Preparation method of ammonia gas responsive color-changing complex material and application thereof

Abstract

The application belongs to the technical field of functional materials, and relates to a preparation method of an ammonia-responsive color-changing complex material and application thereof. The ammonia-responsive color-changing complex material prepared by the application has excellent antibacterial performance, ammonia-responsive color-changing performance and ultraviolet absorption performance, and has the advantages of simple preparation process, environmental protection, low cost and suitability for large-scale production, and has a wide application prospect in the fields of gas sensing, biological medicine, food packaging, intelligent materials, ammonia detection, environmental monitoring and safety, etc.

Description

Technical Field

[0001] This invention belongs to the field of functional materials technology, specifically relating to a method for preparing ammonia-responsive color-changing complex material and its application. Background Technology

[0002] Coordination compounds, or simply coordination compounds, are hybrid materials with infinitely extended spatial structures formed by metal ions linked to organic ligands through coordinate bonds. Due to their combination of characteristics of both organic and inorganic materials, coordination compounds possess excellent physical and chemical properties. Progress has been made in many fields, including drug release, gas adsorption and storage, magnetism, fluorescence recognition and detection, and selective catalysis, and their synthesis and potential applications have become a research hotspot. There are many types of organic bridging ligands for coordination compounds, with common examples including cyanides, pyridines, pyrimidines, phosphoric acids, sulfonic acids, and carboxylic acids. Notably, coordination compound materials with multiple functions (such as antibacterial properties, ammonia responsiveness, and ultraviolet absorption) have broad application prospects in gas sensing, biomedicine, food packaging, smart materials, ammonia detection, and environmental safety. Therefore, developing simple and economical methods to prepare multifunctional (e.g., antibacterial, ammonia responsive, and ultraviolet absorption) coordination compound materials is of significant practical importance. Summary of the Invention

[0003] Based on the above background, this invention provides a method for preparing an ammonia-responsive color-changing complex material and its application. The ammonia-responsive color-changing complex material provided by this invention exhibits excellent antibacterial properties, ammonia-responsive properties, and ultraviolet absorption properties. Furthermore, the preparation process is simple, environmentally friendly, and low-cost, and suitable for large-scale production.

[0004] Technical solution of the present invention:

[0005] A method for preparing an ammonia-responsive color-changing complex material includes the following steps:

[0006] (1) Add 14.71 parts of L-glutamic acid to 500 parts of formic acid and stir at room temperature for 30 min to obtain a homogeneous L-glutamic acid solution for later use;

[0007] (2) Add 27 parts of ferric chloride hexahydrate to 2000 parts of ethanol and stir for 30 minutes at room temperature to obtain a homogeneous ferric chloride solution for later use;

[0008] (3) The L-glutamic acid solution obtained in step (1) is added to the ferric chloride solution obtained in step (2), and the mixture is stirred at 90°C for 12 hours. Then, the mixture is centrifuged, washed, and freeze-dried to obtain a complex material with ammonia-responsive color change.

[0009] The application of the ammonia-responsive color-changing complex material prepared by the above method is characterized by its use in food packaging, smart materials, ammonia detection, environmental monitoring and safety, and other fields.

[0010] The beneficial effects of this invention are as follows:

[0011] The ammonia-responsive color-changing complex material prepared by this invention has excellent antibacterial properties, ammonia-responsive properties, and ultraviolet absorption properties. Moreover, the preparation process is simple, environmentally friendly, and low-cost, and it is suitable for large-scale production. It has broad application prospects in food packaging, smart materials, ammonia detection, environmental monitoring and safety, and other fields. Attached Figure Description

[0012] Figure 1 The infrared spectrum of the complex material prepared in the embodiments of the present invention;

[0013] Figure 2 The ultraviolet-visible spectrum of the ethanol dispersion of the complex material prepared in the embodiments of the present invention;

[0014] Figure 3 Photographs of the inhibition zone antibacterial activity of the complex material prepared in this embodiment of the invention against Escherichia coli;

[0015] Figure 4 Photographs of the inhibition zone antibacterial activity of the complex material prepared for embodiments of the present invention against Staphylococcus aureus. Detailed Implementation

[0016] The present invention will be specifically described below through embodiments. It should be noted that these embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments based on the above description of the present invention. Unless otherwise specified, the parts of raw materials mentioned are all parts by mass.

[0017] In a specific embodiment, L-glutamic acid was a product provided by Sinopharm Chemical Reagent Co., Ltd.; ferric chloride hexahydrate was an analytical grade reagent provided by Xilong Chemical Co., Ltd.; formic acid was an analytical grade reagent provided by Xilong Chemical Co., Ltd.; and ethanol was an analytical grade reagent provided by Tianjin Fuyu Fine Chemical Co., Ltd.

[0018] Example:

[0019] A method for preparing an ammonia-responsive color-changing complex material includes the following steps:

[0020] (1) Add 14.71 parts of L-glutamic acid to 500 parts of formic acid and stir at room temperature for 30 min to obtain a homogeneous L-glutamic acid solution for later use;

[0021] (2) Add 27 parts of ferric chloride hexahydrate to 2000 parts of ethanol and stir for 30 minutes at room temperature to obtain a homogeneous ferric chloride solution for later use;

[0022] (3) The L-glutamic acid solution obtained in step (1) is added to the ferric chloride solution obtained in step (2), and the mixture is stirred at 90°C for 12 hours. Then, the mixture is centrifuged, washed, and freeze-dried to obtain a complex material with ammonia-responsive color change.

[0023] The ammonia-responsive color-changing complex material prepared in the embodiments of the present invention is reddish-brown in color. After being exposed to an ammonia environment, its color rapidly turns yellow, indicating that the complex material has excellent ammonia-responsive color-changing properties.

[0024] The UV-Vis properties of the materials were evaluated using a UV-Vis spectrometer (Lamdba365, Platinum Elmer Instruments). Figure 2 The image shows the UV-Vis spectrum of the ethanol dispersion of the complex material prepared in an embodiment of the present invention. The results indicate that the complex material has significant UV absorption properties.

[0025] The antibacterial properties of the material were evaluated using the inhibition zone antibacterial activity test method; the ammonia-responsive color-changing complex material prepared in the embodiments of the present invention produced obvious inhibition zones against Escherichia coli and Staphylococcus aureus (see Figure 3 and Figure 4 This indicates that the complex material has excellent antibacterial effects.

[0026] In summary, the ammonia-responsive color-changing complex material prepared by this invention has excellent antibacterial properties, ammonia-responsive color-changing properties, and ultraviolet absorption properties. Moreover, the preparation process is simple, environmentally friendly, and low-cost, and it is suitable for large-scale production. It has broad application prospects in fields such as gas sensing, biomedicine, food packaging, smart materials, ammonia detection, environmental monitoring, and safety.

[0027] The content of this invention is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solutions of this invention by reading this specification are covered by the claims of this invention.

Claims

1. The application of an ammonia-responsive color-changing complex material in ammonia detection, characterized in that, The preparation method of the ammonia-responsive color-changing complex material includes the following steps: (1) Add 14.71 parts of L-glutamic acid to 500 parts of formic acid and stir at room temperature for 30 min to obtain a homogeneous L-glutamic acid solution for later use; (2) Add 27 parts of ferric chloride hexahydrate to 2000 parts of ethanol and stir for 30 minutes at room temperature to obtain a homogeneous ferric chloride solution for later use; (3) The L-glutamic acid solution obtained in step (1) is added to the ferric chloride solution obtained in step (2), and the mixture is stirred at 90°C for 12 hours. Then, the mixture is centrifuged, washed, and freeze-dried to obtain a complex material with ammonia-responsive color change.

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