Electrochemical Detection Of Catechol Research Articles

Waste hazelnut shell based effective hydrothermal carbon/SnO2 nanoparticles: Towards electrochemical sensing of catechol in green tea, fruit juice, and urine samples

This study focused on the electrochemical detection of catechol (CC), a carcinogenic for humans and a periodic environmental pollutant found in consumed food and beverages and has low degradability and high toxicity in the ecological environment. Also, in this study, for the first time, a new and green electrochemical detection platform was developed for the detection of CC through green carbon material (HZ) recycled from waste hazelnut shells with the hydrothermal carbonization technique (HTC) and SnO2 nanoparticles (NPs). The morphology, surface chemistry, chemical structure, and physicochemical properties of the synthesized green-based functional carbon material and SnO2 NPs were thoroughly investigated and elucidated using different characterization techniques. Thus, a green perspective was contributed to the studies of researchers working on CC detection in designing new types of nanosensors and developing electrode modifications. On GCE with an HZ-SnO2 modification, the effects of pH, the supporting electrolyte, and the scan rate on the electrochemical behavior of CC were investigated. The limit of detection (LOD) of the proposed nanosensor for CC was determined as 8.51 nM and the linearity range was determined as 0.80–80 µM under optimal conditions using adsorptive stripping differential pulse voltammetry (AdsDPV).The developed new type, the green method, has been performed to detect the CC in green tea, fruit juice, and urine samples with sufficient accuracy and precision.

Tuning pore structure and specific surface area of graphene frameworks via one-step fast pyrolysis strategy: Impact on electrochemical sensing behavior of catechol

Rational design porous nanomaterials with high specific surface area (SSA) have become an effective approach to improve their electrocatalytic activity, and thus enhancing the electrochemical sensing performance. However, increasing of SSA generally accompanied by magnifying the background current signal, which results in the electrochemical sensors may not achieve the optimal sensing performance. For porous nanomaterials, not only the appropriate SSA but also the pore size probably impacts the electrochemical sensing performance, while this aspect has seldomly studied in electrochemical sensor. Herein, the different SSA and pore size of graphene frameworks (GFs) are successfully synthesized by adjusting the ratio of the mixture of glucose and Na2CO3 via one-step fast pyrolysis process. The tailored GFs has been used as electrode material for constructing non-enzymic electrochemical sensor with catechol (CC) used as model analyte. Electrochemical analysis result suggests that GFs with the highest SSA do not obtain the best behavior, while GFs with abundant hierarchical pore structure and relatively large SSA can achieve the best performance. The optimized GFs as electrode materials for electrochemical detection of CC exhibit a low detection limit of 0.19 μM, and a relatively wide linear range between 1 and 201 μM. This work provides a guide for developing new porous carbon materials for electrochemical sensor with better performance.

Temperature-controlled electrochemical sensor based on environmentally responsive polymer/BiPO4/BiOCl/multi-walled carbon nanotube composite for the detection of catechol in water

Catechol is a phenolic environmental pollutant that is highly toxic to living organisms and is released into the environment, where it is difficult to degrade in the ecosystem, thereby contaminating the environment and groundwater. Here, P(NIPAM-co-BMA)/BiPO4/BiOCl/MWCNTs nanocomposites were synthesized, and a temperature-controlled "on/off" electrochemical sensor was constructed. In addition, the P(NIPAM-co-BMA)/BiPO4/BiOCl/MWCNTs/GCE sensor shows good thermal sensitivity and electrochemical detection of catechol. Reproducible "on/off" switching on the CVs curve can be achieved by controlling the temperature of the solution. Under optimal conditions, the sensor was able to detect catechol in the linear range of 0.5–86.51 μM with a limit of detection of 0.2 μM (S/N = 3). Satisfactory results were obtained for the detection of natural environmental samples (tap water). In addition, the redox mechanism and electrochemical reaction sites of catechol were investigated by scanning rates. This work demonstrates for the first time the combination of temperature-sensitive polymers, bismuth-based compounds and multi-walled carbon nanotubes as electrochemical sensors for the detection of catechol, opening a new window for the sensitive detection of catechol. At the same time, the constructed switch-like electrochemical sensors can be better applied to different special scenarios.

In situ polymerization synthesis of polyaniline/strontium niobate nanocomposite for highly sensitive electrochemical detection of catechol

In situ polymerization synthesis of polyaniline/strontium niobate nanocomposite for highly sensitive electrochemical detection of catechol

Electrochemical determination of harmful catechol and rapid decolorization of textile dyes using ceria and tin doped ZnO nanoparticles

Electrochemical sensing of toxic pollutants as well as the degradation of toxic dyes using cost effective nanoparticles-based photocatalyst are one of the most effective ways to reduce environmental contaminants. Herein, ZnO and different percentage (1, 3, 5 & 10%) of Ce and Sn doped ZnO nanoparticles were synthesized by a facile chemical method. The synthesized nanoparticles were used as modified electrode towards electrochemical detection of catechol (CA). It was found that the limit of detection and the sensitivity of the Ce/ZnO (5%) to be 0.21 μM and 0.494 μM μA−1, respectively. The doped ZnO exhibited lower band gap compared to pure ZnO, which facilitates to rapid photocatalytic degradation (~93%) of textile dyes (Crystal Violet & Rhodamine B) and catechol under visible light radiation. The environmental pollutants such as catechol, crystal violet and rhodamine B dye were effectively determined and degraded very successfully using couple of techniques such as cyclic voltametric and photodegradation.

An efficient amperometric catechol sensor based on novel polypyrrole-carbon black doped α-Fe2O3 nanocomposite

Catechol reacts with a variety of biomolecules including DNA, proteins, membranes, etc. and thus causes irreparable damage to human health. Therefore, herein a highly sensitive and selective electrochemical catechol (CC) sensor based on a novel polypyrrole/carbon black doped α-Fe2O3 nanocomposite (PPy/CB/α-Fe2O3 NCs) modified glassy carbon electrode (GCE) is developed and demonstrated. The structural and morphological properties of the PPy/CB/α-Fe2O3 NCs were investigated by FESEM, TEM, EDS, XPS, XRD, FTIR, and Raman spectroscopy. This newly designed highly-sensitive PPy/CB/α-Fe2O3/GCE-based electrochemical sensor can measure a wide range of CC (0.5–1188 μM) in phosphate buffer solution (PBS) with a sensitivity of 0.3521 μAμM−1cm−2 and a logical limit of detection (LOD) 52.8 ± 0.1 nM. The selectivity of the proposed CC sensor was also examined in the presence of common interfering substances. Furthermore, the CC sensor electrode showed highly acceptable results towards the detection of CC level in real samples analysis by the standard addition method. This new combination of active materials, PPy/CB/α-Fe2O3 modified GCE exhibited excellent reproducibility, repeatability, and long-term stability during the electrochemical detection of catechol. Therefore, this approach will emerge as an effective technique in developing efficient electrochemical sensors to detect phenolic compounds for environmental safety.

Preparation and Characterization of Highly Flexible, Free‐Standing, Three‐Dimensional and Rough NiMOF/rGO Composite Paper Electrode for Determination of Catechol

AbstractThe flexible, free‐standing and durable highly rough nickel metal‐organic framework/reduced graphene oxide (NiMOF/rGO) composite paper electrode was prepared with a simple electrochemical deposition of NiMOF structures on the surface of the rGO paper electrode. NiMOF/rGO composite paper electrode was characterized by using scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques. As‐prepared NiMOF/rGO composite paper was used in the electrochemical detection of catechol (CC). The rough and flower‐like three‐dimensional (3D) NiMOF nanostructures on the rGO paper electrode surface greatly increased the catalytic performance of the paper electrode by providing a large active surface area. CC was detected on NiMOF/rGO composite paper in a very wide linear range from 0.02 to 760 μM, a low detection limit of 1.8 nM (S/N=3), with a high sensitivity of 0.158 mA μM cm−2 and very high selectivity, especially in the presence of phenol‐derived materials. Furthermore, it was determined that NiMOF/rGO composite paper also had high stability, flexibility, and durability, which may enable this material to be used in‐vivo applications.

Gold Nanoparticle/Chitosan@N,S Co-doped Multiwalled Carbon Nanotubes Sensor: Fabrication, Characterization, and Electrochemical Detection of Catechol and Nitrite

Given that catechol and nitrite can be easily released into the environment and cause serious damage to our physical and ecological environment, it is necessary to develop a fast and reliable detection method for catechol and nitrite analysis. In our work, an electrochemical catechol and nitrite sensor was created based on gold nanoparticles (AuNPs) deposited on chitosan@N,S co-doped multiwalled carbon nanotubes (CS@N,S co-doped MWCNTS) composite modified glassy carbon electrode. The preliminary prepared composite materials were characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The AuNPs/CS@N,S co-doped MWCNTS modified electrode shows a good linear relationship between 1 μmol·L–1 (μM) and 5000 μM for catechol, and the detection limit was calculated as 0.2 μM. For nitrite the linear relationship was 1–7000 μM with the detection limit of 0.2 μM. The sensitivity of the created sensor was evalua...

One-Pot Hydrothermal Preparation of SnO<SUB>2</SUB>–ZnO Nanohybrids for Simultaneous Electrochemical Detection of Catechol and Hydroquinone

One-Pot Hydrothermal Preparation of SnO<SUB>2</SUB>–ZnO Nanohybrids for Simultaneous Electrochemical Detection of Catechol and Hydroquinone

Investigation of morphologies and characterization of rare earth metal samarium hexacyanoferrate and its composite with surfactant intercalated graphene oxide for sensor applications

Different morphologies of electrochemically deposited samarium hexacyanoferrate.

Electrochemical Detection of Catechol on Boron‐doped Diamond Electrode Modified with Au/TiO2 Nanorod Composite

AbstractAu/TiO2 nanorod composites with different ratios of [TiO2]:[Au] have been prepared by chemically reducing AuCl4‐ on the positively charged TiO2 nanorods surface and used to modify boron‐doped diamond (BDD) electrodes. The electrochemical behaviors of catechol on the bare and different Au/TiO2 nanorod composites‐modified BDD electrodes are studied. The cyclic voltammetric results indicate that these different Au/TiO2 nanorod composites‐modified BDD electrodes can enhance the electrocatalytic activity toward catechol detection, as compared with the bare BDD electrode. Among these different conditions, the Au/TiO2‐BDD3 electrode (the ratio of [TiO2]:[Au] is 27:1) is the most choice for catechol detection. The electrochemical response dependences of the Au/TiO2‐BDD3 electrode on pH of solution and the applied potential are studied. The detection limit of catechol is found to be about 1.4 × 10‐6 M in a linear range from 5 × 10‐6 M to 200 × 10‐6 M on the Au/TiO2‐BDD3 electrode.

Electrochemical detection of catechol at integrated carbon nanotubes electrodes

The mechanical stability of the electrode plays a very important role in the long-term stability of electrochemical behavior. In this paper, multi-wall carbon nanotubes (MWCNTs) electrodes were prepared in the holes of glass directly by microwave plasma chemical vapor deposition and the electrochemical behavior of catechol at the integrated MWCNT electrodes was investigated. The oxygen plasma treated CNTs had excellent electrochemical behavior for the analysis of catechol. The catechol was detected in the linear concentration range of 1.0 × 10 − 6 mol L − 1 –1.0 × 10 − 3 mol L − 1 . And because CNTs were integrated directly on the substrate, the stable response to catechol solution showed that the carbon nanotubes electrodes had long-term stability.

Electrochemical detection of catechol and dopamine as their phenylboronate ester derivatives

By virtue of its reaction with phenylboronic acid to form a boronate ester, dopamine can be detected electrochemically in aqueous solutions, at physiological pH, in the presence of excess ascorbic acid.