A method for detecting water content in alcohol based on manganese halogen hybrid luminescent material

Abstract

The application provides a method for detecting water content in alcohol based on a manganese halogen hybrid luminescent material, which comprises the following steps: constructing a paper-based sensor by using the manganese halogen hybrid luminescent material; introducing a standard mixed solution of ethanol and water into the paper-based sensor and then heating; irradiating by using an ultraviolet light source and simultaneously taking a picture by using a camera; obtaining color information of a hydrophilic sensing area in the picture by using image processing software, obtaining an average color value, and calculating an optical signal of the sensor according to the average color value; constructing a standard curve by using optical signals of the standard mixed solution of ethanol and water with different water volume fractions and water volume fractions in the standard mixed solution through the above steps; and only the optical signal of a sample solution to be detected needs to be measured, and the water content in the sample solution to be detected is obtained by substituting the optical signal into the standard curve. The method provided by the application is simple to operate, simple to prepare, low in cost, and does not need to be operated by specific professionals, and has great application prospect in the field of on-site rapid detection.

Description

Technical Field

[0001] This invention relates to the field of analytical testing, and in particular to a method for detecting water content in alcohol based on manganese halide hybrid luminescent materials. Background Technology

[0002] Alcohol with different water contents has different uses and is applied in different scenarios. Common examples include: 75% alcohol (v / v) is used for disinfection and sterilization; 95% alcohol (v / v) is used for cell dissociation and extraction of DNA with fewer impurities; 99.5% anhydrous alcohol (v / v) is used for pigment extraction; and industrial alcohol is used for combustion heating or as a cleaning agent. Therefore, determining the water content of alcohol is of great significance to people's production and daily life. Currently, methods for determining the water content of alcohol include Karl Fischer moisture analyzer monitoring, coulometric titration, alcohol meter reverse measurement (large error), and chromatographic monitoring. Generally, a Karl Fischer moisture analyzer is used. Although this method has relatively small errors, its accuracy is affected by the sampling method and the injection volume, it is easily affected by temperature and power fluctuations, and the instrument is bulky and expensive, often requiring specialized operators, thus making it unsuitable for on-site testing of actual samples.

[0003] Hybrid metal halide luminescent materials are widely used in catalysis, electrochemical sensing, energy storage, and optoelectronic devices due to their superior photoelectric properties and mild preparation methods. Hybrid metal halides are highly sensitive to water, thus showing great promise in the analysis and detection of water content. However, the most widely studied hybrid metal halide is currently hybrid lead halide, which decomposes rapidly under high temperature and high humidity conditions, with Pb being one of the decomposition products. 2+ Highly toxic, metal halide luminescent materials pose a significant threat to human health and the natural environment. Therefore, exploring novel low-toxicity, high-efficiency, and highly stable hybrid metal halide luminescent materials for application in water sensing is of great research value. Summary of the Invention

[0004] In view of the above situation, the main objective of this invention is to propose a method for detecting the water content in alcohol based on manganese halide hybrid luminescent materials, so as to solve the above-mentioned technical problems.

[0005] This invention provides a method for detecting the water content in alcohol based on a manganese halide hybrid luminescent material, the method comprising the following steps:

[0006] Step 1: Construct a paper-based sensor using manganese halide hybrid luminescent materials;

[0007] Step 2: Introduce the standard mixture of ethanol and water into the hydrophilic sensing area of ​​the paper-based sensor, and heat the paper-based sensor in an oven.

[0008] Step 3: After heating is complete, the hydrophilic sensing area of ​​the paper-based sensor is irradiated with an ultraviolet light source, and at the same time, the paper-based sensor is photographed with a camera. The color information of the hydrophilic sensing area of ​​the paper-based sensor in the image is obtained using image processing software, the average color value is obtained, and the optical signal of the sensor is calculated based on the average color value.

[0009] Step 4: Change the volume fraction of water in the standard mixture of ethanol and water, repeat steps 2 and 3, and test the optical signal of the sensor for standard mixtures with different water volume fractions.

[0010] Step 5: Plot a standard curve with the volume fraction of water on the x-axis and the optical signal on the y-axis.

[0011] Step 6: Take the test sample solution containing different amounts of water and ethanol, repeat steps 2 and 3 to obtain the optical signal, and substitute the optical signal into the standard curve to obtain the water content in the test sample solution.

[0012] Furthermore, in step 1, the method for constructing a paper-based sensor using manganese halide hybrid luminescent materials specifically includes:

[0013] A wax printer is used to print hydrophobic areas on filter paper, with unwaxed areas reserved within the hydrophobic areas as hydrophilic sensing areas.

[0014] The filter paper is placed in an oven and heated to dry.

[0015] Manganese halide hybrid material is dissolved in a polymer solution to obtain a polymer mixed solution. The polymer mixed solution is then added dropwise to the hydrophilic sensing area of ​​a paper-based sensor. After natural drying at room temperature, a paper-based sensor for detecting the water content in alcohol is obtained.

[0016] Furthermore, in step 1, the manganese halide hybrid luminescent material is specifically MnBr4(Ted-methylnaphthalene)2(C 34 H 42 Br4MnN4).

[0017] Furthermore, in step 2, the amount of the ethanol and water standard mixture introduced into the circular hydrophilic sensing area of ​​the paper-based sensor is 0.5-10 μL, the oven temperature is 40-80℃, and the heating time is 20-40 min.

[0018] Furthermore, in step 3, a 254nm ultraviolet light source is used, the distance between the camera and the sensor is 10-100cm and the angle is 90°, and the image processing software is Photoshop.

[0019] Furthermore, in step 3, the average color value and the optical signal have the following relationship:

[0020]

[0021] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0022] Furthermore, in step 1.1, the hydrophobic region is a square with a side length of 1 to 5 cm, and the hydrophilic sensing region is located in the center of the hydrophobic region. The hydrophilic sensing region is a circle with a diameter of 0.1 to 2 cm.

[0023] Furthermore, in step 1.2, during the heating and drying process of the paper in the oven, the oven temperature is 30-130℃ and the drying time is 5-30cm.

[0024] Furthermore, in step 1.3, the ratio of manganese halide hybrid material to polymer solution is 0.001-10g:0.01-100mL, and the amount of polymer mixed solution added to the hydrophilic sensing area of ​​the paper-based sensor is 1-10μL.

[0025] Furthermore, in step 1.3, the polymer solution is polyethylene acetate, the solvent used is ethanol, and the concentration of the polymer solution is 0.01-10 mg / mL.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by means of embodiments of the invention. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating a method for detecting water content in alcohol based on manganese halide hybrid luminescent materials proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the paper-based sensor structure of the present invention;

[0029] Figure 3 This is a graph showing the change of the response signal RS of the present invention with the volume fraction of water.

[0030] Figure 4 This is a standard curve of the relationship between the volume fraction of ethanol and the response signal RS (water volume fraction is 0-25%) according to the present invention.

[0031] Figure 5 C of the present invention 34 H 42 The fluorescence spectrum of Br4MnN4 varies with the volume fraction of water.

[0032] Figure 6 C of the present invention 34 H 42The standard curve of fluorescence intensity of Br4MnN4 versus ethanol volume fraction (water volume fraction 0-25%).

[0033] Figure 7 This is a graph showing the effect of the reaction time of the paper-based sensor of the present invention on its response signal in relation to an ethanol / water mixture sample;

[0034] Figure 8 This is a graph showing the effect of the reaction temperature of the paper-based sensor of the present invention on its response signal in relation to an ethanol / water mixture sample;

[0035] Figure 9 The image shows a selective test pattern of the paper-based sensor of the present invention (the inset is a photograph of the paper-based sensor under a 365nm ultraviolet lamp under the corresponding conditions);

[0036] Figure 10 The following is a stability test diagram of the paper-based sensor of the present invention (the inset is a photograph of the paper-based sensor under a 365nm ultraviolet lamp under the corresponding conditions);

[0037] In the diagram: 1. Filter paper, 2. Hydrophobic region, 3. Hydrophilic sensing region, 4. Paper-based sensor. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] These and other aspects of the embodiments of the present invention will become clear from the following description and accompanying drawings. In these descriptions and drawings, some specific embodiments of the present invention are specifically disclosed to illustrate some ways of implementing the principles of the embodiments of the present invention; however, it should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0040] Example 1

[0041] Please see Figure 1 A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, the method comprising the following steps:

[0042] Step 1: Using a wax printer, print a 1cm square hydrophobic area 2 on filter paper 1. Leave a wax-free area in the center of the hydrophobic area as a 0.5cm diameter circular hydrophilic sensing area 3.

[0043] Filter paper 1 was placed in an oven and heated and dried at 120°C for 5 minutes.

[0044] 0.1 g of manganese halide hybrid material was dissolved in 1 mL of a polymer solution with a concentration of 1 mg / mL to obtain a polymer mixed solution. The polymer mixed solution was then added dropwise to the hydrophilic sensing region 3 and allowed to dry naturally at room temperature to obtain a paper-based sensor 4 for detecting the water content in alcohol (e.g., ...). Figure 2 (As shown).

[0045] The above steps can be repeated to prepare multiple paper-based sensors 4 for detecting the water content in alcohol, and then they can be sealed and stored in nitrogen-sealed bags for later use.

[0046] Step 2: Introduce 2 μL of the standard mixture of ethanol and water into the hydrophilic sensing area 3 of the paper-based sensor 4, and heat the paper-based sensor 4 in a 30°C oven for 30 min.

[0047] Step 3: After heating, irradiate the hydrophilic sensing area 3 of the paper-based sensor 4 with a 254nm ultraviolet light source. Set the camera to a distance of 20cm and an angle of 90° with the sensor. During the irradiation process, simultaneously capture images of the paper-based sensor 4 with the camera. Use Photoshop software to obtain the color information of the hydrophilic sensing area 3 of the paper-based sensor in the image, obtain the average color value, and calculate the optical signal of the sensor based on the average color value. The average color value and the optical signal have the following relationship:

[0048]

[0049] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0050] Step 4: Repeat steps 2 and 3 with standard ethanol-water mixtures of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, and 50% water volume to test the optical signals of the sensor for standard mixtures with different water volume fractions.

[0051] Step 5: Plot a graph with the volume fraction of water (%) on the x-axis and the optical signal on the y-axis to obtain... Figure 3 The standard curve shown in the figure indicates that RS decreases as the volume fraction of water increases.

[0052] like Figure 4 As shown, within the water volume fraction range of 0-25%, the volume fraction of H2O is linearly correlated with the response signal RS. The linear equation fitted to the standard curve is y = -0.0174X + 1.5928, R... 2 =0.9901. Compare this test result with the fluorescence spectroscopy test. For example... Figure 5As shown, the fluorescence intensity decreases with increasing H2O volume fraction, exhibiting a linear relationship within the 0-25% range (as shown in Figure 6, y = -214x + 9511.8). This result is consistent with the collected data from paper-based sensor 4. The optimization of the reaction time and temperature for paper-based sensor 4 is as follows... Figure 7 and Figure 8 As shown, the optimal reaction time is 30 min and the optimal reaction temperature is 30℃.

[0053] Step 6: Take 2 μL of the test sample solution containing 8% ethanol (volume fraction of water), and repeat steps 2 and 3. The R, G, and B values ​​are 157.61, 210.46, and 180.25 respectively, and the optical signal RS is 1.459. Substituting the optical signal into the standard curve y = -0.0174X + 1.5928, the water content in the alcohol is calculated to be 7.7%, and the recovery rate is 96%. The selectivity of the sensor is investigated, and the results are... Figure 9 The results are shown. It can be observed that the response signals of paper-based sensor 4 to toluene, n-hexane, petroleum ether, acetonitrile, methanol, ethanol, ethyl acetate, heptane, and isopropanol are much lower than those to water, indicating that the sensor has good selectivity. The stability of the sensor was investigated, and the results were... Figure 10 The results are shown. It can be observed that after the paper-based sensor 4 was placed in the atmosphere for 7 days, the optical signal changed very little, indicating that it has high stability.

[0054] Example 2

[0055] A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, the method comprising the following steps:

[0056] Step 1: Using a wax printer, print a 1.5 cm square hydrophobic area 2 on filter paper 1. Leave a wax-free area in the center of the hydrophobic area as a 1 cm diameter circular hydrophilic sensing area 3.

[0057] Filter paper 1 was placed in an oven and heated and dried at 100°C for 15 minutes.

[0058] 0.15g of manganese halide hybrid material was dissolved in 1.5mL of polymer solution with a concentration of 1.2mg / mL to obtain a polymer mixed solution. The polymer mixed solution was added dropwise to the hydrophilic sensing area 3 and dried naturally at room temperature to obtain a paper-based sensor 4 for detecting the water content in alcohol.

[0059] Step 2: Introduce 2.5 μL of the standard mixture of ethanol and water into the hydrophilic sensing area 3 of the paper-based sensor 4, and heat the paper-based sensor 4 in a 30°C oven for 30 min.

[0060] Step 3: After heating, irradiate the hydrophilic sensing area 3 of the paper-based sensor 4 with a 254nm ultraviolet light source. Set the camera to a distance of 15 cm and an angle of 90° with the sensor. During the irradiation process, simultaneously capture images of the paper-based sensor 4 with the camera. Use Photoshop software to obtain the color information of the hydrophilic sensing area 3 of the paper-based sensor in the image, obtain the average color value, and calculate the optical signal of the sensor based on the average color value. The average color value and the optical signal have the following relationship:

[0061]

[0062] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0063] Step 4: Repeat steps 2 and 3 with standard ethanol-water mixtures of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, and 55% water volume to test the optical signals of the sensor for standard mixtures with different water volume fractions.

[0064] Step 5: Plot a graph with the volume fraction of water (%) on the x-axis and the optical signal on the y-axis to obtain the standard curve y = -0.0172x + 1.5761, R. 2 =0.9923.

[0065] Step 6: Take 2.5 μL of the test sample solution containing ethanol with water (volume fraction 12%), and repeat steps 2 and 3 to obtain its R, G, and B values ​​of 154.3, 209.31, and 189.51 respectively, and the optical signal RS is 1.372. Substitute the optical signal into the standard curve y = -0.0172x + 1.5761, calculate that the water content in the alcohol is 11.87%, and the recovery rate is 98.89%.

[0066] Example 3

[0067] A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, the method comprising the following steps:

[0068] Step 1: Using a wax printer, print a 1.2cm square hydrophobic area 2 on filter paper 1. Leave a wax-free area in the center of the hydrophobic area as a 1cm diameter circular hydrophilic sensing area 3.

[0069] Filter paper 1 was placed in an oven and heated and dried at 120°C for 15 minutes.

[0070] 0.20 g of manganese halide hybrid material was dissolved in 2.0 mL of polymer solution with a concentration of 1.0 mg / mL to obtain a polymer mixed solution. The polymer mixed solution was added dropwise to the hydrophilic sensing area 3 and dried naturally at room temperature to obtain a paper-based sensor 4 for detecting the water content in alcohol.

[0071] Step 2: Introduce 1.0 μL of the standard mixture of ethanol and water into the hydrophilic sensing area 3 of the paper-based sensor 4, and heat the paper-based sensor 4 in an oven at 35°C for 30 min.

[0072] Step 3: After heating, irradiate the hydrophilic sensing area 3 of the paper-based sensor 4 with a 254nm ultraviolet light source. Set the camera to a distance of 20cm and an angle of 90° with the sensor. During the irradiation process, simultaneously capture images of the paper-based sensor 4 with the camera. Use Photoshop software to obtain the color information of the hydrophilic sensing area 3 of the paper-based sensor in the image, obtain the average color value, and calculate the optical signal of the sensor based on the average color value. The average color value and the optical signal have the following relationship:

[0073]

[0074] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0075] Step 4: Repeat steps 2 and 3 with standard ethanol-water mixtures of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and 55% water volume to test the optical signals of the sensor for standard mixtures with different water volume fractions.

[0076] Step 5: Plot a graph with the volume fraction of water (%) on the x-axis and the optical signal on the y-axis to obtain the standard curve y = -0.0169x + 1.5921, R. 2 =0.9903.

[0077] Step 6: Take 1.0 μL of the test sample solution containing ethanol (volume fraction 22%) and repeat steps 2 and 3 to obtain its R, G, and B values ​​of 139.13, 191.10, and 194.19, respectively. The optical signal RS is 1.2173. Substitute the optical signal into the standard curve y = -0.0169x + 1.5921 to calculate the water content in the alcohol as 22.17%, with a recovery rate of 100.8%.

[0078] Example 4

[0079] A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, the method comprising the following steps:

[0080] Step 1: Using a wax printer, print a 5 cm square hydrophobic area 2 on filter paper 1. Leave a wax-free area in the center of the hydrophobic area as a 2 cm diameter circular hydrophilic sensing area 3.

[0081] Filter paper 1 was placed in an oven and heated and dried at 130°C for 5 minutes.

[0082] 10g of manganese halide hybrid material was dissolved in 100mL of polymer solution with a concentration of 10mg / mL to obtain polymer mixed solution. The polymer mixed solution was added dropwise to hydrophilic sensing area 3 and dried naturally at room temperature to obtain paper-based sensor 4 for detecting water content in alcohol.

[0083] Step 2: Introduce 10 μL of the standard mixture of ethanol and water into the hydrophilic sensing area 3 of the paper-based sensor 4, and heat the paper-based sensor 4 in an 80°C oven for 40 min.

[0084] Step 3: After heating, irradiate the hydrophilic sensing area 3 of the paper-based sensor 4 with a 254nm ultraviolet light source. Set the camera to a distance of 100cm and an angle of 90° with the sensor. During the irradiation process, simultaneously capture images of the paper-based sensor 4 with the camera. Use Photoshop software to obtain the color information of the hydrophilic sensing area 3 of the paper-based sensor in the image, obtain the average color value, and calculate the optical signal of the sensor based on the average color value. The average color value and the optical signal have the following relationship:

[0085]

[0086] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0087] Step 4: Repeat steps 2 and 3 with standard ethanol-water mixtures of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and 55% water volume to test the optical signals of the sensor for standard mixtures with different water volume fractions.

[0088] Step 5: Plot a graph with the volume fraction of water (%) on the x-axis and the optical signal on the y-axis to obtain the standard curve y = -0.0159x + 1.6032, R. 2 =0.9953.

[0089] Step 6: Take 10 μL of the test sample solution containing ethanol (25% by volume) and repeat steps 2 and 3 to obtain its R, G, and B values ​​of 170.16, 233.03, and 240.24, respectively. The optical signal RS is 1.2011. Substitute the optical signal into the standard curve y = -0.0159x + 1.6032 to calculate the water content in the alcohol as 25.29% and the recovery rate as 101.2%.

[0090] Example 5

[0091] A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, the method comprising the following steps:

[0092] Step 1: Using a wax printer, print a 1 cm square hydrophobic area 2 on filter paper 1. Leave an unwaxed area in the center of the hydrophobic area as a circular hydrophilic sensing area 3 with a diameter of 0.1 cm.

[0093] Filter paper 1 was placed in an oven and heated and dried at 30°C for 30 minutes.

[0094] 0.001 g of manganese halide hybrid material was dissolved in 0.01 mL of a polymer solution with a concentration of 0.01 mg / mL to obtain a polymer mixed solution. The polymer mixed solution was added dropwise to the hydrophilic sensing area 3 and dried naturally at room temperature to obtain a paper-based sensor 4 for detecting the water content in alcohol.

[0095] Step 2: Introduce 0.5 μL of the standard mixture of ethanol and water into the hydrophilic sensing area 3 of the paper-based sensor 4, and heat the paper-based sensor 4 in a 40°C oven for 20 min.

[0096] Step 3: After heating, irradiate the hydrophilic sensing area 3 of the paper-based sensor 4 with a 254nm ultraviolet light source. Set the camera to a distance of 10cm and an angle of 90° with the sensor. During the irradiation process, simultaneously capture images of the paper-based sensor 4 with the camera. Use Photoshop software to obtain the color information of the hydrophilic sensing area 3 of the paper-based sensor in the image, obtain the average color value, and calculate the optical signal of the sensor based on the average color value. The average color value and the optical signal have the following relationship:

[0097]

[0098] In this context, RS represents the optical signal, R represents the average red, G represents the average green, and B represents the average blue.

[0099] Step 4: Repeat steps 2 and 3 with standard ethanol-water mixtures of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, and 55% water volume to test the optical signals of the sensor for standard mixtures with different water volume fractions.

[0100] Step 5: Plot a graph with the volume fraction of water (%) on the x-axis and the optical signal on the y-axis to obtain the standard curve y = -0.0147x + 1.5702, R. 2 =0.9906.

[0101] Step 6: Take 0.5 μL of the test sample solution containing ethanol (8% by volume) and repeat steps 2 and 3 to obtain its R, G, and B values ​​of 152.26, 214.58, and 181.15 respectively, and the optical signal RS is 1.4525. Substitute the optical signal into the standard curve y = -0.0147x + 1.5702 to calculate the water content in the alcohol as 8.01% and the recovery rate as 100.1%.

[0102] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0103] 1. The method provided by the present invention has good specificity and selectivity for water detection;

[0104] 2. The method provided by the present invention is simple to operate, easy to prepare, low in cost, and does not require operation by specific professionals, and has great application prospects in the field of rapid on-site detection.

[0105] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for detecting water content in alcohol based on manganese halide hybrid luminescent materials, characterized in that, The method includes the following steps: Step 1: Construct a paper-based sensor using manganese halide hybrid luminescent materials; The methods for constructing paper-based sensors using manganese halide hybrid luminescent materials specifically include: A wax printer is used to print hydrophobic areas on filter paper, with unwaxed areas reserved in the hydrophobic areas as hydrophilic sensing areas; The filter paper is placed in an oven for heating and drying; the oven temperature is 30-130 ℃ and the drying time is 5-30 min. The manganese halide hybrid material was dissolved in a polymer solution of polyethylene acetate to obtain a polymer mixed solution; wherein the manganese halide hybrid material was MnBr4(Ted-methylnaphthalene)2(C 34 H 42 The ratio of manganese halide hybrid material (Br4MnN4) to polymer solution is 0.001-10 g: 0.01-100 mL; the polymer solution is polyvinyl acetate, the solvent used is ethanol, and the concentration of the polymer solution is 0.01-10 mg / mL. A polymer mixture solution was added dropwise to the hydrophilic sensing region of a paper-based sensor, and the paper-based sensor for detecting the water content in alcohol was obtained after natural drying at room temperature; wherein, the amount of polymer mixture solution added to the hydrophilic sensing region of the paper-based sensor was 1-10 μL. Step 2: Introduce the standard mixture of ethanol and water into the hydrophilic sensing area of ​​the paper-based sensor, and heat the paper-based sensor in an oven. Step 3: After heating is complete, the hydrophilic sensing area of ​​the paper-based sensor is irradiated with an ultraviolet light source, and at the same time, the paper-based sensor is photographed with a camera. The color information of the hydrophilic sensing area of ​​the paper-based sensor in the image is obtained using image processing software, the average color value is obtained, and the optical signal of the sensor is calculated based on the average color value. Step 4: Change the volume fraction of water in the standard mixture of ethanol and water, repeat steps 2 and 3, and test the optical signal of the sensor for standard mixtures with different water volume fractions. Step 5: Plot a standard curve with the volume fraction of water on the x-axis and the optical signal on the y-axis. Step 6: Take the test sample solution containing different amounts of water and ethanol, repeat steps 2 and 3 to obtain the optical signal, and substitute the optical signal into the standard curve to obtain the water content in the test sample solution.

2. The method for detecting water content in alcohol based on manganese halide hybrid luminescent materials according to claim 1, characterized in that, In step 2, the amount of the standard mixture of ethanol and water introduced into the circular hydrophilic sensing area of ​​the paper-based sensor is 0.5-10 μL, the oven temperature is 40-80°C, and the heating time is 20-40 min.

3. The method for detecting water content in alcohol based on manganese halide hybrid luminescent materials according to claim 1, characterized in that, In step 3, a 254 nm ultraviolet light source is used, the distance between the camera and the sensor is 10-100 cm and the angle is 90°, and the image processing software is Photoshop.

4. The method for detecting water content in alcohol based on manganese halide hybrid luminescent materials according to claim 1, characterized in that, In step 3, the average color value and the optical signal have the following relationship: ； in, Represented as an optical signal, Represented as average red, Represented as average green, It is represented as average blue.

5. The method for detecting water content in alcohol based on manganese halide hybrid luminescent materials according to claim 2, characterized in that, In step 1.1, the hydrophobic region is a square with a side length of 1 to 5 cm, and the hydrophilic sensing region is located in the center of the hydrophobic region. The hydrophilic sensing region is a circle with a diameter of 0.1 to 2 cm.

Images