Preparation method and application of acidic hydrogel for detecting alcohol organic matters
By preparing acidic hydrogels, the problem of cumbersome detection of alcohol compounds in existing technologies has been solved, achieving rapid, simple, visual, and environmentally friendly detection results.
Patent Information
- Application Number
- CN202411089316.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2026-02-10
AI Technical Summary
Existing methods for detecting alcohol compounds are cumbersome and require large instruments, making it difficult to meet the needs for rapid, simple, and visual detection.
An acidic hydrogel was prepared by mixing acrylamide, a crosslinking agent, an initiator, and a strong acid solution, adding an indicator solution, reacting, soaking, and drying. The resulting hydrogel was used for the rapid detection of alcohol compounds.
It enables rapid, simple, and visual detection of alcohol compounds, and is environmentally friendly, with good repeatability and high sensitivity.
Smart Images
Figure CN121495040A_ABST
Abstract
Description
Technical Field
[0001] This application relates to a method for preparing an acidic hydrogel for detecting alcohols and its application, belonging to the field of rapid detection of alcohols. Background Technology
[0002] Alcohols are a class of organic compounds containing one or more hydroxyl (-OH) groups in their molecules. They have wide applications in industry and daily life, but also pose certain hazards. Alcohols can cause poisoning through inhalation, skin contact, or ingestion, leading to symptoms such as headaches, dizziness, pulmonary edema, and arrhythmias. Furthermore, the emission of some alcohols can pollute the environment, affecting air quality and ecological balance. Therefore, strict management and control of alcohols are necessary during industrial production and use to reduce their potential harm to human health and the environment.
[0003] The most common method for detecting alcohols is gas chromatography, which has established testing standards. For example, the standard GBZ / T160.48-2007 issued by the Chinese Center for Disease Control and Prevention details the determination method for alcohol compounds in workplace air. However, this testing process is relatively cumbersome, requires large instruments, and has a long testing cycle, failing to meet the need for rapid on-site results. Therefore, there is a need to develop a simple, rapid, and visual method for the detection of alcohol compounds. Chemical colorimetric sensors have received widespread attention in the field of rapid compound detection in recent years. Combining the stability of hydrogels and their ability to provide an aqueous environment for reactions, indicators that react with alcohol compounds are immobilized within them, resulting in hydrogel-type sensors suitable for the rapid detection of alcohol compounds. Summary of the Invention
[0004] The purpose of this invention is to provide an application of an acidic hydrogel in the rapid detection of alcohol compounds. This hydrogel has good stability, high sensitivity, can be used without the need for a large amount of reagents, is environmentally friendly, and has a wide range of applications.
[0005] According to one aspect of this application, a method for preparing an acidic hydrogel for detecting alcoholic organic compounds is provided, the method comprising at least the following steps:
[0006] Step 1: Mix acrylamide, crosslinking agent, initiator and strong acid solution, stir, add indicator solution, react to obtain transparent hydrogel;
[0007] Step 2: Immerse the transparent hydrogel obtained in Step 1 in deionized water and dry it to obtain an acidic hydrogel for detecting alcohol organic compounds.
[0008] The indicator in the indicator solution is methylene blue.
[0009] Optionally, the strong acid in the strong acid solution is selected from at least one of sulfuric acid and p-toluenesulfonic acid.
[0010] Optionally, the concentration of the acrylamide in the strong acid solution is 2-5 g / L.
[0011] Optionally, the concentration of acrylamide in the strong acid solution can be independently selected from any value among 2.0 g / L, 2.5 g / L, 3.0 g / L, 3.5 g / L, 4.0 g / L, 4.5 g / L, and 5.0 g / L, or a range between any two of the above points.
[0012] Optionally, the crosslinking agent is divinylbenzene.
[0013] Optionally, the concentration of the crosslinking agent in the strong acid solution is 0.1 to 0.3 g / L.
[0014] Optionally, the concentration of the crosslinking agent in the strong acid solution can be independently selected from any value among 0.10 g / L, 0.15 g / L, 0.20 g / L, 0.25 g / L, 0.30 g / L, or a range between any two of the above points.
[0015] Optionally, the initiator is selected from at least one of cerium ammonium nitrate, potassium persulfate, and hydrogen peroxide.
[0016] Optionally, the concentration of the initiator in the strong acid solution is 0.01 to 0.05 g / L.
[0017] Optionally, the concentration of the initiator in the strong acid solution can be independently selected from any value among 0.01 g / L, 0.02 g / L, 0.03 g / L, 0.04 g / L, 0.05 g / L, or a range between any two of the above points.
[0018] Optionally, the concentration of the indicator solution is 0.3 to 0.5 g / L.
[0019] Optionally, the concentration of the indicator solution may be independently selected from any value among 0.30 g / L, 0.35 g / L, 0.40 g / L, 0.45 g / L, 0.50 g / L, or a range between any two of the above points.
[0020] Optionally, the stirring time is 5 to 8 hours.
[0021] Optionally, the volume ratio of indicator solution to strong acid is (2-6):(1-2).
[0022] Alternatively, the reaction conditions in step one are as follows:
[0023] The reaction was carried out under ultraviolet light irradiation;
[0024] The reaction time is 20 to 30 hours;
[0025] The reaction temperature is 50–80°C.
[0026] Optionally, the drying time in step two is 8 to 12 hours;
[0027] The drying temperature is 30-35℃.
[0028] According to another aspect of this application, an application of an acidic hydrogel for detecting alcohols is provided, wherein the alcohols are reacted with the acidic hydrogel for detecting alcohols.
[0029] Optionally, the alcoholic organic compound is selected from at least one of butanol, pentanol, furfuryl alcohol, and ethylhexanol.
[0030] Optionally, the conditions for the contact reaction are as follows:
[0031] The contact reaction temperature is 40–70℃;
[0032] The contact reaction time is 10 to 20 minutes.
[0033] The beneficial effects that this application can produce include:
[0034] 1) The constructed acidic hydrogel for the detection of alcohols has high stability and good repeatability because it is rich in water molecules, which can provide an aqueous environment for the indicator used in the detection of alcohols.
[0035] 2) The constructed acidic hydrogel for the detection of alcohol compounds does not require the use of a large amount of reaction reagents, making it environmentally friendly.
[0036] 3) By heating the analyte, its volatile gases react with the hydrogel for 10 minutes to obtain obvious color change results. The detection sensitivity is high and the operation is simple. Attached Figure Description
[0037] Figure 1 The colorimetric effect of the acidic hydrogel prepared in Example 1 of this application on the volatilization of butanol and pentanol at 40°C was measured.
[0038] Figure 2 The colorimetric effect of the acidic hydrogel prepared in Example 1 of this application on the volatilization of furfuryl alcohol at 70°C was tested. Detailed Implementation
[0039] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.
[0040] Unless otherwise specified, the raw materials used in the embodiments of this application were purchased commercially.
[0041] Example 1
[0042] The preparation method of acidic hydrogels is as follows:
[0043] 0.02 g acrylamide, 0.002 g divinylbenzene crosslinking agent, and 0.0001 g cerium ammonium nitrate initiator were added to 10 mL of 3% sulfuric acid aqueous solution at concentrations of 2 g / L, 0.2 g / L, and 0.01 g / L, respectively. After mixing thoroughly, the solution was stirred for 8 hours. Then, 0.005 g of methylene blue indicator was added to bring the concentration to 0.5 g / L. The solution was reacted at 50 °C under ultraviolet irradiation for 25 hours. After the reaction was completed, the product was immersed in deionized water to remove unreacted monomers and initiators. The product was then dried in an oven at 35 °C for 8 hours to constant weight to obtain an acidic hydrogel that can be used to test alcohol compound gases.
[0044] Example 2
[0045] The preparation method of acidic hydrogels is as follows:
[0046] 0.05 g acrylamide, 0.001 g divinylbenzene crosslinking agent, and 0.0005 g cerium ammonium nitrate initiator were added to 10 mL of 5% sulfuric acid aqueous solution at concentrations of 5 g / L, 0.1 g / L, and 0.05 g / L, respectively. After mixing thoroughly, the solution was stirred for 5 hours. Then, 0.004 g of methylene blue indicator was added to bring the concentration to 0.4 g / L. The solution was reacted at 80 °C under ultraviolet light irradiation for 20 hours. After the reaction was completed, the product was immersed in deionized water to remove unreacted monomers and initiators. The product was then dried in an oven at 35 °C for 12 hours until constant weight was obtained, yielding an acidic hydrogel capable of testing alcohol compound gases.
[0047] Example 3
[0048] The preparation method of acidic hydrogels is as follows:
[0049] 0.05 g acrylamide, 0.001 g divinylbenzene crosslinking agent, and 0.0005 g cerium ammonium nitrate initiator were added to 10 mL of 4% sulfuric acid aqueous solution at concentrations of 5 g / L, 0.1 g / L, and 0.05 g / L, respectively. After mixing thoroughly, the solution was stirred for 7 hours. Then, 0.003 g of methylene blue indicator was added to bring the concentration to 0.3 g / L. The solution was reacted at 60 °C under ultraviolet irradiation for 30 hours. After the reaction was completed, the product was immersed in deionized water to remove unreacted monomers and initiators. The product was then dried in an oven at 35 °C for 10 hours until constant weight was obtained, yielding an acidic hydrogel capable of testing alcohol compound gases.
[0050] Example 4
[0051] The acidic hydrogel prepared in Example 1 was reacted with n-butanol (10 ppm) and pentanol gas (10 ppm) at 40 degrees Celsius for 10 minutes. The color change of the acidic hydrogel was then observed. Figure 1 As shown.
[0052] Example 5
[0053] The acidic hydrogel prepared in Example 1 was reacted with furfuryl alcohol gas (5 ppm) at 70 degrees Celsius for 10 minutes. The color change of the acidic hydrogel was then observed. Figure 2 As shown.
[0054] Comparative Example 1
[0055] The acidic hydrogel prepared in Example 1 was not in contact with any alcoholic organic compounds. The color development of the hydrogel is shown in [reference needed]. Figure 1 , Figure 2 The control group in the study.
[0056] Comparative Example 2
[0057] When a methylene blue indicator solution (concentration of 4 g / L) was spotted onto porous filter paper and reacted with ester compounds for 10 minutes, the indicator did not change color.
[0058] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.
Claims
1. A method for preparing an acidic hydrogel for detecting alcohols and other organic compounds, characterized in that, The preparation method includes at least the following steps: Step 1: Mix acrylamide, crosslinking agent, initiator and strong acid solution, stir, add indicator solution, react to obtain transparent hydrogel; Step 2: Immerse the transparent hydrogel obtained in Step 1 in water and dry it to obtain an acidic hydrogel for detecting alcohol organic compounds. The indicator in the indicator solution is methylene blue.
2. The preparation method according to claim 1, characterized in that, The strong acid in the strong acid solution is selected from at least one of sulfuric acid and p-toluenesulfonic acid; The concentration of acrylamide in the strong acid solution is 2–5 g / L.
3. The preparation method according to claim 1, characterized in that, The crosslinking agent is divinylbenzene; Preferably, the concentration of the crosslinking agent in the strong acid solution is 0.1 to 0.3 g / L.
4. The preparation method according to claim 1, characterized in that, The initiator is selected from at least one of cerium ammonium nitrate, potassium persulfate, and hydrogen peroxide; Preferably, the concentration of the initiator in the strong acid solution is 0.01 to 0.05 g / L.
5. The preparation method according to claim 1, characterized in that, The concentration of the indicator in the indicator solution is 0.3–0.5 g / L; Preferably, the stirring time is 5 to 8 hours; Preferably, the volume ratio of indicator solution to strong acid is (2-6):(1-2).
6. The preparation method according to claim 1, characterized in that, The conditions for the reaction in step one are as follows: The reaction was carried out under ultraviolet light irradiation; The reaction time is 20 to 30 hours; The reaction temperature is 50–80°C.
7. The preparation method according to claim 1, characterized in that, The drying time for step two is 8 to 12 hours; The drying temperature is 30-35℃.
8. An application of an acidic hydrogel for detecting alcohols, characterized in that, The alcohols are reacted with an acidic hydrogel used to detect the alcohols. The acidic hydrogel for detecting alcohols is prepared by the preparation method according to any one of claims 1 to 7.
9. The application according to claim 8, characterized in that, The alcohols are selected from at least one of butanol, pentanol, furfuryl alcohol, and ethylhexanol.
10. The application according to claim 8, characterized in that, The conditions for the contact reaction are as follows: The contact reaction temperature is 40–70℃; The contact reaction time is 10 to 20 minutes.