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Method for synthesizing surface functional group modified carbon quantum dots and application to nano oil displacement

A technology of surface functional groups and carbon quantum dots is applied in the field of improving oil displacement rate, and surface functional groups modify carbon quantum dots to improve oil displacement rate, which can solve the problems of large environmental pollution, high cost, unfavorable large-scale application, etc. , The effect of low production cost and easy industrial production

Active Publication Date: 2020-06-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to enhance oil recovery, injection of polymer solution or surfactant solution is often used, but these two have disadvantages such as high cost and great environmental pollution, which are not conducive to large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: the preparation of surface carboxyl modified carbon quantum dots:

[0043] Add 1.0 g of anhydrous citric acid into 100 mL of deionized water, and ultrasonically disperse for 30 min to make the dispersion uniform. The solution was kept in a polytetrafluoroethylene reactor at 200° C. for 5 hours, and after the reaction was completed, the reaction solution was cooled to room temperature to obtain a solution containing carboxylated citric acid carbon quantum dots. After centrifuging the solution containing carboxylated citrate carbon quantum dots in a high-speed centrifuge at 10000r / min for 10min, take the supernatant, place it in a 500-1000D dialysis bag, and after dialysis for 48h, freeze-dry the liquid. A purified carboxylated citric acid carbon quantum dot solid was obtained.

[0044] Dry the core, measure the diameter and length of the core, and weigh the quality of the core. Under the pressure condition of -0.1MPa, the core was evacuated for 4 hours to...

Embodiment 2

[0045] Example 2: Preparation of Surface Sulfonic Acid Modified Carbon Quantum Dots

[0046] Add 1.0 g of anhydrous citric acid into 100 mL of deionized water, and ultrasonically disperse for 30 min to make the dispersion uniform. The solution was kept in a polytetrafluoroethylene reactor at 200° C. for 5 hours, and after the reaction was completed, the reaction solution was cooled to room temperature to obtain a solution containing carboxylated citric acid carbon quantum dots. After centrifuging the solution containing carboxylated citrate carbon quantum dots in a high-speed centrifuge at 10000r / min for 10min, take the supernatant, place it in a 500-1000D dialysis bag, and after dialysis for 48h, freeze-dry the liquid. A purified carboxylated citric acid carbon quantum dot solid was obtained. Add the purified carboxylated citric acid carbon quantum dot solid and sodium p-chlorotoluenesulfonate to 100mL deionized water at a mass ratio of 10:1, adjust the pH of the solution to...

Embodiment 3

[0048] Example 3: Preparation of Surface Amide Modified Carbon Quantum Dots

[0049] Add 1.0 g of anhydrous citric acid into 100 mL of deionized water, and ultrasonically disperse for 30 min to make the dispersion uniform. The solution was kept in a polytetrafluoroethylene reactor at 200° C. for 5 hours, and after the reaction was completed, the reaction solution was cooled to room temperature to obtain a solution containing carboxylated citric acid carbon quantum dots. After centrifuging the solution containing carboxylated citrate carbon quantum dots in a high-speed centrifuge at 10000r / min for 10min, take the supernatant, place it in a 500-1000D dialysis bag, and after dialysis for 48h, freeze-dry the liquid. A purified carboxylated citric acid carbon quantum dot solid was obtained. Add the purified carboxylated citric acid carbon quantum dot solid and ammonia water to 100mL deionized water at a mass ratio of 10:1, and ultrasonically disperse the solution for 30min to make...

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Abstract

The invention provides a method for synthesizing surface functional group modified carbon quantum dots and an application of the surface functional group modified carbon quantum dots in nano oil displacement, which comprises the following steps: by using anhydrous citric acid as a carbon source, carrying out a hydrothermal method to obtain a carboxyl modified carbon quantum dot solution, and purifying to obtain a carboxyl modified carbon quantum dot solid; reacting the carboxyl modified carbon quantum dots and sodium p-chloromethylbenzenesulfonate in a polytetrafluoroethylene reaction kettle for 3 h after the pH value of the solution is adjusted to be weakly alkaline, and generating sulfonic group modified carbon quantum dots; reacting the carboxyl modified carbon quantum dot with ammoniawater, and purifying to obtain an amido-modified carbon quantum dot; and reacting the amido-modified carbon quantum dot with sodium hypochlorite in an ice-water bath for 3 hours, adding NaOH to reactfor 8 hours, and purifying to obtain the surface amino-modified carbon quantum dot. The obtained surface functional groups (carboxyl, sulfo, acylamino and amino groups) are used for modifying the carbon quantum dots to carry out a rock core displacement experiment, and the oil displacement rate can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of using surface functional group to modify carbon quantum dots to improve the oil displacement rate, and specifically relates to the synthesis of carboxyl-modified carbon quantum dots, the synthesis of sulfonic acid group-modified carbon quantum dots, the synthesis of amido-modified carbon quantum dots, and the synthesis of amino-modified carbon quantum dots. The synthesis of quantum dots is an efficient and economical synthesis of functionalized modified carbon quantum dots and its application to improve oil displacement. Background technique [0002] Functionalized nanomaterials have the characteristics of large specific surface area and strong surface effect, which can reduce the oil / water interfacial tension and regulate the oil / water mobility ratio at low concentrations to enhance oil recovery. Therefore, functionalized nanoparticles have great application potential in enhanced oil recovery. [0003] ...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C09K8/58
CPCC09K11/65B82Y20/00B82Y40/00C09K8/58
Inventor 林凌时辰亮邓茂青杨玉坤李鑫吴玉洁
Owner SOUTHWEST PETROLEUM UNIV
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