CN-118325608-B - Vinasse carbon quantum dot and preparation method and application thereof

Abstract

The invention discloses a distillers' grain carbon quantum dot and a preparation method and application thereof. A preparation method of the distillers ' grains carbon quantum dots comprises the following steps of centrifuging distillers ' grains to remove supernatant to obtain solid matters, adding a solvent into the solid matters to prepare a mixture, heating the mixture in a reaction kettle after ultrasonic treatment, and filtering the mixture after reaction to obtain the distillers ' grains carbon quantum dots. The distillers 'grains are used as waste materials of commercial products, are low in cost and easy to obtain, and are high in safety, and the distillers' grains are used as food waste materials with rich carbon sources to form quantum dots under the hydrothermal reaction condition, so that the cost for preparing the quantum dots is reduced, and the quantum dots with high fluorescence intensity can be formed. By utilizing the fluorescence quenching effect of Fe 3+ and the distillers' grain carbon quantum dots, the analysis and detection of the concentration of Fe 3+ in soy sauce are realized, the detection cost is reduced, and the energy conservation and the environmental protection are realized.

Inventors

• HE DONG
• XIANG YUJUAN
• YU HONGPENG
• WU KEGANG

Assignees

• 广东工业大学

Dates

Publication Date

20260508

Application Date

20240412

Claims (5)

1. 1. The application of the distillers 'grain carbon quantum dots in iron ion detection is characterized in that the preparation method of the distillers' grain carbon quantum dots comprises the following steps: centrifuging the vinasse to remove supernatant liquid to obtain solid matters, adding a solvent into the solid matters to prepare a mixture, heating the mixture in a reaction kettle after ultrasonic treatment, and filtering the mixture after reaction to obtain the vinasse carbon quantum dots, wherein the solvent is deionized water, the vinasse is yellow wine vinasse, and the heating temperature in the reaction kettle is 120-240 ℃ and the heating time is 2-16h.
2. 2. Use according to claim 1, characterized in that the concentration of the mixture is 3-15wt%.
3. 3. A test strip for detecting iron ions is characterized in that the test strip is cellulose filter paper, the cellulose filter paper is loaded with carbon quantum dots, and the carbon quantum dots are vinasse carbon quanta according to claim 1 or 2.
4. 4. A method for preparing a test strip for detecting ferric ions as claimed in claim 3, comprising the steps of cutting cellulose filter paper according to a required size, immersing in a solution of distillers' grains carbon quantum dots, taking out, and drying at room temperature.
5. 5. The method of claim 4, wherein the cellulose filter paper is soaked in the distillers' grains carbon quantum dot solution for 4-6min.

Description

Vinasse carbon quantum dot and preparation method and application thereof Technical Field The invention relates to the field of carbon quantum dots, in particular to a distillers' grains carbon quantum dot and a preparation method and application thereof. Background The carbon quantum dots have excellent light stability and also have the advantages of environmental protection, low toxicity and the like, so that the carbon quantum dots are paid attention to by mass researchers. However, the application of carbon quantum dots to the food industry has a higher requirement for its safety. Food waste is a substance rich in carbon sources but easily ignored, and therefore, efficient utilization of food waste is an important subject of current research. Currently, the detection technology of iron ions mainly includes atomic absorption spectrometry, ion chromatography, spectrophotometry, liquid chromatography and the like. However, these methods have common disadvantages, such as complicated instrument use, complicated sample preparation procedure, high cost, and the like, which limit their application in real scenes, and therefore, developing a method for rapidly, sensitively, and inexpensively detecting iron ions has great significance for practical application. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a distillers' grain carbon quantum dot and a preparation method and application thereof. According to the invention, vinasse is used as a raw material, and vinasse carbon quantum dots are synthesized by a hydrothermal method, so that Fe 3+ is detected. The prepared carbon quantum dot emits blue fluorescence, and after Fe 3+ is added, dynamic fluorescence quenching is generated. Based on the method, the carbon quantum dots are loaded on the filter paper strip and used for portable detection of Fe 3+, and meanwhile, the carbon quantum dots are also used for detecting the iron content in the iron-fortified soy sauce. The distillers 'grain carbon quantum dot is adopted as a fluorescent probe and has the advantages that (1) compared with the reported fluorescent probe, the probe has a quite LOD and a relatively wider linear range, (2) the probe is synthesized by industrial food waste and is more environment-friendly and safer than a probe synthesized or doped by chemicals as raw materials, and (3) the distillers' grain carbon quantum dot is firstly used as the probe for Fe 3+ detection, so that the application of the food waste in detection is widened. Therefore, the distillers' grain carbon quantum dots have wide application prospect. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention provides a preparation method of a distillers' grain carbon quantum dot, which comprises the following steps: centrifuging the vinasse to remove supernatant to obtain a solid, adding a solvent into the solid to prepare a mixture, heating the mixture in a reaction kettle after ultrasonic treatment, and filtering the mixture after reaction to obtain the vinasse carbon quantum dots. Preferably, the solvent is deionized water. Preferably, the concentration of the mixture is 3-15wt%. Preferably, the heating temperature in the reaction kettle is 120-240 ℃ and the heating time is 2-16h. Preferably, the distiller's grains are yellow wine distiller's grains. The invention provides a distillers 'grain carbon quantum dot, which is prepared by the preparation method of the distillers' grain carbon quantum dot. The third aspect of the invention provides application of the distillers' grains carbon quanta in iron ion detection. The fourth aspect of the invention provides a test strip for detecting iron ions, which is cellulose filter paper, wherein the cellulose filter paper is loaded with carbon quantum dots, and the carbon quantum dots are vinasse carbon quanta. The fifth aspect of the invention provides a method for preparing the test strip for detecting iron ions, which comprises the steps of cutting cellulose filter paper according to a required size, soaking the cellulose filter paper in a vinasse carbon quantum dot solution, taking out the cellulose filter paper and drying the cellulose filter paper at room temperature. Preferably, the cellulose filter paper is sized 5cm by 1cm after cutting. Preferably, the cellulose filter paper is soaked in the distillers' grains carbon quantum dot solution for 4-6min. Compared with the prior art, the invention has the beneficial effects that: The distillers 'grains are used as waste materials of commercial products, are low in cost and easy to obtain, and are high in safety, and the distillers' grains are used as food waste materials with rich carbon sources to form quantum dots under the hydrothermal reaction condition, so that the cost for preparing the quantum dots is reduced, and the quantum dots with high fluorescence intensity can be formed. By utilizing the fluorescence quenching effec