CN217638834U - Device for detecting concentration of ozone in water - Google Patents
Device for detecting concentration of ozone in water Download PDFInfo
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- CN217638834U CN217638834U CN202220287349.8U CN202220287349U CN217638834U CN 217638834 U CN217638834 U CN 217638834U CN 202220287349 U CN202220287349 U CN 202220287349U CN 217638834 U CN217638834 U CN 217638834U
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Abstract
The device for detecting the concentration of ozone in water comprises a detector, a potentiostat, a working electrode, a reference electrode, a counter electrode and a return-to-zero auxiliary electrode, wherein the detector is internally divided into a solution chamber and a detection chamber by a cation exchange membrane, an electrolyte solution is filled in the solution chamber, and the ozone water flows through the detection chamber at a constant current; the reference electrode and the counter electrode are both arranged in the solution chamber, and the working electrode and the return-to-zero auxiliary electrode are arranged in the detection chamber; the working electrode, the reference electrode and the counter electrode are respectively and electrically connected with a constant potential rectifier through electrode leads, the constant potential rectifier is electrically connected with a display, and the working electrode and the return-to-zero auxiliary electrode are connected with a negative pulse generator through the electrode leads. The utility model discloses eliminate the "hysteresis" condition of inspection aquatic ozone concentration, improve and detect the precision, realize online accurate detection, also can accurate detection high concentration's ozone water, the wide application is in the ozone water production field.
Description
Technical Field
The utility model relates to an aquatic ozone concentration detection technical field especially relates to an aquatic ozone concentration detection device.
Background
Ozone (O) 3 ) It is a strong oxidant and strong bactericide without secondary pollution. The ozone water purification device has wide application in the fields of drinking water, food processing, medical treatment and health, chemical industry, semiconductor industry and environmental protection, and particularly has very wide application prospect of ozone water, so that the online monitoring of the concentration of ozone in water is very important; at present, the concentration of ozone in water is mostly detected by off-site off-line sampling (such as an ultraviolet spectroscopy and an iodometry), and the technical requirements of producing ozone water on site cannot be met.
In the prior art, the ozone water concentration detection technology has the problems that the ozone water on an electrode interface can not be automatically and stably updated in time and the detected ozone concentration is seriously lagged.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the utility model provides an aquatic ozone concentration detection device, concrete technical scheme is:
the device for detecting the concentration of ozone in water comprises a detector, a potentiostat, a working electrode, a reference electrode, a counter electrode and a return-to-zero auxiliary electrode, wherein the detector is internally divided into a solution chamber and a detection chamber by a cation exchange membrane, an electrolyte solution is filled in the solution chamber, and the ozone water flows through the detection chamber at a constant current; the reference electrode and the counter electrode are both arranged in the solution chamber, and the working electrode and the return-to-zero auxiliary electrode are arranged in the detection chamber in a manner of clinging to the cation exchange membrane; the working electrode, the reference electrode and the counter electrode are respectively and electrically connected with a potentiostat through electrode leads, the potentiostat is electrically connected with a display for displaying the concentration of ozone in water, and the working electrode and the return-to-zero auxiliary electrode are connected with a negative pulse generator through the electrode leads.
Further, the electrolyte solution is 0.1-0.5 mol/L NaCl and 0.1-0.2 mol/L H 2 SO 4 The electrolyte solution is mixed.
Furthermore, a constant-flow metering pump is arranged on an ozone water inlet pipeline of the detection chamber.
Further, a noble metal thin layer is formed on the surface of the cation exchange membrane through deposition by a chemical deposition method so as to form a working electrode and a return-to-zero auxiliary electrode.
Further, the working electrode and the return-to-zero auxiliary electrode are made of gold, platinum or nickel.
The utility model discloses beneficial effect:
(1) A negative pulse generator is adopted to eliminate the 'lag' condition generated by ozone adsorbed on the surface of the working electrode in time, so that the detection precision is improved, and the online accurate detection is realized;
(2) A constant-current metering pump is arranged to continuously and steadily update the detected ozone water in the detection chamber, so that the influence of water flow fluctuation on the detection precision is avoided;
(3) A cation exchange membrane is adopted to separate the solution chamber and the detection chamber, so that the potential stability of the reference electrode is ensured, and the detection precision is improved;
(4) The device can accurately detect the high-concentration ozone water and can be widely applied to the ozone water production field.
Drawings
Fig. 1 is a schematic view of the device for detecting ozone concentration in water.
Fig. 2 is a schematic diagram of the working electrode and the return-to-zero auxiliary electrode chemical deposition according to the present invention.
FIG. 3 shows the ozone water concentration and the peak value of the ozone reduction current (I) in example 1 of the present invention P ) A graph of the relationship (c).
FIG. 4 shows the ozone water concentration and the peak value of the ozone reduction current (I) in example 2 of the present invention P ) A graph of the relationship (c).
FIG. 5 shows the ozone water concentration and the peak value of the ozone reduction current (I) in example 3 of the present invention P ) A graph of the relationship (c).
In the figure: the device comprises a detector 1, a solution chamber 101, a detection chamber 102, a working electrode 103, a reference electrode 104, a counter electrode 105, an auxiliary zero-resetting electrode 106, a cation exchange membrane 107, a potentiostat 2, a display 3, a pulse generator 4, a constant-current metering pump 5, a liquid inlet pipe 6, a liquid outlet pipe 7, a deposition chamber 8, a first 801 chamber, a second 802 chamber, an ion chamber 9, a reduction chamber 10, a circulating pipe 11, a circulating pump 12 and a gas outlet pipe 13.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
as shown in fig. 1, the device for detecting the concentration of ozone in water comprises a detector 1, a potentiostat 2, a return-to-zero auxiliary electrode 106, a working electrode 103, a reference electrode 104 and a counter electrode 105 which are arranged in the detector 1, wherein the detector 1 is internally divided into a solution chamber 101 and a detection chamber 102 by a cation exchange membrane 107, the solution chamber 101 is filled with an electrolyte solution, and ozone water flows through the detection chamber 102 at a constant current; the reference electrode 104 and the counter electrode 105 are both arranged in the solution chamber 101, and the working electrode 103 and the return-to-zero auxiliary electrode 106 are arranged in the detection chamber 102 in a manner of being tightly attached to the cation exchange membrane 107; the working electrode 103, the reference electrode 104 and the counter electrode 105 are respectively and electrically connected with a potentiostat 2 through electrode leads, the potentiostat 2 is electrically connected with a display 3 for displaying the concentration of ozone in water, and the working electrode 103 and the return-to-zero auxiliary electrode 106 are connected with a negative pulse generator 4 through electrode leads.
Wherein the electrolyte solution is 0.1-0.5 mol/L NaCl and 0.1-0.2 molH of/L 2 SO 4 The electrolyte solution is mixed.
Specifically, the solution chamber 101 and the detection chamber 102 are respectively located at the upper and lower parts of the cation exchange membrane 107, and the working electrode 103 and the return-to-zero auxiliary electrode 106 are arranged on the bottom surface of the cation exchange membrane 107; the bottom surface of the detection chamber 102 is provided with a liquid inlet pipe 6, the liquid inlet pipe 6 is provided with a constant-current metering pump 5, and the upper part of the detection chamber 102 close to the return-to-zero auxiliary electrode 106 is provided with a liquid outlet pipe 7, so that a detected ozone water sample flowing through the surfaces of the working electrode 103 and the cation exchange membrane 107 can be updated in time.
The reference electrode 104 is made of silver/silver chloride, the counter electrode 105 is made of platinum, and the reference electrode 104 and the counter electrode 105 can be made into rod-shaped or plate-shaped; the surface of the cation exchange membrane 107 is deposited to form a noble metal thin layer by a chemical deposition method so as to form the working electrode 103 and the return-to-zero auxiliary electrode 106.
Preferably, the thin noble metal layers of the working electrode 103 and the return-to-zero auxiliary electrode 106 are gold, platinum or nickel.
The process of this device detection aquatic ozone concentration does:
the detected ozone water flows through the detection chamber 102 through the constant-current metering pump 5, is fully contacted with the working electrode 103, and is continuously updated under the action of the constant-current metering pump 5. The reference electrode 104, the counter electrode 105 and the working electrode 103 are connected to a potentiostat, ensuring that a given constant potential is between the reference electrode 104 and the working electrode 103, and the potentiostat 2 outputs an ozone reduction current peak value (I) P ) To the display 3, the ozone reduces the current peak (I) P ) Shows a certain linear change along with the ozone water concentration (mg/L); meanwhile, the negative pulse generator 4 immediately applies a negative pulse signal between the working electrode 103 and the return-to-zero auxiliary electrode 106 after the previous detection, so that the working electrode 103 is returned to zero in time, the 'lag' condition caused by the residual ozone adsorbed on the surface of the working electrode 103 is eliminated, the detection precision is improved, and the online accurate detection is realized.
Wherein, the negative pulse generator 4 can set corresponding negative pulse signals according to parameters such as detection frequency, ozone concentration range in water and the like.
The process of forming the working electrode 103 and the return-to-zero auxiliary electrode 106 by deposition on the surface of the cation exchange membrane 107 is as follows:
fig. 2 shows a schematic diagram of an apparatus for chemical deposition of a metal/cation exchange membrane 107.
The chemical deposition device comprises a deposition chamber 8, an ion chamber 9 filled with metal ion solution and a reduction chamber 10 filled with reducing agent solution, wherein the top parts of the reduction chamber 10 and the ion chamber 9 are respectively provided with an air outlet pipe 13, and the middle part of the deposition chamber 8 is provided with a cation exchange membrane 107 so as to divide the deposition chamber 8 into a first chamber 801 and a second chamber 802; wherein, the top and the bottom of the ion chamber 9 and the first chamber 801 are respectively communicated through a circulating pipe 11, the top and the bottom of the reduction chamber 10 and the second chamber 802 are respectively communicated through a circulating pipe 11, and the circulating pipes 11 at the two bottoms are respectively provided with a circulating pump 12.
As an example, the metal ion solution phase at least contains one noble metal and n-butanol solution, and the metal ion solution is enabled to flow uniformly in the ion chamber 9 and the chamber I801 under the action of the circulating pump 12; the reducing agent solution phase contains at least one reducing agent (e.g., naBH) 4 ) Under the action of the circulating pump 12, the reducing agent solution flows uniformly in the reduction chamber 10 and the second chamber 802. The temperature of the solution in the first chamber 801 and the second chamber 802 at the two sides of the cation exchange membrane 107 is controlled to be 20-40 ℃; at this time, the metal ions and the reducing agent in the solution phases of the first chamber 801 and the second chamber 802 diffuse and migrate oppositely, and a thin layer of metal is formed after the chemical deposition for 4 to 8 hours on the side of the cation exchange membrane 107/metal ion solution interface, so that the working electrode 103 and the return-to-zero auxiliary electrode 106 are formed on the surface of the cation exchange membrane 107 at a zero-pitch.
Preferably, the concentrations of the metal ion solution and the reducing agent solution on both sides of the cation exchange membrane 107 are both 0.0125 mol/L to 0.0250mol/L.
Example 1:
the noble metal of the working electrode 103 and the return-to-zero auxiliary electrode 106 deposited on the surface of the cation exchange membrane 107 is gold (Au), but the working electrode 103 and the return-to-zero auxiliary electrode 106 are not connected or the negative pulse generator 4 is not started (namely, the return-to-zero auxiliary electrode 106 fails, the working electrode 103 cannot return to zero in time, and the surface of the working electrode 103 can adsorb residual unreduced ozone).
Wherein, a constant potential instrument applies a given potential of-0.5V, and the device is adopted to detect the concentration (mg/L) of ozone water and the peak value (I) of ozone reduction current on line P ) The correlation of (2) is shown in FIG. 3, and the correlation coefficient of the linear fit is 98.97%.
Example 2:
the noble metal deposited on the working electrode 103 and the return-to-zero auxiliary electrode 106 on the surface of the cation exchange membrane 107 is gold (Au), and is connected to the negative pulse generator 4, and the parameters of the negative pulse signal generated by the negative pulse generator 4 are as follows: the pulse height is more than or equal to 1.23V, and the pulse width is 1-2 seconds.
Wherein, a constant potential meter applies a given potential of-0.5V, and the device is adopted to detect the concentration (mg/L) of ozone water and the peak value (I) of ozone reduction current on line P ) The correlation coefficient of the linear fit of (a) is 99.51%, as shown in FIG. 4.
Example 3:
the noble metal of the working electrode 103 and the return-to-zero auxiliary electrode 106 deposited on the surface of the cation exchange membrane 107 is gold (Au), and is connected to the negative pulse generator 4, and the parameters of the negative pulse signal generated by the negative pulse generator 4 are as follows: the pulse height is more than or equal to 1.23V, and the pulse width is 1-2 seconds.
Wherein, a constant potential instrument applies a given potential of-0.5V, and the device is adopted to detect the concentration (mg/L) of ozone water and the peak value (I) of ozone reduction current on line P ) The correlation coefficient of the linear fit of (a) is 99.95% as shown in FIG. 5.
As shown in FIGS. 3 and 4, when detecting a high ozone concentration in water, the ozone water concentration (mg/L) and the peak value of the ozone reduction current (I) were measured P ) The linear fitting correlation coefficients of (a) are all higher, and after the zero-return auxiliary electrode 106 is arranged and used, the detection precision of the ozone concentration in water can be improved.
As shown in FIGS. 4 and 5, when the return-to-zero auxiliary electrode 106 is activated, the ozone water concentration (mg/L) and the peak value (I) of the ozone reduction current P ) The linear fitting correlation coefficient of (2) is higher, and when the linear fitting correlation coefficient is used for detecting low ozone concentration in water, the detection precision of the ozone concentration in water is improved more obviously.
In fig. 3 to 5, the parameters are:
r-represents a linear fit correlation coefficient;
SD- -denotes standard deviation, standard deviation;
n-represents the number of data sets, samples;
p- -represents the probability that the 0 hypothesis holds.
Claims (4)
1. The utility model provides an aquatic ozone concentration detection device, includes detector, potentiostat and sets up working electrode, reference electrode, counter electrode in the detector, its characterized in that: the detector is internally divided into a solution chamber and a detection chamber by a cation exchange membrane, the solution chamber is filled with electrolyte solution, and ozone water flows through the detection chamber at a constant current; the reference electrode and the counter electrode are both arranged in the solution chamber, and the working electrode and the return-to-zero auxiliary electrode are arranged in the detection chamber in a manner of clinging to the cation exchange membrane; the working electrode, the reference electrode and the counter electrode are respectively and electrically connected with a potentiostat through electrode leads, the potentiostat is electrically connected with a display for displaying the concentration of ozone in water, and the working electrode and the return-to-zero auxiliary electrode are connected with a negative pulse generator through the electrode leads.
2. The apparatus for detecting ozone concentration in water according to claim 1, wherein: and a constant-flow metering pump is arranged on an ozone water inlet pipeline of the detection chamber.
3. The apparatus for detecting ozone concentration in water according to claim 1, wherein: and depositing the surface of the cation exchange membrane by adopting a chemical deposition method to form a noble metal thin layer so as to form a working electrode and a return-to-zero auxiliary electrode.
4. The apparatus for detecting ozone concentration in water according to claim 3, wherein: the working electrode and the return-to-zero auxiliary electrode are made of gold, platinum or nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220287349.8U CN217638834U (en) | 2022-02-14 | 2022-02-14 | Device for detecting concentration of ozone in water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220287349.8U CN217638834U (en) | 2022-02-14 | 2022-02-14 | Device for detecting concentration of ozone in water |
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| Publication Number | Publication Date |
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| CN217638834U true CN217638834U (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220287349.8U Active CN217638834U (en) | 2022-02-14 | 2022-02-14 | Device for detecting concentration of ozone in water |
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