CN116177692A - MOFs derived carbon electrode material for CDI dephosphorization and electrode - Google Patents
MOFs derived carbon electrode material for CDI dephosphorization and electrode Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 39
- 239000012621 metal-organic framework Substances 0.000 title claims abstract description 37
- 239000007772 electrode material Substances 0.000 title claims abstract description 30
- 239000013179 MIL-101(Fe) Substances 0.000 claims abstract description 19
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 12
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000002243 precursor Substances 0.000 claims abstract description 7
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 7
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 239000006230 acetylene black Substances 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 12
- 239000006185 dispersion Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 15
- 229910052698 phosphorus Inorganic materials 0.000 description 15
- 239000011574 phosphorus Substances 0.000 description 15
- 238000001179 sorption measurement Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 238000007792 addition Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010452 phosphate Substances 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 238000002242 deionisation method Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013082 iron-based metal-organic framework Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- -1 phosphate anions Chemical class 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Abstract
The invention discloses a MOFs derived carbon electrode material and an electrode for CDI dephosphorization, which relate to the technical field of CDI electrode materials and are prepared by the following steps: in the presence of MIL-101 (Fe) and Zn (NO) 3 ) 2 6H 2 Adding active carbon, 2-methylimidazole and hexadecyl trimethyl ammonium bromide into a methanol solution of O, stirring for 4-6 hours at room temperature, centrifuging, washing, drying in vacuum to obtain a precursor, and putting the precursor into N 2 And pyrolyzing for 2 hours at 800 ℃ in the atmosphere to obtain the MOFs derived carbon electrode material. According to the MOFs derived carbon electrode material, fe and N elements are fully and uniformly dispersed on the surface of Fe@N/C, and the conductivity of the MOFs derived carbon electrode material can be improved due to the porous structure and abundant C doping; n-doping can promoteThe uniform dispersion of metal atoms introduces additional active sites, improves hydrophilicity and enhances electrochemical performance. Thus, the combination of Fe and N may further enhance CDI dephosphorization performance.
Description
Technical Field
The invention relates to the technical field of CDI electrode materials, in particular to a MOFs derived carbon electrode material for removing phosphorus from CDI and an electrode.
Background
Phosphorus (P) is an important nutrient for maintaining normal functioning of the ecosystem. However, excessive phosphorus in the body of water may accelerate eutrophication, resulting in deterioration of the aquatic ecosystem. Currently, chemical precipitation, biological treatment, adsorption treatment, etc. have been used for the removal of phosphorus from water. Chemical precipitation is effective for treating wastewater of high phosphorus concentration, but requires a complicated control system and high dosage of chemicals, generates a large amount of sludge, and must be properly treated. Biological treatment is economical and environmentally friendly in terms of phosphate removal, however its removal efficiency is sensitive to changes in environmental conditions, while also facing the problem of producing large amounts of sludge. The adsorption process is considered as a feasible sewage treatment step in municipal sewage treatment, and has the advantages of high efficiency, high removal rate, good selectivity, easy operation and the like. Although various adsorbent materials have been manufactured for removing phosphate from water, most adsorbents appear to be challenged by poor adsorption capacity and stringent regeneration conditions.
Capacitive Deionization (CDI) is an electrochemical adsorption technology which does not need additional chemicals, does not produce sludge and is little affected by environment, and has the advantages of low energy consumption, low cost, high removal rate, easiness in regeneration and the like. When an external voltage is applied, charged ions migrate to the polarized electrode and store under the drive of electrostatic force, thereby forming an electric double layer, and removing the ions from the water; when short-circuited or a reverse external voltage is applied, charged ions are desorbed from the electrode, so that the electrode regeneration can be achieved without strict regeneration conditions. However, conventional carbon material electrodes (such as activated carbon) have poor adsorption of phosphorus. Therefore, the core for achieving CDI technology for phosphorus removal is the development of efficient electrode materials.
The metal-organic frameworks (MOFs) are constructed by organic linkers and metal ions, and have the characteristics of high specific surface area, abundant active sites and the like, and particularly Fe-based MOFs (such as MIL-101 (Fe)) are considered to be efficient phosphate adsorbents. However, the easy agglomeration of metal particles of MOFs hampers their use. Therefore, there is a need to develop more efficient ways to increase phosphorus removal efficiency. The combination of MOFs materials and CDI technology can make up for the deficiencies of conventional CDI electrodes, thereby ensuring the capture of phosphate anions. However, due to the high resistance of most MOFs materials, the prior art fails to provide MOFs materials suitable for CDI in time. Thus, the improvement of the dispersibility and electrochemical properties of MOFs materials is of decisive importance for the successful binding of MOFs and CDI technologies.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a MOFs derivative carbon electrode material for removing phosphorus from CDI and an electrode, so as to solve the technical problem that the MOFs material is easy to agglomerate and has high resistance so as to be difficult to be applied to CDI technology in the prior art.
The technical scheme adopted by the invention is as follows:
the MOFs derived carbon electrode material for CDI dephosphorization is prepared by the following steps: in the presence of MIL-101 (Fe) and Zn (NO) 3 ) 2 6H 2 Adding active carbon, 2-methylimidazole and hexadecyl trimethyl ammonium bromide into a methanol solution of O, stirring for 4-6 hours at room temperature, centrifuging, washing, drying in vacuum to obtain a precursor, and putting the precursor into N 2 And pyrolyzing for 2 hours at 800 ℃ in the atmosphere to obtain the MOFs derivative carbon electrode material.
Preferably, the amount of MIL-101 (Fe) added is 0.25-1% of the mass of the activated carbon.
Preferably, the Zn (NO 3 ) 2 6H 2 The mass ratio of the addition amount of O to MIL-101 (Fe) is 50-100:1.
Preferably, the mass ratio of the addition amount of the 2-methylimidazole to MIL-101 (Fe) is 60-120:1.
Preferably, the addition amount of the cetyl trimethyl ammonium bromide is 80-140% of the mass of MIL-101 (Fe).
Preferably, the MIL-101 (Fe) is preparedThe process is as follows: feCl is added 3· 6H 2 And (3) uniformly mixing the DMF solution of O and the DMF solution of terephthalic acid, transferring the mixture into a high-pressure reaction kettle, reacting for 18-24 hours at 100-120 ℃, centrifuging, washing and drying in vacuum to obtain MIL-101 (Fe).
An electrode containing any MOFs derived carbon electrode material comprises the following components in parts by weight: 80 parts of MOFs derived carbon electrode material, 10 parts of acetylene black and 10 parts of PVDF.
According to the preparation method of the electrode, MOFs derived carbon electrode material, acetylene black and PVDF are added into DMF, and are uniformly mixed at room temperature to form carbon slurry, the slurry is uniformly coated on a graphite sheet, and the electrode sheet is prepared by vacuum drying at 60-80 ℃ for 12-24 hours.
In summary, compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the MOFs derived carbon electrode material provided by the invention, fe and N elements are fully and uniformly dispersed on the surface of Fe@N/C, and the porous structure and abundant C doping of the MOFs derived carbon electrode material can improve charge transfer and chemical stability, so that the conductivity of the MOFs derived carbon electrode material is improved, the uniform dispersion of metal oxides in a carbon matrix can be promoted, the self-agglomeration of the metal oxides is prevented, and the conductivity of the metal oxides is improved; the nitrogen doping can further promote the uniform dispersion of metal atoms, introduce additional active sites, improve the hydrophilicity and enhance the electrochemical performance;
2. the Fe@N/C electrode prepared by the method has higher electrochemical performance and adsorption capacity than N/C and original AC. In addition, the concentration of phosphorus effluent when the Fe@N/C electrode is used is 0.46mg P/L, and 0.5mg P/L meeting the national first class A emission standard (GB 18918-2002);
3. the invention has low production cost, and the medicine cost of Fe@N/C required by each electrode is only 9.2 multiplied by 10 -4 $/cm 2 ；
4. When the electrode prepared by the invention is applied to CDI dephosphorization, the energy consumption and the operation cost are greatly reduced, and under the condition of 1.2V, the energy consumption and the operation cost of Fe@N/C for CDI dephosphorization are respectively reduced to 5.18KWh/Kg P (2.23 multiplied by 10) -2 KWh/m 3 ) And 1.73X10 -3 $/m 3 。
Drawings
FIG. 1 is a schematic diagram of a capacitive deionization system;
FIG. 2 is a graph of the elemental C, N, O and Fe profile for a Fe@N/C surface;
FIG. 3 is a graph of the electro-adsorption capacity and phosphorus concentration for the original AC, N/C, and Fe@N/C;
FIG. 4 is a graph of Fe@N/C electroadsorption capacity for different MIL-101 (Fe) additions.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention.
The word "embodiment" as used herein does not necessarily mean that any embodiment described as "exemplary" is preferred or advantageous over other embodiments. Performance index testing in this method example unless otherwise specified, conventional testing methods in the art were employed. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; other raw materials, reagents, test methods and technical means not specifically mentioned in the present invention refer to raw materials and reagents commonly used by those skilled in the art, and experimental methods and technical means commonly employed.
Examples
The MOFs-derived carbon electrode material and electrode for CDI dephosphorization provided in this example were prepared as follows:
step 1: material preparation
Preparation of MIL-101 (Fe)
30mL of the mixture contains 2.703g FeCl 3· 6H 2 O N, N-Dimethylformamide (DMF) and 30mL of the mixture containingA solution of 0.830g terephthalic acid in DMF was mixed well and then transferred to a 100mL PTFE-lined autoclave and heated at 110℃for 20 hours. Next, the mixture was centrifuged and washed, and dried in vacuo to obtain MIL-101 (Fe), which was further pulverized for use.
Preparation of Fe@N/C
10mg (m) MIL-101(Fe)/AC =0.5%) MILs-101 (Fe) and 0.793g Zn (NO 3 ) 2 6H 2 O was added to 75mL of a methanol solution containing 2g of Activated Carbon (AC), 0.012g of 2-methylimidazole and 0.012g of cetyltrimethylammonium bromide (CTAB), stirred at room temperature for 5 hours, centrifuged, washed, and dried under vacuum for 12 hours. The obtained precursor is shown in N 2 Pyrolysis was carried out at 800℃for 2 hours under an atmosphere, and the resultant product was designated Fe@N/C. N/C was prepared under the same conditions without adding MIL-101 (Fe). Wherein, as shown in fig. 2, the distribution diagram of the elements of C, N, O and Fe on the surface of Fe@N/C shows that the elements of Fe and N are distributed on the surface of Fe@N/C, which benefits from the good dispersion effect of N on Fe and the unique structure of MOFs derived carbon. In addition, xFe@N/C (x=0.25%, 0.75%, 1%) of different MIL-101 (Fe) additions were also prepared under the same conditions.
Step 2: electrode preparation
The synthesized sample of step 1, acetylene black (conductive agent) and PVDF (binder) were added to DMF at a weight ratio of 80:10:10, and mixed uniformly at room temperature to form a carbon slurry. And uniformly coating the slurry on a graphite sheet, and vacuum drying at 60 ℃ for 12 hours to finally prepare the electrode sheet.
As shown in Table 1, the specific capacitance of electrodes prepared using different Fe@N/C, N/C and the original activated carbon AC at a scan rate of 1 mV/s:
TABLE 1 specific capacitance of different electrodes (F/g)
| Original AC | N/C | 0.25％Fe@N/C | (0.5％)Fe@N/C | 0.75％Fe@N/ |
1％Fe@N/C |
| 27.69 | 73.93 | 80.76 | 110.80 | 48.61 | 39.73 |
The specific capacitances of the original AC, N/C and (0.5%) Fe@N/C electrodes were 27.69, 73.93, and 110.80F/g (Table 1), indicating that the electrochemical performance of Fe@N/C was better than that of the original AC and N/C. This is because the introduced Fe and N are advantageous for improving electrochemical properties, which is significant for improving CDI properties.
Step 3: CDI experiment
As shown in FIG. 1, for the capacitive deionization and dephosphorization system used in the electrode of this example, the CDI unit comprises an Activated Carbon (AC) cathode (5X 5 cm) 2 ) And an active Fe@N/C anode (5X 5 cm) 2 ). 100mL of 5mg P/L solution is pumped into a CDI device by a peristaltic pump at a flow rate of 20mL/min under the condition of 1.2V, and at preset time, a sample is collected, the phosphorus concentration is detected, and the phosphorus adsorption effect is calculated.
As shown in FIG. 3, the Fe@N/C electrode has a higher adsorption capacity than N/C and the original AC. In addition, the concentration of phosphorus effluent when the Fe@N/C electrode is used is 0.46mg P/L, and reaches 0.5mg P/L of national first-class A emission standard, which shows that the Fe@N/C has good electric adsorption performance and practical applicability. This result is consistent with the calculated specific capacitance (table 1).
As shown in FIG. 4, (0.5%) Fe@N/C electrode had higher adsorption capacity than 0.25% Fe@N/C,0.75% Fe@N/C and 1% Fe@N/C, indicating that the addition of an appropriate amount of 0.5% Fe gives the electrode better electrochemical performance (specific capacitance) (Table 1), resulting in optimal electrosorption performance.
In addition, in the present embodiment, the cost of the medicine required for each electrode with the best performance is only 9.2×10 -4 $/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Under the condition of 1.2V, the energy consumption and the running cost of Fe@N/C for removing the phosphorus of the CDI are respectively as low as 5.18KWh/Kg P (2.23 multiplied by 10) - 2 KWh/m 3 ) And 1.73X10 -3 $/m 3 。
The foregoing examples merely represent specific embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, which fall within the protection scope of the present application.
Claims (8)
1. The MOFs derived carbon electrode material for CDI dephosphorization is characterized in that the preparation process comprises the following steps: in the presence of MIL-101 (Fe) and Zn (NO) 3 ) 2 6H 2 Adding active carbon, 2-methylimidazole and hexadecyl trimethyl ammonium bromide into a methanol solution of O, stirring for 4-6 hours at room temperature, centrifuging, washing, drying in vacuum to obtain a precursor, and putting the precursor into N 2 And pyrolyzing for 2 hours at 800 ℃ in the atmosphere to obtain the MOFs derivative carbon electrode material.
2. The MOFs derived carbon electrode material for CDI dephosphorization according to claim 1, wherein the amount of MILs-101 (Fe) added is 0.25-1% of the mass of activated carbon.
3. The MOFs-derived carbon electrode material for CDI dephosphorization according to claim 1, wherein the Zn (NO 3 ) 2 6H 2 The mass ratio of the addition amount of O to MIL-101 (Fe) is 50-100:1.
4. The MOFs-derived carbon electrode material for CDI dephosphorization according to claim 1, wherein the mass ratio of the added amount of 2-methylimidazole to MILs-101 (Fe) is 60-120:1.
5. The MOFs derived carbon electrode material for CDI dephosphorization according to claim 1, wherein the added amount of cetyltrimethylammonium bromide is 80-140% of the mass of MIL-101 (Fe).
6. The MOFs-derived carbon electrode material for CDI dephosphorization according to claim 1, wherein the MILs-101 (Fe) is prepared by the process of: will contain FeCl 3· 6H 2 The N, N-dimethylformamide solution of O and the N, N-dimethylformamide solution of terephthalic acid are uniformly mixed, then transferred into a reaction vessel to react for 18 to 24 hours at the temperature of 100 to 120 ℃, and finally MIL-101 (Fe) is obtained after centrifugation, washing and vacuum drying.
7. An electrode comprising the MOFs-derived carbon electrode material for CDI dephosphorization according to any one of claims 1 to 6, characterized by comprising the following components in parts by weight: 80 parts of MOFs derived carbon electrode material, 10 parts of acetylene black and 10 parts of PVDF.
8. The method for preparing an electrode according to claim 7, wherein MOFs-derived carbon electrode material, acetylene black and PVDF are added to DMF, mixed uniformly at room temperature to form a carbon slurry, the slurry is coated uniformly on a graphite sheet, and dried in vacuum at 60 to 80 ℃ for 12 to 24 hours to obtain the electrode sheet.
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