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Construction method of portable potentiometric photoelectrochemical sensor for quickly detecting chemical oxygen demand

A chemical oxygen demand and construction method technology, which is applied in the field of rapid detection of chemical oxygen demand portable potentiometric photoelectrochemical sensors, can solve the problems of highly corrosive sulfuric acid, environmental secondary pollution, poisonous and harmful, etc., and achieve improved degradation Efficiency, cost reduction, and portability

Active Publication Date: 2021-04-30
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional COD detection method is reasonable and has a wide range of applications, it still has many problems, such as the relatively high cost of silver sulfate (Ag2SO4 ), highly corrosive sulfuric acid and toxic and harmful potassium dichromate and mercury sulfate reagents
As a result, after the water sample is tested, the reagents used may cause secondary pollution to the environment, and the traditional detection method still has the problem of too long detection time

Method used

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  • Construction method of portable potentiometric photoelectrochemical sensor for quickly detecting chemical oxygen demand
  • Construction method of portable potentiometric photoelectrochemical sensor for quickly detecting chemical oxygen demand
  • Construction method of portable potentiometric photoelectrochemical sensor for quickly detecting chemical oxygen demand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Synthesis of TiO 2 / CuS nanosheets

[0045] Weigh 0.4g of purchased P25 TiO 2 The powder was added into a mixed solvent of 10mL of water and 30mL of ethylene glycol, and ultrasonically treated for 30min to form a uniform dispersion. Then add 2mmol CuCl to the above solvent 2 2H 2 O and 2 mmol Na 2 S 2 o 3 ·5H 2 O, the solution is stirred until the color of the solution turns yellow-green, the yellow-green solution is poured into a 100m L round bottom flask, the temperature of the oil bath is heated to 70°C, and the round bottom flask is placed in the oil bath , Stirring and heating continuously for 4h. Finally, the flask was taken out from the oil bath, cooled naturally at room temperature, the resulting solution was centrifuged at 7000 rad / s for 10 min, washed with ethanol and water three times, and dried at 60°C for 4 h.

[0046] figure 2 It is the TiO obtained in Example 1 2 SEM and TEM images of / CuS, nano-TiO can be seen 2 Attached to the surface o...

Embodiment 2

[0060] (1) Synthesis of TiO 2 / CuS nanosheets

[0061] Weigh 0.3g of purchased P25 TiO 2 The powder was added into a mixed solvent of 10mL of water and 30mL of ethylene glycol, and ultrasonically treated for 30min to form a uniform dispersion. Then add 2mmol CuCl to the above solvent 2 2H 2 O and 2 mmol Na 2 S 2 o 3 ·5H 2 O, the solution is stirred until the color of the solution turns yellow-green, the yellow-green solution is poured into a 100m L round bottom flask, the temperature of the oil bath is heated to 70°C, and the round bottom flask is placed in the oil bath , Stirring and heating continuously for 4h. Finally, the flask was taken out from the oil bath, cooled naturally at room temperature, the resulting solution was centrifuged at 7000 rad / s for 10 min, washed with ethanol and water three times, and dried at 60°C for 4 h.

[0062] Step (2), (3) and (4) are the same as step (2), (3) and (4) of embodiment 1.

Embodiment 3

[0064] (1) Synthesis of TiO 2 / CuS nanosheets

[0065] Weigh 0.5g of purchased P25 TiO 2 The powder was added into a mixed solvent of 10mL of water and 30mL of ethylene glycol, and ultrasonically treated for 30min to form a uniform dispersion. Then add 2mmol CuCl to the above solvent 2 2H 2 O and 2 mmol Na 2 S 2 o 3 ·5H 2 O, the solution is stirred until the color of the solution turns yellow-green, the yellow-green solution is poured into a 100m L round bottom flask, the temperature of the oil bath is heated to 70°C, and the round bottom flask is placed in the oil bath , Stirring and heating continuously for 4h. Finally, the flask was taken out from the oil bath, cooled naturally at room temperature, the resulting solution was centrifuged at 7000 rad / s for 10 min, washed with ethanol and water three times, and dried at 60°C for 4 h.

[0066] Step (2), (3) and (4) are the same as step (2), (3) and (4) of embodiment 1.

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Abstract

The invention belongs to the technical field of photoelectrochemical sensors, discloses a construction method of a portable potentiometric photoelectrochemical sensor for quickly detecting chemical oxygen demand, and provides a construction method of a portable potentiometric photoelectrochemical sensor consisting of a double-electrode integrated electrode chip and a miniature voltmeter. A voltmeter is used as a direct reading strategy, and the method comprises the following steps: 1, preparing a photocatalytic material titanium dioxide composite copper sulfide TiO2 / CuS; and 2, constructing the potential type photoelectrochemical sensor for detecting the chemical oxygen demand. The novel potentiometric photoelectrochemical sensor constructed by the invention does not need an external power supply, the detection device supplies power to the detection process, and the voltmeter is used as a direct reading strategy, so that miniaturization and portability are easy, and field detection is realized. And meanwhile, the photocatalytic material is used for replacing a toxic and harmful catalyst required by traditional detection, so that the secondary influence on the environment is greatly reduced, and certain environmental friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical sensors, and provides a construction method of a portable potentiometric photoelectrochemical sensor for rapid detection of chemical oxygen demand consisting of a double-electrode integrated electrode chip and a miniature voltmeter. Background technique [0002] Water pollution not only affects the surface water environment visible to humans, but also affects soil, groundwater and even human diet. Therefore, water pollution has a great impact on human production and life. At present, there are many monitoring techniques for water quality monitoring, the most common of which is instrumental analysis, that is, laboratory analysis. This monitoring method generally involves random sampling of actual samples in the testing area, and then the samples are analyzed in the laboratory. However, this does not control the natural process of chemical substances in the process of sampling to labor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/30Y02P20/133
Inventor 郝楠戴震王媛张萌王坤
Owner JIANGSU UNIV
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