CN112033955A - Indicator capable of rapidly qualitatively comparing photocatalytic performance of material and detection method - Google Patents
Indicator capable of rapidly qualitatively comparing photocatalytic performance of material and detection method Download PDFInfo
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- CN112033955A CN112033955A CN202010868837.3A CN202010868837A CN112033955A CN 112033955 A CN112033955 A CN 112033955A CN 202010868837 A CN202010868837 A CN 202010868837A CN 112033955 A CN112033955 A CN 112033955A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/775—Indicator and selective membrane
Abstract
The invention relates to an indicator capable of rapidly qualitatively comparing photocatalytic performance of a material and a detection method. An indicator capable of rapidly qualitatively comparing photocatalytic performance of materials is formed by mixing absolute ethyl alcohol, rhodamine B and methylene blue according to a mass ratio of 9.0-9.5: 0.2-0.4: 0.3-0.6. Compared with the prior art, the invention has the following beneficial effects: the detection method can quickly and accurately carry out qualitative comparison on the photocatalytic performance of the material, has simple conditions and steps, is easy to operate, consumes less time, can greatly shorten the research and development period, and has great significance for research, development and production of photocatalytic coating materials.
Description
Technical Field
The invention relates to an indicator capable of rapidly qualitatively comparing photocatalytic performance of a material and a detection method.
Background
The application of the photocatalytic coating material in water purification and air purification is more and more extensive, the product performance requirements applied in different environments are more and more individualized, under the trend, the product grade increase and the performance updating and upgrading speed are required to be faster and faster, but the purification capability of the product, the photocatalytic activity detection time consumption and the steps are long and complicated according to the' JCT 1074-;
therefore, it is very important to design an indicator and a detection method capable of rapidly and accurately qualitatively comparing the photocatalytic performance of the material.
Disclosure of Invention
The invention aims to provide an indicator and a detection method capable of rapidly and qualitatively comparing photocatalytic performances of materials, the indicator and the detection method can rapidly and accurately qualitatively compare photocatalytic performances of materials, conditions and steps are simple, operation is easy, time consumption is low, and a research and development period can be greatly shortened.
The invention is realized by the following technical scheme:
an indicator capable of rapidly qualitatively comparing photocatalytic performance of materials is formed by mixing absolute ethyl alcohol, rhodamine B and methylene blue according to a mass ratio of 9.0-9.5: 0.2-0.4: 0.3-0.6.
A detection method capable of rapidly qualitatively comparing photocatalytic performance of materials comprises the following steps in sequence:
firstly, marking the surface of a sample to be detected to determine a region to be detected;
secondly, uniformly coating the indicator in the claim 1 on the area to be measured;
placing the sample to be tested coated with the indicator in the step two in a light-proof environment until the indicator is dried and then taking out the sample from the light-proof environment, and immediately covering a part of the area to be tested by using a shading plate;
fourthly, placing the sample to be detected after shading treatment in the third step under a fluorescent lamp for irradiating for 1 to 10 hours, and observing the fading degree of the indicator every 1 hour in the irradiation process;
fifthly, comparing the fading degrees of more than two samples to be tested which are processed by the first step to the fourth step, the higher the fading degree is, the stronger the photocatalytic activity of the samples to be tested is.
In the first step, masking materials such as masking paper or adhesive tapes are used for masking the peripheral parts outside the to-be-detected area on the surface of the to-be-detected sample, so that the to-be-detected area is marked and determined.
And step two, covering half of the area to be detected by a shading plate.
Indicator fade mechanism:
when the surface particles of the photocatalytic coating material are irradiated by photons with energy larger than the forbidden bandwidth, electrons jump from the valence band to the conduction band to generate electron-hole pairs, the electrons have reducibility, the holes have oxidability, the holes react with-OH attached to water molecules on the surface to generate OH free radicals with high oxidability, and the active OH free radicals can break and decompose N-C bonds in methylene blue molecules, so that a chromogenic group conjugated structure in rhodamine B is destroyed, opened and mineralized.
Compared with the prior art, the invention has the following beneficial effects: the detection method can quickly and accurately carry out qualitative comparison on the photocatalytic performance of the material, has simple conditions and steps, is easy to operate, consumes less time, can greatly shorten the research and development period, and has great significance for research, development and production of photocatalytic coating materials.
Description of the figures
FIG. 1 is a schematic diagram of the mechanism of photocatalytic fading
FIG. 2 methylene blue formula
FIG. 3 rhodamine B molecular formula
FIG. 4 graph showing the results of example 1
FIG. 5 analysis chart of formaldehyde-purifying ability of interior wall paint 1
FIG. 6 analysis chart of formaldehyde-purifying ability of interior wall paint 2 of example 1
FIG. 7 graph showing the results of example 2
FIG. 8 analysis chart of formaldehyde-purifying ability of interior wall paint one in example 2
FIG. 9 analysis chart of formaldehyde-purifying ability of interior wall paint 2
FIG. 10 graph showing the results of example 3
FIG. 11 analysis chart of formaldehyde-purifying ability of interior wall paint one in example 3
FIG. 12 analysis chart of formaldehyde-purifying ability of interior wall paint 2 in example 3
Detailed Description
The invention will be further elucidated with reference to the following embodiments:
example 1
An indicator capable of rapidly and qualitatively comparing the photocatalytic performance of materials, wherein the mass ratios of absolute ethyl alcohol, rhodamine B and methylene blue are shown in Table 1:
table 1 formulation of the indicator of example 1
| Serial number | Name (R) | Content% (mass fraction) |
| 1 | Anhydrous ethanol | 95 |
| 2 | |
2 |
| 3 | Methylene blue | 3 |
| Total up to | 100 |
A detection method capable of rapidly qualitatively comparing photocatalytic performance of materials comprises the following specific steps:
firstly, marking the surface of a sample to be detected to determine a region to be detected;
secondly, uniformly coating the indicator on the area to be measured;
placing the sample to be tested coated with the indicator in the step two in a light-proof environment until the indicator is dried and then taking out the sample from the light-proof environment, and immediately covering a part of the area to be tested by using a shading plate;
fourthly, placing the sample to be detected after shading treatment in the third step under a fluorescent lamp for irradiating for 1 hour, and observing the fading degree of the indicator;
fifthly, comparing the fading degrees of more than two samples to be tested which are processed by the first step to the fourth step, the higher the fading degree is, the stronger the photocatalytic activity of the samples to be tested is.
In the first step, masking materials such as masking paper or adhesive tapes are used for masking the peripheral parts outside the to-be-detected area on the surface of the to-be-detected sample, so that the to-be-detected area is marked and determined.
And step two, covering half of the area to be detected by a shading plate.
The two paints used for comparison in this example were: when the interior wall paint I (three-tree fresh breath air purification emulsion paint) (on the left side of the figure 4) and the interior wall paint II (three-tree odor-free two-in-one interior wall finish paint) (on the right side of the figure 4) are used, a 100-micrometer wire rod is used for coating the two paints on the surface of an aluminum plate by using a coater; after the paint film was completely dried, the control was tested as described above. Under the condition of keeping out of the sun, after the indicator is completely dried, half of the indicator is respectively covered by a light screen, the indicator is placed under a 20-watt fluorescent lamp for irradiation for 1 hour, the fading condition is observed, the photocatalytic activity can be known through comparison, and the detection result is shown in figure 4:
as can be seen from the comparison of FIG. 4, the color fading of the left side color bar illuminated part is more obvious than that of the right side illuminated part, which shows that the photocatalytic activity of the left side photocatalytic coating I is obviously superior to that of the right side ordinary coating.
Phenomena to be noted are: because the prepared indicator has a certain attenuation in the light, the indicator also has a phenomenon of light fading on the surface of a common coating, but the degree and the rate of fading are low.
The photocatalytic activity of the inner wall paint I (three-tree fresh breath air purification emulsion paint) and the common inner wall paint II (three-tree odor-removal two-in-one inner wall paint) both with the visible light catalytic air purification function is detected according to the purification performance of JCT 1074-.
According to the standard of JC/T1074-2008 'indoor air purification function coating material purification performance', the two materials in the embodiment are tested, and the 24-hour formaldehyde purification efficiency is shown in the figures 5 and 6:
as proved by the test results of figures 5 and 6, the photocatalytic activity of the left inner wall paint I is obviously superior to that of the inner wall paint II, and the test results are the same as those of the invention.
Example 2
An indicator capable of rapidly qualitatively comparing the photocatalytic properties of materials, of two different formulations, the formulation of which is shown in table 2,
table 2 formulations of indicator one and indicator two of example 2
| Serial number | Name (R) | Indicator one content% (mass fraction) | Indicator two content% (mass fraction) |
| 1 | Anhydrous ethanol | 90 | 92 |
| 2 | Rhodamine B | 4 | 3 |
| 3 | Methylene blue | 6 | 5 |
| Total up to | 100 | 100 |
A detection method capable of rapidly qualitatively comparing photocatalytic performance of materials comprises the following specific steps:
firstly, marking the surface of a sample to be detected to determine a region to be detected;
secondly, uniformly coating the indicator on the area to be measured;
placing the sample to be tested coated with the indicator in the step two in a light-proof environment until the indicator is dried and then taking out the sample from the light-proof environment, and immediately covering a part of the area to be tested by using a shading plate;
fourthly, placing the sample to be detected after shading treatment in the third step under a fluorescent lamp for irradiating for 3 hours, and observing the fading degree of the indicator;
fifthly, comparing the fading degrees of more than two samples to be tested which are processed by the first step to the fourth step, the higher the fading degree is, the stronger the photocatalytic activity of the samples to be tested is.
In the first step, masking materials such as masking paper or adhesive tapes are used for masking the peripheral parts outside the to-be-detected area on the surface of the to-be-detected sample, so that the to-be-detected area is marked and determined.
And step two, covering half of the area to be detected by a shading plate.
The two paints used for comparison in this example were: when the interior wall paint I (three-tree fresh breath air purification emulsion paint) (on the left side of a figure 7) and the interior wall paint II (three-tree odor-free anti-aldehyde five-in-one interior wall paint) (on the right side of the figure 7) with the visible light catalytic air purification function are used, a 100-micrometer wire bar is used for coating two kinds of paint applicators on the surface of an aluminum plate; after the paint film was completely dried, the control was tested as described above. Under the condition of keeping out of the sun, after the indicator is completely dried, half of the indicator is respectively covered by a light screen, the indicator is placed under a 20-watt fluorescent lamp for irradiating for 3 hours, the fading condition is observed, the photocatalytic activity can be known through comparison, and the detection result is shown in figure 7:
as can be seen from a comparison of the results in FIG. 7, the color bars applied by the two test pens faded nearly to the illuminated portion, indicating that the two coatings cleaned equally well with the two different formulations of the indicator.
And (3) verification and comparison:
according to the standard of JC/T1074-2008 'indoor air purification function coating material purification performance', the formaldehyde purification efficiency in 24 hours is shown in the figures 8 and 9 by testing the two materials:
as shown in fig. 8 and 9, the test results prove that the formaldehyde purifying abilities of the first interior wall paint and the second interior wall paint of the present embodiment are similar to those of the present invention.
Example 3
An indicator capable of rapidly qualitatively comparing the photocatalytic performance of materials, the formula of which is shown in Table 3,
table 3 formulation of the indicator of example 3
| Serial number | Name (R) | Content% (mass fraction) |
| 1 | Anhydrous ethanol | 93 |
| 2 | Rhodamine B | 3 |
| 3 | Methylene blue | 4 |
| Total up to | 100 |
A detection method capable of rapidly qualitatively comparing photocatalytic performance of materials comprises the following specific steps:
firstly, marking the surface of a sample to be detected to determine a region to be detected;
secondly, uniformly coating the indicator on the area to be measured;
placing the sample to be tested coated with the indicator in the step two in a light-proof environment until the indicator is dried and then taking out the sample from the light-proof environment, and immediately covering a part of the area to be tested by using a shading plate;
fourthly, placing the sample to be detected after shading treatment in the third step under a fluorescent lamp for irradiation 1 to observe the fading degree of the indicator;
fifthly, comparing the fading degrees of more than two samples to be tested which are processed by the first step to the fourth step, the higher the fading degree is, the stronger the photocatalytic activity of the samples to be tested is.
In the first step, masking materials such as masking paper or adhesive tapes are used for masking the peripheral parts outside the to-be-detected area on the surface of the to-be-detected sample, so that the to-be-detected area is marked and determined.
And step two, covering half of the area to be detected by a shading plate.
The two paints used for comparison in this example were: when the paint is used, two paint applicators are coated on the surface of an aluminum plate by using a 100-micron line bar; after the paint film was completely dried, the control was tested as described above. Under the condition of keeping out of the sun, after the indicator is completely dried, half of the indicator is respectively covered by a light screen, the indicator is placed under a 20-watt fluorescent lamp for irradiation for 1 hour, the fading condition is observed, the photocatalytic activity can be known through comparison, and the detection result is shown in figure 10:
as can be seen from the comparison in fig. 10, the left side color bar illuminated portion faded more significantly than the right side illuminated portion, which shows that the photocatalytic activity of the interior wall paint one of the present embodiment is significantly better than that of the interior wall paint two of the present embodiment.
And (3) verification and comparison:
the two materials are tested according to the standard of JC/T1074-2008 'indoor air purification function coating material purification performance' to obtain 24-hour formaldehyde purification efficiency shown in figures 11 and 12,
as shown in fig. 11 and 12, the test results prove that the photocatalytic activity of the first interior wall paint on the left side of the present embodiment is obviously better than that of the second interior wall paint on the right side, and the test results are the same as the test results of the present invention.
The inventors could not clearly distinguish the photocatalytic performance of the two interior wall paints of examples 1-3 of the present invention by using rhodamine B or methylene blue alone.
The above embodiments are only some of the embodiments of the present invention, but the spirit of the present invention is not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (4)
1. An indicator capable of rapidly qualitatively comparing photocatalytic properties of materials, characterized by: the rhodamine B and methylene blue are mixed according to the mass ratio of 9.0-9.5: 0.2-0.4: 0.3-0.6 to obtain the rhodamine B blue pigment.
2. A detection method capable of rapidly qualitatively comparing photocatalytic performance of materials is characterized in that: comprises the following steps in sequence:
firstly, marking the surface of a sample to be detected to determine a region to be detected;
secondly, uniformly coating the indicator in the claim 1 on the area to be measured;
placing the sample to be tested coated with the indicator in the step two in a light-proof environment until the indicator is dried and then taking out the sample from the light-proof environment, and immediately covering a part of the area to be tested by using a shading plate;
fourthly, placing the sample to be detected after shading treatment in the third step under a fluorescent lamp for irradiating for 1 to 10 hours, and observing the fading degree of the indicator every 1 hour in the irradiation process;
fifthly, comparing the fading degrees of more than two samples to be tested which are processed by the first step to the fourth step, the higher the fading degree is, the stronger the photocatalytic activity of the samples to be tested is.
3. The detection method capable of rapidly performing qualitative comparison of photocatalytic performance of materials according to claim 2, characterized in that: in the first step, masking materials such as masking paper or adhesive tapes are used for masking the peripheral parts outside the to-be-detected area on the surface of the to-be-detected sample, so that the to-be-detected area is marked and determined.
4. The detection method capable of rapidly performing qualitative comparison of photocatalytic performance of materials according to claim 2, characterized in that: and step two, covering half of the area to be detected by a shading plate.
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Citations (6)
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| CN101021469A (en) * | 2007-03-20 | 2007-08-22 | 华中科技大学 | Method for detecting optical self-cleaning material photocatalysis performance by fluorophotometry |
| CN101246127A (en) * | 2008-02-29 | 2008-08-20 | 华中科技大学 | Paint for detecting photocatalysis performance and its preparation and application |
| CN104084200A (en) * | 2014-06-26 | 2014-10-08 | 北京工业大学 | Three-dimensional orderly macropore InVO4-BiVO4 supported noble metal nanometer photo-catalyst, preparation method and application of photo-catalyst |
| CN105929048A (en) * | 2016-04-19 | 2016-09-07 | 山东亿康环保科技有限公司 | Testing method for performance of photocatalytic air-purifying material |
| CN108816254A (en) * | 2018-06-19 | 2018-11-16 | 东北大学 | A kind of BiOI catalysis material and its preparation method and application |
| CN110180555A (en) * | 2019-04-02 | 2019-08-30 | 中原工学院 | A kind of preparation method and applications with three-layer laminated structure C uS catalyst |
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2020
- 2020-08-25 CN CN202010868837.3A patent/CN112033955A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021469A (en) * | 2007-03-20 | 2007-08-22 | 华中科技大学 | Method for detecting optical self-cleaning material photocatalysis performance by fluorophotometry |
| CN101246127A (en) * | 2008-02-29 | 2008-08-20 | 华中科技大学 | Paint for detecting photocatalysis performance and its preparation and application |
| CN104084200A (en) * | 2014-06-26 | 2014-10-08 | 北京工业大学 | Three-dimensional orderly macropore InVO4-BiVO4 supported noble metal nanometer photo-catalyst, preparation method and application of photo-catalyst |
| CN105929048A (en) * | 2016-04-19 | 2016-09-07 | 山东亿康环保科技有限公司 | Testing method for performance of photocatalytic air-purifying material |
| CN108816254A (en) * | 2018-06-19 | 2018-11-16 | 东北大学 | A kind of BiOI catalysis material and its preparation method and application |
| CN110180555A (en) * | 2019-04-02 | 2019-08-30 | 中原工学院 | A kind of preparation method and applications with three-layer laminated structure C uS catalyst |
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