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Method for preparing carbon nano particles and carbon dots by using activated carbon as precursor

A technology of carbon nano-particles and activated carbon, applied in the direction of nano-carbon, chemical instruments and methods, carbon compounds, etc., can solve the problems of poor universality of activated carbon, large loss of activated carbon, and reduced adsorption capacity, etc., and achieve social and economic benefits Obvious, strong functional design, and the effect of increasing added value

Inactive Publication Date: 2018-11-30
MIANYANG HONGQI NEW MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional regeneration technology has the following disadvantages: ①The loss of activated carbon is relatively large; ②The adsorption capacity will decrease significantly after regeneration; ③The tail gas generated during regeneration will cause secondary pollution
However, the new regeneration technology either requires high equipment, or is not universally applicable to activated carbon, or has high energy consumption and low regeneration efficiency, and most of them are in the laboratory stage.
More importantly, no matter which existing regeneration technology is used, activated carbon will lose its adsorption performance after repeated regeneration

Method used

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  • Method for preparing carbon nano particles and carbon dots by using activated carbon as precursor
  • Method for preparing carbon nano particles and carbon dots by using activated carbon as precursor
  • Method for preparing carbon nano particles and carbon dots by using activated carbon as precursor

Examples

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Embodiment 1

[0032] A method for preparing carbon nanoparticles and carbon dots with activated carbon as a precursor, comprising the following steps:

[0033] a, take (collect) the deactivated coal-based activated carbon with a particle size of about 3 mm used in sewage purification in chemical and chemical plants, without cleaning, directly place it in a blast drying oven at 120 ° C for 2 hours;

[0034] b. Using a ball mill to grind the above-mentioned activated carbon particles to a powder with a particle size distribution of 40-60 nm;

[0035] c, the preparation mass percentage concentration is the nitric acid aqueous solution of 31%, 5 mass parts of powdered gacs are added to 200 mass parts of nitric acid aqueous solution and stir at room temperature for 10 hours, then be warming up to 120 ℃ of constant temperature reaction 48 hours, obtain the material after reaction; After the material was left to stand for 12 hours, the supernatant part of the extraction was the crude product conta...

Embodiment 2

[0040] A method for preparing carbon nanoparticles and carbon dots with activated carbon as a precursor, comprising the following steps:

[0041] a. Take (collect) the deactivated husk-based activated carbon with a diameter of about 0.6-2 mm that has been used for drinking water treatment, and directly place it in a blast drying oven at 105 ° C for 6 hours without cleaning;

[0042] b. Using a ball mill to grind the above-mentioned activated carbon particles to a powder with a particle size distribution of 20-40nm;

[0043] c, the preparation mass percentage concentration is the nitric acid aqueous solution of 31%, 5 mass parts of powdered gacs are added to 200 mass parts of nitric acid aqueous solution and stir at room temperature for 8 hours, then be warming up to 120 ℃ of constant temperature reaction 48 hours, obtain the material after reaction; After the material was left to stand for 12 hours, the supernatant part of the extraction was the crude product containing carbon...

Embodiment 3

[0048] A method for preparing carbon nanoparticles and carbon dots with activated carbon as a precursor, comprising the following steps:

[0049] a, take (collect) the sulfur-containing powdered activated carbon that has been used for the treatment of oil refinery wastewater, and directly place it in a blast drying oven at 105° C. for 6 hours without cleaning;

[0050] b. Using a ball mill to grind the above-mentioned activated carbon particles to a powder with a particle size distribution of 20-40nm;

[0051] c, the preparation mass percentage concentration is the nitric acid aqueous solution of 31%, 5 mass parts of powdered gacs are added to 200 mass parts of nitric acid aqueous solution and stir at room temperature for 8 hours, then be warming up to 120 ℃ of constant temperature reaction 48 hours, obtain the material after reaction; After the material was left to stand for 12 hours, the supernatant part of the extraction was the crude product containing carbon nanoparticles...

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Abstract

The invention discloses a method for preparing carbon nano particles and carbon dots by using activated carbon as a precursor. The method is characterized by comprising the following steps: taking theactivated carbon, performing drying, and performing grinding to obtain powder; adding the powdery activated carbon into an oxide aqueous solution, performing stirring at room temperature, performingheating to temperature of 30-130 DEG C, and performing a reaction for 12-48 h; allowing the obtained material to stand, extracting the supernatant part, adding deionized water, performing concentration for 5-10 times, and performing dialysis by using a dialysis membrane with 100-500 D; mixing an aqueous solution containing the carbon nano particles and a compound containing amino or other functional groups by using deionized water as a medium, performing heating, and performing a heat induction reaction to obtain a crude product of carbon nano particles with a modified surface containing an organic passivation layer; and performing post-treatment to obtain the carbon dots. According to the method disclosed by the invention, the prepared carbon nano particles can be used for functional fillers such as conductive materials, nucleating agents, nano carriers and the like, and the prepared carbon dots can be used as a fluorescent marker, a sensing or detecting probe, and a photocatalyst andused in photoelectric conversion devices such as LEDs.

Description

technical field [0001] The invention belongs to the recovery and reuse of solid (industrial) waste activated carbon, and relates to a preparation method of carbon nanoparticles and carbon dots with activated carbon as a precursor. The carbon nanoparticle prepared by the present invention can be used for conductive and other functional fillers, nucleating agents, nanocarriers, etc., and its surface is easily modified by various compounds, and has strong functional design; the carbon dots prepared by the present invention can be used as fluorescent markers Photoelectric conversion devices such as objects, sensing or detection probes, photocatalysts and LEDs, etc. Background technique [0002] Activated carbon is a kind of amorphous carbon, which is widely used in various fields such as air purification and water treatment because of its large specific surface area and strong adsorption capacity. However, activated carbon has the problem of deactivation after adsorption satura...

Claims

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Application Information

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IPC IPC(8): C01B32/15C01B32/36B01J20/20B01J20/28B01J20/30
CPCB01J20/205B01J20/28007B01J20/28016B01J20/3021B01J20/3085C01B32/15C01B32/36
Inventor 任先艳曾学良汪学军曾尔华王龕
Owner MIANYANG HONGQI NEW MATERIAL SCI & TECH
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