Method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater

Abstract

The invention discloses a method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater and belongs to the technical field of carbon quantum dot preparation. The method comprises the steps that the tobacco wastewater is heated up to 200-300 DEG C at the constant speed, a heating reaction is conducted for 1-3 h within the temperature range of 200-300 DEG C till organicmatter is dehydrated, carbonized and discolored, and thus a reaction product A is obtained; after the reaction product A is cooled to the room temperature, a modifier is added into the reaction product A, and even mixing is conducted to obtain a mixed solution B; and the mixed solution B is stirred for 5-10 min, then ultrasonic treatment is conducted for 5-10 min, after still standing is conducted, supernatant is taken to be centrifuged, then still standing is conducted, supernatant is taken, and thus the multicolor fluorescent carbon quantum dots dispersed into a modifier are obtained. The tobacco wastewater are adopted as a carbon source, the carbon quantum dots are prepared through a simple pyrolytic reaction and dispersed by adopting ethyl alcohol, deionized water, oxalic acid and a sodium hydroxide solution as the modifier correspondingly, and the fluorescence emission wavelength of the carbon quantum dots can be regulated from a blue light area to a yellow light area.

Description

technical field [0001] The invention relates to a method for preparing multicolor fluorescent carbon quantum dots by using tobacco wastewater, and belongs to the technical field of carbon quantum dot preparation. Background technique [0002] Carbon quantum dots are a new type of zero-dimensional carbon nanomaterials with a size less than 20 nm, which have superior fluorescence characteristics and unique chemical, electronic and optical properties. Compared with traditional dye molecules and semiconductor quantum dots, carbon quantum dots have the advantages of high chemical stability, low cytotoxicity, biocompatibility, unique electronic and optical properties, and resistance to metabolic degradation. Therefore, carbon quantum dots can be widely used as advanced fluorescent materials in many fields such as optoelectronic devices, energy conversion, photocatalysis, sensors, bioimaging, cell labeling, and drug delivery. The related research and application have quickly becom...

AI Technical Summary

Problems solved by technology

According to tests, the chemical oxygen demand (COD) of tobacco wastewater is as high as 11000-13000mg / L, and the temperature of the wastewater is 45-70°C, which contains a lot of heat. If it is discharged directly without treatment, it will not only cause waste of resources and energy, but also cause severe environmental pollution

In addition, due to the stable and complex structure of the substances contained in tobacco wastewater, it is difficult to use the usual anaerobic biochemical treatment of industrial wastewater. It is not only difficult to meet the discharge standards, but also difficult to meet the standards for recycled water

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