A photoelectrochemical detection method for sulfur dioxide

A photoelectrochemical and sulfur dioxide technology, applied in the field of analysis and testing, can solve the problems of electrochemical sensor devices such as changes in the morphology and stability of metal oxides, sensors that cannot withstand high temperatures, instability and easy degradation, etc., to promote effective separation and low cost , The effect of improving the sensitivity

Active Publication Date: 2019-05-14
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sensor still has the defect that it cannot withstand high temperature, and the morphology and stability of the metal oxide on the surface of the electrochemical sensor will also change under high temperature detection conditions.
For those sensors that use conductive polymers as sensing elements, they have the advantages of being easy to prepare and operate at room temperature, but they also have the disadvantages of instability and easy degradation.

Method used

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  • A photoelectrochemical detection method for sulfur dioxide
  • A photoelectrochemical detection method for sulfur dioxide
  • A photoelectrochemical detection method for sulfur dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: a kind of photoelectrochemical detection method of sulfur dioxide, comprises the steps:

[0051] (1) Synthesis of SiO 2 Microspheres: Add 3.2 ml of 99% tetraethyl orthosilicate to 105 ml of absolute ethanol, 8.5 ml of water and 2.68 ml of 26% ammonia, and stir magnetically at room temperature for 4 hours, then use anhydrous Ethanol was centrifuged and washed three times and stored in 20 ml of absolute ethanol;

[0052] (2) Preparation of SiO 2 @TiO 2 Core-shell microspheres: the prepared 4 ml SiO 2 Disperse the microspheres in a mixed solution consisting of 50 mg of 10 ml of absolute ethanol, 8 ml of acetonitrile and 0.1 ml of 26% ammonia water and stir for 8 minutes; then add tetrabutyl titanate that has been dispersed with 4 ml of absolute ethanol ester, and stirred for 1.5 hours, and then were dispersed in 15 ml of water after washing with ethanol and water respectively twice;

[0053] (3) Preparation of hollow spherical nano-TiO 2 : 15 ml of SiO ...

Embodiment 2

[0058] Embodiment 2: a kind of photoelectrochemical detection method of sulfur dioxide, comprises the steps:

[0059] (1) Synthesis of SiO 2 Microspheres: Add 4.2 ml of 99% tetraethyl orthosilicate to 115 ml of absolute ethanol, 9.5 ml of water and 3.68 ml of 26% ammonia, stir magnetically at room temperature for 5 hours, then use anhydrous Ethanol was centrifuged and washed three times and stored in 30 ml of absolute ethanol;

[0060] (2) Preparation of SiO 2 @TiO 2 Core-shell microspheres: 5 ml of prepared SiO 2 Disperse the microspheres in a mixed solution consisting of 60 mg of 15 ml of absolute ethanol, 10 ml of acetonitrile and 0.2 ml of 26% ammonia water and stir for 10 minutes; then add tetrabutyl titanate that has been dispersed with 5 ml of absolute ethanol ester, and stirred for 2 hours, and then were dispersed in 20 ml of water after washing with ethanol and water respectively for 3 times;

[0061] (3) Preparation of hollow spherical nano-TiO 2 : 20 ml of SiO...

Embodiment 3

[0066] Embodiment 3: a kind of photoelectrochemical detection method of sulfur dioxide, comprises the steps:

[0067] (1) Synthesis of SiO 2 Microspheres: Add 5.2 ml of 99% tetraethylorthosilicate to 135 ml of absolute ethanol, 10.5 ml of water and 4.68 ml of 26% ammonia, stir magnetically at room temperature for 6 hours, then use anhydrous Ethanol was centrifuged and washed three times and stored in 40 ml of absolute ethanol;

[0068] (2) Preparation of SiO 2 @TiO 2 Core-shell microspheres: Prepare 6 ml of SiO 2 Disperse the microspheres in a mixed solution consisting of 70 mg of 20 ml of absolute ethanol, 15 ml of acetonitrile and 0.3 ml of 26% ammonia water and stir for 15 minutes; then add tetrabutyl titanate that has been dispersed with 6 ml of absolute ethanol ester, and stirred for 3 hours, and then were dispersed in 30 ml of water after washing with ethanol and water for 3 times;

[0069] (3) Preparation of hollow spherical nano-TiO 2 : 30 ml of SiO 2 @TiO 2 Th...

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Abstract

The invention discloses a photoelectrochemical detection method of sulfur dioxide. The photoelectrochemical detection method comprises the following steps of cleanly washing a sliced ITO (Indium Tin Oxide) electrode by using alkaline liquid; preparing Ba<2+> doped TiO2 nano hollow sphere suspension liquid, then thinning the Ba<2+> doped TiO2 nano hollow sphere suspension liquid for 20 to 40 times, taking and dropwise applying 15 to 30 microliters of the thinned suspension liquid to one end of the ITO electrode, and drying the ITO electrode at a room temperature; moistening and rinsing the electrode by using water, so as to obtain a Ba<2+> doped TiO2 nano hollow sphere modified ITO electrode; making the prepared ITO electrode act with sulfate ions of different concentration values; establishing a quantitative linear equation according to the quantitative influences of the concentrations of the sulfate ions on a photoelectric current of the ITO electrode, wherein the quantitative linear equation is used for measuring the sulfur dioxide. The detection method provided by the invention has advantages of being simple, easy to operate, low in cost, high in sensitivity and good in selectivity and is operated at a room temperature, and the like.

Description

technical field [0001] The invention belongs to the field of analysis and testing, and in particular relates to a method for detecting sulfur dioxide. Background technique [0002] Sulfur dioxide (chemical formula SO 2 ) is the most common and simplest sulfur oxide and one of the main pollutants in the atmosphere. The gas is emitted during volcanic eruptions and is also produced in many industrial processes because coal and oil often contain sulfur, which is produced when burned. When sulfur dioxide dissolves in water, sulfurous acid is formed. Sulfurous acid is further oxidized in the presence of PM2.5 to quickly and efficiently generate sulfuric acid (the main component of acid rain). This is one of the main concerns about the environmental effects of using these fuels as energy sources. [0003] The destruction of atmospheric environmental resources is an irreversible process, and the restoration of good air quality is several times more expensive than the prevention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 李红波李静谢文玉方海林王伟鞠熊华
Owner YANCHENG INST OF TECH
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