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Method for preparing carbon quantum dots by taking activated sludge as raw material

A technology of activated sludge and carbon quantum dots, which is applied in chemical instruments and methods, nanotechnology for materials and surface science, nanocarbon and other directions, can solve problems such as insufficiency, eliminate environmental pollution problems, and simple preparation process Effect

Pending Publication Date: 2021-01-12
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The aqueous solution of carbon quantum dots prepared by the current disclosed method is usually transparent yellow, and the color gradually deepens as the concentration increases, and the solution usually appears under the irradiation of an ultraviolet lamp. It is blue and cannot meet the requirements of some experiments

Method used

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  • Method for preparing carbon quantum dots by taking activated sludge as raw material
  • Method for preparing carbon quantum dots by taking activated sludge as raw material
  • Method for preparing carbon quantum dots by taking activated sludge as raw material

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Embodiment 1

[0027] Embodiment 1: In this embodiment, a method for preparing carbon quantum dots using activated sludge as a raw material is to use activated sludge as a raw material, specifically through the following steps:

[0028] Step 1, adding oxalic acid to the activated sludge to adjust the pH value to 1;

[0029] Step 2: react at 130°C for 2 hours, and freeze-dry at -50°C for 24 hours to obtain carbon quantum dots.

[0030] The transmission electron microscope figure of the carbon quantum dot of the present embodiment sees figure 2 ,Depend on figure 2 It can be seen that the carbon quantum dots prepared from activated sludge are evenly distributed, and the size of the carbon quantum dots is 1-3 nanometers.

Embodiment 2

[0031] Embodiment 2: In this embodiment, a method for preparing carbon quantum dots using activated sludge as a raw material is to use activated sludge as a raw material, specifically through the following steps:

[0032] Step 1. Add 1g of hydrogen peroxide to the activated sludge, and add ammonia water to adjust the pH value to 8;

[0033] Step 2: react at 80°C for 3 hours, and freeze-dry at -50°C for 24 hours to obtain carbon quantum dots.

Embodiment 3

[0034] Embodiment 3: In this embodiment, a method for preparing carbon quantum dots using activated sludge as a raw material is to use activated sludge as a raw material, specifically through the following steps:

[0035] Step 1. Put the activated sludge into an ordinary oven for hydrothermal reaction, the reaction temperature is 90°C, the reaction time is 2 hours, and the pH value is adjusted to 2 by adding citric acid;

[0036] Step 2: react at 150°C for 2 hours, and freeze-dry at -50°C for 24 hours to obtain carbon quantum dots.

[0037] The transmission electron microscope figure of the carbon quantum dot of the present embodiment sees figure 1 ,Depend on figure 1 It can be seen that the carbon quantum dots prepared from activated sludge are evenly distributed, and the size of the carbon quantum dots is 1-3 nanometers.

[0038] The fluorescence spectrogram of the carbon quantum dot of the present embodiment sees image 3 , the prepared carbon quantum dots are green fluo...

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Abstract

The invention discloses a method for preparing carbon quantum dots by taking activated sludge as a raw material, and belongs to the field of preparation of carbon quantum dots. The method comprises the following steps: by taking the activated sludge as a raw material, adding acid into the raw material to adjust the pH value to 1-5, or adding alkali and an oxidant to adjust the pH value to 8-9; andreacting at 20-180 DEG C, and carrying out freeze drying to obtain the carbon quantum dots. The activated sludge can be pretreated by a hydrothermal method; one or a mixture of several of forestry and agricultural residues, kitchen garbage, grains and edible mushrooms can also be added into the activated sludge. The method is simple in process, environmentally friendly and harmless, and meanwhilethe problem of activated sludge environmental pollution is solved.

Description

technical field [0001] The invention belongs to the field of carbon quantum dot preparation; in particular, it relates to a method for preparing carbon quantum dots by using activated sludge as a raw material. Background technique [0002] As a green and non-toxic material, carbon quantum dots have been widely used in photocatalysis, sensors, bioimaging, drug synthesis, gene carriers and other fields. There are usually two methods for preparing carbon quantum dots from activated sludge: (1) top-down method: arc discharge method, laser ablation method, electrochemical method; (2) bottom-up method: hydrothermal method , template method, combustion method, ultrasonic method, microwave method. [0003] The aqueous solution of carbon quantum dots prepared by the currently disclosed method is usually transparent yellow, and the color gradually deepens as the concentration increases, and the solution usually appears blue under the irradiation of an ultraviolet lamp, which cannot m...

Claims

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Application Information

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IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y30/00
CPCC01B32/15C09K11/65B82Y20/00B82Y30/00
Inventor 史书杰
Owner NORTHEAST FORESTRY UNIVERSITY
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