Method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater

A technology of carbon quantum dots and waste water, which is applied in the field of carbon quantum dot preparation, can solve problems such as difficulty in meeting recycled water standards, waste of resources and energy, and difficulty in meeting discharge standards, so as to reduce the pressure of sewage discharge, low cost, and small investment Effect

Active Publication Date: 2019-06-14
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater
  • Method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater
  • Method for preparing multicolor fluorescent carbon quantum dots through tobacco wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A method for preparing multicolor fluorescent carbon quantum dots with tobacco waste water, the specific steps are as follows:

[0037] (1) Take 300 mL of tobacco waste water in a beaker, place it on a heating platform, raise the temperature to 300 °C at a constant speed, and heat at a constant temperature of 300 °C for 3 h until the organic matter is dehydrated, carbonized, and discolored to obtain the reaction product A;

[0038] (2) After the reaction product A in step (1) is cooled to room temperature, add modifier ethanol to the reaction product A and mix evenly to obtain a mixed solution B;

[0039] (3) Stir the mixed solution B in step (2) with magnetic force for 10 min, and then ultrasonically treat it for 5 min. Blue fluorescent carbon quantum dots; wherein the rotational speed of centrifugation is 12000 r / min, and the centrifugation time is 30 min; the volume ratio of modifying agent ethanol to reaction product C is 10:1;

[0040] The surface morphology of ca...

Embodiment 2

[0044] On the basis of Example 1, the modifying agent was replaced by deionized water, and other conditions remained unchanged; green fluorescent carbon quantum dots dispersed in deionized water could be obtained.

Embodiment 3

[0046] On the basis of Example 1, the modifying agent was replaced by oxalic acid solution, the concentration of oxalic acid solution was 1.8 g / L, and other conditions remained unchanged; yellow fluorescent carbon quantum dots dispersed in oxalic acid solution could be obtained.

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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...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65
Inventor 唐菊张晋李文丽孔繁泉张维佐宋佩烜
Owner YUNNAN UNIV
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