Metal cyanide detection chip

Abstract

The utility model provides a metal cyanide detection chip, which comprises a support carrier, and a connection area and a detection area which are sequentially laid on the support carrier layer by layer, the detection area is provided with a plurality of gold nanoparticles, the surface of each gold nanoparticle is provided with a plurality of spiny bulges, and the metal cyanide detection chip is placed in a water sample to be detected, so that the detection accuracy of the metal cyanide detection chip is improved. A target nano-scale or micron-scale metal particle structure is generated in the connecting area, and the detection absorption wavelength and the detection absorbance of the generated target metal particle structure are obtained through spectrum equipment; and the type and the concentration of the metal cyanide can be confirmed by comparing the standard absorption wavelength and the standard absorbance corresponding to the target metal cyanide standard solution with the corresponding relation curve of the standard absorption wavelength and the standard absorbance and the concentration, the detection can be directly carried out after the sample to be detected is collected in the detection process, and the pretreatment operation on the detected sample is not needed; the detection efficiency of the metal cyanide in the wastewater is effectively improved.

Description

Technical Field

[0001] The present application belongs to the technical field of metal cyanide detection, and more specifically, relates to a metal cyanide detection chip. Background Art

[0002] During electroplating and metallurgical operations, the use or production of various metal cyanides is usually involved. Therefore, it is necessary to conduct metal cyanide testing on the wastewater generated during the above operations to evaluate whether the corresponding operation wastewater meets the emission standards.

[0003] Currently, metal cyanide is mainly detected in the laboratory through spectrophotometry. It mainly uses cyanide to undergo an oxidation reaction with sodium chlorate and potassium iodide under appropriate conditions to generate free cyanide ions, which then react with iron-containing compounds to form a blue complex (Prussian blue). Finally, the absorption spectrum of the blue complex is analyzed to achieve quantitative detection of metal cyanide. However, the above detection method requires pretreatment of the test sample during each detection process, such as sulfuric acid acidification and chloric acid oxidation treatment of the test sample, which makes the detection steps relatively cumbersome and time-consuming, thereby affecting detection efficiency. Utility Model Content

[0004] The purpose of this application is to provide a metal cyanide detection chip, which aims to solve the problem that when metal cyanide is currently detected by spectrophotometry, the test sample needs to be pre-treated during each detection process, resulting in the relevant detection steps being relatively cumbersome and time-consuming, thereby affecting the detection efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in this application is to provide a metal cyanide detection chip, including a support carrier, and a connection area and a detection area sequentially laid out layer by layer on the support carrier. The detection area has multiple gold nanoparticles, and the surface of the gold nanoparticles has multiple evenly distributed thorn-like protrusions.

[0006] In one embodiment, the gold nanoparticles have a particle size of 50-150 nm and a thickness of the detection area of ​​50-150 nm.

[0007] In one embodiment, the support carrier is a silica slide.

[0008] In one embodiment, the linker region comprises a plurality of organic molecules having amino or thiol groups at their ends.

[0009] In one embodiment, the connecting region comprises a plurality of 3-mercaptopropyltrimethoxysilane organic molecules or a plurality of 3-aminopropyltrimethoxysilane organic molecules.

[0010] The metal cyanide detection chip provided by the present application has the following beneficial effects: compared with the prior art, the metal cyanide detection chip includes a support carrier, and a connection area and a detection area sequentially laid layer by layer on the support carrier, wherein the detection area has a plurality of gold nanoparticles, and the surface of the gold nanoparticles has a plurality of thorn-like protrusions. By placing the metal cyanide detection chip in a water sample to be tested, the gold nanoparticles with the plurality of thorn-like protrusions form plasma hot electrons under a light environment, and then undergo a reduction reaction with the metal cyanide in the water sample to be tested, thereby generating target nano-scale or micro-scale metal particles in the connection area. The structure is obtained by using a spectral device to obtain the detection absorption wavelength and detection absorbance of the generated target metal particle structure, and the detection wavelength is compared with the standard absorption wavelength corresponding to the target metal cyanide standard solution to confirm the type of metal cyanide in the water sample to be tested. The detection absorbance is substituted into the standard absorbance and concentration correspondence curve corresponding to the target metal cyanide standard solution to confirm the metal cyanide concentration in the water sample to be tested. It can be seen that the above detection process can be directly carried out after the sample to be tested is collected, and there is no need to perform pre-treatment operations on the detection sample, which effectively improves the detection efficiency of metal cyanide in wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] Figure 1 Schematic diagram of a metal cyanide detection chip provided in one embodiment of the present application.

[0013] In the figure: 10, metal cyanide detection chip; 100, support carrier; 200, connection area; 300, detection area. DETAILED DESCRIPTION

[0014] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0015] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0016] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0018] In the field of plasmon hot electron induced chemical reactions in nanomaterials, plasma hot electrons in nanomaterials refer to the collective oscillation of free electrons on the surface of metal nanomaterials under light environment, forming localized surface plasmon resonance (LSPR). These high-energy electrons are the so-called "plasmonic hot electrons".

[0019] Specifically, when light shines on the surface of metal nanomaterials, the photon energy is transferred to the free electrons inside the metal nanoparticles, causing the electron energy to be far higher than the Fermi level of the corresponding metal. These excited high-energy electrons will temporarily be in a non-equilibrium state and become "plasma hot electrons". These plasma hot electrons can be further transferred to adjacent semiconductors or participate in chemical reactions with other substances. Therefore, they have important applications in photocatalysis, photodetectors and energy conversion. However, due to electron-electron scattering, electron-phonon interaction, interface loss and other reasons, plasma hot electrons are difficult to maintain a high-energy state for a long time, so their lifespan is short, and specific nanostructure design is required to make them easier to participate in chemical reactions.

[0020] See also Figure 1A metal cyanide detection chip 10 provided in one embodiment of the present application is now described. The metal cyanide detection chip 10 includes a support carrier 100, a connection region 200, and a detection region 300. The connection region 200 and the detection region 300 are sequentially laid layer by layer on the support carrier 100. The connection region 200 is located between the support carrier 100 and the detection region 300 and is used to fix the detection region 300 on the support carrier 100. The detection region 300 has a plurality of gold nanoparticles with directly exposed surfaces, and each gold nanoparticle has a plurality of evenly distributed thorn-like protrusions on its surface, thereby forming a gold nanostar (GNS) shape.

[0021] It should be noted that gold nanoparticles have a good reaction effect with metal cyanide, and the exposed surface of each gold nanoparticle (no surfactant) can reduce interfacial loss. In addition, each gold nanoparticle has more hot spots due to the multiple evenly distributed thorn-like protrusions on the surface, which can improve the generation efficiency of plasma hot electrons under light environment, thereby achieving rapid reaction with metal cyanide.

[0022] The metal cyanide detection chip 10 provided by the present application has the beneficial effect that, compared with the prior art, the metal cyanide detection chip 10 comprises a support carrier 100, and a connection area 200 and a detection area 300 sequentially laid layer by layer on the support carrier 100, wherein the detection area 300 has a plurality of gold nanoparticles, and the surface of the gold nanoparticles has a plurality of thorn-like protrusions. By placing the metal cyanide detection chip 10 in a water sample to be tested, the gold nanoparticles with the plurality of thorn-like protrusions form plasma hot electrons under a light environment and then undergo a reduction reaction with the metal cyanide in the water sample to be tested, thereby generating a target nano-scale or micron-scale metal particle structure on the connection area 200. The spectral equipment obtains the detection absorption wavelength and detection absorbance of the generated target metal particle structure, and compares the detection absorption wavelength with the standard absorption wavelength corresponding to the target metal cyanide standard solution to confirm the type of metal cyanide in the water sample to be tested. The detection absorbance is substituted into the standard absorbance and concentration correspondence curve corresponding to the target metal cyanide standard solution to confirm the metal cyanide concentration in the water sample to be tested. It can be seen that the above detection process can be directly carried out after the sample to be tested is collected, and there is no need to perform pre-treatment operations on the test sample, which effectively improves the detection efficiency of metal cyanide in wastewater. In particular, for some occasions where only qualitative detection is required, rapid screening of metal cyanide can be carried out on-site.

[0023] It should be noted that the above-mentioned target metal cyanide standard solution can be configured in advance. Specifically: standard solutions of known concentrations of various target metal cyanides are prepared in advance, which are usually required to include at least 5 standard points with different concentrations, and the concentrations in this series are all lower than 1 ppm. Then, the metal cyanide detection chip 10 is placed in the target metal cyanide standard solutions of different known concentrations. After the reaction occurs, each metal cyanide detection chip 10 is taken out and the absorption wavelength of the target metal particles on each metal cyanide detection chip 10 and the absorbance of the target metal particles with different contents are obtained through a spectroscopic device, thereby obtaining the corresponding standard absorption wavelength of the target metal cyanide standard solution and the corresponding standard absorbance and concentration curve of the target metal cyanide standard solution (absorbance is the horizontal axis, and the concentration of the target metal cyanide standard solution is the vertical axis, which is usually a straight line and conforms to the Lambert-Beer law).

[0024] Furthermore, in this embodiment, the gold nanoparticles have a particle size of 50-150 nm, the detection region 300 has a thickness of 50-150 nm, the support carrier 100 is a silica wafer, and the connection region 200 has a plurality of organic molecules containing amino or thiol groups at their terminals. The organic molecules containing amino or thiol groups at their terminals have good connection properties with the gold nanoparticles and silica. In some specific embodiments, the silica wafer has hydroxyl functional groups after surface activation, and the connection region 200 has a plurality of 3-mercaptopropyltrimethoxysilane organic molecules, or a plurality of 3-aminopropyltrimethoxysilane organic molecules.

[0025] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A metal cyanide detection chip, characterized in that: It includes a supporting carrier, and a connecting area and a detection area laid layer by layer on the supporting carrier. The detection area has a plurality of gold nanoparticles, and the surface of the gold nanoparticles has a plurality of evenly distributed thorn-like protrusions.

2. The metal cyanide detection chip according to claim 1, characterized in that: The particle size of the gold nanoparticles is 50-150 nm, and the thickness of the detection area is 50-150 nm.

3. The metal cyanide detection chip according to claim 1, characterized in that: The supporting carrier is a silicon dioxide carrier.

4. The metal cyanide detection chip according to claim 3, characterized in that: The linking region has a plurality of organic molecules having amino groups or thiol groups at their terminals.

5. The metal cyanide detection chip according to claim 4, characterized in that: The connecting region comprises a plurality of 3-mercaptopropyltrimethoxysilane organic molecules or a plurality of 3-aminopropyltrimethoxysilane organic molecules.

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