Study of Ni2+/Ni3+ Redox Couple and Electrocatalytic Responses of Ni on Nitrogen-Doped Carbon for Urea Non-Enzymatic Detection

A novel redox couple of metallic nickel (Ni) catalyst can become a great candidate of non-enzymatic detection. By taking advantage of fast electron transfer, Ni redox couples can be tailored as pseudo-enzyme in urea measurement. In this study, Ni catalyst on nitrogen doped carbon (Ni-NC) was synthesized and characterized morphological, elemental, and electrocatalytic properties in comparison to different configuration of pure nickel (Ni), Ni with carbon (Ni-C), and bare carbon electrode, assessed by cyclic voltammetry and differential pulse voltammetry. By examining various Ni redox couples in rapid electron transfer process, the prominent anodic and cathodic peaks of Ni2+/Ni3+ were applicable to detect urea in the detection range of 1-20 mM, with an excellent sensitivity and relative standard deviation of 1.634 μA.mM-1 (R2 of 0.989) and 4.89%, respectively. Therefore, Ni-NC can find practical applications for material sensing device toward non-enzymatic urea measurement.

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The oxygen reduction reaction of two electron transfer of nitrogen-doped carbon in the electro-Fenton system

New Journal of Chemistry ◽

10.1039/d0nj03298k ◽

2020 ◽

Vol 44 (38) ◽

pp. 16584-16593

Author(s):

Jiayi Feng ◽

Yonggang Zhang

Keyword(s):

Electron Transfer ◽

Oxygen Reduction Reaction ◽

Cathode Material ◽

Degradation Mechanism ◽

Reduction Reaction ◽

Nitrogen Doped ◽

System P ◽

Nitrogen Doped Carbon ◽

Fenton System ◽

Ti Mesh

Degradation mechanism of ORR for the NGO-Ti mesh cathode material in the EF process.

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Enhancing the activation of persulfate using nitrogen-doped carbon materials in the electric field for the effective removal of p-nitrophenol

RSC Advances ◽

10.1039/d1ra06691a ◽

2021 ◽

Vol 11 (60) ◽

pp. 38003-38015

Author(s):

Mengdi Tang ◽

Yonggang Zhang

Keyword(s):

Electron Transfer ◽

Free Radical ◽

Electric Field ◽

Carbon Materials ◽

Direct Electron Transfer ◽

Free Radical Oxidation ◽

Radical Oxidation ◽

Nitrogen Doped ◽

Effective Removal ◽

Nitrogen Doped Carbon

In the process of electro-activation of PDS by carbon cathode, PNP was removed from water mainly through SO4˙− produced by cathode, ˙OH and 1O2 produced indirectly, direct electron transfer and non-free radical oxidation of anode.

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Green Preparation of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Sensitive Detection of Oxytetracycline in Environmental Samples

Nanomaterials ◽

10.3390/nano10081561 ◽

2020 ◽

Vol 10 (8) ◽

pp. 1561

Author(s):

Rong Gao ◽

Zhibin Wu ◽

Li Wang ◽

Jiao Liu ◽

Yijun Deng ◽

...

Keyword(s):

Quantum Dots ◽

Tap Water ◽

Orange Peel ◽

Carbon Quantum Dots ◽

Sensitive Detection ◽

Biomass Waste ◽

Visible Absorption ◽

Nitrogen Doped ◽

Relative Standard ◽

Nitrogen Doped Carbon

Nitrogen-doped carbon quantum dots (N-CQDs) with strong fluorescence were prepared by a one-step hydrothermal method using natural biomass waste. Two efficient fluorescent probes were constructed for selective and sensitive detection of oxytetracycline (OTC). The synthesized N-CQDs were characterized by UV-visible absorption spectra, fluorescence spectra, Fourier transform infrared spectroscopy (FT-IR), X-ray photon spectroscopy (XPS), atomic force microscopy (AFM), and high-resolution transmission electron microscopy (HRTEM), which proved that the synthesized N-CQDs surface were functionalized and had stable fluorescence performance. The basis of N-CQDs detection of OTC was discussed, and various reaction conditions were studied. Under optimized conditions, orange peel carbon quantum dots (ON-CQDs) and watermelon peel carbon quantum dots (WN-CQDs) have a good linear relationship with OTC concentrations in the range of 2–100 µmol L−1 and 0.25–100 µmol L−1, respectively. ON-CQDs and WN-CQDs were both successfully applied in detecting the OTC in pretreated tap water, lake water, and soil, with the recovery rate at 91.724–103.206%, and the relative standard deviation was less than 5.35%. The results showed that the proposed N-CQDs proved to be green and simple, greatly reducing the detection time for OTC in the determination environment.

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