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A kind of preparation method and application of hydrogen sulfide photoelectrochemical sensor

A photoelectrochemical and hydrogen sulfide technology, applied in the field of analytical chemistry, can solve the problems of sensor stability and reproducibility attenuation, long preparatory work, cumbersome steps, etc., and achieve large band gap, high sensitivity and high selectivity quantification Effects of detection and simplification of assembly

Active Publication Date: 2021-06-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional photoelectrochemical sensors need to use a variety of photoelectric materials to modify the photoelectrode to enhance the photoelectric performance, but these modification steps are cumbersome and require complex and lengthy preliminary preparations, resulting in attenuation of the stability and reproducibility of the sensor

Method used

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  • A kind of preparation method and application of hydrogen sulfide photoelectrochemical sensor
  • A kind of preparation method and application of hydrogen sulfide photoelectrochemical sensor
  • A kind of preparation method and application of hydrogen sulfide photoelectrochemical sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation of highly sensitive and selective hydrogen sulfide photoelectrochemical sensor, it comprises the steps:

[0036] (1) Weigh an appropriate amount of anhydrous sodium sulfate and prepare it into an aqueous solution of the required concentration.

[0037] (2) Use BR buffer to adjust the pH of the sodium sulfate aqueous solution within the range of pH 2.0-10.0 as needed.

[0038] (3) Take several milliliters of the mixed solution whose pH has been adjusted in (2), and put it in a fully transparent quartz reaction cell.

[0039] (4) The gallium nitride wafer epitaxially grown on the alumina substrate was cut into 5×15 mm wafers, and used as the working electrode, the platinum wire electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode. Submerge the three-electrode system in the above-mentioned quartz reaction cell filled with the solution.

[0040] (5) Place the reaction system with the electrodes connected in (4) in a dark...

Embodiment 2

[0046] The detection method of hydrogen sulfide concentration in the sample to be tested, it may further comprise the steps:

[0047](1) The gallium nitride wafer epitaxially grown on the alumina substrate was cut into 5×15 mm wafers, and used as the working electrode, the platinum wire electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode. The three-electrode system was submerged in a quartz reaction cell filled with 0.01 M sodium sulfate aqueous solution.

[0048] (2) Use BR buffer to adjust the solution system in (1) to pH=8.0.

[0049] (3) Add sulfonated iron phthalocyanine (trivalent) with a final concentration of 10 μM and cetyltrimethylammonium bromide dispersant with a final concentration of 10 mM into the reaction cell system filled with the mixed solution.

[0050] (4) Under dark conditions, the system in (2) was irradiated with an iodine-gallium lamp with a wavelength of 365 nm and 440 nm as the only light source, and the photocur...

Embodiment 3

[0054] Specific detection

[0055] In order to test the specificity of the method of the present invention for the detection of hydrogen sulfide, the hydrogen sulfide used in the present invention is replaced by other interfering substances, namely ascorbic acid (AA), glutathione (GSH), bicarbonate ion (CO 3 2- ), cysteine ​​(L-Cys), calcium ions (Ca 2+ ), magnesium ions (Mg 2+ ), bromide ion (Br - ), chloride ion (Cl - ), nitrate ion (NO 3 - ), hydrogen peroxide (H 2 o 2 ), dopamine (DA). The concentration of hydrogen sulfide in the figure is 1.0×10 -6 M, the concentration of ascorbic acid and cysteine ​​was 5.0×10 -4 M, the concentration of other substances is 1.0×10 -3 M.

[0056] Such as image 3 As shown, the hydrogen sulfide photoelectrochemical sensor with high sensitivity and high selectivity described in the present invention detects an obvious photocurrent enhancement signal when hydrogen sulfide exists, but other interfering substances hardly make th...

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Abstract

The invention discloses a preparation method and application of a high-sensitivity hydrogen sulfide photoelectrochemical sensor. In the invention, a gallium nitride wafer epitaxially grown on an alumina substrate is used as a photoelectrode, an aqueous solution of sodium sulfate is used as an electrolyte, and an external The light source is used for photoelectric signal detection, and then an appropriate amount of sulfonated iron phthalocyanine and cetyltrimethylammonium bromide dispersant are introduced into the reaction system to construct a hydrogen sulfide photoelectrochemical sensor for photoelectric signal detection. The present invention uses a gallium nitride wafer grown on an aluminum oxide substrate by an epitaxial growth method as a photoelectric active material of a photoelectrochemical sensor, which has a large band gap and chemical stability, so that its photoelectric activity is sufficient as a photoelectrode, and no The secondary modification greatly simplifies the assembly of the photoelectrochemical sensor; and the sensor can realize the quantitative detection of hydrogen sulfide in the sample with high sensitivity and high selectivity.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a preparation method and application of a highly sensitive hydrogen sulfide photoelectrochemical sensor, which can be used for highly sensitive and highly selective detection of hydrogen sulfide in samples. Background technique [0002] Hydrogen sulfide is a colorless, flammable, acidic gas with an odor of rotten eggs in low concentrations. For many years, hydrogen sulfide has been considered a gas that is toxic and harmful to the environment. But in recent years, more and more studies have found that it exists widely in mammals including humans, and has very important physiological and pathological functions. It is considered to be the third gas signaling molecule after nitric oxide and carbon monoxide, and its physiological functions include assisting in anti-inflammatory effects, modulating blood pressure, and reducing metabolic rate. Altered levels of hydrogen sulfide in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/305
Inventor 林振宇王馨阳王建罗芳邱彬郭隆华
Owner FUZHOU UNIV
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