Hydrothermal preparation method of carbon quantum dot used as visible light catalytic photosensitizer

Abstract

A hydrothermal preparation method of a carbon quantum dot used as a visible light catalytic photosensitizer is characterized by comprising the following steps: taking larches as raw materials; carrying out high-temperature high-pressure hydrothermal process treatment on the raw materials; centrifugally filtering and removing a dark brown solid product to obtain a light yellow liquid product; centrifuging the liquid product at high speed; controlling centrifugal rotation speed and centrifugal time; removing insoluble small particle impurities; carrying out dialysis by using a certain molecular weight of dialysis bag to remove unreacted sugars, salt contents and the like; then carrying out concentration to obtain a target product, namely a water-soluble fluorescent carbon quantum dot. The water-soluble fluorescent carbon quantum dot is compounded with TiO2 to prepare a photocatalytic composite system; by taking antibiotics as models, photocatalytic degradation performance of the composite system on the model and interaction efficiency of the carbon dot used as the photosensitizer are inspected. The operation process has the main characteristics that larches with rich resources in Heilongjiang province are used as raw materials; the raw materials are environment-friendly, are low in cost and are easy to get; hydrothermal reaction is low in temperature and low in pressure, addition of passivating agents such as acid, alkali and salt is not needed, the product is water-soluble and has a certain fluorescent effect, the reaction process is simple to operate, and the cost is low.

Description

Technical field: [0001] The invention relates to the field of preparation of nanomaterials, in particular to a hydrothermal preparation method for carbon quantum dots used as visible light catalyzed photosensitizers Background technique: [0002] Antibiotics are widely used in medical treatment, medical medicine and agricultural fields, but usually humans and animals have very low absorption capacity for antibiotics, and 50% to 80% of antibiotics are eventually excluded into the aquatic environment, causing soil toxicity, resistance Threats to human health, such as the production of antibiotics and pathogens, occur. Tetracycline is the second most used antibiotic in the world, so far there is still a lack of effective, comprehensive and systematic technical support for the removal of tetracycline. Compared with traditional adsorption and microbial degradation methods, photocatalytic degradation can effectively remove macromolecular organic components in aqueous solution, de...

AI Technical Summary

Problems solved by technology

[0002] Antibiotics are widely used in medical treatment, medical medicine and agricultural fields, but usually humans and animals have very low absorption capacity for antibiotics, and 50% to 80% of antibiotics are eventually excluded into the aquatic environment, causing soil toxicity, resistance Threats to human health, such as the production of antibiotics and pathogens, occur

Tetracycline is the second most used antibiotic in the world, so far there is still a lack of effective, comprehensive and systematic technical support for the removal of tetracycline

[0007] The Chinese patent whose publication number is CN102127431 introduces the preparation method of carbon quantum dots and the method of applying the quantum dots to prepare photocatalysts. In this method, ethanol and distilled water are mixed according to a certain volume ratio, and then an inorganic strong base is added to obtain an electrolyte and put into an electrolytic cell. Graphite carbon rods are used as electrodes, at 10-200mA / cm 2 The electrochemical reaction is carried out at a certain current density for 2 to 4 hours, and finally a desiccant is added to obtain carbon quantum dots through column chromatography separation. This method is performed in two steps, one electrolysis and one column chromatography separation, the reaction is complicated and the damage to the instrument is great.

[0008] In summary, the traditional methods of preparing carbon dots such as combustion, electrolysis, freeze-drying, and ultrasound are high-loss, complex reactions, and passivators such as strong acids and bases are required. Although some have excellent performance, they lack relevant practical application guidance.

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