Facile and Ultrasensitive Determination of 4-Nitrophenol Based on Acetylene Black Paste and Graphene Hybrid Electrode

He, Quanguo; Tian, Yaling; Wu, Yiyong; Li, Jun; Li, Guangli; Deng, Peihong; Chen, Dongchu

doi:10.3390/nano9030429

Cited by 122 publications

(68 citation statements)

References 45 publications

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“…Cyclic voltammetry is widely used to analyze the electrocatalytic activities of CEs. [37][38][39] As shown in Fig. 4, two pairs of redox signals were observed for both the Pt-and the 3DGN-RGO-based CEs.…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional graphene networks and RGO-based counter electrode for DSSCs

Huang

Sun

et al. 2019

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Three-dimensional graphene networks and RGO-based counter electrode for DSSCs

Huang

Sun

et al. 2019

RSC Adv.

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“…The high hydrogen evolution can dramatically modify the pH on the electrode interface, promoting the formation mainly of azoxybenzene or aniline. Note that acid conditions are required to assure the formation of 4-AP as a result of the nucleophilic attack by water at the protonated 4-HAP [1,20,[34][35][36][37][38][39]. However, the structural elucidation of the formed by-products is out of the scope of the present study as they are formed in non-adequate working conditions for 4-NP reduction.…”

Section: Influence Of the Applied Potentialmentioning

confidence: 96%

“…Once 4-HAP is formed in acidic media, it can Catalysts 2020, 10, 458 4 of 12 rearrange itself into 4-AP. Therefore, acidic conditions favors the electroreduction of 4-NP to 4-HAP as well as the transformation of 4-HAP to 4-AP [34][35][36][37].…”

Section: Preliminary Voltammetric Studymentioning

confidence: 99%

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Simple Environmentally-Friendly Reduction of 4-Nitrophenol

et al. 2020

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The low molecular-mass organic compound 4-nitrophenol is involved in many chemical processes and is commonly present in soils and in surface and ground waters, thereby causing severe environmental impact and health risk. Several methods have been proposed for its transformation (bio and chemical degradation). However, these strategies not only produce equally or more toxic aromatic species but also require harsh operating conditions and/or time-consuming treatments. In this context, we report a comprehensive and systematic study of the electrochemical reduction of 4-nitrophenol as a viable alternative. We have explored the electrochemical reduction of this pollutant over different metallic and carbonaceous substrata. Specifically, we have focused on the use of gold and silver working electrodes since they combine a high electrocatalytic activity for 4-nitrophenol reduction and a low electrocatalytic capacity for hydrogen evolution. The influence of the pH, temperature, and applied potential have also been considered as crucial parameters in the overall optimization of the process. While acidic media and high temperatures favor the clean reduction of 4-nitrophenol to 4-aminophenol, the simultaneous hydrogen evolution is pernicious for this purpose. Herein, a simple and effective electrochemical method for the transformation of 4-nitrophenol into 4-aminophenol is proposed with virtually no undesired by-products.

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“…Chemical modification of electrodes with suitable materials could solve these problems. Commonly, many nano structure materials such as polymer a nanocomposite [20][21][22][23][24][25], metal nanoparticles [26][27][28], and graphene nanocomposite [15,[29][30][31][32][33][34][35] have been introduced to enhance the electrode performance.…”

Section: Introductionmentioning

confidence: 99%

Application of carboxylic acid-functionalized of graphene oxide for electrochemical simultaneous determination of tryptophan and tyrosine in milk

Fooladi¹,

Razavizadeh²,

Noori³

et al. 2020

SN Appl. Sci.

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In this work, a new method for the simultaneous determination of tryptophan (Trp) and tyrosine (Tyr) in milk has been reported. Trp and Tyr are essential amino acids in human nutrition, but their electrochemical signal overlapped. For solve this problem, we developed modified Screen Printed Carbon Electrode (SPCE) with Graphene Oxide-COOH/Chitosan (GO-COOH/Chitosan) electro-deposition. The morphology and electrochemical performance of modified electrode were characterized by scanning electron microscopy, energy dispersive spectrometry, FT-IR, electrochemical impedance spectroscopy and cyclic voltammetry. The electrochemical simultaneous determination of Trp and Tyr has been investigated by using differential pulse voltammetry. The carboxylic acid functionalized GO modified SPCE was utilized to catalyze the oxidation of Trp and Tyr. Compared with SPCE/GO/Chitosan and SPCE/Chitosan sensor, the new sensor has enhanced sensitivity, low detection limit and high selectivity. In addition, the SPCE/GO-COOH-Chitosan sensor enhanced separation of the oxidation peak of Tyr and Trp and showed a remarkable increase in peak current for electroactive compounds, thus, it can be used for simultaneous voltammetric determination. Under the optimized experimental conditions, a linear correlation between oxidation peak current and concentration of Tyr and Trp in the ranges 0.1-60 µM and 0.4-40 µM with a detection limit of 0.05 µM (S/N = 3) and 0.1 µM (S/N = 3) were achieved, respectively. Finally, the proposed electrochemical sensor was applied for quantification of Tyr and Trp in milk samples, where standard solutions were spiked to the milk samples and recoveries were obtained.

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Facile and Ultrasensitive Determination of 4-Nitrophenol Based on Acetylene Black Paste and Graphene Hybrid Electrode

Cited by 122 publications

References 45 publications

Three-dimensional graphene networks and RGO-based counter electrode for DSSCs

Three-dimensional graphene networks and RGO-based counter electrode for DSSCs

Simple Environmentally-Friendly Reduction of 4-Nitrophenol

Application of carboxylic acid-functionalized of graphene oxide for electrochemical simultaneous determination of tryptophan and tyrosine in milk

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