CN112362616B - Optical fiber sensor for selectively measuring concentration of parachlorophenol - Google Patents
Optical fiber sensor for selectively measuring concentration of parachlorophenol Download PDFInfo
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- CN112362616B CN112362616B CN202011248013.2A CN202011248013A CN112362616B CN 112362616 B CN112362616 B CN 112362616B CN 202011248013 A CN202011248013 A CN 202011248013A CN 112362616 B CN112362616 B CN 112362616B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 111
- WXNZTHHGJRFXKQ-UHFFFAOYSA-N 4-chlorophenol Chemical compound OC1=CC=C(Cl)C=C1 WXNZTHHGJRFXKQ-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229940090668 parachlorophenol Drugs 0.000 title claims abstract description 74
- 229920000642 polymer Polymers 0.000 claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 229920000344 molecularly imprinted polymer Polymers 0.000 claims description 36
- 239000000178 monomer Substances 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 15
- 239000003431 cross linking reagent Substances 0.000 claims description 13
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- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Substances CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 claims description 4
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- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 9
- 108010025899 gelatin film Proteins 0.000 description 9
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 8
- 239000003999 initiator Substances 0.000 description 7
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- VGVRPFIJEJYOFN-UHFFFAOYSA-N 2,3,4,6-tetrachlorophenol Chemical class OC1=C(Cl)C=C(Cl)C(Cl)=C1Cl VGVRPFIJEJYOFN-UHFFFAOYSA-N 0.000 description 2
- OXYZDRAJMHGSMW-UHFFFAOYSA-N 3-chloropropyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)CCCCl OXYZDRAJMHGSMW-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract
The invention discloses an optical fiber sensor for selectively measuring the concentration of parachlorophenol, which comprises a sensor shell, an input optical fiber, a plurality of receiving optical fibers and a concave reflector, wherein the input optical fiber is arranged on the sensor shell; the method is characterized in that the receiving optical fiber is an optical fiber sensitive to parachlorophenol selectivity, the rear section of the optical fiber sensitive to parachlorophenol selectivity is ground into a semicircular arc shape along the length direction, and the ground surface is coated with molecular imprinting polymer gel sensitive to parachlorophenol selectivity; the sensor shell is cylindrical, the front part of the sensor shell is a solid body, the rear part of the sensor shell is a hollow body, and a liquid inlet notch is formed in the side wall of the hollow body; the center of the solid body is provided with an input optical fiber mounting hole along the axial direction, the outer side of the input optical fiber mounting hole is provided with a plurality of receiving optical fiber mounting holes, and the rear end of the input optical fiber enters the hollow body at the rear part of the sensor shell through the input optical fiber mounting hole; the invention can be widely applied to the fields of environmental protection, chemical industry, biochemical detection and the like.
Description
Technical Field
The invention relates to an optical fiber sensor, in particular to an optical fiber sensor for selectively measuring the concentration of parachlorophenol.
Background
Phenolic compounds are very important organic matters in the current industrial production, are widely applied to the industrial production of papermaking, printing and dyeing, textile and the like as production raw materials, and play a great role in agricultural production as pesticides, plant growth regulators and herbicides. P-chlorophenol, a typical phenolic compound, is widely used in the industries of herbicides, fungicides, insecticides, and medicines and dyes, and thus inevitably exists in wastewater of many industries. However, parachlorophenol has adverse effects on the eyes, skin, mucous membranes and upper respiratory tract and negatively affects biological processes. Many countries have strict regulations on the residue of chlorophenols in the environment, which are among the contaminants that are preferentially controlled in China, the United states, and the European Union. In order to effectively manage the concentration of parachlorophenol in discharged wastewater and reduce the harmful effect of parachlorophenol on human health caused by pollution of parachlorophenol to water environment, rapid and accurate determination of the concentration of parachlorophenol in water is a common focus of attention.
At present, the method for detecting the parachlorophenol in the water body mainly comprises the following steps: gas chromatography-mass spectrometry (GC-MS), high Performance Liquid Chromatography (HPLC), high performance liquid chromatography-mass spectrometry (HPLC-MS), ultraviolet-visible spectrophotometry (UV/VS-SPE), and the like. Although the methods are mainstream methods for analyzing parachlorophenol in water, most of water environment samples have the characteristics of more suspended matters, complex matrixes and low content of target analytes, a series of pretreatment is needed before sample analysis, secondary pollution is easy to introduce, and the influence of human factors is large and time is consumed; more importantly, the analysis methods are difficult to realize real-time, online and in-situ detection of water quality. In-line sensors (i.e., electrochemical and optical sensors) have been rapidly developed for the detection of parachlorophenol, wherein electrochemical sensors have been reported to have a close oxidation potential to chlorophenols having a similar structure, and thus selective determination of parachlorophenol concentration cannot be achieved. The optical fiber sensor can be combined with different sensitive materials due to good biochemical compatibility, so that the selective determination of the concentration of the parachlorophenol can be realized.
The good biochemical compatibility of the fiber optic sensor enables the fiber optic sensor to be used in combination with various sensitive materials for concentration determination of specific substances. To achieve the selective determination of parachlorophenol in water, it is first necessary to select a sensitive material that is selective for parachlorophenol. A molecularly imprinted polymer is a typical polymer having selectivity, which is mainly a polymer produced by polymerizing a functional monomer in the presence of a crosslinking agent with a specific target molecule, and which has a cavity complementary to the shape, size and functional group of the template molecule inside, so that the molecularly imprinted polymer has good selectivity for the target molecule. Meanwhile, the synthesis method of the molecularly imprinted polymer is simple, the synthesis cost is low, the method has the advantage of strong specific recognition, and the molecularly imprinted polymer is an ideal selective material. However, currently, few researches on the molecular imprinting polymer with the selectivity on the parachlorophenol are carried out, and no related products or literature data report on the optical fiber sensor for selectively measuring the parachlorophenol concentration based on the molecular imprinting polymer exist, so that the research on the optical fiber sensor for selectively measuring the parachlorophenol concentration based on the molecular imprinting polymer is extremely important, and the research has an effect of promoting the selective measurement on the parachlorophenol concentration and the monitoring and treatment on the parachlorophenol in the water environment.
Disclosure of Invention
The invention aims to provide an optical fiber sensor for selectively measuring the concentration of parachlorophenol.
The technical scheme of the invention is as follows: an optical fiber sensor for selectively measuring the concentration of parachlorophenol comprises a sensor shell, an input optical fiber, a plurality of receiving optical fibers and a concave reflecting mirror; the method is characterized in that the receiving optical fiber is an optical fiber which is sensitive to the selectivity of the parachlorophenol, the rear section of the optical fiber which is sensitive to the selectivity of the parachlorophenol is ground into a semi-circular arc shape along the length direction, and the ground surface is coated with molecular imprinting polymer gel which is sensitive to the selectivity of the parachlorophenol;
The sensor shell is cylindrical, the front part of the sensor shell is a solid body, the rear part of the sensor shell is a hollow body, and the side wall of the hollow body is provided with a liquid inlet notch; the center of the solid body is provided with an input optical fiber mounting hole along the axial direction, a plurality of receiving optical fiber mounting holes are formed in the outer side of the input optical fiber mounting hole, the rear ends of the input optical fibers enter the hollow body of the sensor shell through the input optical fiber mounting holes, and the rear ends of all the receiving optical fibers enter the hollow body of the sensor shell through the receiving optical fiber mounting holes respectively.
The rear sides of the input optical fiber and the receiving optical fiber are provided with concave reflectors, the concave reflectors are spaced from the tail ends of the input optical fiber and the receiving optical fiber, and the concave reflectors are wrapped by waterproof breathable films.
According to the preferred embodiment of the optical fiber sensor for selectively measuring the concentration of parachlorophenol, the concave reflecting mirror is fixed by the mounting bracket.
According to the preferred scheme of the optical fiber sensor for selectively measuring the concentration of parachlorophenol, the mounting bracket comprises a mounting plate and a fixing plate, the fixing plate is vertically connected to the side wall of the mounting plate, the concave reflector is fixed on the inner end surface of the mounting plate, and the fixing plate is fixed on the side wall of the sensor shell through a fixing knob.
According to the preferred scheme of the optical fiber sensor for selectively measuring the concentration of the parachlorophenol, the molecularly imprinted polymer gel is prepared by adopting a mixed solution of template molecules, functional monomers, a cross-linking agent and an initiator to carry out polymerization reaction to obtain the molecularly imprinted polymer, and then preparing the molecularly imprinted polymer gel from the molecularly imprinted polymer.
According to the preferred scheme of the optical fiber sensor for selectively measuring the concentration of the parachlorophenol, the parachlorophenol is adopted as the template molecule, the methacrylic acid, the acrylamide or the methyl methacrylate is adopted as the functional monomer, and the ethylene glycol dimethacrylate is adopted as the crosslinking agent.
The optical fiber sensor for selectively measuring the concentration of the parachlorophenol has the beneficial effects that the invention not only can accurately measure the concentration information of the parachlorophenol in the water solution with known components; and the concentration selectivity determination of the parachlorophenol in the unknown multi-component aqueous solution can be realized; the method has the advantages of high selectivity and rapid determination of the concentration of the parachlorophenol in the water, and can be widely applied to the fields of environmental protection, chemical industry, biochemical detection and the like.
Drawings
Fig. 1 is a schematic structural diagram of a new fiber bragg grating hydrogen sensor in accordance with the present invention.
Fig. 2 is a schematic diagram of the structure of a receiving fiber 1 according to the present invention.
FIG. 3 shows the real-time response of the optical fiber sensor of the present invention to parachlorophenol at a concentration of 0-300 mg/L.
Detailed Description
Example 1 referring to fig. 1, an optical fiber sensor for selectively measuring the concentration of parachlorophenol comprises a sensor housing 2, an input optical fiber 8, a plurality of receiving optical fibers 1, a concave reflecting mirror 5 and a mounting bracket; the receiving optical fiber 1 is an optical fiber sensitive to parachlorophenol, the rear section of the optical fiber sensitive to parachlorophenol is ground into a semicircular arc shape along the length direction, and the ground surface is coated with molecular engram polymer gel 3 sensitive to parachlorophenol;
The sensor housing 2 is cylindrical, the front part of the sensor housing 2 is a solid body, the rear part of the sensor housing 2 is a hollow body, and a liquid inlet notch is formed in the side wall of the hollow body; the center of the solid body is provided with an input optical fiber mounting hole along the axial direction, the outer side of the input optical fiber mounting hole is provided with a plurality of receiving optical fiber mounting holes, the rear ends of the input optical fibers 8 enter the hollow body at the rear part of the sensor housing 2 through the input optical fiber mounting holes, and the rear ends of all the receiving optical fibers enter the hollow body at the rear part of the sensor housing 2 through the receiving optical fiber mounting holes respectively;
The rear sides of the input optical fiber 8 and the receiving optical fiber 1 are provided with concave reflectors 5, the concave reflectors 5 are spaced from the tail ends of the input optical fiber 8 and the receiving optical fiber 1, and the concave reflectors 5 are wrapped by waterproof breathable films 4.
In a specific embodiment, the concave mirror 5 is fixed by a mounting bracket.
The mounting bracket comprises a mounting plate 10 and a fixing plate 6, wherein the fixing plate 6 is vertically connected to the side wall of the mounting plate 10, the concave reflector 5 is fixed on the inner end surface of the mounting plate 10, and the fixing plate 6 is fixed on the side wall of the sensor housing 2 through a fixing knob 7.
In a specific embodiment, the molecularly imprinted polymer gel is prepared by performing polymerization reaction on a mixed solution of template molecules, functional monomers, a cross-linking agent and an initiator to obtain a molecularly imprinted polymer, and preparing the molecularly imprinted polymer gel from the molecularly imprinted polymer.
The template molecule adopts p-chlorophenol, the functional monomer adopts methacrylic acid, acrylamide or methyl methacrylate and the like, and the crosslinking agent adopts ethylene glycol dimethacrylate and the like. The initiator adopts azodiisobutyronitrile or 3-chloropropyl trimethoxysilane and the like.
The working principle of the optical fiber sensor for selectively measuring the concentration of parachlorophenol provided by the invention is as follows: during testing, all receiving optical fibers 1 are connected with a spectrometer; firstly, light of a light source is transmitted through an input optical fiber 8 and passes through a waterproof breathable film 4 to the surface of a concave reflector 5, the light is reflected by the concave reflector 5 and transmitted into a plurality of surrounding receiving optical fibers 1, and is transmitted to a spectrometer through the receiving optical fibers 1 to collect spectrum data, the spectrum data transmitted by the receiving optical fibers 1 reflect the concentration of parachlorophenol in a measured solution, the spectrum data transmitted by different receiving optical fibers 1 are utilized to comprehensively average the concentration value of the parachlorophenol, and the influence of the external environment on measurement errors of a sensor is reduced. When the optical fiber sensor is inserted into the parachlorophenol solution to be detected, the parachlorophenol solution is contacted with the molecular imprinting polymer gel film coated on the ground surface of the receiving optical fiber 1 through the liquid inlet of the sensor housing 2, the molecular imprinting polymer gel film selectively adsorbs the parachlorophenol in the solution, so that the refractive index of the molecular imprinting polymer gel film is changed, the light transmitted in the receiving optical fiber 1 is changed, when the refractive index of the molecular imprinting polymer gel film is increased, the part of the light transmitted out of the optical fiber inside the receiving optical fiber 1 is increased, and the light transmitted into the spectrometer by the receiving optical fiber 1 is reduced in relative light intensity.
Example 2, see fig. 2, preparation of receiving fiber 1:
Step A, preparing a molecularly imprinted polymer:
A1, firstly, placing a proper amount of template molecule parachlorophenol and a functional monomer in 20mL of acetonitrile solution, and carrying out ultrasonic treatment for 30min to uniformly mix the template molecule parachlorophenol and the functional monomer; as the functional monomer, methacrylic acid, acrylamide, methyl methacrylate and the like can be used. Wherein the template molecule provides a template for the molecularly imprinted polymer, the functional monomer provides primarily, for example, hydrogen bond functionalities or reactive substituents for forming covalent bonds with the template molecule, and acetonitrile is a solvent for the template molecule and the functional monomer.
A2, dispersing the crosslinking agent ethylene glycol dimethacrylate and the initiator azodiisobutyronitrile into the mixed solution obtained in the step A to obtain a mixed solution of template molecules, functional monomers and the crosslinking agent; cooling the mixed solution of the template molecules, the functional monomers and the crosslinking agent in a water bath for 10min, and then purging with oxygen-free nitrogen and sealing; the initiator can be azobisisobutyronitrile, 3-chloropropyl trimethoxysilane, etc. The cross-linking agent is used for promoting or regulating covalent bond or ionic bond formation among polymer molecular chains, and the initiator is used for initiating cross-linking curing of the cross-linking agent and high polymer cross-linking reaction.
A3, placing the mixed solution obtained in the step A2 into a water bath kettle at 60 ℃ to react for 24 hours, and carrying out polymerization reaction to obtain a milky solid polymer after the reaction is finished;
A4, cleaning the obtained polymer by using a solution V Methanol :V Water and its preparation method =1:1, removing a template and unreacted functional group monomers, drying the polymer in a drying oven at 40 ℃ for 24 hours, and grinding the polymer for 2 hours to obtain a molecularly imprinted polymer;
and B, preparing a molecularly imprinted polymer gel:
An appropriate amount of polyether copolyamide PEBA2533, PEBA3533 or PEBA4033 was added to n-butanol and stirred continuously at 55rpm and 80 ℃ for 3 hours using a magnetic stirrer; adding the molecularly imprinted polymer obtained in the step A4, uniformly stirring, and then preserving in a refrigerator at a low temperature of 5 ℃ for 24 hours to eliminate trapped bubbles, thus obtaining molecularly imprinted polymer gel; wherein, the molecularly imprinted polymer taking parachlorophenol as a template molecule can selectively adsorb parachlorophenol, polyether copolyamide PEBA2533, PEBA3533 or PEBA4033 is taken as a thermoplastic elastomer, the thermoplastic elastomer can be dissolved in n-butyl alcohol with molecularly imprinted polymer powder by heating, and the molecularly imprinted polymer gel is prepared after cooling, and the n-butyl alcohol is taken as a solvent, so that polyether copolyamide PEBA2533, PEBA3533 or PEBA4033 and the molecularly imprinted polymer powder can be dissolved into a solution.
Preparation of a C, D type optical fiber: an optical fiber 11 is taken, the rear half section of the optical fiber 11 is ground into a semicircular arc shape along the length direction, namely, the upper part of the rear half section of the optical fiber is ground into a plane 12, and the grinding depth is smaller than half of the diameter of the optical fiber.
Step D, sensitive area coating:
d1, cleaning the optical fiber by using a solvent, and fixing the treated optical fiber in a polytetrafluoroethylene groove;
d2, placing the solid gel of the molecularly imprinted polymer obtained in the step B in a drying oven at 60 ℃ to heat to liquid gel, accurately measuring the coating amount of the gel of the molecularly imprinted polymer by using a pipette, and then coating the liquid gel on the ground surface of the optical fiber;
and D3, placing the optical fiber coated with the gel in a drying oven at 60 ℃, and removing the optical fiber from the polytetrafluoroethylene groove after the gel is formed into a film to obtain the D-shaped optical fiber sensitive to the selectivity of the parachlorophenol.
The molar ratio of template molecules, functional monomers, crosslinking agent and initiator in the step A2 is 1:3:6: 7.5-1:6:30: 7.5.
The molar ratio of template molecules, functional monomers and acetonitrile solution in the step A1 is 1:4:115-1:4:4784.
In the step B, the molar ratio of polyether copolyamide PEBA2533, PEBA3533 or PEBA4033 to the molecularly imprinted polymer is 10:1-2.5:1.
Example 3 to characterize the response performance of a fiber optic sensor for measuring parachlorophenol concentration based on the selectivity of molecularly imprinted polymer film, the real-time response of the fiber optic sensor to parachlorophenol concentration of 0-300 mg/L was tested, and the experimental results are shown in fig. 3.
As can be seen from fig. 3, the D-type optical fiber sensor coated with the molecularly imprinted polymer gel film is sensitive to the light intensity response of parachlorophenol solutions with different concentrations, and the relative light intensity of the optical fiber sensor decreases with the increase of the parachlorophenol concentration, because the refractive index of the molecularly imprinted polymer gel film increases after the molecularly imprinted polymer gel film adsorbs parachlorophenol in water, so that the light transmitted in the optical fiber is transmitted out of the molecularly imprinted polymer gel film to increase, and therefore, the higher the parachlorophenol concentration, the more parachlorophenol is adsorbed by the molecularly imprinted polymer gel film, the stronger the light penetrating through the molecularly imprinted polymer film, and the smaller the relative light intensity of the optical fiber.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (5)
1. An optical fiber sensor for selectively measuring the concentration of parachlorophenol comprises a sensor shell (2), an input optical fiber (8), a plurality of receiving optical fibers (1) and a concave reflecting mirror (5); the receiving optical fiber (1) is an optical fiber sensitive to parachlorophenol selectivity, the rear section of the optical fiber sensitive to parachlorophenol selectivity is ground into a semicircular arc shape along the length direction, and the ground surface is coated with molecular imprinting polymer gel sensitive to parachlorophenol selectivity;
The sensor housing (2) is cylindrical, the front part of the sensor housing (2) is a solid body, the rear part of the sensor housing (2) is a hollow body, and a liquid inlet notch is formed in the side wall of the hollow body; the center of the solid body is provided with an input optical fiber mounting hole along the axial direction, a plurality of receiving optical fiber mounting holes are arranged at the outer sides of the input optical fiber mounting holes, the rear ends of the input optical fibers (8) enter the hollow body of the sensor housing (2) through the input optical fiber mounting holes, and the rear ends of all the receiving optical fibers enter the hollow body of the sensor housing (2) through the receiving optical fiber mounting holes respectively;
A concave reflector (5) is arranged at the rear sides of the input optical fiber (8) and the receiving optical fiber (1), the concave reflector (5) is spaced from the tail ends of the input optical fiber (8) and the receiving optical fiber (1), and the concave reflector (5) is wrapped by a waterproof breathable film (4);
When the optical fiber sensor is inserted into the parachlorophenol solution to be detected, the parachlorophenol solution contacts with the molecular imprinting polymer gel membrane which is coated on the ground surface of the receiving optical fiber (1) and is sensitive to the parachlorophenol selectivity through the liquid inlet slot of the sensor housing (2), the molecular imprinting polymer gel membrane selectively adsorbs the parachlorophenol in the solution, the refractive index of the molecular imprinting polymer gel membrane is changed, and the light transmitted in the receiving optical fiber (1) is changed.
2. A fiber optic sensor for selectively determining parachlorophenol concentration according to claim 1, characterized in that the concave mirror (5) is fixed by a mounting bracket (6, 10).
3. The optical fiber sensor for selectively measuring parachlorophenol concentration according to claim 2, wherein the mounting bracket (6, 10) comprises a mounting plate and a fixing plate, the fixing plate (6) is vertically connected to the side wall of the mounting plate (10), the concave reflecting mirror (5) is fixed on the inner end surface of the mounting plate (10), and the fixing plate (6) is fixed on the side wall of the sensor housing (2) through a fixing knob (7).
4. The optical fiber sensor for selectively measuring the concentration of parachlorophenol according to claim 1, wherein the molecularly imprinted polymer gel is prepared by adopting a mixed solution of template molecules, functional monomers and a cross-linking agent to carry out polymerization reaction to obtain a molecularly imprinted polymer, and then preparing the molecularly imprinted polymer gel from the molecularly imprinted polymer.
5. The optical fiber sensor for selectively measuring the concentration of parachlorophenol according to claim 4, wherein the template molecule is parachlorophenol, the functional monomer is methacrylic acid, acrylamide or methyl methacrylate, and the crosslinking agent is ethylene glycol dimethacrylate.
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