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Alkali cobalt carbonate nanometer material for electrochemical sensor and preparation method and application of basic cobalt carbonate nanometer material

A cobalt carbonate nanometer and sensor technology, applied in cobalt carbonate, material electrochemical variables, material analysis by electromagnetic means, etc., can solve the problem of poor detection reproducibility and stability, easy to be interfered by other substances, low sensitivity of cadmium ions, etc. problems, to achieve the effects of easy analysis, improved electrochemical response, and strong anti-interference

Pending Publication Date: 2022-05-27
SHANGHAI UNIV OF MEDICINE & HEALTH SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a basic cobalt carbonate nanomaterial for electrochemical sensors and its preparation method and application, so as to overcome the low sensitivity of the detection method of cadmium ions in the prior art, which is easily interfered by other substances, and the detection is reproducible. Poor performance and stability, complex sample pretreatment, complex operation process or high cost, etc.

Method used

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  • Alkali cobalt carbonate nanometer material for electrochemical sensor and preparation method and application of basic cobalt carbonate nanometer material
  • Alkali cobalt carbonate nanometer material for electrochemical sensor and preparation method and application of basic cobalt carbonate nanometer material
  • Alkali cobalt carbonate nanometer material for electrochemical sensor and preparation method and application of basic cobalt carbonate nanometer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Synthesis and characterization of basic cobalt carbonate nanomaterials:

[0052] Dissolve 0.87g of cobalt nitrate hexahydrate, 0.9g of urea and 0.22g of ammonium fluoride in 80mL of deionized water, transfer the well-stirred solution to the reaction kettle, and place it in a 120°C atmospheric oven to react for 4 hours and 6 hours, respectively. and 8 hours, cooled to room temperature, taken out, centrifuged the sample (8000r / min) for 10 minutes, washed three times with deionized water and ethanol, and dried at 80 °C for 4 hours under normal pressure to obtain a purple-red powder, that is, prepared Three basic cobalt carbonate nanomaterials with different particle sizes (CoCH-4h, CoCH-6h, CoCH-8h).

[0053] The morphology, lattice structure and chemical composition of CoCH materials synthesized at different preparation times were characterized by scanning electron microscope-X-ray energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD).

[0054] In order to...

Embodiment 2

[0060] Preparation of basic cobalt carbonate modified electrode:

[0061] Take a little alumina powder (0.3μm and 0.05μm) on the chamois, add double distilled water to make it into a suspension, grind and polish the glassy carbon electrode (GCE) until the mirror surface is smooth, and then rinse the glassy carbon electrode with double distilled water The surface was cleaned until clean, followed by ultrasonic cleaning with acetone, nitric acid (1:1, v / v), NaOH aqueous solution (50%, w / w), double distilled water and ethanol, and then dried under infrared light for use. Take 1 mg of each of the three basic cobalt carbonate nanomaterials prepared in Example 1, then add 200 μL of ethanol respectively, and ultrasonically mix them evenly to obtain CoCH-4h solution, CoCH-6h solution, and CoCH-4h solution with a concentration of 5 μg / μl. 8h solution, respectively take 3 μL of the obtained solution and drop it on the glassy carbon electrode (diameter 3mm) treated above (the drop coatin...

Embodiment 3

[0063] The electrochemical behavior of the basic cobalt carbonate modified electrode prepared in Example 2 was evaluated:

[0064] image 3 For CoCH-4h / GCE, CoCH-6h / GCE, CoCH-8h / GCE at 5 mmol·L -1 K 3 [Fe(CN) 6 ] / K 4 [Fe(CN) 6 ] 0.1mol·L -1 The CV scanning diagram in the KCl solution of the modified electrode can determine the electrochemical performance of the modified electrode by studying the difference in the magnitude of the redox peak current and the peak potential presented by different electrodes. like image 3 As shown, with the increase of synthesis time, Fe 2+ / Fe 3+ The redox peak current of the electrode pair on CoCH gradually increases, and the redox peak potential difference (ΔEp) also gradually decreases, indicating that the CoCH-8h modified electrode has the strongest catalytic effect on the redox reaction, and the redox reaction on the surface of the electrode has the strongest effect. Reversibility is the best. Combining the characterization result...

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Abstract

The invention relates to a basic cobalt carbonate nano material for an electrochemical sensor and a preparation method and application thereof, and the basic cobalt carbonate nano material is prepared by the following steps: dissolving a cobalt source, urea and ammonium fluoride in deionized water, and then reacting, centrifuging, washing and drying to obtain a target product. The material is of a nanorod-shaped structure and is large in specific surface area, so that Cd < 2 + > is adsorbed more easily, the sensitivity of Cd < 2 + > measurement is improved, meanwhile, the electron transfer speed can be increased through the large specific surface area, the electrochemical response of the material is improved, and Cd < 2 + > can be detected more efficiently and sensitively; the modified electrode obtained by compounding the basic cobalt carbonate nano material and GCE has specific adsorption capacity on Cd < 2 + >. Compared with the prior art, the method has the advantages that efficient and quantitative detection of Cd < 2 + > is realized by adopting SWV based on the basic cobalt carbonate nano material, the detection method is sensitive and rapid, the operation steps are simple and convenient, the anti-interference performance, reproducibility and stability are high, complex sample pretreatment is not needed, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, and relates to a basic cobalt carbonate nanomaterial for electrochemical sensors and a preparation method and application thereof. Background technique [0002] Cadmium, as one of the heavy metal pollutions, cannot be biodegraded, so it is not only easy to accumulate in animals and plants, but also accumulates in the human body through the food chain, causing diseases such as osteoarthritis, spontaneous fracture, elevated blood pressure and myocardial dysfunction. Once it reaches a certain value, it will cause irreversible damage to people's health such as teratogenicity and cancer. Therefore, to establish a method with low detection limit and good selectivity, for Cd in actual samples 2+ The measurement of trace quantity has very important practical significance and application value. [0003] At present, common methods for the detection of cadmium ions include X-ray fluorescen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/06G01N27/30G01N27/48B82Y40/00
CPCC01G51/06G01N27/308G01N27/48B82Y40/00C01P2002/72C01P2004/03C01P2006/40
Inventor 梁莹林佳妮蔡鑫如黄琳琰李晨烨徐一新
Owner SHANGHAI UNIV OF MEDICINE & HEALTH SCI
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