scispace - formally typeset
Search or ask a question
Journal ArticleDOI

A non-covalent interaction of Schiff base copper alanine complex with green synthesized reduced graphene oxide for highly selective electrochemical detection of nitrite

TL;DR: In this paper, a selective nitrite sensor based on non-covalent interaction of Schiff base copper complex [Cu(sal-ala)(phen)] with reduced graphene oxide (RGO) was developed by simple eco-friendly approach.
Abstract: A novel and selective nitrite sensor based on non-covalent interaction of Schiff base copper complex [Cu(sal-ala)(phen)] with reduced graphene oxide (RGO) was developed by simple eco-friendly approach. The morphology of the prepared RGO/[Cu(sal-ala)(phen)] nanocomposite was characterized by scanning electron microscopy (SEM), ultraviolet visible spectroscopy (UV), electrochemical impedance spectroscopy (EIS), energy dispersive X-ray spectroscopy, X-ray diffraction studies and Fourier transform infrared spectroscopy (FT-IR). On the other hand, the electrochemical studies of the prepared nanocomposite was investigated by cyclic voltammetry (CV) and amperometric technique. The RGO/[Cu(sal-ala)(phen)] nanocomposite modified glassy carbon electrode (GCE) exhibit the higher electrocatalytic activity towards detection of nitrite. Moreover, the RGO/[Cu(sal-ala)(phen)] modified GCE was determined the nitrite with low detection limit (19 nM), broad linear range (0.05–1000 μM) and high sensitivity (3.86 μA μM−1 cm−2). Besides, the proposed sensor shows good selectivity, repeatability, reproducibility and long term operational stability. The appreciable recoveries was achieved for the detection of nitrite in water and sausage samples, which imply the practical feasibility of the modified electrode.
Citations
More filters
Journal ArticleDOI
TL;DR: In this paper, the state-of-the-art of carbon nanomaterial-enabled electrochemical sensors in nitrite detection in the past years (2014-2018) is presented.
Abstract: Nitrite is widely found in the natural environment and human life, but the abuse and potential toxicity of nitrite poses a great threat to human health. Therefore, it is necessary to develop effective, robust, and reliable methods for nitrite detection. Carbon nanomaterials have shown their great potential in the development of high-performance electrochemical sensors in view of their numerous fascinating properties. Carbon nanomaterial-enabled electrochemical sensors have been regarded as one of the most promising detection tools for nitrite due to their high sensitivity, simplicity of operation, and excellent selectivity. In this review, we introduce the state-of-art of carbon nanomaterial-enabled electrochemical sensors in nitrite detection in the past years (2014–2018). The properties and advantages of carbon nanotubes, graphene, graphene oxide, carbon nanofibers, carbon nanodots, nanodiamonds, and nanoporous carbon in the development of nitrite sensors are discussed in details. Furthermore, the challenges and prospects for the application of carbon nanomaterial-enabled electrochemical sensors for nitrite analysis are also included.

145 citations

Journal ArticleDOI
TL;DR: The CeO2 NPs modified electrode has the fast response, high sensitivity and good selectivity and can be regarded as an effective way to enhance the catalytic activity towards the benzyl alcohol and nitrite.
Abstract: Cerium oxide nanoparticles (CeO2 NPs) are favorable in nanotechnology based on some remarkable properties. In this study, the crystalline CeO2 NPs are successfully prepared by an efficient microwave combustion (MCM) and conventional route sol-gel (CRSGM) methods. The structural morphology of the as-prepared CeO2 NPs was investigated by various spectroscopic and analytical techniques. Moreover, the XRD pattern confirmed the formation of CeO2 NPs as a face centered cubic structure. The magnetometer studies indicated the low saturation magnetization (23.96 emu/g) of CeO2 NPs for weak paramagnetic and high saturation magnetization (32.13 emu/g) of CeO2 NPs for super paramagnetic. After that, the oxidation effect of benzyl alcohol was investigated which reveals good conversion and selectivity. Besides, the CeO2 NPs modified glassy carbon electrode (GCE) used for the detection of nitrite with linear concentration range (0.02–1200 μM), low limit of detection (0.21 μM) and higher sensitivity (1.7238 μAμM−1 cm−2). However, the CeO2 NPs modified electrode has the fast response, high sensitivity and good selectivity. In addition, the fabricated electrode is applied for the determination of nitrite in various water samples. Eventually, the CeO2 NPs can be regarded as an effective way to enhance the catalytic activity towards the benzyl alcohol and nitrite.

102 citations

Journal ArticleDOI
TL;DR: A green route to prepare reduced graphene oxide supported cobalt inorganic complex nanocomposite (GRGO/[Co(bpy)3]) (bpy=2, 2′-bipyridine) through facile and wet chemical approach was described in this paper.
Abstract: Herein, we are described a green route to prepare reduced graphene oxide supported cobalt inorganic complex nanocomposite (GRGO/[Co(bpy)3]) (bpy=2, 2′-bipyridine) through facile and wet chemical approach The formation of the nanocomposite was confirmed through suitable physical and chemical characterization techniques The GRGO/[Co(bpy)3] nanocomposite was coated on the pretreated glassy carbon electrode (GCE) The GCE/GRGO/[Co(bpy)3] modified electrode has excellent electrocatalytic ability towards methyl parathion reduction, while the overpotential drops drastically to –018 V (vs Ag/AgCl) Moreover, the effect of concentration, scan rate and electrolyte pH were detail studied Besides, the linear response range was 005-1700 μM and the detection limit was 00029 μM (S/N=3) and the sensitivity was 18197 μA μM−1 cm−2 Moreover, the fabricated electrode has high level of selectivity, which delivers satisfactory repeatability, reproducibility and stability The sensing method was successfully demonstrated in real samples such as, tomato and apple samples

40 citations

Journal ArticleDOI
TL;DR: These aspects are briefly discussed in this short review through addressing the state of the art of electrochemical (bio)sensors in connection with the green chemistry.
Abstract: Nowadays, materials, solvents, and techniques are being used in accordance with the principles of green analytical chemistry for the development and application of electrochemical (bio)sensors. Electrodes prepared from nontoxic materials, eco-friendly solvents and reagents, and methodologies that make it possible the reduction of the sample size and the amount of waste products are being used with the main objective of minimizing the environmental impact. These aspects are briefly discussed in this short review through addressing the state of the art of electrochemical (bio)sensors in connection with the green chemistry. The relevant aspects related to the different items are considered with some illustrative examples taken from the recent literature. With the aim of providing suitable complete information, a table summarizing the fundamentals and analytical characteristics of some configurations is included in the Supporting Information .

24 citations

Journal ArticleDOI
TL;DR: In this paper, a facile and simple wet chemical approach was proposed for the fabrication of two-dimensional (2D) cerium tungstate (CeW2O9; CeW) nanosheets and evaluated as an electrochemical sensor for the detection of nitrite ions.
Abstract: In this present scenario, for the first time, we propose a facile and simple wet chemical approach for the fabrication of two-dimensional (2D) cerium tungstate (CeW2O9;CeW) nanosheets and evaluated as an electrochemical sensor for the detection of nitrite ions. The successful formation of CeW2O9 nanosheets was confirmed by various physicochemical techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, Raman, Scanning electron microscope, Transmission electron microscope and Energy dispersive X-ray studies. The electrochemical properties of the CeW nanosheets were studied by using cyclic voltammograms (CV) and chronoamperometric techniques. As an electrochemical sensor, the CeW nanosheets modified glassy carbon electrode (GCE) showed superior electrocatalytic activity in the oxidation of nitrite in terms of higher anodic peak current and lower oxidation potential when compared with unmodified GCE. CeW nanosheets based electrochemical sensor has been fabricated which detect nitrite in wide linear response range, good sensitivity and very low detection limit of 0.02–986 μM, 2.85 μA μM−1 cm−2 and 8 nM, respectively. Moreover, the CeW nanosheets modified GCE exhibited excellent selectivity even in the presence of common metal ions and biologically co-interfering compounds. For the practical viability of the prepared amperometric sensor has been utilized in various water samples such as tap, lake and drinking water and the obtained recoveries are appreciable.

24 citations

References
More filters
Journal ArticleDOI
01 Jun 2007-Carbon
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.

12,756 citations

Journal ArticleDOI
TL;DR: The transparency, conductivity, and ambipolar transfer characteristics of the films suggest their potential as another materials candidate for electronics and opto-electronic applications.
Abstract: In this work we present a low cost and scalable technique, via ambient pressure chemical vapor deposition (CVD) on polycrystalline Ni films, to fabricate large area (∼cm2) films of single- to few-layer graphene and to transfer the films to nonspecific substrates. These films consist of regions of 1 to ∼12 graphene layers. Single- or bilayer regions can be up to 20 μm in lateral size. The films are continuous over the entire area and can be patterned lithographically or by prepatterning the underlying Ni film. The transparency, conductivity, and ambipolar transfer characteristics of the films suggest their potential as another materials candidate for electronics and opto-electronic applications.

5,663 citations

Journal ArticleDOI
TL;DR: In this article, a new green route for the synthesis of processable graphene on a large scale was reported by heating an exfoliated graphite oxide (GO) suspension under strongly alkaline conditions at moderate temperatures (50-90 8C).
Abstract: Graphene – a flat monolayer of carbon atoms tightly packed into a two-dimensional (2D) honeycomb lattice – is the basal building block in all graphitic materials. Since it was first reported in 2004, graphene has attracted great interest because of the unique electronic, thermal, and mechanical properties arising from its strictly 2D structure, and to its potential technical applications. However, producing graphene on a large scale using existing mechanical methods is still unfeasible. Searching for alternative chemical approaches is an urgent matter. However, the hydrophobic nature of graphene and its strong tendency to agglomerate in solvents present a great challenge to the development of fabrication methods, and severely restrict its promising applications. Although the mechanism involved remains unproven, the chemical reduction of readily available exfoliated graphite oxide (GO) with reducing agents such as hydrazine and dimethylhydrazine is a promising strategy in the large-scale production of graphene. Unfortunately, the reducing agents involved are very hazardous, and the graphene obtained presents irreversibly agglomerated features in solvents that do not contain polymer surfactants. Here, we report a new green route for the synthesis of processable graphene on a large scale. We observed that a stable graphene suspension could be quickly prepared by simply heating an exfoliated-GO suspension under strongly alkaline conditions at moderate temperatures (50–90 8C) (Figure 1a). Our initial purpose was to introduce functional groups to exfoliated GO by free-radical addition. Surprisingly, the addition of NaOH to the GO suspension – to improve the solubility of the alkyl free-radical initiator, which is carboxyl-terminated – was accompanied by a fast, unexpected color change (from yellow-brown to homogeneous black). Careful experiments revealed that exfoliated GO can undergo fast deoxygenation in strongly alkaline solutions, resulting in stable aqueous graphene suspensions

1,655 citations

Journal ArticleDOI
01 Aug 2011-Carbon
TL;DR: In this article, the properties of hydrazine-reduced graphite oxide (GO) particles were analyzed by elemental analysis, XPS, TGA, XRD, and SEM.

1,402 citations