45 results about "Mercuric ion" patented technology

The invention discloses a mercury ion detection fluorescent probe based on quinoline as well as a preparation method and application of the mercury ion detection fluorescent probe. The fluorescent probe and a structural formula of the fluorescent probe are shown as a formula I in the specification. A quinoline derivative, namely 2-methyl-7-hydroxyquinoline, is used as a fluorescent chromophore, a thioester group is used as a recognition group, and the prepared fluorescent probe shows high sensitivity and high selectivity on Hg < 2 + > in a solution. The preparation method of the fluorescent probe is simple in steps, raw materials are easy to obtain, and the obtained product is a white flocculent solid, is easy to store, has a wide application prospect and can be produced and applied on a large scale.

The present application mainly relates to a kind of preparation of sulfur-rich amino acid protein CMd-copper nanoclusters and its detection mercury ion method, comprising: a) by prokaryotic expression obtains CMd protein, and the protein concentration of 5 mg / mL-25 mg / mL CMd protein solution is obtained by purification.b) CMd is reacted with reducing agent TCEP after opening protein disulfide bond.c) the protein solution after reduction is reacted with anhydrous copper sulfate, and preparation high fluorescence CMd-copper nanocluster.d) CMd-copper nanocluster is applied to detect heavy metal mercury ion.The application method can be synthesized under mild aqueous conditions by "one-step method" structure controllable, stable CMd-copper nanocluster, widens the raw material of copper nanocluster synthesized with protein as template, avoids the use of organic solvent and strong reducing agent, and reduces the cost and environmental burden brought by noble metal raw material, and also has higher selectivity to mercury ion.

The application belongs to the technical field of contaminated soil remediation, and particularly relates to modified montmorillonite for synergistically remediating heavy metals and organic pollutants in soil as well as a preparation method and application thereof. Hexadecyl trimethyl ammonium bromide (CTAB) and dodecyl trimethyl ammonium bromide (DTAB) are used as modifiers to prepare organic modified montmorillonite, and mercury ions (Hg 2+ ) and acetochlor (ACR) are used as representative substances of heavy metals and organic pollutants to study the effects of the two kinds of organic modified montmorillonite on remediation of Hg 2+ and ACR compound contaminated soil. The results show that the two kinds of organic modified montmorillonite have good removal effects on Hg 2+ and ACR in real soil samples, and can simultaneously remove Hg 2+ and ACR in soil. The removal rates of CTAB modified montmorillonite and DTAB modified montmorillonite can both reach more than 90%. The organic modified montmorillonite prepared by using CTAB and DTAB as modifiers can simultaneously remove Hg 2+ and ACR in soil, and can synergistically remediate Hg 2+ and ACR compound contaminated soil.

The invention discloses an Hg < 2 + > detection method for enhancing Hg < 2 + > intrinsic laccase-like activity based on ZIF-8-Au. The invention finds that the mercury ions have laccase-like activity, the enzyme activity of the mercury ions is obviously enhanced under the action of ZIF-8-Au, and the color of the reaction catalyzed by the mercury ions is obviously changed along with the increase of the concentration of Hg < 2 + >, so that a colorimetric analysis method for detecting the mercury ions is developed on the basis, the Turn-On type visual analysis is realized, and the application prospect is wide. The method realizes simple, rapid, sensitive and high-selectivity detection of Hg < 2 + > residues in water and food. The invention provides a new method and principle for the fields of Hg < 2 + > environment monitoring and food safety, and provides a new direction for the development of a heavy metal ion detection technology.

This invention belongs to the field of wastewater treatment in metal mines and proposes a coupled method for removing ultra-low concentration mercury from metal mine wastewater. It employs a combined process of "coupled chemical precipitation + flocculation precipitation + sulfur-loaded activated carbon adsorption." First, stannous chloride is added to generate a hydroxide gel, which is then chemically precipitated in conjunction with amorphous FeS nanoparticles. Next, hydrophobically modified cationic polyacrylamide is used for flocculation precipitation. Finally, modified sulfur-loaded activated carbon is used for deep adsorption. This treatment process has a specific removal effect on mercury ions, and the final effluent mercury meets the Class II surface water standard, with stable effluent quality. It also solves the problem of sulfur loss from ordinary sulfur-loaded activated carbon.

The application aims to provide an application of a ratio fluorescent probe based on gold nanoclusters / long afterglow nanorods in mercury ion detection, and belongs to the technical field of fluorescent detection, which comprises synthesis of gold nanoclusters, preparation of long afterglow nanorods, and preparation and application of the ratio fluorescent probe. The ratio fluorescent probe comprises red light emitting gold nanoclusters and green light emitting long afterglow nanorods, and the fluorescent emission of the two materials has obvious spectral and color distinction. The responses of the gold nanoclusters and the long afterglow nanorods to mercury ions are completely opposite, mercury ions can quench the luminescence of the gold nanoclusters, while the luminescence of the long afterglow nanorods is enhanced to a certain extent. The response difference of the two fluorescent signals to different concentrations of mercury ions is utilized, and the ratio processing of the fluorescent intensity can be used for ratio fluorescent detection of mercury ions, and obvious composite fluorescent color change can be observed under the same excitation light irradiation, which is convenient for visual analysis of mercury ions.

The invention discloses an intrinsic micropore degradable polymer material based on biomass and hetero-calixarene and a preparation method and application thereof.The method comprises the steps that firstly, cyanuric chloride and resorcinol serve as raw materials, and oxygen atom bridged hetero-calixarene macrocyclic molecules are synthesized in one step under the alkaline condition through a one-pot method; then introducing the lignin derivative into oxygen atom bridged hetero calixarene by utilizing an aromatic nucleophilic substitution reaction on a triazine ring in a macrocyclic molecule, and carrying out a condensation reaction on the obtained multi-aldehyde functionalized oxygen atom bridged hetero calixarene and polyfunctional mercaptan under an acidic condition to obtain the target degradable polymer material. When in use, the material is directly put into an aqueous solution of elemental iodine, iodine negative ions and divalent mercury ions for adsorption. The removal rate of the material to low-concentration iodine simple substances, iodine negative ions and divalent mercury ions can reach 90% or above, and the material after adsorption can be repeatedly used after being washed by an acidic aqueous solution. The material can be degraded under an alkaline condition.

The invention relates to a mercury-containing acid mud efficient recovery method and device based on difference frequency resonance coupling. The high-efficiency mercury-containing acid mud recovery method based on difference frequency resonance coupling comprises the following steps: step 1, acid mud pretreatment: crushing, screening and drying mercury-containing acid mud; 2, coupled field leaching is conducted, specifically, a product in the step 1 is conveyed into a reaction kettle, stirring is conducted after an oxidizing agent is added, an acid mud turbid liquid is obtained, an oxidation-reduction reaction is conducted through catalysis of a difference frequency resonance coupled field formed by two frequency-adjustable ultrasonic waves, and the difference frequency adjusting range delta f is 6-10 kHz; step 3, carrying out solid-liquid separation; leaching liquid containing mercury and selenium is obtained. According to the scheme provided by the invention, the standing wave effect can be formed through the difference frequency, and the crushing efficiency of the cavitation bubbles is improved, so that the oxidation reaction speed of the mercury-containing acid mud turbid liquid is improved; secondly, through the adjustable frequency, the situation that the ultrasonic frequency is not matched with the mercury ion concentration and the turbid liquid temperature, and consequently ultrasonic energy waste is caused is avoided.

The invention relates to a cyano-stilbene mercury ion fluorescent probe compound and a preparation method thereof. The molecular structure of the compound is shown in the specification.

The application discloses a pyrrole ring-containing boron-sulfur doped fused ring aromatic hydrocarbon and a synthesis method and application thereof, and relates to a pyrrole ring-containing boron-sulfur doped fused ring aromatic hydrocarbon which is synthesized from simple raw materials such as 2,6-difluoronitrobenzene through a Clauson-Kaas pyrrole synthesis reaction and an electrophilic boronation reaction. Property research involves ultraviolet, fluorescence and CV tests, and mercury ion tests. The application has the characteristics of a short reaction path, a simple operation method and mild reaction conditions, and the compound has the potential of application in the field of photoelectric devices and can also be applied to mercury ion identification.

The invention relates to the technical field of chemical hazardous substance detection, in particular to a Tb-CeMOF (at) ATP fluorescent probe as well as a preparation method and application thereof. The fluorescent probe is obtained by taking a terbium / cerium bimetal organic framework Tb-CeMOF as a matrix and an aptamer as a recognition element and modifying the Tb-CeMOF framework with the aptamer through synthesis. The detection mechanism is as follows: when mercury does not exist, the aptamer enables the characteristic fluorescence of terbium to be excited. When a target object exists, the aptamer is specifically combined with mercury, and conformational change causes change of an energy transfer path: the characteristic fluorescence of terbium is quenched; characteristic fluorescence of cerium is obviously enhanced, and an'on-off-on 'type ratio fluorescence signal is formed. A standard curve is established by monitoring the linear relation between the ratio change of the fluorescence intensity and the mercury ion concentration, and accurate quantification of the mercury ion residual quantity in the sample is achieved. By means of simple operation and excellent sensitivity and selectivity, a reliable and efficient new strategy is provided for trace detection of mercury ions.

This invention provides a highly selective and sensitive fluorescent probe for mercury ions, its preparation method, and its applications, belonging to the fields of chemical sensing materials and environmental monitoring technology. This invention connects 4-(1,2,2-triphenylvinyl)phenol, which exhibits aggregation-induced emission, and a guanosine derivative with multiple coordination sites, via a flexible chain to obtain a fluorescent probe with the structure shown in Formula I. This fluorescent probe not only overcomes the problems of large differences in solubility and reactivity between 4-(1,2,2-triphenylvinyl)phenol and guanosine derivatives, making coupling difficult, but also possesses high sensitivity and selectivity; its detection limit reaches 12.24 nM, effectively detecting trace mercury pollution in samples. It can also accurately identify mercury ions in water samples containing multiple high concentrations of metal ions, demonstrating high accuracy in real water samples. It is suitable for the accurate determination of mercury ions in complex environmental water samples and has good practical application value in the field of environmental monitoring. Formula I

The invention provides a multifunctional nano material Ni-MoS2 (at) Au for detecting trace toxic substances in mushrooms and a preparation method of the multifunctional nano material Ni-MoS2 (at) Au. The nano material is prepared from a metal oxide, a surfactant, precious metal nano particles and a solvent, the nano material has colorimetric and Raman detection functions on various trace toxic substances (mercury ions and amanita peptide) in mushrooms, hydrogen peroxide is immediately catalyzed to quickly oxidize 3, 3 ', 5, 5'-tetramethyl benzidine into yellow 3, 3 ', 5, 5'-tetra (tetrafluoromethyl) phenyl diamine oxide after the nano material is in contact with a target object Hg < 2 + > for 1s in a colorimetric mode, the nano material has an extremely low detection limit of 0.036 mu g / mL, and the nano material can be used for detecting various trace toxic substances (mercury ions and amanita peptide) in mushrooms. The catalyst has good selectivity and is not interfered by other heavy metal ions; in a Raman mode, high-sensitivity detection of alpha-amanita peptide and beta-amanita peptide can be realized, and the detection limit ranges are 10 <-4 > M to 10 <-8 > M. The nano material provides a reference mode capable of detecting multiple target objects in the same system, and opens up a new way for a detection strategy of trace toxic substances in the field of food safety detection.

The invention relates to the field of heavy metal ion detection, in particular to a preparation method and application of a mercury ion colorimetric and ratiometric fluorescent probe based on carbazole. The preparation method of the colorimetric and ratiometric fluorescent probe comprises the following step: carrying out reaction on O-(4-(bromomethyl) phenyl) diphenyl selenophosphonate and (E)-9-ethyl-3-(2-(quinoline-4-yl) vinyl)-9H-carbazole in acetonitrile to generate (E)-1-(4-((diphenyl selenophosphoryloxy) benzyl)-4-(2-(9-ethyl-9H-carbazole-3-yl) vinyl) quinoline bromide. The fluorescent probe has the advantages of simple synthesis route, strong operability, easily available raw materials and low cost, can realize rapid detection of mercury ions by using colorimetric and change of the ratio F528nm / F648nm of fluorescence intensities at two different emission wavelengths, and has the advantages of large Stokes shift, high sensitivity, good selectivity and the like.

This invention provides an application of a naphthalenepyridone fluorescent probe in the detection of mercury, iron, and iodide ions, belonging to the field of fluorescence analysis technology. Different metal cations were added to the CH3CN / H2O solution containing the fluorescent probe, and it was found that only Hg was detected. 2+ This can enhance the fluorescence of the fluorescent probe, while Fe... 3+ The addition of [a specific ingredient] can quench the fluorescence of the fluorescent probe. Furthermore, [the following is an example of a specific ingredient]: A3-Hg. 2+ When different anions were added to a CH3CN / H2O solution containing Ion, it was found that only Ion... ‑ The addition of A3-Hg can make 2+ The fluorescence is weakened, therefore this fluorescent probe can recognize Fe with high sensitivity and high selectivity. 3+ Hg 2+ and I ‑ In addition, this fluorescent probe can also be used to treat Hg in traditional Chinese medicine. 2+ Quantitative detection.

The application discloses a mercury ion detection method and device and a preparation method of a nano-gold Raman enhancer, and is used for improving the detection accuracy of heavy metal mercury ions. The mercury ion detection method comprises the following steps: preparing a nano-gold Raman enhancer by using a chloroauric acid solution, a sodium citrate solution and a thiuram solution; adding the nano-gold Raman enhancer into a mercury ion reference solution; performing Raman spectrum detection on the mixture to generate a spectrum graph; determining a target characteristic peak from the spectrum graph as a discrimination basis for enhancing Raman scattering spectrum detection of mercury ions, and determining that the mercury ion concentration and the intensity of the characteristic peak are in a positive correlation relationship, the mercury ion reference solution is a solution with a known mercury ion concentration; adding the nano-gold Raman enhancer into a sample solution to be detected; performing Raman spectrum detection on the mixture, and calculating the mercury ion concentration in the sample solution to be detected according to the peak area of the known characteristic peak.

The invention provides a preparation method of a phenylboronic acid functionalized silicon quantum dot fluorescent probe and application of the phenylboronic acid functionalized silicon quantum dot fluorescent probe in detection of mercury ions and methyl mercury ions, and relates to the technical field of detection of heavy metal mercury ions and methyl mercury ions. In the presence of mercury ions (Hg < 2 + >) and methyl mercury ions (CH3Hg < + >), silicon point fluorescence is quenched. By combining ultraviolet portable equipment and combining a silicon puncture-Hg < 2 + > and silicon puncture-CH3Hg < + > system with RGB value acquisition and conversion of a smart phone platform, rapid and high-sensitivity detection of mercury ions and methyl mercury ions in an environmental water body is realized. The detection method disclosed by the invention has the advantages of simplicity and convenience in operation, rapid feedback, high sensitivity, good repeatability, high stability, strong accuracy and the like, can intuitively realize rapid determination of mercury ions and methyl mercury ions in a water sample in real time, and widens the application direction of silicon dots in the aspect of environmental detection.

The application relates to a mercury ion ratio fluorescent probe based on a hemicyanine and preparation and application of the fluorescent probe, the fluorescent probe has a molecular formula of C 26 H 23 INOPS; the preparation of the fluorescent probe comprises the following steps: (1) 4-hydroxybenzaldehyde is reacted with diphenylthiophosphonic dichloride to obtain O-(4-formylphenyl)diphenylthiophosphonate, i.e. compound 3, (2) 4-methylpyridine is reacted with methyl iodide to obtain 1,4-dimethylpyridine iodide, i.e. compound 2, (3) compound 3 is reacted with compound 2 to obtain a mercury ion ratio fluorescent probe 4-(4-(diphenylthiophosphonate)styryl)-1-methylpyridine iodide, i.e. compound 1; the application of the fluorescent probe is that the fluorescent probe is reacted with mercury ions in a buffer solution, and the existence of the mercury ions is detected by using the ratio (F 504nm / F 450nm ) change of the fluorescence intensity at two different emission wavelengths. The probe preparation process of the application is simple, and the fluorescent probe molecule exhibits high selectivity and sensitivity in a coexisting system of mercury ions and other cations.

This invention discloses an application of CsPbBr3@SiO2 perovskite quantum dots, belonging to the field of water quality detection technology. Multiple ligands are added during the synthesis of quantum dots. After synthesizing perovskite quantum dots using a hot-injection method, the quantum dots are collected by centrifugation and washed with a mixed solvent of n-hexane and ethyl acetate to remove some of the ligands on the surface of the quantum dots. Finally, the silicon-containing ligands on the surface of the quantum dots are hydrolyzed, forming a thin, discontinuous shell layer on the surface of the quantum dots. This perovskite quantum dot core-shell structure exhibits good water stability while also possessing porosity that allows contact with relevant metal ions, causing fluorescence quenching of the quantum dots. The perovskite quantum dot core-shell structure prepared by this invention can efficiently detect copper or mercury ions with minimal influence from other ions. The method proposed in this invention can effectively suppress the hydrolysis of quantum dots in water, which is of great significance for the synthesis of quantum dots and their application in water quality detection.

The application discloses a kind of self-microporous degradable polymer materials based on biomass and calixarene and its preparation method and application, the method first with cyanuric chloride and resorcinol as raw material, adopt "one-pot method" under alkaline conditions one-step synthesis oxygen atom bridging calixarene macrocyclic molecule, then using the aromatic nucleophilic substitution reaction that occurs in triazine ring in macrocyclic molecule, lignin derivative is introduced into oxygen atom bridging calixarene, the condensation reaction that the obtained polyaldehyde group functionalized oxygen atom bridging calixarene occurs with polyfunctionality mercaptan under acidic conditions, obtain target degradable polymer material.Directly when using, the material is placed into iodine element, iodine negative ion, divalent mercury ion aqueous solution and is adsorbed.The removal rate of the material to low concentration iodine element, iodine negative ion, divalent mercury ion can reach more than 90%, and the material after adsorption can be washed with acidic aqueous solution and reused.Under alkaline conditions, the material can be degraded.

The present application relates to a kind of fluorescent probe for detecting mercury ion and its preparation method and application, belong to fluorescent probe detection technical field.The fluorescent probe for detecting mercury ion of the present application contains benzothiazole unit and mercapto group, the fluorescent probe for detecting mercury ion of the present application under the action of mercury ion, mercapto group will hydrolyze into aldehyde, to cause the change of fluorescence property.Meanwhile, the fluorescent probe for detecting mercury ion of the present application has extremely strong selectivity and specificity when detecting mercury ion, has important significance in chemical analysis detection.

The invention relates to a method for treating mercury-containing wastewater by adopting ion exchange. The method comprises the following steps: (1) adding a NaHCO3 solution and sodium sulfide into the mercury-containing wastewater; (2) effluent in the step (1) enters a first-stage sulfydryl cation exchange fiber column, and saturated sulfydryl cation exchange fibers are sequentially subjected to backwashing, regeneration and leaching; (3) effluent in the step (2) enters a secondary carboxyl type amphoteric ion exchange fiber column, and saturated amphoteric ion exchange fibers are sequentially subjected to backwashing, regeneration and leaching; and (4) the effluent in the step (3) enters a three-stage mixed ion exchange resin column, saturated ion exchange resin is sequentially subjected to backwashing, regeneration and leaching, and the effluent is discharged after reaching the standard. By adopting a chemical precipitation and multi-stage ion exchange coupling method, the method has a good removal effect on mercury ions in various valence states, the mercury content in the treated wastewater reaches the national discharge standard, and the method has the characteristics of stable treatment effect, economy and high efficiency.

The invention discloses a bimodal sensor as well as a preparation method and application thereof. The bimodal sensor comprises Fe3O4 (at) TCPP, wherein the surface of the Fe3O4 (at) TCPP is modified with a mercury ion aptamer; the Fe3O4 (at) TCPP comprises Fe3O4 and tetra (4-carboxyphenyl) porphin, and the tetra (4-carboxyphenyl) porphin is coated on the surface of the Fe3O4. The nanoprobe has low cost and good anti-interference and selectivity, can realize specific recognition of mercury ions in food, further realizes fluorescence / colorimetric spectrum bimodal detection result output, achieves the purpose of self-correction detection, and improves the selectivity, accuracy and efficiency of detection.

The invention discloses a fluorescent probe NX601 based on 1, 8-naphthalimide and application of the fluorescent probe NX601 in detection of mercury ions (Hg < 2 + >). The probe can be specifically combined with Hg < 2 + >, triggers a remarkable fluorescence enhancement effect, has the characteristics of low detection limit (18.95 nM), fast response (within 5 seconds), strong anti-interference (not influenced by common metal ions such as Cu < 2 + >), high stability, good water solubility and the like, and is suitable for efficient detection of mercury ions in an aqueous solution. In addition, a detection cotton swab, a spray bottle and an intelligent mobile phone analysis platform are developed in a matched mode, and on-site rapid detection of Hg < 2 + > is supported. The whole system is simple and convenient to operate, and can be widely applied to field detection requirements in the fields of environmental monitoring, food security inspection and the like.

This invention relates to the field of heavy metal ion detection and environmental remediation technology, specifically to a two-dimensional covalent organic polymer, its preparation method, and its applications. This addresses the existing Hg... 2+ The existing detection methods suffer from insufficient sensitivity, complex operation, poor selectivity of adsorbent materials, and difficulty in simultaneously achieving identification and removal. The method of this invention involves placing 2,4-diamino-1,4-benzenedithiol dihydrochloride, 1,3,5-tris(tetra-formylphenyl)benzene, 1,4-dioxane, mesitylene, and an aqueous solution of acetic acid in a high-pressure reactor. The raw materials are then ultrasonically dispersed to a uniform state. The reactor is then placed in an oven for static reaction. After the reaction, the reactor is cooled to room temperature, filtered, washed with acetone, and dried to obtain a two-dimensional organic polymer containing a benzothiazole structure. The two-dimensional covalent organic polymer prepared by this invention exhibits high sensitivity (36 nM) and a rapid response time (90 s) for the detection and adsorption of mercury ions in environmental water.

The invention belongs to the technical field of nano materials, and particularly relates to a method for detecting mercury ions by using mercury ion (Hg < 2 + >) triggered tellurium-based nano material oxidase and a kit thereof. According to the method, an amphiphilic substance with multiple functional groups and / or a hydrophobic structural domain is used as a functional soft template, and the Hg < 2 + > trigger type nano tellurium oxidase with high stability and catalytic activity is prepared; based on a Hg < 2 + > triggering-catalytic activation mechanism, the nano enzyme can realize integration of double functions of recognition and signal amplification, a color development reaction is triggered by utilizing specific binding of Hg < 2 + > and Te, a high-sensitivity signal opening detection mode is formed, and compared with a traditional signal inhibition type method, the nano enzyme has a more remarkable visual distinguishing effect, and the detection sensitivity is high. Quantitative and qualitative analysis of Hg < 2 + > by naked eyes or instruments can be realized through intuitive color deepening change, and the fluorescent probe can be integrated in a portable kit and is suitable for on-site rapid detection of Hg < 2 + > in various water environments.

The application discloses a method for realizing synchronous detection of mercury ions and lead ions based on a non-labeled DNA biosensor and a DNA probe thereof. The method has the advantages of sensitivity, simple operation and low cost. In the detection range, the concentrations of the two ions and the fluorescence signals are in good linear relationship. The application has good specificity for the two ions, and various metal ions such as potassium, copper, nickel, magnesium and calcium have no interference effect on the detection. The detection limits of the mercury ions and the lead ions are 4.094 nM and 3.22 nM respectively, and the whole detection process can be completed at room temperature. The result can be directly obtained through a fluorescence spectrophotometer. The test of the actual tap water sample has been completed, the detection process is convenient and fast, and the method can be used for detecting the mercury ions and the lead ions in actual water bodies.

The invention provides a chemically modified electrode for detecting mercury ions and an electrochemical detection method thereof, and belongs to the technical field of heavy metal residue detection. A nitrogen-doped porous longan carbon material (NPCs) is used as a carrier, an NPCs-loaded ferroferric oxide nanoparticle (Fe3O4NPs (at) NPCs) composite material is prepared through a solvothermal method, the surface of a silk-screen printing carbon electrode (SPCE) is coated with the NPCs-loaded ferroferric oxide nanoparticle (Fe3O4NPs (at) NPCs) composite material, Fe3O4NPs (at) NPCs / SPCE is obtained, then gold nanoparticles (AuNPs) are modified through an electro-deposition method, an AuNPs / Fe3O4NPs (at) NPCs / SPCE modified electrode is prepared, and the AuNPs / Fe3O4NPs (at) NPCs / SPCE modified electrode is used as a negative electrode. And an electrochemical rapid detection method for detecting mercury ions in aquatic products based on the modified electrode is established. The modified electrode provided by the invention is good in stability and high in test sensitivity, and has good application potential in the field of rapid detection of Hg (II) in aquatic products.

This invention relates to the field of chemical analysis and detection technology, specifically to a reactive fluorescent probe for mercury ions and / or silver ions, its preparation method, and its application. The fluorescent probe has the structure shown in formula (I). The fluorescent probe of this invention can simultaneously and selectively detect mercury ions and silver ions in a dual-channel manner. It can detect mercury ions in solution, aggregated state, and solid state, and exhibits excellent selectivity and anti-interference ability. After reacting with mercury ions and adding water to form an aggregated state, the fluorescence enhancement increases by 486 times, accompanied by a change in fluorescence color from dark to bright yellow-green.

The invention relates to the technical field of fluorescence sensing and food safety detection, in particular to a carbon quantum dot for mercury ion fluorescence detection and a preparation method and application thereof.According to the method, 2, 3-diaminopyridine serves as a C source and an N source, boric acid serves as a boron source, and N and B synergistically doped carbon quantum dots are synthesized in one step through a microwave method; a fluorescence sensing system with specific recognition capability on Hg < 2 + > is constructed, compared with traditional blue light carbon quantum dots, the carbon quantum dot has the emission wavelength of 425-520 nm, belongs to a long wavelength region, has the linear range of 0-25 [mu] mol / L, and can meet the detection requirements of trace-to-trace Hg < 2 + >; the detection limit of mercury ions (Hg < 2 + >) is as low as 32.8 nmol / L, which is far lower than the allowable concentration of Hg < 2 + > in food specified in food safety standards, and the problems of low sensitivity and poor stability of Hg < 2 + > detection based on carbon quantum dots in the prior art are solved.