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Method for measuring electron transfer process and application thereof in organic pollutant degradation process

A technology of electron transfer and determination method, applied in the fields of measurement device, material electrochemical variable, material analysis by electromagnetic means, etc., can solve problems such as large adsorption, surface electrochemical property change, and dispute of mechanism research results.

Inactive Publication Date: 2019-09-10
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, linear sweep voltammetry also has certain limitations in studying the non-radical process of carbon activated persulfate: first, carbon materials generally have a large adsorption, and after adding persulfate and electron-donating compounds, carbon materials The electrochemical properties of the surface may change, leading to deviations from the background value and affecting the results
Secondly, the surface of carbon materials is prone to oxidation reactions at high oxidation potentials, and it is impossible to present the results of the original materials in the actual reaction process.
Finally, most electron-donating compounds tend to lose electrons to form intermediate products at lower oxidation potentials, so it is impossible to tell whether the transferred electrons are provided by the electron-donating compound itself or the intermediate product during the test.
[0004] At present, the non-free radical pathway of carbon activated persulfate is gradually recognized by researchers, but due to the lack of reasonable research methods, there are disputes in the research results of the mechanism

Method used

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  • Method for measuring electron transfer process and application thereof in organic pollutant degradation process
  • Method for measuring electron transfer process and application thereof in organic pollutant degradation process
  • Method for measuring electron transfer process and application thereof in organic pollutant degradation process

Examples

Experimental program
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Embodiment 1

[0036] Determination of Electron Transfer Process of Carbon Nanotubes Activated Potassium Peroxodisulfate to Phenol

[0037] (1) The carbon nanotube powder and Nafion binder were mixed and fixed on the glassy carbon electrode to make the working electrode, the platinum electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode to form a three-electrode system and the electrodes were immersed in an appropriate amount of 20mmol / L, pH 7.3 phosphate buffer;

[0038] (2) The open circuit potential of the carbon nanotube when adding potassium peroxodisulfate in the detection step (1) solution, the stable value is 0.636V;

[0039] (3) With 0.636V as the initial potential, detect the current change before and after adding phenol to the solution in step (1), and the result shows that the current change value ΔI is about 0.4 μA;

[0040] In this embodiment, the concentration of phenol is 0.1 mmol / L, the concentration of carbon n...

Embodiment 2

[0048] Determination of the electron transfer process of carbon nanotube activated potassium peroxodisulfate to 4-nitrophenol

[0049] (1) The carbon nanotube powder and Nafion binder are mixed and fixed on the glassy carbon electrode as the working electrode, the platinum electrode is the counter electrode, and the saturated calomel electrode is the reference electrode, forming a three-electrode system and immersing the electrode in an appropriate amount of 20mmol / L, pH 7.3 in phosphate buffer;

[0050] (2) The open circuit potential of the carbon nanotubes after adding potassium peroxodisulfate in the solution in the detection step (1) has a stable value of 0.636V;

[0051] (3) With 0.636V as the initial potential, the current change in the detection step (1) before and after adding 4-nitrophenol to the solution, the result shows that the change value ΔI is about 0.025 μA;

[0052] In this embodiment, the concentration of 4-nitrophenol is 0.1 mmol / L, the concentration of ca...

Embodiment 3

[0059] Determination of Electron Transfer Process of Dimethyl Terephthalate Activated by Carbon Nanotubes with Potassium Peroxodisulfate

[0060] (1) The carbon nanotube powder and Nafion binder were mixed and fixed on the glassy carbon electrode to make the working electrode, the platinum electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode to form a three-electrode system and the electrodes were immersed in an appropriate amount of 20mmol / L, pH 7.3 phosphate buffer;

[0061] (2) The open circuit potential of the carbon nanotubes after adding potassium peroxodisulfate in the solution in the detection step (1) has a stable value of 0.636V;

[0062] (3) Taking 0.636V as the initial potential, the detection step (1) shows that the current changes before and after adding dimethyl phthalate to the solution. The results show that the current has no obvious change, and ΔI is about 0.

[0063] In this embodiment, the co...

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Abstract

The invention relates to a method for measuring an electron transfer process and an application thereof in an organic pollutant degradation process, wherein the method comprises the steps of: fixing acarbon material on a glassy carbon electrode to form a three-electrode system, immersing the electrode in a buffer solution, detecting an open-circuit potential of the carbon material after persulfate is added, taking the open-circuit potential as an initial potential, recording a current increment before and after an electron-donating compound is added, and judging the electron transfer difficulty according to the current increment condition. According to the method, a non-free radical electron transfer process of carbon material activated persulfate is accurately disclosed through an open-circuit potential and timing current coupling method, and the method is applied to the organic pollutant degradation process of a carbon material activated persulfate system, a organic pollutant degradation condition is directly judged, and a new idea is provided for research and development of an organic pollutant control technology.

Description

technical field [0001] The invention relates to a method for measuring the electron transfer process, in particular to a method for measuring the electron transfer process of a carbon material activated persulfate system, and its application in the degradation process of organic pollutants. Background technique [0002] In recent years, the advanced oxidation technology of activated persulfate has attracted more and more attention. Currently, the commonly used activation methods include heat, alkali, ultraviolet light, ultrasound, electricity, transition metal and non-metal activation. In these activation methods, non-metallic carbon materials have unique advantages such as non-toxicity, acid and alkali resistance, wide range of sources, rich pore structure and adjustable surface groups, and can effectively avoid metals in the process of activating persulfate. Catalyst leaching and secondary pollutants have attracted extensive attention of researchers. At present, tradition...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/30
CPCG01N27/308G01N27/416
Inventor 张晖任伟樊晓辉谭伟华熊亮亮
Owner WUHAN UNIV
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