FLOWER-LIKE NANOPARTICLES OF Pt–BiIII ASSEMBLED ON AGMATINE SULFATE MODIFIED GLASSY CARBON ELECTRODE AND THEIR ELECTROCATALYSIS OF H2O2

2015 ◽  
Vol 22 (03) ◽  
pp. 1550043 ◽  
Author(s):  
MINGSHU XIAO ◽  
YUHUA YAN ◽  
KAI FENG ◽  
YANPING TIAN ◽  
YUQING MIAO
Keyword(s):  
Electron Microscopy ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Pt Nanoparticles ◽  
Standard Addition ◽  
Electrochemical Technique ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Addition Method ◽  
Scanning Electron

A new electrochemical technique to detect hydrogen peroxide ( H 2 O 2) was developed. The Pt nanoparticles and Bi III were subsequently assembled on agmatine sulfate (AS) modified glassy carbon electrode (GCE) and the prepared GCE–AS- Pt – Bi III was characterized by scanning electron microscopy (SEM) with result showing that the flower-like nanostructure of Pt – Bi III was yielded. Compared with Pt nanoparticles, the flower-like nanostructure of Pt – Bi III greatly enhanced the electrocatalysis of GCE–AS- Pt – Bi III towards H 2 O 2, which is ascribed to more Pt – OH obtained on GCE–AS- Pt – Bi III surface for the presence of Bi III . Based on its high electrocatalysis, GCE–AS- Pt – Bi III was used to determine the content of H 2 O 2 in the sample of sheet bean curd with standard addition method. Meantime, its electrocatalytic activity also was studied.

scholarly journals Bismuth and Bismuth-Chitosan modified electrodes for determination of two synthetic food colorants by net analyte signal standard addition method

2014 ◽  
Vol 12 (6) ◽  
pp. 711-718 ◽  
Author(s):  
Karim Asadpour-Zeynali ◽  
Fariba Mollarasouli
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Standard Addition ◽  
Carbon Electrode ◽  
Bismuth Film ◽  
Modified Glassy Carbon Electrode ◽  
Addition Method ◽  
Sunset Yellow ◽  
Analyte Signal

AbstractIn this paper, an electrochemical application of bismuth film modified glassy carbon electrode for azo-colorants determination was investigated. Bismuth-film electrode (BiFE) was prepared by ex-situ depositing of bismuth onto glassy carbon electrode. The plating potential was −0.78 V (vs. SCE) in a solution of 0.15 mg mL−1 Bi(III) and 0.05 mg mL−1 KBr for 180 s. In the next step, a thin film of chitosan was deposited on the surface of bismuth modified glassy carbon electrode, thus the bismuth-chitosan thin film modified glassy carbon electrode (Bi-CHIT/GCE) was fabricated and compared with bare GCE and bismuth modified GCE.Azo-colorants such as Sunset Yellow and Carmoisine were determined on these electrodes by differential pulse voltammetry. Due to overlapping peaks of Sunset Yellow and Carmoisine, simultaneous determination of them is not possible, so net analyte signal standard addition method (NASSAM) was used for this determination. The results showed that coated chitosan can enhance the bismuth film sensitivity, improve the mechanical stability without caused contamination of surface electrode. The Bi-CHIT/GC electrode behaved linearly to Sunset Yellow and Carmoisine in the concentration range of 5×10−6 to 2.38×10−4 M and 1×10−6 to 0.41×10−4 M with a detection limit of 10 µM (4.52 µg mL−1) and 10 µM (5.47 µg mL−1), respectively

ANCHOR OF Ni2+ ON THE AGMATINE SULFATE-MODIFIED ELECTRODES FOR THE DETERMINATION OF H2O2 IN FOOD

2016 ◽  
Vol 24 (01) ◽  
pp. 1750008
Author(s):  
YUHUA YAN ◽  
ZHONGHUI ZHANG ◽  
MINGSHU XIAO ◽  
HUALAN ZHOU
Keyword(s):  
Hydrogen Peroxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Thin Sheet ◽  
Modified Electrodes ◽  
Standard Addition ◽  
Carbon Electrode ◽  
Addition Method ◽  
Nickel Ion

A method was developed to conveniently and rapidly determine hydrogen peroxide (H2O2) in food. The glassy carbon electrode (GCE) modified with agmatine sulfate (AS) easily anchoring nickel ion was attached to AS with polyamine structure. As a result, more Ni[Formula: see text] was obtained and transformed to Ni(OH)2/NiOOH on the AS–GCE, which caused the electrode to own much better electrocatalytic performance on H2O2. Based on these, the content of H2O2 in thin sheet of bean curd sample was detected with standard addition method, by which good results were obtained.

Synthesis of Polyaniline/Graphene Nanocomposites and Electrochemical Sensing Performance for Formaldehyde

2020 ◽  
Vol 16 (4) ◽  
pp. 493-498
Author(s):  
Lizhai Pei ◽  
Yue Ma ◽  
Fanglv Qiu ◽  
Feifei Lin ◽  
Chuangang Fan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Sensing ◽  
Polymerization Process ◽  
Great Effort ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Liquid Environment ◽  
Graphene Nanocomposites

Background: Formaldehyde has been recognized as the important liquid environmental pollutant which can cause health risk. Great effort has been devoted to detecting formaldehyde in liquid environment. It is of important significance to develop a sensitive method for measuring formaldehyde from the environmental and health viewpoints. Methods: Polyaniline/graphene nanocomposites have been prepared by a simple in-situ polymerization process using graphene and aniline as the raw materials. The nanocomposites were characterized by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) and high-resolution TEM (HRTEM). The polyaniline/graphene nanocomposites were applied to modify the glassy carbon electrode for the detection of formaldehyde by cyclic voltammetry (CV) method. Results: The polyaniline/graphene nanocomposites consist of hexagonal graphite phase. The polyaniline particles are dispersed and attached to the surface of the graphene nanosheet-shaped morphology. The thickness of the graphene nanosheets is less than 50 nm. The electrocatalytic performance of the polyaniline/graphene nanocomposites modified glassy carbon electrode towards formaldehyde was obtained. The potential of the irreversible oxidation peak is located at +0.19 V. The polyaniline/graphene nanocomposites modified glassy carbon electrode shows a wide linear range of 0.0001-2 mM and low detection limit of 0.085 μM. Conclusion: The nanocomposites modified glassy carbon electrode possesses good reproducibility and stability. The polyaniline/graphene nanocomposites show great application potential for the electrochemical sensors to detect formaldehyde in liquid environments.

scholarly journals Au-PDA@SiO2 core-shell nanospheres decorated rGO modified electrode for electrochemical sensing of cefotaxime

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. Z. H. Khan ◽  
M. Daizy ◽  
C. Tarafder ◽  
X. Liu
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Modified Electrodes ◽  
Core Shell ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene

AbstractIn this work, we have successfully synthesized core-shell structured Au-PDA@SiO2 nanospheres and decorated on reduced graphene oxide (rGO) modified glassy carbon electrode for the electrochemical detection of cefotaxime. The one-pot hydrothermal method was used to synthesis core-shell nanostructures by loading Au nanoparticles on polydopamine (PDA) coated SiO2 nanospheres. The as-prepared Au-PDA@SiO2 nanospheres were used to fabricate electrochemically reduced graphene oxide (rGO) modified glassy carbon electrode (Au-PDA@SiO2/rGO/GCE) for electrochemical determination of cefotaxime. Scanning electron microscopy, powder x-ray diffraction, transmission electron microscopy, and Fourier-transform infrared spectroscopy were used to confirm the structure and morphology of the as-prepared nanospheres. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were performed for electrochemical characterizations different modified electrodes. It was revealed that the nanocomposite modified electrodes exhibited excellent electrochemical performances for electrooxidation of target analytes and could achieve ultra-sensitive detections. A linear relationship was observed between peak currents and concentrations in the ranges of 1.0 × 10−9 to 5.0 × 10−8 M (R2 = 0.9877), and 1.0 × 10−7 to 5.0 × 10−6 M (R2 = 0.9821) for cefotaxime with a detection limit (S/N = 3) of 1.0 × 10−10 M. It can be deduced that the proposed sensor is suitable for the sensitive detection of cefotaxime in pharmaceutical samples.

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