Preparation method and application of a self-cleaning electrochemical sensor under visible light

An electrochemical and sensor technology, applied in the field of electrochemical sensor preparation, can solve problems such as unfavorable formation of a network structure, unfavorable electrochemical testing, carboxyl salt asymmetry, etc., and achieves good detection effect and efficient use of electrodes. Impact, low cost effect

Active Publication Date: 2021-10-29
HUBEI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Metal frameworks (MOFs) are porous, which can increase their specific surface area and porosity. Ti-containing MOFs have high photocatalytic activity, but often have the following disadvantages, such as Ti metal-ligand bonding or dissociation Reversible, which prevents its crystallization; most titanium sources will undergo hydrolysis after binding with organic ligands; most carboxyl salts are asymmetric, which is not conducive to the formation of network structure
Moreover, MOFs have the characteristics of poor conductivity, which is not conducive to the direct preparation of electrode materials for electrochemical testing.

Method used

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  • Preparation method and application of a self-cleaning electrochemical sensor under visible light
  • Preparation method and application of a self-cleaning electrochemical sensor under visible light
  • Preparation method and application of a self-cleaning electrochemical sensor under visible light

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A method for preparing a hydroquinone and catechol electrochemical sensor with self-cleaning ability under ultraviolet light or visible light, comprising the following steps in sequence:

[0053] (1) Mix 0.012g citric acid monohydrate, 0.55g trimesic acid and 0.8g (1.8476mmol) La(NO 3 ) 3 ·6H 2 Add O to 9mL N, N-dimethylformamide (DMF) to dissolve, slowly add 0.5mL (1.467mmol) tetra-n-butyl titanate (TBOT) under magnetic stirring, and heat at a heating rate of 10°C / min. Reaction at 150°C for 48 hours to obtain the La-Ti metal frame material, followed by solvent exchange of the La-Ti metal frame material with chloroform and methanol, and drying at 100°C to obtain the LTOF precursor material;

[0054](2) Weigh 2g of LTOF precursor material in a crucible, raise the temperature to 800°C at a heating rate of 10°C / min under the protection of nitrogen flow, and keep it warm for 300min, take it out, grind it, and name this new composite material LTOF- 800;

[0055] (3) Take...

Embodiment 2

[0061] A method for preparing a hydroquinone and catechol electrochemical sensor with self-cleaning ability under ultraviolet light or visible light, comprising the following steps in sequence:

[0062] (1) Mix 0.012g citric acid monohydrate, 0.55g trimesic acid and 0.802g (1.8477mmol) Ce(NO 3 ) 3 ·6H 2 Add O to 9mL N, N-dimethylformamide (DMF) to dissolve, slowly add 0.638mL (1.8703mmol) tetra-n-butyl titanate (TBOT) under magnetic stirring, and heat with hydrothermal heating at a rate of 10°C / min React at 150°C for 48 hours to obtain the Ce-Ti metal frame material, perform solvent exchange on the Ce-Ti metal frame material with chloroform and methanol in sequence, and dry at 100°C to obtain the CTOF precursor material;

[0063] (2) Weigh 2g of CTOF precursor material in a crucible, raise the temperature to 800°C at a heating rate of 10°C / min under the protection of nitrogen flow, and keep it warm for 300min, take it out and grind it, and name this new composite material CT...

Embodiment 3

[0070] A method for preparing a hydroquinone and catechol electrochemical sensor with self-cleaning ability under ultraviolet light or visible light, comprising the following steps in sequence:

[0071] (1) Mix 0.012g citric acid monohydrate, 0.55g trimesic acid, 0.810g (1.848mmol) Nd(NO 3 ) 3 ·6H 2 O, take 9mL of N, N-dimethylformamide (DMF) to dissolve, slowly add 0.644mL (1.888mmol) tetra-n-butyl titanate (TBOT) under magnetic stirring, and heat to React at 150°C for 48 hours to prepare the Nd-Ti metal frame material, perform solvent exchange on the Nd-Ti metal frame material with chloroform and methanol in sequence, and dry at 100°C to obtain the NTOF precursor material;

[0072] (2) Weigh 2g of NTOF precursor material in a crucible, raise the temperature to 800°C at a heating rate of 10°C / min under the protection of nitrogen flow, and keep it warm for 300min, take it out and grind it, and name this new composite material NTOF-800 ;

[0073] (3) Dissolve 10 mg of NTOF-...

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Abstract

The invention belongs to the technical field of preparation of electrochemical sensors, and specifically discloses an electrochemical sensor with self-cleaning ability, including an electrode core and a new composite material based on MTOF (M refers to doped metal elements), and the composite material is attached to on the surface of the electrode core. The preparation method of the sensor is simple, time-saving, low-cost, and environmentally friendly, especially the polymer and the residue of the detected substance attached to the surface of the electrode core after detection can be oxidized under the conditions of ultraviolet light and visible light. The regeneration and self-cleaning effect of the electrochemical sensor under visible light can be achieved. The electrochemical sensing platform regenerated under visible light not only reduces the cumbersome procedures of electrode grinding and modification, but also saves the cost of modification materials, and the descaling and regeneration of electrodes prolongs the service life of electrodes. It is used for the simultaneous detection of environmental pollutants hydroquinone and catechol, with simple operation, good selectivity, high sensitivity and low detection limit.

Description

technical field [0001] The invention relates to the technical field of preparation of electrochemical sensors, in particular to an electrochemical sensor for simultaneously measuring hydroquinone and catechol, and the electrochemical sensor has the ability to achieve self-cleaning under visible light. Background technique [0002] Electrochemical sensing technology has shown high detection ability and effect in biochemical, medical, food environment monitoring and other fields. Electrochemical analysis method has low cost, fast analysis speed, good detection performance, less sample consumption, high sensitivity, and selectivity. It has the advantages of good performance, convenient operation, and no complicated pretreatment process. It can achieve quantitative detection and analysis for biological samples, environmental monitoring and food safety. However, for electrochemical methods, the chemical reaction occurs on the surface of the electrode and the solution. During the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30G01N27/38
CPCG01N27/26G01N27/30G01N27/38
Inventor 郑寅陈泇冰鲁猷栾宋新建黄乐舒
Owner HUBEI UNIV FOR NATITIES
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