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A kind of amine functionalized graphene quantum dots and its preparation and application

A technology with amine-based functions and quantum dots, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of easy discharge of harmful gases, high consumption of electricity and metal electrodes, and high cost of wastewater treatment. Simple and convenient production method, good removal effect and low cost

Active Publication Date: 2017-10-27
泉州市福达科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical precipitation method is usually to add chemical agents to the wastewater, so that the heavy metal ions form insoluble or insoluble compounds to precipitate out. However, the precipitant used in this method is more expensive, and harmful gases are easy to be discharged during the treatment, and the removal of the residue after the reaction is difficult. There are certain difficulties; the electrolytic reduction method is to precipitate heavy metal ions on the electrodes through electrolysis. This method is easy to operate and does not need to consume chemicals, but the electricity and metal electrodes consume a lot, and a large amount of sludge is generated during the treatment process. treatment; the physical method is used to treat wastewater with high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 1 g of activated carbon and 50 mL of 12mol / L concentrated nitric acid and reflux at 120°C for 24 hours, then cool naturally to room temperature, filter the nitric acid solution with filter paper, and wash with deionized water until the pH value of the filtrate is close to 6; the dried filter residue Place in 20mL of ethylenediamine, ultrasonically disperse, add 2mL of concentrated sulfuric acid, reflux at 120°C for 12h, cool to room temperature naturally, centrifuge at 4000rpm for 30min, and wash by centrifugation for 5 times to remove excess ethylenediamine to obtain amine Based functionalized graphene quantum dots;

[0022] Take 100mL of copper nitrate solution with an initial concentration of 15mg / L, adjust the pH to 7, add 200mg of amine functionalized graphene quantum dots, react for 30min, then add 50mg of sodium chloride, let it stand for 30min, take the supernatant, use atomic The concentration of residual copper ions in the solution was measured by absorpt...

Embodiment 2

[0024] Take 50 g of activated carbon and 200 mL of 16 mol / L concentrated nitric acid, reflux at 150 ° C for 36 h, cool naturally to room temperature, filter the nitric acid solution with filter paper, and wash with deionized water until the pH value of the filtrate is close to 6; the dried filter residue Place in 100mL of ethylenediamine, ultrasonically disperse, add 20mL of concentrated sulfuric acid, reflux at 160°C for 36h, cool to room temperature naturally, centrifuge at 4000rpm for 20min, and wash by centrifugation for 5 times to remove excess ethylenediamine to obtain amine Functionalized graphene quantum dots;

[0025] Take 100mL of copper nitrate solution with an initial concentration of 300mg / L, adjust the pH to 8, add 200mg of amine-functionalized graphene quantum dots, react for 60min, then add 50mg of sodium chloride, let stand for 30min, take the supernatant, and use atomic The concentration of residual copper ions in the solution was measured by absorption, and ...

Embodiment 3

[0027] Take 25g of activated carbon and 250 mL of 1mol / L concentrated nitric acid and reflux at 60°C for 12h, then cool naturally to room temperature, filter the nitric acid solution with filter paper, and wash with deionized water until the pH value of the filtrate is close to 6; the dried filter residue Place in 200ml of ethylenediamine, ultrasonically disperse, add 10ml of concentrated sulfuric acid, reflux at 60°C for 24 hours, cool to room temperature naturally, centrifuge at 4000rpm for 10min, and wash by centrifugation for 5 times to remove excess ethylenediamine to obtain amine Functionalized graphene quantum dots;

[0028] Take 100 mL of copper nitrate solution with an initial concentration of 150 mg / L, adjust the pH to 6, add 200 mg of amine functionalized graphene quantum dots, react for 10 min, then add 50 mg of sodium chloride, let stand for 30 min, take the supernatant, and use The concentration of residual copper ions in the solution was determined by atomic abs...

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Abstract

The invention discloses an amino functional graphene quantum dot and the preparation and application thereof, and belongs to the field of material preparation. According to the amino functional graphene quantum dot and the preparation and application thereof, activated carbon serves as the raw material, after the activated carbon is oxidized through nitric acid, filtration is conducted to remove the nitric acid, oxidized activated carbon is washed through water to be close to neutral, and the graphene quantum dot is obtained. The surface of the obtained graphene quantum dot is provided with a large number of oxygen-containing functional groups such as carboxyl and hydroxy, and therefore the graphene quantum dot can be stably dispersed into water under the neutral condition. Complexing of the carboxyl and the hydroxy on the surface of the graphene quantum dot and most heavy metal ions can be achieved, agglomeration can be caused, and coprecipitation of the graphene quantum dot and the heavy metal ions is achieved finally. Therefore, the graphene quantum dot can be used for purification of industrial waste water containing the heavy metal ions. The production method of the graphene quantum dot is simple, convenient, rapid, low in cost and high in yield; the obtained graphene quantum dot has a good effect on removing the heavy metal ions, and the graphene quantum dot which is subjected to desorption and regeneration treatments can be recycled.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to an amine functionalized graphene quantum dot and its preparation and application. Background technique [0002] Heavy metal ion wastewater is a kind of industrial wastewater that is extremely harmful to the ecological environment. In the field of environment and human health, heavy metals mainly refer to mercury (Hg), cadmium (Cd), lead (Pb), chromium (cr), arsenic (As), copper (Cu), zinc (Zn), cobalt (Co), Heavy metals such as nickel (Ni). They exist in the environment in different forms, and migrate and accumulate in the environment. Mining, metallurgy, chemical industry and other industries are the main sources of man-made pollution in water bodies. The excessive accumulation of heavy metals in the food chain will cause great harm to the natural environment and human health. At present, the treatment methods of wastewater containing heavy metal ions are main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/62C02F101/20
Inventor 林淑卿
Owner 泉州市福达科技咨询有限公司
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