The invention relates to a method for preparing biomass based carbon quantum dots. The method comprises the following steps: carbonizing or activating a biomass material so as to obtain a carbonized product of which the carbon content is greater than or equal to 80%, performing nano quantization on the carbonized product by using a thick acid mixing liquid so as to obtain water-soluble fluorescent carbon quantum dots, changing the reaction temperature so as to adjust the fluorescent color of the carbon quantum dots, and performing retaining separation by using a dialysis bag, thereby obtaining carbon quantum dots in a rectangular diamond cluster about 5nm. Compared with the prior art, the method is wide in raw material source based on natural biomass sources and green and environment-friendly. The chemical oxidation preparation process is simple, and preparation of small-size carbon quantum dots can be easily achieved. The carbon quantum dots are stable in fluorescent effect and good in water solubility, and can be used in fields such as biological imaging.

Method for preparing biomass based carbon quantum dots

The invention discloses a method for synthesizing fluorescence carbon dots with adjustable wave length in quantity and the carbon quantum dots prepared through the method, and relates to a preparation method of the carbon dots with higher synthesis fluorescence efficiency and mass yield and adjustable emission wavelength in a whole visible region by utilizing the same precursor as a carbon source. According to the preparation method for heat-treating the same carbon source by adopting different solvents and a fast precipitation purification method, the process is simple, high-efficient, green and environment-friendly, raw materials are cheap, and the reaction temperature is 160 to 250 DEG C. Each synthesized carbon quantum dot is formed by compounding a graphitized crystal lattice core and a layer of amorphous carbon shell, and has better solubility, stability and higher luminous efficiency in a common solvent; the diameter is gradually increased along with emission wavelength red shift and is 2 to 12nm. The synthesized carbon quantum dot as a novel luminescent material has the advantages of low production cost, high preparation yield, good light emitting stability low biotoxicity and favorable application prospect in application of photoelectric devices. The preparation method of the high-efficient near infrared fluorescence carbon dots brings convenience and chance for biological application of the carbon dots.

Method for synthesizing fluorescence carbon dots with adjustable wave length in quantity and carbon quantum dots prepared through method

The invention provides a sulfur doped carbon quantum dot with high fluorescent quantum yield, and a preparation method and application thereof. The invention respectively uses sodium citrate as a carbon source and sodium thiosulfate as a sulfur source, which are dissolved in a hydrothermal reaction kettle for reaction; the obtained product is naturally cooled and isolated to obtain a solution; after drying of the solution, the sulfur doped carbon quantum dot with high fluorescent quantum yield is obtained. The method only needs one step reaction, not only has low cost and high reaction speed, but also has a few by-products and intermediate products. The obtained carbon quantum dot has the characteristic of high fluorescent quantum yield, and can be successfully applied to the detection of Fe , and also has broad application prospects in biological detection and sewage disposal.

Sulfur doped carbon quantum dot with high fluorescent quantum yield, and preparation method and application thereof

The invention discloses a preparation method for carbon quantum dots obtained through phenylenediamine and folic acid. The preparation method comprises the steps that a quantum dot solution is prepared through a hydrothermal method; the quantum dot solution is separated through a silicagel column; quantum dots are obtained through rotary evaporation; after collection is completed, chromatography organic solvents in an obtained organic solution of the carbon quantum dots are removed through a rotary evaporation method; and a solution is prepared, solids are obtained after filtration and freeze drying, then, a 1% ethanol solution is added into the obtained solid products, insoluble substances in the solid products are removed through a filtration method, the obtained solution is frozen and dried, and finally the required phenylenediamine-folic acid carbon quantum dots are obtained. According to the preparation method, phenylenediamine and folic acid serve as the raw materials of the carbon quantum dots, the raw materials are simple and easy to get, the tumor cell optothermal treatment diagnosis and treatment carbon quantum dots are prepared with the hydrothermal method as a high-temperature carbonization method, operation is simple, and commercialization is easy to achieve.

Preparation method for carbon quantum dots obtained through phenylenediamine and folic acid

The invention relates to a carbon quantum dot fluorescence labeling material with orange peels used as a carbon source as well as a preparation method and an application of the carbon quantum dot fluorescence labeling material. The orange peels are used as a raw material, and a simple method for one-step synthesis of a high-fluorescence-quantum-efficiency carbon quantum dot is established. The method comprises steps as follows: the orange peels are mixed with water; then a mixed liquid is mixed with concentrated sulfuric acid; the pH is adjusted by the aid of NaOH, and undissolved residues are removed in a centrifugal manner; then dichloromethane is added to a centrifuged supernate, and a non-fluorescence fat-soluble substance is removed in the centrifugal manner; finally, the centrifuged supernate passes through a film, and the fluorescence labeling material is prepared. According to the method, high-temperature and high-pressure reactions are not required to be performed by equipment such as plasma emitters, hydrothermal reaction kettles, muffle furnaces and the like during synthesis, reaction conditions are mild, operations are simple and convenient, the cost is very low, the method can be implemented in ordinary laboratories, the synthesized fluorescence labeling material lays a foundation for the further application to work such as bio-labeling, heavy metal analysis, antibody labeling, cell staining and the like.

Carbon quantum dot fluorescence labeling material with orange peels used as carbon source as well as preparation method and application of carbon quantum dot fluorescence labeling material

The invention discloses a novel method for preparing red carbon quantum dots from bagasse as a carbon source raw material The preparation method comprises the step of heating bagasse and a mixed solution of phosphoric acid and sulfuric acid According to the invention, on one hand, since a waste biological resource bagasse is taken as a raw material, the recycling of the resource is achieved, on the other hand, the preparation process is simple and easily operated, and the prepared red carbon quantum dots have good optical properties and emit strong and stable red fluorescence under acidic conditions and have good absorption in the infrared and near infrared region and good light and heat effect Red carbon quantum dots prepared by the invention can be particularly used to prepare photothermal therapeutic drug besides the same application as other carbon quantum dots and have broad application prospects

Method for preparing red carbon quantum dots and application of red carbon quantum dots

The invention discloses a preparation method and application of molybdenum oxide nanoparticles used for targeted photo-thermal and photodynamic therapy. The nanoparticles are synthesized from hyaluronic acid, ammonium heptamolybdate and glucose through the one-step method. The method is easy and convenient to operate, and raw materials are low in price and easy to obtain. The prepared nanoparticles modified by hyaluronic acid have the advantages of being low in cell toxicity, good in biocompatibility and the like. Besides, the molybdenum oxide nanoparticles have good absorption in infrared and near-infrared areas, water solubility of the nanoparticles modified by hyaluronic acid is better, and photothermal conversion efficiency is good. The nanoparticles have photosensitization and can generate active oxygen under irradiation of infrared or near-infrared light. The prepared molybdenum oxide nanoparticles can be used for photo-thermal and photodynamic cancer treatment in a targeted mode, and have wide application prospects in the field of cancer treatment.

Preparation method and application of molybdenum oxide nanoparticles used for targeted photo-thermal and photodynamic therapy

The invention discloses a preparation method and application of metal-polyphenol nano-particles. The preparation method comprises the following steps: weighing a certain amount of tannic acid and a certain amount of ammonium metavanadate, separately dissolving the tannic acid and the ammonium metavanadate into distilled water, and uniformly stirring for subsequent use; heating an ammonium metavanadate solution, and stirring to obtain a golden yellow solution, namely a vanadium oxide solution; adding the vanadium oxide solution in a tannic acid solution, and heating and reacting to obtain a black solution; and carrying out dialysis to obtain the final product. The product has biodegradability, and the preparation method is a novel method for preparing the metal-polyphenol nano-particles forphotothermal therapy. The preparation method is simple and convenient to operate, and the raw materials are cheap and easily obtained. The metal-polyphenol nano-particles prepared by the method not only can be absorbed well in a near-infrared region like a traditional photothermal reagent and can be used for photothermal therapy of cancers, but also particularly has biodegradability, facilitatesinternal excretion, is not residual in a living body, and has wide application prospect.

Preparation method and application of metal-polyphenol nano-particles

The invention discloses a preparation method of glutathione-responsive Berlin green nanoparticles and an application thereof. During preparation, an aqueous solution of polyvinylpyrrolidone, potassiumhexacyanoferrate and ferric salt are subjected to one-step synthesis to obtain the glutathione-responsive Berlin green nanoparticles. The preparation method of the invention is simple and convenientto operate, and the raw material is safe and easy to obtain. The prepared Berlin green nanoparticles have small cytotoxicity, good biocompatibility and good dispersibility in the aqueous solution. Atthe same time, the nanoparticles display enhanced near-infrared region absorption under incubation of glutathione, have enhanced photothermal conversion efficiency. The Berlin green nanoparticles prepared by the invention can be used for glutathione-responsive enhanced photothermal and photodynamic therapy in the tumor microenvironment, and has broad application prospects in the field of cancer treatment.

Preparation method of glutathione-responsive Berlin green nanoparticles and application thereof

The invention discloses a preparation method and an application of a glutathione response vanadium oxide nano-particle. Ammonium metavanadate and hyaluronic acid are synthesized by a one-step method to obtain the nano-particle. The preparation method of the nano-particle is simple, raw materials are low in cost and easy to get, and the vanadium oxide nano-particle modified by the hyaluronic acid has the advantages that the nano-particle is good biocompatibility and has good dispersibility in water solution and the like. The nano-particle has good absorbing ability in a near infrared region after being incubated by glutathione, near-infrared light can be converted into heat energy, and the nano-particle can be used for photothermal therapy and has wide application prospects in the field ofphotothermal therapy for cancers.

Preparation method and application of glutathione response vanadium oxide nano-particle

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