MXene composite membrane modified electrode and electrochemical identification of MXene composite membrane modified electrode on methionine enantiomer

A technology for modifying electrodes and composite membranes, which is applied in the fields of electrochemical variables of materials, scientific instruments, and material analysis through electromagnetic means, and can solve problems such as insufficient exposure of catalytic active sites, limited development of hydrotalcite-like in depth, and poor conductivity , to achieve the effect of increasing active interface sites, improving electrochemical performance and good selectivity

Inactive Publication Date: 2021-11-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LDH itself has defects such as easy aggregation, poor conductivity, and insufficient exposure of catalytic active sites. Exfoliating it into LDH ultrathin nanosheets can increase its specific surface area and fully expose its catalytic sites, thereby improving its electrochemical catalytic performance.
However, the exfoliated LDH ultra-thin nanosheets are easy to aggregate and return to the bulk state of LDH in aqueous media, and can only be used in the form of colloidal solutions, which greatly limits the in-depth development of hydrotalcites in the field of electrochemistry.

Method used

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  • MXene composite membrane modified electrode and electrochemical identification of MXene composite membrane modified electrode on methionine enantiomer
  • MXene composite membrane modified electrode and electrochemical identification of MXene composite membrane modified electrode on methionine enantiomer
  • MXene composite membrane modified electrode and electrochemical identification of MXene composite membrane modified electrode on methionine enantiomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (a) Preparation of MXene materials

[0031] Prepare 30mL of 6M HCl solution in a Teflon beaker, add 1.98g LiF, mix well; slowly add 3g Ti 3 AlC 2 powder, keep stirring during the addition process; keep the reaction mixture at 40°C for 45h, centrifuge and wash until the pH of the supernatant is 6; freeze-dry to obtain Ti 3 C 2 T x MXene, hereinafter referred to as MXene;

[0032] (b) Preparation of MXene@LDHNS

[0033] Disperse MXene (0.04g) into 10mL deionized water, sonicate it for 2h to peel it off, centrifuge at 3500rpm for one hour, discard the precipitate, and mix the obtained upper layer solution with Co(NO 3 ) 2 ·6H 2 O(0.291g), Al(NO 3 ) 3 9H 2 O (0.1875g) and ammonium fluoride (0.1675g) were dispersed in 55mL of deionized water and stirred evenly; 1M ammonia water (4.5mL) was added dropwise to the mixed solution; the suspension was stirred at room temperature for 1.5h and aged for 2.5 h The resulting MXene@LDHNS was washed with distilled water and et...

Embodiment 2

[0039] (a) Preparation of MXene materials

[0040] Prepared according to the method and conditions of step (a) in Example 1;

[0041] (b) Preparation of MXene@LDHNS

[0042] Prepared according to the method and conditions of step (b) in Example 1;

[0043] (c) Preparation of MXene@LDHNS / CMCD

[0044] Prepared according to the method and conditions of step (c) in Example 1

[0045] (c) Preparation of MXene@LDHNS / CMCD composite modified GCE

[0046] Grind and polish the base electrode into a mirror surface, then ultrasonically clean it with ultrapure water, and dry it naturally at room temperature to obtain the processed GCE; ultrasonically disperse the MXene@LDHNS / CMCD composite material prepared in step (c) in deionized water, and prepare the concentration 1 mg / mL dispersion liquid, take 2 μL of the dispersion liquid and drop-coat it on the surface of the GCE treated in step (d), and let it dry naturally at room temperature to obtain the MXene@LDHNS / CMCD composite membrane...

Embodiment 3

[0048] (a) Preparation of MXene materials

[0049] Prepared according to the method and conditions of step (a) in Example 1;

[0050] (b) Preparation of MXene@LDHNS

[0051] Prepared according to the method and conditions of step (b) in Example 1;

[0052] (c) Preparation of MXene@LDHNS / CMCD

[0053] Prepared according to the method and conditions of step (c) in Example 1

[0054] (c) Preparation of MXene@LDHNS / CMCD composite modified GCE

[0055] Grind and polish the base electrode into a mirror surface, then ultrasonically clean it with ultrapure water, and dry it naturally at room temperature to obtain the processed GCE; ultrasonically disperse the MXene@LDHNS / CMCD composite material prepared in step (c) in deionized water, and prepare the concentration 1 mg / mL dispersion liquid, take 8 μL of the dispersion liquid and drop-coat it on the surface of the GCE treated in step (d), and let it dry naturally at room temperature to obtain the MXene@LDHNS / CMCD composite membrane...

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Abstract

The invention discloses a transition metal carbonitride@cobalt-aluminum hydrotalcite nanosheet / carboxymethyl-beta-cyclodextrin composite membrane modified electrode, and a preparation method thereof and application of the modified electrode in identification and detection of a methionine enantiomer. The preparation method comprises the steps: firstly, preparing MXene by utilizing a fluorate etching method, and growing hydrotalcite-like nanosheets on the surface of the MXene in situ; and modifying carboxymethyl-beta-cyclodextrin to the surface of MXene@LDHNS by utilizing an electrostatic adsorption effect to prepare an MXene@LDHNS / CMCD nano composite material, and preparing a corresponding composite membrane modified electrode by adopting a dispensing method. The modified electrode plays a synergistic role of MXene, hydrotalcite-like nanosheets and carboxymethyl-beta-cyclodextrin, identification and high-sensitivity detection of the methionine enantiomer are realized, the linear range of L-methionine detection is 2*10<-8>-2.5*10<-5> mol / L, and the detection limit is 9.6 nmol / L; and the linear range of D-methionine detection is 1*10<-7>-2.5*10<-5> mol / L, and the detection limit is 39 nmol / L. The preparation method of the modified electrode is simple, and high-sensitivity identification and detection of the methionine chiral enantiomer can be realized.

Description

Technical field: [0001] The invention relates to a MXene@cobalt-aluminum hydrotalcite nanosheet / carboxymethyl-β-cyclodextrin modified electrode; the invention also relates to the preparation method of the modified electrode and its electrochemical identification application to amino acid enantiomers . Background technique: [0002] Chiral molecules, also known as enantiomers, have the same elemental composition and main physical and chemical properties, but there are great differences in metabolic process, physiological toxicity and pharmacological activity. Often, only one chiral molecule is effective, while the other is ineffective, or even exhibits the opposite effect. Methionine is an essential amino acid for animals. It can maintain the growth and development of the body and nitrogen balance, prevent liver diseases and poisoning such as arsenic and benzene. The lack of methionine in livestock and poultry will cause stunting, weight loss, weakening of liver and kidney f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327G01N27/49
CPCG01N27/3277G01N27/3278G01N27/49
Inventor 詹天荣王军王闰夏钱星王超王磊
Owner QINGDAO UNIV OF SCI & TECH
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