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A preparation method of an optically sensitive material for detecting the concentration of sulfur dioxide

A sensitive material, sulfur dioxide technology, applied in the field of preparation of optically sensitive materials, can solve the problems of insensitivity, cumbersome operation, and long time consumption, and achieve the effects of simple structure, increased specific surface area, and reduced energy consumption

Active Publication Date: 2019-03-15
ZHEJIANG TONGXING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to provide an optically sensitive material with high sensitivity, fast response rate and good stability for the detection of sulfur dioxide concentration in view of the existing sulfur dioxide detection methods that are time-consuming, cumbersome, and insensitive. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing an optically sensitive material for detecting the concentration of sulfur dioxide, characterized in that the following steps are adopted:

[0035] 1) Fix the P-type silicon chip in the electrolytic cell as the anode, and use the platinum electrode as the cathode, add the solution formed by hydrofluoric acid / ethanol / glycerol with a volume ratio of 4:1:0.005 as the electrolyte, and pass Enter direct current, carry out anodic oxidation, used electric current is 20mA, reaction time is 3min, after reaction is finished, silicon chip is rinsed with ethanol, and nitrogen gas is blown dry, obtains the silicon chip of porous structure;

[0036] 2) oxidizing the silicon wafer with the above porous structure at 600° C. for 3 hours for activation to obtain a stable active porous silicon carrier;

[0037] 3) prepare 0.1% bromothymol blue ethanol solution (that is, the mass percentage of bromothymol blue in bromothymol blue ethanol solution is 0.1%), then use 0....

Embodiment 2

[0040] A method for preparing an optically sensitive material for detecting the concentration of sulfur dioxide, using the following steps:

[0041] 1) Fix the titanium sheet in the electrolytic cell as the anode, and use the platinum electrode as the cathode, add NH with a mass ratio of 3:2:97 4 The solution formed by F / deionized water / ethylene glycol is connected to direct current for anodic oxidation, the voltage used is 40V, and the reaction time is 60min. After the reaction is completed, the titanium sheet is rinsed with ethanol and dried with nitrogen to obtain a porous structure. titanium sheet;

[0042] 2) Activate the porous titanium sheet by oxidizing it for 2 hours at 500°C to obtain a stable active porous titanium sheet carrier;

[0043] 3) prepare 1% bromocresol green ethanol solution (the mass percent of bromocresol green in the bromocresol green ethanol solution is 1%), then use 0.08g / L aqueous sodium hydroxide solution and 2% hydrochloric acid The aqueous sol...

Embodiment 3

[0046] A method for preparing an optically sensitive material for detecting the concentration of sulfur dioxide, using the following steps:

[0047] 1) Fix the titanium sheet in the electrolytic cell as the anode, and use the platinum electrode as the cathode, add NH with a mass ratio of 3:2:97 4 The solution formed by F / deionized water / ethylene glycol is connected to direct current for anodic oxidation, the voltage used is 60V, and the reaction time is 120min. After the reaction is completed, the titanium sheet is rinsed with ethanol and dried with nitrogen to obtain a porous structure. titanium sheet.

[0048] 2) Activate the titanium sheet with the above porous structure by oxidation at 450° C. for 2 hours to obtain a stable active porous titanium sheet carrier.

[0049] 3) prepare 1.5% dimethyl yellow ethanol solution (the mass percentage of dimethyl yellow in the dimethyl yellow ethanol solution is 1.5%), then adjust with 0.08g / L sodium hydroxide aqueous solution and 2% ...

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Abstract

The invention discloses a preparation method of a photo-sensitive material for detecting sulfur dioxide concentration. The preparation method includes the following steps that 1, a carrier material serves as an anode, a platinum sheet serves as a cathode, an electrolyte is added, constant-current or constant-voltage direct current electro-chemical anode oxidation is conducted, the carrier material obtained after anode oxidation is flushed and dried and then placed in a muffle furnace, oxidation is conducted for 1-3 hours at the temperature of 400-600 DEG C, and an active porous carrier is prepared; 2, photo-sensitive dye is prepared into a dye ethanol solution with the mass fraction of 0.1-2%, the pH of the solution is adjusted, then the solution is loaded on the surface of the active porous carrier, and the photo-sensitive material for detecting sulfur dioxide concentration is obtained after drying. The obtained photo-sensitive material for detecting sulfur dioxide concentration is high in sensitivity, high in response speed and good in stability, and the problems that an existing sulfur dioxide detection method is long in time, complex in operation, insensitive in reaction and the like are solved.

Description

technical field [0001] The invention relates to the technical field of sulfur dioxide gas detection materials, in particular to a preparation method of an optically sensitive material for detecting the concentration of sulfur dioxide. Background technique [0002] Sulfur dioxide is a pungent and suffocating colorless gas, one of the main pollutants in the atmosphere. A small amount of sulfur dioxide is harmless to the human body, but excessive intake is highly toxic to the human body, easily causing respiratory diseases, and also harmful to the liver, kidney and heart. In recent years, with the continuous development of industry, the concentration of sulfur dioxide in the air has risen to a high level, seriously affecting human health. Therefore, it is very necessary to detect and control the content of sulfur dioxide in the air. [0003] At present, the detection methods for sulfur dioxide mainly include formaldehyde buffer solution absorption method, constant potential e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84C25D11/02
CPCC25D11/02G01N21/84
Inventor 李世雄盛伟民
Owner ZHEJIANG TONGXING TECH CO LTD
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