CN115504454B - Preparation of novel green rare earth doped carbon point corrosion inhibitor and method for modifying novel green rare earth doped carbon point corrosion inhibitor by ionic liquid - Google Patents
Preparation of novel green rare earth doped carbon point corrosion inhibitor and method for modifying novel green rare earth doped carbon point corrosion inhibitor by ionic liquid Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 59
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 239000003112 inhibitor Substances 0.000 title claims abstract description 43
- 239000002608 ionic liquid Substances 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 29
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 22
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 4
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 60
- 239000000243 solution Substances 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 22
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000012043 crude product Substances 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 11
- 238000000502 dialysis Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000001291 vacuum drying Methods 0.000 claims description 10
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- HKVFISRIUUGTIB-UHFFFAOYSA-O azanium;cerium;nitrate Chemical compound [NH4+].[Ce].[O-][N+]([O-])=O HKVFISRIUUGTIB-UHFFFAOYSA-O 0.000 claims description 6
- XMPZTFVPEKAKFH-UHFFFAOYSA-P ceric ammonium nitrate Chemical compound [NH4+].[NH4+].[Ce+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O XMPZTFVPEKAKFH-UHFFFAOYSA-P 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005119 centrifugation Methods 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 239000007853 buffer solution Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000002194 synthesizing effect Effects 0.000 claims description 4
- MCMFEZDRQOJKMN-UHFFFAOYSA-N 1-butylimidazole Chemical compound CCCCN1C=CN=C1 MCMFEZDRQOJKMN-UHFFFAOYSA-N 0.000 claims description 3
- WJAXXWSZNSFVNG-UHFFFAOYSA-N 2-bromoethanamine;hydron;bromide Chemical compound [Br-].[NH3+]CCBr WJAXXWSZNSFVNG-UHFFFAOYSA-N 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide Substances CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 claims description 2
- FPQQSJJWHUJYPU-UHFFFAOYSA-N 3-(dimethylamino)propyliminomethylidene-ethylazanium;chloride Chemical compound Cl.CCN=C=NCCCN(C)C FPQQSJJWHUJYPU-UHFFFAOYSA-N 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 2
- 238000011049 filling Methods 0.000 claims 1
- 238000005303 weighing Methods 0.000 claims 1
- 230000005764 inhibitory process Effects 0.000 abstract description 11
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003929 acidic solution Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000001308 synthesis method Methods 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052684 Cerium Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006961 mixed inhibition Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000012264 purified product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
Abstract
The invention adopts a microwave method to prepare rare earth Ce doped carbon dots (CeCD), and explores a green, convenient and efficient synthesis method to prepare the carbon dot corrosion inhibitor. Meanwhile, the modification effect of the ionic liquid on the rare earth element doped carbon point corrosion inhibitor is explored by a method for modifying the ionic liquid. The research surface shows that the water solubility and the dispersibility of the CeCD (IL-CeCD) modified by the ionic liquid are obviously improved, the agglomeration phenomenon of carbon points is obviously reduced, and the corrosion inhibition performance of the IL-CeCD in an acidic solution is improved compared with that of the ionic liquid, so that the corrosion inhibition performance of the IL-CeCD is greatly improved relative to that of the CeCD. The corrosion inhibitor method provided by the invention has the characteristics of environment friendliness, simplicity in preparation, low cost, effective corrosion inhibition and the like, and has popularization and application values.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploitation chemical corrosion prevention application, in particular to a method for preparing a novel rare earth element Ce doped carbon point corrosion inhibitor and modifying the carbon point corrosion inhibitor by ions.
Background
Metal corrosion is an important difficult problem for limiting global industrial development, the most economical and convenient method in the current corrosion prevention technology is a corrosion inhibitor technology, the traditional corrosion inhibitor has the problems of high toxicity, high manufacturing cost and environmental pollution, and researchers aim at developing and producing environment-friendly, economical and efficient corrosion inhibitors. The carbon dot has the advantages of small size (below 10 nm), simple preparation, low cost and environmental protection, and the complex defect structure ensures that the carbon dot has higher molecular activity. Therefore, rare earth Ce element with corrosion inhibition function is introduced as heteroatom to prepare CeCD, and the agglomeration phenomenon and water solubility of the CeCD are improved by grafting ionic liquid.
Disclosure of Invention
The invention aims to introduce rare earth element Ce doping on the basis of carbon points to modify the carbon points, and then further modify the carbon points by using imidazole ionic liquid to explore a method for improving corrosion inhibition performance of the carbon points.
The technical proposal comprises:
1. the preparation technology of the novel green rare earth doped carbon point corrosion inhibitor and the method for modifying the novel green rare earth doped carbon point corrosion inhibitor by using the ionic liquid comprise the following steps:
firstly, synthesizing rare earth element doped carbon dots with nanometer size by a microwave hydrothermal method, wherein the specific preparation process is as follows:
(1) 0.548g of ammonium cerium nitrate solid was weighed out and dissolved in deionized water, and the mixture was sonicated for 10min until the solid was completely dissolved.
(2) 1g of citric acid and 0.8g of urea were weighed and 500. Mu.L of a 0.01mol/L ammonium cerium nitrate solution was added to the mixture and the mixture was sonicated for 20 minutes until the solid was completely dissolved, to form a clear liquid in a pale orange color.
(3) Placing the solution into a microwave oven, setting the microwave power to be 800W and the time to be 4min to obtain a CeCD crude product, dissolving the CeCD crude product into deionized water, and slowly pouring the CeCD crude product into a centrifuge tube.
(4) And putting the centrifugal test tube into a centrifugal machine for centrifugation, wherein the centrifugal speed is 8000r/min, and the time is 10min.
(5) The filtrate was poured into a pre-treated dialysis bag with a molecular weight cut-off of 500D, and the dialysis bag was placed in a 1L beaker filled with deionized water. Adding the magnetons into a beaker for magnetic stirring for 48 hours, wherein the water changing interval is 2-3 hours. Finally, the dialyzed product is dried for 24 hours at 40 ℃ in a vacuum drying oven to obtain the CeCD.
Secondly, synthesizing the imidazole ionic liquid with the terminal amino groups by a hydrothermal method, wherein the preparation process is as follows:
(1) 1-butylimidazole and 2-bromoethylamine hydrobromic acid with the same molar ratio (0.01 mol) are mixed and dissolved in a single-neck flask by 5ml of ethanol, heated to 90 ℃ by an oil bath pot and put into a magneton machine to be stirred for 12 hours, thus generating light yellow sticky liquid
(2) The crude product is purified by a mixed solution precipitation method of ethyl acetate and ethanol
(3) Then the solution is placed in a vacuum drying oven for vacuum drying at 60 ℃ for 9 hours, and finally the amino-terminated imidazole ionic liquid is obtained
Thirdly, grafting the amino-terminated imidazole ionic liquid to CeCD by a hydrothermal method to modify the amino-terminated imidazole ionic liquid.
(1) The prepared CeCD is fully dissolved and mixed with 100mL of buffer solution to form a CeCD corrosion inhibitor solution. 2g of imidazole ionic liquid is dissolved in 20mL of ethanol, and 0.5mL of triethylamine is slowly added dropwise;
(2) Then adding the mixed CeCD corrosion inhibitor solution into the imidazole ionic liquid solution, heating to 60 ℃ by using an oil bath pot, and adding the mixture into a magneton for mechanical stirring for 24 hours; the product is put into a vacuum drying oven to be dried for 12 hours
(3) And (3) dissolving the dried product in 30mL of deionized water, dialyzing in deionized water for 24 hours by using a dialysis bag with the average molecular weight of 500DA, replacing the deionized water every 2-3 hours on average, and finally drying the dialyzed product in a vacuum drying oven at 40 ℃ for 24 hours to obtain the IL-CeCD modified by the imidazole ionic liquid.
Further, in the step (one) (1), the volume of the deionized water is 100ml, and the concentration of the prepared ceric ammonium nitrate solution is 0.01mol/L.
Further, in the step (one) (4), after the filtrate is extracted, the filtrate needs to be centrifuged again. The centrifugation was repeated three times.
Further, in the step (one) (5), the obtained CeCD has a particle size of 1-10nm.
Further, in the step (II) (2), the mixing volume ratio of the mixed solution of ethyl acetate and ethanol is 1:1, and the total volume of the solution is 500mL.
Further, in the step (II) (3), after drying for 9 hours, the dryness of the vacuum drying oven should be at least ensured not to be changed for 30 minutes.
Further, the buffer in the step (III) (1) was 0.1mol/L of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride.
The invention has the advantages that:
(1) The corrosion inhibitor provided by the invention is an adsorption type corrosion inhibitor, can be rapidly adsorbed on the surface of metal to form a layer of compact corrosion inhibitor film, and can prevent the permeation of acid liquor, so that the corrosion of the metal can be effectively prevented.
(3) The corrosion inhibition main agent adopted in the invention is green and environment-friendly, easy to prepare and low in cost.
(4) Aiming at the problems that the surface energy of the nano particle carbon dot is strong and agglomeration phenomenon is easy to occur, the stability and the dispersibility of the nano particle carbon dot are enhanced by the ionic liquid, and the ionic liquid has good corrosion inhibition.
Drawings
FIG. 1 is an electrochemical impedance diagram of the rare earth cerium doped carbon point corrosion inhibitor CeCD provided by the invention in 1mol/L hydrochloric acid solution to N80 steel. (Nyqust plot of CeCD)
FIG. 2 is an electrochemical impedance diagram of the ionic liquid modified rare earth cerium doped carbon point corrosion inhibitor IL-CeCD provided by the invention in 1mol/L hydrochloric acid solution to N80 steel. (Nyqust plot of IL-CeCD)
Fig. 3 is an infrared spectrum of the rare earth cerium doped carbon point corrosion inhibitor CeCD provided by the invention. (FTIR graph of CeCD)
Fig. 4 is an infrared spectrogram of the rare earth cerium doped carbon point corrosion inhibitor IL-CeCD modified by the ionic liquid. (FTIR graph of IL-CeCD)
Detailed description of the preferred embodiments
The invention provides a preparation method of a novel green rare earth doped carbon point corrosion inhibitor and a method for modifying the novel green rare earth doped carbon point corrosion inhibitor by using ionic liquid, and in order to make the advantages and the technical scheme of the novel green rare earth doped carbon point corrosion inhibitor clearer and more definite, the novel green rare earth doped carbon point corrosion inhibitor is described in detail below by combining specific embodiments.
The raw materials required by the invention can be purchased through commercial sources.
Example 1:
0.548g of ammonium cerium nitrate solid was weighed out and dissolved in deionized water, and the mixture was sonicated for 10min until the solid was completely dissolved. 1g of citric acid and 0.8g of urea were weighed and 500. Mu.L of a 0.01mol/L ammonium cerium nitrate solution was added to the mixture and the mixture was sonicated for 20 minutes until the solid was completely dissolved, to form a clear liquid in a pale orange color. Placing the solution into a microwave oven, setting the microwave power to be 800W for 4min to obtain a crude CeCD product, dissolving the crude CeCD product into deionized water, repeatedly centrifuging for three times, placing into a dialysis bag with the molecular weight cut-off of 500DA for dialysis for 24h, and drying to obtain the CeCD. The reaction route is as follows:
example 2:
1-butylimidazole and 2-bromoethylamine hydrobromic acid in an equimolar ratio (0.01 mol) were mixed and dissolved in 5ml of ethanol in a single-necked flask, heated to 90℃in an oil bath and placed in a magnetor to be mechanically stirred for 12 hours to give a pale yellow viscous liquid to give a crude product. Purifying the crude product by using a mixed solution precipitation method of ethyl acetate and ethanol, and finally drying the purified product to obtain the amino-terminated imidazole ionic liquid. The reaction route is as follows:
example 3:
the prepared CeCD is fully dissolved and mixed with 100mL of buffer solution to form a CeCD corrosion inhibitor solution. Then 2g of imidazole ionic liquid is dissolved in 20mL of ethanol, 0.5mL of triethylamine is slowly dripped, then the mixed CeCD corrosion inhibitor solution is added into the imidazole ionic liquid solution, the mixture is heated to 60 ℃ by an oil bath pot and is put into a magneton machine for stirring for 24 hours to obtain a crude product, and finally the crude product is put into a dialysis bag with the molecular weight cut-off of 500DA for dialysis for 24 hours, and is dried to obtain the IL-CeCD. The reaction route is as follows:
example 4:
the corrosion inhibition effect of the prepared corrosion inhibitors CeCD and IL-CeCD on N80 steel in 1mol/L hydrochloric acid solution is tested at different concentrations, the test temperature is 25 ℃, the corrosion time is 24 hours, and the results are shown in Table 1.
The corrosion inhibition efficiency of the two corrosion inhibitors in 1mol/L hydrochloric acid of N80 steel is improved along with the increase of the concentration of the corrosion inhibitors, and the corrosion inhibition rate is reduced until 150mg/L reaches the maximum value. The corrosion inhibition efficiency of the corrosion inhibitor IL-CeCD modified by the ionic liquid is obviously superior to that of CeCD, and the two corrosion inhibitors can reach the index requirement (3.5 g.m) of the first-grade product of the oil industry standard SY/T5405-1996 corrosion inhibitor -2 ·h -1 ) Has good application prospect.
Example 8:
electrochemical testing of corrosion inhibitors CeCD and IL-CeCD on N80 steel.
Electrochemical test using Gamry electrochemical workstation, working electrode (N80 steel sheet) was embedded in epoxy resin and polyamide resin sealed polytetrafluoroethylene sheath with test area of 1.0cm 2 The auxiliary electrode adopts a carbon electrode, the reference electrode adopts a saturated calomel electrode, and the experimental temperature is room temperature. The polarization curve method scans the electrokinetic potential from the cathode to the anode at a scanning speed of 0.5mV/s and a scanning range of-150 mV to 150mV in a strong polarization region. The results are shown in fig. 1 and 2; the graph shows that compared with the CeCD corrosion inhibitor, the corrosion inhibitor grafted with imidazole ionic liquid has obviously increased resistance arc and resistance value, which indicates that the IL-CeCD corrosion inhibitor not only inhibits the anode reaction of corrosion, but also inhibits the cathode reaction of corrosion, thus being a mixed inhibition type corrosion inhibitor. The carbon dots are easier to form an adsorption film on a metal surface due to grafting of the imidazole ionic liquid, and the adsorption film is more stable and has wider coverage area;
the parts not described in detail in this embodiment and the english abbreviations are common general knowledge in the industry and can be found on the internet, and are not described here. All related chemical reagent markets are sold
The invention can be realized by referring to the prior art in the parts not described.
It is noted that equivalents will be within the scope of the invention by those skilled in the art given the benefit of this disclosure.
Claims (1)
1. The preparation method of the green rare earth doped carbon dot corrosion inhibitor comprises the following steps:
firstly, synthesizing rare earth element doped carbon dots with nanometer size by a microwave hydrothermal method, wherein the specific preparation process is as follows:
(1) Weighing 0.548g of ammonium cerium nitrate solid, dissolving the ammonium cerium nitrate solid in deionized water, and carrying out ultrasonic oscillation on the mixture for 10min until the solid is completely dissolved;
(2) 1g of citric acid and 0.8g of urea are weighed, 500 mu L of 0.01mol/L ceric ammonium nitrate solution is added, and ultrasonic oscillation is carried out for 20min until the solid is completely dissolved, so that light orange transparent liquid is formed;
(3) Placing the solution into a microwave oven, setting the microwave power to be 800W and the time to be 4min to obtain a CeCD crude product, dissolving the CeCD crude product into deionized water, and slowly pouring the CeCD crude product into a centrifuge tube;
(4) Putting the centrifugal test tube into a centrifugal machine for centrifugation, wherein the centrifugation speed is 8000r/min, and the time is 10min; extracting the filtrate, and centrifuging again; centrifugation was repeated three times;
(5) Pouring the filtrate into a pretreated dialysis bag with the molecular weight cut-off of 500D, putting the dialysis bag into a 1L beaker, and filling deionized water; adding the magnetons into a beaker for magnetic stirring for 48 hours, wherein the water changing interval is 2-3 hours; finally, placing the dialyzed product in a vacuum drying oven to be dried at 40 ℃ for 24 hours to obtain CeCD; secondly, synthesizing the imidazole ionic liquid with the terminal amino groups by a hydrothermal method, wherein the preparation process is as follows:
(1) Mixing 0.01mol of 1-butylimidazole and 0.01mol of 2-bromoethylamine hydrobromic acid with 5ml of ethanol, dissolving in a single-neck flask, heating to 90 ℃ by an oil bath pot, and adding magnetons to mechanically stir for 12 hours to generate light yellow viscous liquid;
(2) Purifying the crude product by a mixed solution precipitation method of ethyl acetate and ethanol;
(3) Then placing the solution in a vacuum drying oven to be dried for 9 hours at 60 ℃ in vacuum, and finally obtaining the amino-terminated imidazole ionic liquid; thirdly, grafting the amino-terminated imidazole ionic liquid to CeCD by a hydrothermal method to modify the amino-terminated imidazole ionic liquid:
(1) Fully dissolving and mixing the prepared CeCD with 100mL of buffer solution to form a CeCD corrosion inhibitor solution; 2g of imidazole ionic liquid is dissolved in 20mL of ethanol, and 0.5mL of triethylamine is slowly added dropwise;
(2) Then adding the mixed CeCD corrosion inhibitor solution into the imidazole ionic liquid solution, heating to 60 ℃ by using an oil bath pot, and adding the mixture into a magneton for mechanical stirring for 24 hours; drying the product in a vacuum drying oven for 12 hours;
(3) Dissolving the dried product in 30mL of deionized water, dialyzing in deionized water for 24 hours by using a dialysis bag with the average molecular weight of 500DA, replacing the deionized water every 2-3 hours on average, and finally drying the dialyzed product in a vacuum drying oven at 40 ℃ for 24 hours to obtain the IL-CeCD modified by the imidazole ionic liquid;
the volume of the deionized water in the step (one) (1) is 100ml, and the concentration of the prepared ceric ammonium nitrate solution is 0.01mol/L;
the mixing volume ratio of the mixed solution of ethyl acetate and ethanol in the step (II) (2) is 1:1;
the buffer solution in the step (three) is 0.1mol/L of 1-ethyl- (3-dimethylaminopropyl) carbodiimide hydrochloride.
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