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One-pot method for simultaneously preparing carbon quantum dots and porous carbon

A technology of carbon quantum dots and porous carbon, which is applied in the field of simultaneous preparation of carbon quantum dots and porous carbon in a one-pot method, can solve problems such as patent publications that have not yet been found, and achieve high-efficiency and high-value utilization, abundant resources, and good stability Effect

Active Publication Date: 2020-02-14
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, no patent publication related to the patent application of the present invention has been found

Method used

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  • One-pot method for simultaneously preparing carbon quantum dots and porous carbon
  • One-pot method for simultaneously preparing carbon quantum dots and porous carbon
  • One-pot method for simultaneously preparing carbon quantum dots and porous carbon

Examples

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Effect test

Embodiment 1

[0032] A method for simultaneously preparing carbon quantum dots and porous carbon in a one-pot method, the steps are as follows:

[0033] (1) Weigh 24g of corn cob lignin, disperse it in 120mL of deionized water, stir at 50°C for 10min, then transfer it to a high-temperature and high-pressure reactor, heat it to 180°C, keep it warm for 5h, the pressure is 1.1MPa, and the stirring speed is 200°C rev / min, the reaction ends, and the heating is stopped.

[0034] (2) Take the mixed liquid in step (1) out of the high-temperature and high-pressure reaction kettle, and filter it through a 0.22 μm circular filter membrane to obtain liquid and solid residues respectively, and dry the obtained solid residues at 105°C to constant weight ,spare. The resulting liquid was dialyzed with a 3500 Dalton semi-permeable membrane for 2 days (change the water once every 6 hours), and the carbon quantum dot solid doped with nitrogen was obtained by rotary evaporation and lyophilization.

[0035] (...

Embodiment 2

[0041] A method for simultaneously preparing carbon quantum dots and porous carbon in a one-pot method, the steps are as follows:

[0042] (1) Weigh 24g of corn cob lignin, add 12g of phosphoric acid, disperse in 120mL of deionized water, and stir at 50°C for 10min. Then transfer to a high-temperature and high-pressure reactor, heat to 180° C., keep warm for 5 hours, the pressure is 1.2 MPa, the stirring speed is 200 rpm, the reaction is over, and the heating is stopped.

[0043] (2) Take the mixed liquid in step (1) out of the high-temperature and high-pressure reaction kettle, filter it with a filter membrane of 0.22 μm, and obtain liquid and solid residues respectively. The obtained solid residues are transferred to a glass container and dried at 105°C To constant weight, set aside. The resulting liquid was dialyzed in deionized water for 2 days with a semipermeable membrane with a molecular weight cut-off of 3500D (change the water every 6 hours), and then obtained carbon...

Embodiment 3

[0050] A method for simultaneously preparing carbon quantum dots and porous carbon in a one-pot method, the steps are as follows:

[0051] (1) Weigh 24g of corncob lignin, add 12g of phosphoric acid, disperse in 120mL of deionized water, stir at 50°C for 10min, then transfer to a high temperature and high pressure reactor, heat to 180°C, hold for 5h, and the pressure is 1.2MPa , the stirring speed is 200 rpm, the reaction is over, and the heating is stopped.

[0052] (2) Take the mixed liquid in step (1) out of the high-temperature and high-pressure reaction kettle, and filter it with a filter membrane of 0.22 μm to obtain liquid and solid residues respectively. The obtained solid residues are transferred to a glass container and baked at 105°C Dry to constant weight and set aside. The resulting liquid was dialyzed in deionized water for 2 days with a semipermeable membrane with a molecular weight cut-off of 3500D (change the water every 6 hours), and then obtained carbon qua...

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Abstract

The invention relates to a one-pot method for simultaneously preparing carbon quantum dots and porous carbon. The method comprises the following steps: (1) weighing corncob lignin, adding phosphoric acid, adding deionized water until the corncob lignin is uniformly dispersed, transferring the mixture into a high-temperature high-pressure environment, keeping the temperature, stirring, and stoppingheating; (2) taking out the mixed solution, carrying out suction filtration to separate solid residues from the liquid, carrying out dialysis treatment on the obtained liquid, and carrying out rotaryevaporation and cold drying to obtain a nitrogen and phosphorus doped carbon quantum dot solid; and (3) carbonizing the collected solid residues in an inert gas atmosphere to obtain the porous carbondoped with nitrogen and phosphorus elements. According to the method, the carbon quantum dots with high fluorescence performance and the porous carbon material with large specific surface area and high conductivity are prepared by taking the corncob lignin as a raw material, the raw material is fully utilized, zero waste is realized, and the method has important significance for improving efficient and high-valued application of the lignin, solving energy crisis and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of combining biomass resource utilization and environmental protection, in particular to a method for simultaneously preparing carbon quantum dots and porous carbon in one pot. Background technique [0002] With the increasing shortage of fossil energy and the aggravation of environmental pollution, biomass resources are getting more and more attention because of their rich resources, green environmental protection, and renewable advantages. my country is a large agricultural country with huge crop yields, and agricultural waste has become a serious source of pollution. In fact, this underutilized resource hides a huge potential for development, and its rational use is in line with today's concept of sustainable development and maximizes the benefits of resources. [0003] Carbon quantum dots are a new generation of carbon-based fluorescent nanomaterials with excellent photoluminescence, low toxicity, and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C01B32/324C01B32/342C09K11/65B82Y20/00B82Y40/00B01J27/24H01G11/34H01G11/44H01G11/24
CPCC01B32/15C01B32/324C01B32/342C09K11/70B82Y20/00B82Y40/00B01J27/24H01G11/34H01G11/44H01G11/24Y02E60/13
Inventor 刘苇桑然然侯庆喜张励国
Owner TIANJIN UNIV OF SCI & TECH
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