there is also interest in using carbon nanotubes in the development of Cr(VI) sensors [21]. This is largely due to their impressive range of properties, which include very high surface areas, very good conductivity and it is relatively easy to modify their surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles

2018

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A nanocomposite consisting of gold nanoparticles deposited on the side walls of functionalised multi-walled carbon nanotubes, Ox-MWCNT-Au nano , was prepared using a simple chemical reduction. The nanoparticles were well dispersed with a mean diameter of 7.5 nm and had a face-centred cubic structure and a gold loading between 2.0% and 2.6% by weight. These gold decorated nanotubes were cast onto a gold electrode to form a uniform and homogeneous sensor. Using cyclic voltammetry, the reduction of Cr(VI) was observed at a peak potential of 0.52 V versus SCE in an acidified H 2 SO 4 solution, pH 2.0. A linear calibration curve with a sensitivity of 0.28 mA mM − 1 and a LOD of 7.2 × 10 − 7 M was obtained using constant potential amperometry coupled with rotating disc voltammetry. The electrochemical detection of Cr(VI) was also observed at a MWCNT-modified gold substrate but with a higher LOD, illustrating the advantage of combining the gold nanoparticles with MWCNTs. The sensor showed good selectivity for the detection of Cr(VI) in the presence of Cu(II), chloride and nitrates and in a real water sample. This was attributed to the electropositive reduction potentials of Cr(VI), the acidic H 2 SO 4 supporting electrolyte that provides a well-known cleaning effect at gold, and the size and good dispersion of the gold nanoparticles that minimise particle agglomeration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles

2018

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“…The developed sensor detects chromium ions in the linear range of 5-300 μg L À 1 and 0.8 μg L À 1 detection limit. [116] Jothimuthu et al developed a nano-platform using CNT modified with magnetic nanoparticles (Bi and Mg) and performed electroanalytical studies for the detection of Fe(II) and Fe(III) ions. The developed sensor exhibited detection from 0.01 nM to 10 mM.…”

Section: Recognition Of Metal Cationsmentioning

confidence: 99%

Carbon Nanotubes and its Potential Application in Sensing

Billing

2021

ChemistrySelect

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This study provides overview of the different type of nanomaterials depending upon their size, and type, however focusing more on the Carbon Nanotubes. This review highlights the different synthesis and purification techniques and also the functionalization methods of Carbon Nanotubes (CNTs). In particular, molecular recognition application of Carbon Nanotubes is explored in the present study. The majority of data was collected for optical and electrochemical studies of Carbon Nanotube based platform for the detection of metal ions, anions, nitroaromatics, biomolecules and gas molecules since last two decades. This review ends with an outlook of future perspectives that could be employed in nano sensor fabrication. I believe this review will act as a road map to guide the new researchers towards the concept of nanofabrication that can be employed to develop Carbon Nanotube based platform for sensing applications.

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“…The use of CNTs allows the increase of the current response, resulting in the determination of Cr(VI) at trace levels at a concentration as low as 5 µg·L −1 [ 31 ]. Similarly, the modification of glassy carbon electrode (GCE) by carboxylated single-walled carbon nanotubes and pyridinium functionalized sol-gel thin film was carried out successfully by Samuel M. Rosolina and coworkers for Cr(VI) monitoring by square wave voltammetry (SWV) [ 32 ]. The accumulation of chromate took place on the protonated pyridinium, followed by chromium reduction, resulting in its stripping from the electrode surface and subsequent detection.…”

Section: Electrochemical Sensors For Hexavalent Chromium Determinamentioning

confidence: 99%

“…The accumulation of chromate took place on the protonated pyridinium, followed by chromium reduction, resulting in its stripping from the electrode surface and subsequent detection. The addition of SWCNTs reduced the limit of detection from 4.6 µg·L −1 [ 33 ] to 0.8 µg·L −1 [ 32 ].…”

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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Highly sensitive detection of hexavalent chromium utilizing a sol-gel/carbon nanotube modified electrode

Cited by 20 publications

References 61 publications

Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles

Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles

Carbon Nanotubes and its Potential Application in Sensing

Recent Advances in Electrochemical Monitoring of Chromium

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