• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Portable device for measuring photocatalytic activity and measuring procedure for photocatalytic activity The present invention relates to a portable device for measuring photocatalytic activity for application in agents with photocatalytic properties that performs the evaluation of photodegradation by colored organic and inorganic indicators, in contact with the target agent, activating the photocatalytic process with a system of controlled lighting, where the portable photocatalytic activity measurement device comprises an integrated system with color measurement detectors and a lighting system adapted to its use in different situations. The invention also relates to a method for measuring photocatalytic activity carried out with the above device. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2677144A1
    申请号:ES201631716
    申请日:2016-12-30
    公开日:2018-07-30
    发明作者:Eva JIMENEZ RELINQUE；Marta Castellote Armero
    申请人:Consejo Superior de Investigaciones Cientificas CSIC；
    IPC主号:
    专利说明:

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    PHOTOCATALITIC ACTIVITY MEASUREMENT PROCEDURE
    D E S C R I P C I O N
    OBJECT OF THE INVENTION
    The present invention relates to a portable device for measuring photocatatic activity for application in agents with photocatatic properties that performs the evaluation of photodegradation through colored organic and inorganic indicators, in contact with the target agent, activating the photocatatic process with a system of controlled lighting.
    The object of the present invention is a portable device for measuring photocatatic activity comprising an integrated system with color measurement detectors and a lighting system adapted to its use in different situations. Another object of the invention is a method of measuring photocatatic activity.
    BACKGROUND OF THE INVENTION
    - Photocatatic activity indicator inks are preferably organic dyes that in contact with a photocatatic agent show a change or disappearance of their color because they react with the active species formed on the surface of the photocatalyst during the activation process thereof with radiation ultraviolet or visible. The monitoring of this chromatic evolution allows to identify the presence of a heterogeneous photocatalyst and measure its activity. Two of the most widely used inks for this purpose are rhodamine B (RhB) due to its decrease in coordinate intensity to * (pink) and resazurin (Rz), which shows a color change from blue to pink.
    For this, chromatic models such as CIE L * a * b * (CIELAB) or RGB are used to visualize the measurements made.
    The CIE L * a * b * (CIELAB) model is the chromatic model normally used for
    Describe all the colors that the human eye can perceive. The axis * L is that of
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    luminosity (lightness) and goes from 0 (black) to 100 (white). The other two coordinate axes are a * and b *, and represent variation between reddish-greenish, and yellowish-bluish, respectively. Those cases in which a * = b * = 0 are achromatic; This is why the * L axis represents the gray achromatic scale that ranges from white to black.
    The RGB method is a chromatic model that is based on the decomposition of color in the three primary colors: red, green and blue, (R = Red, G = Green, B = Blue, their names in English, from ahl the name of the method). The different RGB methods for defining colors are based on the amount or intensity of a given color of each of the primary colors.
    Defining a color in RGB is therefore defining the amount of mixing of the three primary colors needed to achieve that color. Therefore a color defined in RGB will always have three numbers that define it. The first corresponds to the color red, the second to green, and the third to blue. The decimal RGB, the most widespread representation scale uses a scale for each number ranging from 0 to 255, with 0 being the absence of color and 255 being the maximum color.
    Devices for measuring photocatalytic activity of solid materials by coupling different measurement systems to a designed irradiation system are known in the state of the art.
    Among the above devices is the one described in the international application WO2006077169 relating to a device for measuring photocatatic activity of a photoactivated material with a radiation source that includes a measuring probe with a measuring head, where during the measurement the head reacts when positioned at a certain distance from the material to be measured by means of an indicator ink.
    However, the above devices can give rise to false negatives or underestimated measures of the photocatatic activity of the material because it is only capable of assessing the effect of active species with a life time high enough to transfer from the activated surface to the activated surface. detection probe or indicator ink.
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    The portable device for measuring photocatatic activity of the present invention has a configuration that allows to solve all the above inconveniences by providing a device that allows its use in different situations without depending on the composition of the substance or material to be analyzed.
    DESCRIPTION OF THE INVENTION
    The present invention relates to a portable device for measuring photocatatic activity for application in agents with photocatatic properties that performs the evaluation of photodegradation through colored organic and inorganic indicators, in contact with the target agent, activating the photocatatic process with a system of controlled lighting.
    The portable device for measuring photocatatic activity comprises a control unit connected to a detector comprising color sensors that detect the light reflected by an indicator ink in contact with the agent with photocatatic properties, where the detector is configured to be in contact Direct with the agent with photocatallistic properties.
    The portable device for measuring photocatatic activity further comprises an agent lighting system with photocatatic properties, preferably of selectable intensity level, preferably UV, Visible or IR.
    The device also includes visualization means where the operator can visualize the measurements taken, preferably in RGB or CIELAB mode.
    The portable device for measuring photocatatic activity of the present invention is able to distinguish the levels of photocatatic activity as a function of the color changes of the organic / inorganic substances in contact with any photocatatic agent in solid, liquid or suspension state. The device can be configured for continuous sampling of activated photocatatic agents, suitable for use in the laboratory by preferably USB connection or by means of a battery in the field, where in the latter case it can store the measurements made in an internal memory.
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    As configured, the portable device for measuring photocatatic activity allows to carry out:
    1) simple measurements of the color of the indicator ink in contact with the photocatatic agent using white light, making measurements continuously, which can be stored in the internal memory, and
    2) monitoring the evolution of the color of the indicator ink in contact with the photocatatic agent activating UV or visible light according to the type of photodegradation desired.
    Thus, the portable device for measuring photocatalytic activity asl configured has the following advantages:
    - It is fully automated integrated by an electronic measurement system coupled to a lighting system, which allows an immediate reading of the photoactivity of a photocatatic agent.
    - allows the measurement of agents in solid, liquid or suspended state.
    - allows a flexible use of the radiation source provided, either UV or VIS radiation, of the maximum wavelength and the intensity of radiation that is modulable.
    - allows measurement in the laboratory or on-site.
    The invention also relates to a method of measuring photocatatic activity by means of the portable measuring device described above comprising:
    - a stage of direct contact of the detector with the agent with photocatatic properties, and
    - a stage of measurement of photocatatic activity based on the color variation of the indicator probe.
    The team determines the color variation of the probe due to the process of
    photocatatic degradation based on the percentage of probe degradation
    during the photoactivation of the photocatatic material (square root of the squares of
    the differences between the signals L, a and b measured and those of the initial cycle), constant of
    time in seconds color coordinates L *, a * and b *; (labtau (s) and abtau (s)) and time in
    seconds in which the probe degrades by 90% considering the coordinates of
    color L *, a * and b * (Lab90% and ab90%), being tau (s) the unit of time to define a
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    exponential process such as the case of the color of an indicator probe during photoactivation.
    With the measurement procedure as! defined, false negatives or underestimated measures of the photocatatic activity of the material are avoided because it allows a complete detection of the active species formed on the surface of the photocatalyst that are responsible for the photoactivity of the material regardless of their life time or its possibility of diffusion in the air. In this way, the reproducibility and precision of the measurements are also ensured. It also allows the evaluation of surface parameters of the photocatatic agent that directly affect the resulting photoactivity (roughness, porosity).
    In addition, when carrying out a measurement stage by direct contact it is possible to determine species that diffuse in the air.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 shows a block diagram of the portable device for measuring photocatatic activity according to the present invention.
    Figures 2a and 2b show an example of the results obtained from the color variation of an indicator probe by photoactivating a photocatatic material, where Figure 2a) shows an example of results of the color coordinate values L *, a * yb * (CIEL *, CIEa * and CIEb *) and calculation of the percentage of degradation of the probe during photoactivation of the photocatatic material (square root of the squares of the differences between the current L, a and b signals and those of the initial cycle) and Figure 2b) shows values of the color or distance variation (square root of the squares of the differences between the current L, a and b signals and those of the initial cycle). Dlabmax: maximum distance color coordinates L *, a * and b *; Dabmax: maximum distance color coordinates a * and b *; Labtau (s): time constant in second color coordinates L *, a * and b *; abtau (s): time constant in second color coordinates a * and b *; Lab90% time in seconds in which the probe degrades by 90% considering the color coordinates L *, a * and b *; ab90% time in seconds in which the probe degrades by 90% considering the color coordinates a * and b * ;.
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    Next, the portable device for measuring photocatalytic activity of the present invention will be described in detail.
    The portable device for measuring photocatalytic activity comprises a control unit (1) connected to a detector (2, 3) comprising color sensors (8), preferably for the red (R), green (G) and blue components (B), of the light reflected by an indicator ink (4) in contact with an agent with photocatalytic properties (5), where the detector (2, 3) is configured to be in direct contact with the agent with photocatalytic properties (5 ).
    In this example of realization, the detector can be a detector for solid agents (2) or a detector for liquid or suspended agents (3) arranged in a cuvette.
    The device comprises a lighting system (6), preferably UV UV or Visible VIS, of selectable levels, where the detector (2, 3) allows measurements of photocatalytic activity in solids or liquids / suspensions.
    Preferably, the lighting system comprises several light emitters for measurements in liquid or suspended agent, or solid respectively.
    The UV illumination used can correspond to any wavelength, preferably 365 nm and its irradiation intensity can be modified from 0 to 30 W / m2. The Visible illumination used has a wavelength from 400 nm to 700 nm and allows to select the power levels of each component (red, green, blue) as well as the generation of white light necessary for the correct measurement of color.
    The device also includes visualization means where the operator can visualize the measurements taken, preferably in RGB or CIELAB mode. These visualization means (7) are an LCD screen.
    In case the detector is a detector for solid agents (2), the procedure
    for measuring photocatalytic activity using the portable measuring device
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    It comprises the following stages:
    - a stage for connecting the detector for solid agents (2) to the control unit (1),
    - a stage of direct contact of the detector for solid agents (2) with the agent with photocatatic properties (5) based on the color variation of the indicator probe,
    - a stage of measurement of photocatatic activity.
    If the detector is a detector for liquid or suspended agents (3), the measuring device also includes a magnetic stirrer and a magnetic bar, where the method of measuring photocatatic activity by means of the portable measuring device comprises the following stages:
    - a step of bringing the ink (4) into contact with the agent with photocatallic properties (5) arranged in a cuvette based on the color variation of the indicator probe,
    - a stage for connecting the detector for liquid agents (3) to the control unit (1),
    - a stage of direct contact of the detector for liquid agents (3) with the agent with photocatatic properties (5),
    - a stage of disposition of the detector for liquid or suspended agents (3) on the magnetic stirrer,
    - a stage of introduction of the magnetic bar in the measuring cuvette
    - a stage of activation of the magnetic stirrer,
    - a stage of measurement of photocatatic activity.
    权利要求:
    Claims (13)
    [1]
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    1. - Portable device for measuring photocatatic activity comprising a control unit (1) connected to a detector (2, 3) which in turn comprises color sensors (8) that detect the light reflected by an indicator ink ( 4) in contact with an agent with photocatatic properties (5) characterized in that the detector (2, 3) is configured to be in direct contact with the agent with photocatatic properties (5).
    [2]
    2. - Portable device for measuring photocatatic activity according to claim 1 characterized in that it comprises a lighting system (6) of selectable levels.
    [3]
    3. - Portable device for measuring photocatatic activity according to claim 2, characterized in that the lighting system (6) is UV, has a variable wavelength and a modifiable irradiation intensity of 0 to 30 W / m2.
    [4]
    4. - Portable device for measuring photocatatic activity according to claim 2 characterized in that the lighting system (6) is Visible, has a wavelength from 400 nm to 700 nm and allows to select the power levels of each component, as! as the generation of white light necessary for the correct measurement of color.
    [5]
    5. - Portable device for measuring photocatatic activity according to claim 2, characterized in that the lighting system (6) is IR.
    [6]
    6. - Portable device for measuring photocatatic activity according to any of the preceding claims, characterized in that it comprises display means (7) of the measurements performed.
    [7]
    7. - Portable device for measuring photocatatic activity according to claim 6, characterized in that the visualization means (7) is an LCD screen.
    [8]
    8. - Portable device for measuring photocatatic activity according to any of
    the preceding claims characterized in that the detector is a detector for
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    solid agents (2).
    [9]
    9. - Portable device for measuring photocatatic activity according to any of the preceding claims characterized in that the detector is a detector for liquid or suspended agents (3).
    [10]
    10. - Portable device for measuring photocatatic activity according to claim 9 characterized in that it also comprises a magnetic stirrer and a magnetic bar,
    [11]
    11. - Procedure for measuring photocatatic activity by means of the portable measuring device of any of the preceding claims characterized in that it comprises:
    - a stage of direct contact of the detector (2, 3) with the agent with photocatatic properties (5), and
    - a stage of measurement of photocatatic activity based on the color variation of the indicator probe.
    [12]
    12. - Procedure for measuring photocatatic activity by means of the portable measuring device of claim 8 characterized in that it further comprises:
    - a stage of connection of the detector for solid agents (2) to the control unit (1), prior to the stage of direct contact of the detector
    (2) with the agent with photocatatic properties (5) based on the color variation of the indicator probe.
    [13]
    13. - Procedure for measuring photocatatic activity by means of the portable measuring device of claim 10 characterized in that it also comprises:
    - a step of contacting the ink (4) with the agent with photocatalytic properties (5) arranged in a cuvette, and
    - a stage for connecting the detector for liquid or suspended agents (3) to the control unit (1), prior to the stage of direct contact of the detector for liquid or suspended agents (3) with the agent with properties photocatallics (5), and
    - a stage of disposition of the detector for liquid or suspended agents
    (3) on the magnetic stirrer,
    - a stage of introduction of the magnetic bar in the measuring cuvette
    - a stage of activation of the magnetic stirrer,
    - a stage of measurement of photocatatic activity,
    after the stage of direct contact of the detector for liquid agents or 5 in suspension (3) with the agent with photocatatic properties (5).
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    同族专利:
    公开号 | 公开日
    ES2677144B1|2019-05-30|
    WO2018122437A1|2018-07-05|
    EP3564656A1|2019-11-06|
    EP3564656A4|2020-07-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5369481A|1992-05-08|1994-11-29|X-Rite, Incorporated|Portable spectrophotometer|
    JP4742378B2|2001-02-01|2011-08-10|独立行政法人日本原子力研究開発機構|Method and apparatus for evaluating oxidative degradation activity of photocatalyst|
    DE102005003878B3|2005-01-24|2006-07-13|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Measuring device for measuring the photocatalytic activity of a photocatalytic layer|
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    DE102009043378B4|2009-08-13|2011-04-07|Technische Universität Braunschweig|Method and use of luminescent compounds for measuring a photocatalytic surface activity|
    GB201100709D0|2011-01-17|2011-03-02|Bio Nano Consulting|A portable apparatus for measuring the efficiency of a photocatalyst|
    DE102014217176A1|2014-08-28|2016-03-03|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Measuring device with measuring head and use of the measuring device in a method for assessing the photocatalytic effectiveness of surfaces|CN111505072B|2020-04-15|2021-02-09|浙江大学|Portable laser catalysis detection device and method|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201631716A|ES2677144B1|2016-12-30|2016-12-30|PORTABLE DEVICE FOR PHOTOCATALYTIC ACTIVITY MEASURE AND PHOTOCATALYTIC ACTIVITY MEASUREMENT PROCEDURE|ES201631716A| ES2677144B1|2016-12-30|2016-12-30|PORTABLE DEVICE FOR PHOTOCATALYTIC ACTIVITY MEASURE AND PHOTOCATALYTIC ACTIVITY MEASUREMENT PROCEDURE|
    EP17886405.4A| EP3564656A4|2016-12-30|2017-12-28|Portable device for measuring photocatalytic activity and method for measuring photocatalytic activity|
    PCT/ES2017/070861| WO2018122437A1|2016-12-30|2017-12-28|Portable device for measuring photocatalytic activity and method for measuring photocatalytic activity|
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