阅读说明：本技术 一种基于木材的连翘碳量子点防腐剂的制备方法及其应用 (Preparation method and application of forsythia carbon quantum dot preservative based on wood ) 是由 王雅梅 赵晓琪 王磊 盛婧源 朱安明 任士明 胡政 王哲 于建芳 于 2020-07-08 设计创作，主要内容包括：本发明涉及木材防腐技术领域,尤其涉及一种基于木材的连翘碳量子点防腐剂的制备方法及其应用,包括以下步骤：S1、向锥形瓶内依次加入尿素、乙醇胺和连翘药液；S2、向混合液中加入超纯水,并经由超声分散机进行超声分散；S3、将装有超声分散的溶液的锥形瓶于微波中提取,从而制备得到连翘碳量子点；S4、将制备得到的连翘碳量子点溶于超纯水中,并进行离心处理；S5、将离心后的溶液静置并取出上清液,将上清液置于冷冻干燥机内冷冻干燥。本发明提出的防腐剂具有良好的抗真菌性能,可以应用于多种具有抗菌性能的中草药,弥补中草药抗流失性差的不足,且大大提高中草药本身的抗菌性能；且其制备方法工艺简单、易于操作,制备成本低,易于推广。(The invention relates to the technical field of wood preservation, in particular to a preparation method and application of a forsythia carbon quantum dot preservative based on wood, which comprises the following steps: s1, adding urea, ethanolamine and fructus forsythiae liquid medicine into the conical flask in sequence; s2, adding ultrapure water into the mixed solution, and performing ultrasonic dispersion by an ultrasonic dispersion machine; s3, extracting the conical flask filled with the ultrasonic dispersion solution in microwave to prepare fructus forsythiae carbon quantum dots; s4, dissolving the prepared fructus forsythiae carbon quantum dots in ultrapure water, and performing centrifugal treatment; and S5, standing the centrifuged solution, taking out a supernatant, and freeze-drying the supernatant in a freeze-dryer. The preservative provided by the invention has good antifungal performance, can be applied to various Chinese herbal medicines with antibacterial performance, makes up the defect of poor anti-leaching performance of the Chinese herbal medicines, and greatly improves the antibacterial performance of the Chinese herbal medicines; and the preparation method has the advantages of simple process, easy operation, low preparation cost and easy popularization.)

1. A preparation method of a forsythia carbon quantum dot preservative based on wood is characterized by comprising the following steps:

s1, adding urea, ethanolamine and fructus forsythiae liquid medicine into the conical flask in sequence;

s2, adding ultrapure water into the mixed solution, and performing ultrasonic dispersion by an ultrasonic dispersion machine;

s3, extracting the conical flask filled with the ultrasonic dispersion solution in microwave to prepare fructus forsythiae carbon quantum dots;

S4, dissolving the prepared fructus forsythiae carbon quantum dots in ultrapure water, and performing centrifugal treatment;

and S5, standing the centrifuged solution, taking out the supernatant, putting the supernatant into a freeze dryer for freeze drying, and further detecting the fluorescence intensity of the supernatant.

2. The preparation method of the wood-based forsythia carbon quantum dot preservative as claimed in claim 1, wherein the weight parts of the urea are 10-20, the weight parts of the ethanolamine are 2-5, the weight parts of the forsythia liquid is 15-30, and the weight parts of the ultrapure water are 200-400.

3. The preparation method of the wood-based fructus forsythiae carbon quantum dot preservative as claimed in claim 1, wherein the fructus forsythiae liquid medicine is extracted by the steps of grinding fructus forsythiae into powder, sieving with a 80-mesh sieve, weighing 18g of sieved fructus forsythiae powder, dissolving in 30ml of absolute ethyl alcohol, performing microwave extraction for 300W and 2min, repeating for 3 times, performing vacuum filtration on an extracting solution, and concentrating the concentration of the extracting solution to 1.8 g/ml.

4. The method as claimed in claim 1, wherein the microwave power is 500-1000W and the extraction time is 5-10min in step S3.

5. The preparation method of the wood-based forsythia carbon quantum dot preservative as claimed in claim 1, wherein the centrifugation rotation speed in the step S4 is 4000r/S, and the centrifugation time is 3-10 min.

6. The application of the wood-based forsythia carbon quantum dot preservative prepared by the method of claim 1 is characterized in that the preservative can be applied to various Chinese herbal medicines with antibacterial property, the defect of poor leaching resistance of the Chinese herbal medicines is overcome, the antibacterial property of the Chinese herbal medicines is improved, and the preservative effect of wood is improved better.

Technical Field

The invention relates to the technical field of wood preservation, in particular to a preparation method and application of a forsythia carbon quantum dot preservative based on wood.

Background

Wood is widely used as a renewable biological material, but wood is susceptible to environmental influences, microbial erosion and the like, so that the physical and chemical properties of wood are changed, such as: wood rotting and disintegration can be caused by wood rotting bacteria. Therefore, the timber is protected by reasonable antiseptic treatment, and the service life of the timber is prolonged. Traditional wood preservatives are for example: although ACQ, CCA and the like have good preservative effect on wood, the ACQ, CCA and the like have adverse effect on the environment, and through compendium of materia medica and literature investigation, effective components in Chinese herbal medicines have good inhibition effect on fungi, so the Chinese herbal medicines which do not affect the environment are supposed to be adopted as the wood preservative in the patent.

Although the Chinese herbal medicine as the wood preservative is green and environment-friendly and has obvious effect, certain defects exist, such as the fact that the effective antibacterial ingredients are not resistant to weather and are easy to inactivate, the preservative is wasted due to poor leaching resistance, the application amount is large, the cost is high, the attachment can be enhanced and the leaching resistance can be improved by preparing the Chinese herbal medicine into the nano particles, and meanwhile, the antibacterial property of the Chinese herbal medicine is expected to be improved.

The carbon quantum dots are carbon-based zero-dimensional materials, and have the advantages of excellent optical properties, good water solubility, low toxicity, environmental friendliness, wide raw material source, low cost, good biocompatibility and the like. The carbon quantum dots are composed of dispersed spheroidal carbon particles, have extremely small size (below about 10 nm), and are novel nano carbon materials with fluorescence properties. The proper size, low cost and good biocompatibility of the carbon quantum dots are crucial to the research in the fields of biomarkers and the like, so that the appearance of the carbon quantum dots attracts the wide attention of researchers, and therefore, a preparation method and application of a wood-based forsythia suspense carbon quantum dot preservative are provided.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a preparation method and application of a forsythia carbon quantum dot preservative based on wood.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a forsythia carbon quantum dot preservative based on wood comprises the following steps:

s1, adding urea, ethanolamine and fructus forsythiae liquid medicine into the conical flask in sequence;

s2, adding ultrapure water into the mixed solution, and performing ultrasonic dispersion by an ultrasonic dispersion machine;

S3, extracting the conical flask filled with the ultrasonic dispersion solution in microwave to prepare fructus forsythiae carbon quantum dots;

s4, dissolving the prepared fructus forsythiae carbon quantum dots in ultrapure water, and performing centrifugal treatment;

and S5, taking out the supernatant of the centrifuged solution, putting the supernatant into a freeze dryer for freeze drying, and further detecting the fluorescence intensity of the supernatant.

Preferably, the weight portion of the urea is 10-20 parts, the weight portion of the ethanolamine is 2-5 parts, the weight portion of the forsythia suspensa liquid medicine is 15-30 parts, and the weight portion of the ultrapure water is 200-400 parts.

Preferably, the extraction process of the forsythia suspense liquid medicine comprises the steps of grinding forsythia suspense into powder, sieving the powder by a sieve of 80 meshes, weighing 18g of sieved forsythia suspense powder, dissolving the powder in 30ml of absolute ethyl alcohol, performing microwave extraction for 300W and 2min, repeating the operation for 3 times, performing vacuum filtration on the obtained extract, and concentrating the concentration of the extract to 1.8 g/ml.

Preferably, the microwave power in step S3 is 500W, and the extraction time is 5 min.

Preferably, in the step S4, the centrifugal speed is 4000r/S, and the centrifugal time is 3 min.

The application of the forsythia carbon quantum dot preservative based on wood is that the forsythia carbon quantum dot preservative can be used for multiple Chinese herbal medicines with antibacterial performance, the defect of poor anti-leaching performance of the Chinese herbal medicines is overcome, the antibacterial performance of the Chinese herbal medicines is improved, and therefore the preservative effect of the wood is better improved.

The invention has the beneficial effects that:

1. the preservative provided by the invention has good antifungal performance, can be applied to various Chinese herbal medicines with antibacterial performance, makes up the defect of poor anti-leaching performance of the Chinese herbal medicines, and greatly improves the antibacterial performance of the Chinese herbal medicines;

2. the preparation method of the preservative provided by the invention is simple in process, easy to operate, low in preparation cost and easy to popularize.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.