CN117463339A - Defect-assisted iron-containing sludge derived carbon for efficient persulfate catalysis and preparation method thereof - Google Patents
Defect-assisted iron-containing sludge derived carbon for efficient persulfate catalysis and preparation method thereof Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 105
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 28
- 230000007547 defect Effects 0.000 title claims abstract description 26
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 7
- 238000003763 carbonization Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 21
- 239000002243 precursor Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 125000000524 functional group Chemical group 0.000 claims abstract description 9
- 238000010000 carbonizing Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 125000004355 nitrogen functional group Chemical group 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 14
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 6
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 6
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 5
- PLIKAWJENQZMHA-UHFFFAOYSA-N 4-aminophenol Chemical compound NC1=CC=C(O)C=C1 PLIKAWJENQZMHA-UHFFFAOYSA-N 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- 230000003197 catalytic effect Effects 0.000 abstract description 7
- 239000010865 sewage Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 12
- 239000000843 powder Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- -1 nitrogen-containing functional group compound Chemical class 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 238000004435 EPR spectroscopy Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011278 co-treatment Methods 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/745—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/084—Decomposition of carbon-containing compounds into carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a defect-assisted iron-containing sludge derived carbon for high-efficiency persulfate catalysis and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Blending the fine powdery sludge and a precursor containing oxygen or nitrogen functional groups in water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid; 2) Carrying out hydrothermal carbonization on the hydrothermal carbonization precursor liquid obtained in the step 1 to obtain a sludge derivative hydrothermal carbon material doped with functional groups; 3) The sludge derivative hydrothermal carbon material with the doped functional group obtained in the step 2 is treated in N 2 Carbonizing at 900 ℃ in the atmosphere to obtain the defect-assisted iron-containing sludge derived carbon. The sludge derived carbon prepared by the invention has large specific surface area, a plurality of active sites and high catalytic activity, and has good application prospect in the aspects of sludge recycling and sewage treatment.
Description
Technical Field
The invention belongs to the field of environmental nano materials, and particularly relates to defect-assisted iron-containing sludge derived carbon for efficient persulfate catalysis and a preparation method thereof.
Background
Traditional sludge treatment modes, such as incineration, landfill, composting and the like, are difficult to meet the standard due to the inherent characteristics of large sludge volume and complex structure. In addition, secondary pollution and the potential adverse effects of higher energy consumption and carbon emissions must also be considered in the treatment process. Thus, there is an urgent need to explore the balance between achieving both sewage treatment standards and subsequent sludge disposal standards.
The sludge has the dual properties of pollution and resource, and the conversion of the sludge into a catalytic material for water purification is a very promising method, so that the effective treatment of the sludge and the effective utilization of water resources can be realized simultaneously. However, fenton-like reaction has high requirements on the activity and stability of the catalyst, and the development of the catalyst is hindered by the problems of low catalytic activity, complex preparation method and the like of the traditional carbon material; meanwhile, the sludge has complex components and a structure which is difficult to regulate and control, so that the sludge is difficult to be efficiently utilized. Therefore, development of an effective strategy for converting sludge into a high-activity and high-stability catalytic material for a water treatment process is urgently needed, and two major obstacles of water resource shortage and sludge difficult to treat are solved.
Hydrothermal carbonization is a conventional process for processing raw materials into high-activity carbonaceous materials by taking water as a medium. By this green strategy, the sludge has better properties than the original sludge, such as stronger metal coordination and rich functional groups. Furthermore, simple high temperature heat treatment is another potential alternative to the reuse of large amounts of sludge, which can achieve the performance of typical carbon-based catalysts. It is worth noting that the precursor of the sewage sludge derived carbon material produced by different treatment modes can carry out fine control on the structure and the composition of the precursor, thereby realizing the effective regulation and control of the electronic structure. In fact, the effect of the difference in electron coordination structure caused by the precursor difference may also improve performance by thermally generating a multi-site catalyst. The sludge derived carbon material has been of unprecedented interest because of its advantages of low cost of preparation, simple operation, etc. It has been reported that defect engineering is an effective means for regulating and controlling the electronic structure of the catalyst, and the introduction of the defect engineering can further improve the activity of metal base sites, thereby being beneficial to improving the catalytic activity. Therefore, by utilizing the technology of combining hydrothermal carbonization and pyrolysis, the controllable synthesis of the high-performance sludge derived carbon catalyst is expected to be realized, and the feasibility of the efficient Fenton-like reaction of the sludge-based catalyst is further proved, so that the sludge-water co-treatment is expected to be realized.
Disclosure of Invention
The invention aims to provide defect-assisted iron-containing sludge derived carbon for efficient persulfate catalysis and a preparation method thereof.
The technical scheme for realizing the purpose of the invention is as follows: a defect-assisted iron-containing sludge derived carbon for high-efficiency persulfate catalysis and a preparation method thereof specifically comprise the following steps:
step 1, blending fine powdery sludge and a precursor containing oxygen or nitrogen functional groups in water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid;
step 2, carrying out hydrothermal carbonization on the hydrothermal carbonization precursor liquid obtained in the step 1 to obtain a sludge derivative hydrothermal carbon material doped with functional groups;
step 3, the sludge derived hydrothermal carbon material with the doped functional group obtained in the step 2 is treated in N 2 Carbonizing at 900 ℃ in the atmosphere to obtain the defect-assisted iron-containing sludge derived carbon.
Preferably, in the step 1, the fine powdery sludge is obtained by placing the sludge in an oven at 100-110 ℃ for 3 days to completely dehydrate and dry the sludge, crushing the dried sludge and sieving the crushed sludge with a 60-mesh sieve.
Preferably, in the step 1, the concentration of the fine powdery sludge in water is 100-140 g/L.
Preferably, in the step 1, the oxygen-containing or nitrogen-containing functional group compound is selected from any one of phenol, hydroquinone, p-aminophenol, aniline, p-phenylenediamine and the like, and the concentration thereof in water is 160-200 mmol/L.
Preferably, in the step 2, the hydrothermal carbonization temperature is 160-220 ℃ and the hydrothermal carbonization time is 4-24 h.
Preferably, in the step 3, the temperature rising rate is 3-8 ℃/min, and the heat preservation time is 60-180 min.
Compared with the prior art, the method is simple and controllable, the prepared defect-assisted iron-containing sludge derived carbon can simultaneously realize effective treatment of sludge and effective utilization of water resources, and has a wider pH range and higher catalytic activity in various water matrixes. Therefore, the method has great application potential in the aspects of sludge recycling and sewage treatment.
Drawings
FIG. 1 is a schematic representation of the preparation of defective auxiliary iron-containing sludge derived carbon of comparative example 2 and example 1.
Fig. 2 is a solid state electron paramagnetic resonance diagram of the defect-assisted iron-containing sludge derived carbon of comparative examples 1, 2 and example 1.
Fig. 3 is an experiment of the catalytic degradation of bisphenol a by the carbon derived from the defect-assisted iron-containing sludge of comparative examples 1, 2 and example 1.
FIG. 4 is a schematic diagram of the application of the defect-assisted iron-containing sludge derived carbon of example 2 to an actual filtration plant.
Detailed Description
The invention is further described below with reference to examples and figures.
The invention prepares the sludge into derivative hydrothermal carbon materials doped with different functional groups through a hydrothermal and pyrolysis combined technology, and obtains the defect-assisted iron-containing sludge derivative carbon through carbonization. The sludge derived carbon prepared by the method has a synergistic effect of double functional sites and a porous structure, and is more beneficial to generating active sites, so that the removal efficiency of persulfate on micro pollutants in water is improved.
Comparative example 1
Step 1, placing 500 g sludge in a 105 ℃ oven for 3 days to completely dehydrate and dry, crushing the dried sludge by using a high-speed universal crusher, and collecting the crushed sludge by a 60-mesh screen to obtain fine powder sludge;
step 2, the dried and sieved sludge powder obtained in the step 1 is treated in N 2 Carbonizing at 900 ℃ under atmosphere, wherein the heating rate is 5 ℃/min, and obtaining the iron-containing sludge derived carbon which is named DSC.
Comparative example 2
Step 1, placing 500 g sludge in a 105 ℃ oven for 3 days to completely dehydrate and dry, crushing the dried sludge by using a high-speed universal crusher, and collecting the crushed sludge by a 60-mesh screen to obtain fine powder sludge;
step 2, dissolving the dried and sieved sludge powder 3 g obtained in the step 1 in 25 mL water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid;
step 3, transferring the hydrothermal carbonization precursor liquid obtained in the step 2 into a 50 mL polytetrafluoroethylene reaction kettle liner, and obtaining a sludge derived hydrothermal carbon material by utilizing a high-temperature high-pressure hydrothermal condition at 200 ℃ for 4 h;
step 4, the sludge derived water thermal carbon material obtained in the step 3 is treated in N 2 Carbonizing at 900 ℃ under the atmosphere, and obtaining the defect-assisted iron-containing sludge derived carbon named DHSC, wherein the heating rate is 5 ℃/min.
Example 1
Step 1, placing 500 g sludge in a 105 ℃ oven for 3 days to completely dehydrate and dry, crushing the dried sludge by using a high-speed universal crusher, and collecting the crushed sludge by a 60-mesh screen to obtain fine powder sludge;
step 2, respectively blending the dried and sieved sludge powder 3 g obtained in the step 1 with 4.5 mmol of hydroquinone, aniline and p-phenylenediamine in 25 mL water, stirring until the mixture is uniform, and sequentially obtaining three hydrothermal carbonization precursor solutions;
step 3, transferring the hydrothermal carbonization precursor liquid obtained in the step 2 into a 50 mL polytetrafluoroethylene reaction kettle liner respectively, and obtaining a sludge derived hydrothermal carbon material by utilizing a high-temperature high-pressure hydrothermal condition at 200 ℃ for 4 h;
step 4, respectively putting the sludge derived water thermal carbon material obtained in the step 3 in N 2 Carbonizing at 900 ℃ under the atmosphere, and heating at a speed of 5 ℃/min to obtain the auxiliary iron-containing sludge derived carbon with different defects, which are named DHSC-O, DHSC-1N and DHSC-2N respectively.
Fig. 1 is a flow chart of the preparation of comparative example 2 and example 1, and in fig. 1, it can be seen that sludge-derived carbon doped with different functional groups is obtained by controlling the kind of oxygen/nitrogen-containing precursor compound, and iron-containing sludge-derived carbon materials with different defects are prepared by further pyrolysis. Fig. 2 is a solid state electron paramagnetic resonance plot of the samples prepared in comparative examples 1, 2 and example 1, and it can be seen in fig. 2 that the synthesized derivatized carbon material has an adjustable degree of defects.
Example 2
Step 1, placing 500 g sludge in a 105 ℃ oven for 3 days to completely dehydrate and dry, crushing the dried sludge by using a high-speed universal crusher, and collecting the crushed sludge by a 60-mesh screen to obtain fine powder sludge;
step 2, blending the dried and sieved sludge powder 6 g obtained in the step 1 and 9.0 mmol of p-phenylenediamine in 50 mL of water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid;
step 3, transferring the hydrothermal carbonization precursor liquid obtained in the step 2 into a lining of a 100 mL polytetrafluoroethylene reaction kettle, and obtaining a sludge derived hydrothermal carbon material by utilizing a high-temperature high-pressure hydrothermal condition at a temperature of 200 ℃ and a reaction time of 4 h;
step 4, the sludge derived water thermal carbon material obtained in the step 3 is treated in N 2 Carbonizing at 900 ℃ in the atmosphere, and heating at a rate of 5 ℃/min to obtain the defect-assisted iron-containing sludge derived carbon.
Example 3
Step 1, placing 500 g sludge in a 105 ℃ oven for 3 days to completely dehydrate and dry, crushing the dried sludge by using a high-speed universal crusher, and collecting the crushed sludge by a 60-mesh screen to obtain fine powder sludge;
step 2, blending the dried and sieved sludge powder 3 g obtained in the step 1 and 4.5 mmol p-phenylenediamine in 25 mL water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid;
step 3, transferring the hydrothermal carbonization precursor liquid obtained in the step 2 into a 50 mL polytetrafluoroethylene reaction kettle liner, and obtaining a sludge derived hydrothermal carbon material by utilizing high-temperature high-pressure hydrothermal conditions, wherein the temperature is 200 ℃ and the reaction time is 24 h;
step 4, the sludge derived water thermal carbon material obtained in the step 3 is treated in N 2 Carbonizing at 900 ℃ in the atmosphere, and heating at a rate of 3 ℃/min to obtain the defect-assisted iron-containing sludge derived carbon.
The defective auxiliary iron-containing sludge derived carbons (DSC, DHSC, DHSC-O, DHSC-1N, DHSC-2N) in comparative examples 1, 2 and example 1 were used to catalyze the persulfate to degrade bisphenol A (BPA), an organic contaminant.
The performance of activated persulfate to degrade bisphenol A (BPA) was tested using a high performance liquid chromatograph from Watership technologies (Shanghai) Inc. Waters Alliance HPLC. First, a 20 ppm solution of BPA 100 mL was prepared and 15 mg persulfate was added to the solution of BPA using the different defect-assisted iron-containing sludge derived carbon 5 mg prepared as a catalyst. As shown in FIG. 3, DHSC-2N of 5 mg was almost completely degradable to BPA solution at an initial concentration of 20 ppm under room temperature conditions within 10 min; the degradation efficiency of DHSC-1N and DHSC of 5 mg is up to 90% in 20 min under the same condition; the DSC of comparative sample 1 was only degraded by 70%.
The defect-assisted iron-containing sludge derived carbon of example 2 was placed in a filtration unit for catalyzing the persulfate to degrade organic contaminants BPA.
As shown in fig. 4, the prepared defect-assisted iron-containing sludge derived carbon is placed in a filtering device, and BPA solution and persulfate solution are simultaneously fed into a clean beaker from top to bottom through a filtering device filled with materials by a peristaltic pump, and after 20 h, the degradation effect is still good.
Claims (8)
1. The preparation method of the defect-assisted iron-containing sludge derived carbon is characterized by comprising the following specific steps of:
step 1, blending fine powdery sludge and a precursor containing oxygen or nitrogen functional groups in water, and stirring until the mixture is uniform to obtain a hydrothermal carbonization precursor liquid;
step 2, carrying out hydrothermal carbonization on the hydrothermal carbonization precursor liquid obtained in the step 1 to obtain a sludge derivative hydrothermal carbon material doped with functional groups;
step 3, the sludge derived hydrothermal carbon material with the doped functional group obtained in the step 2 is treated in N 2 Carbonizing at 900 ℃ in the atmosphere to obtain the defect-assisted iron-containing sludge derived carbon.
2. The method according to claim 1, wherein in step 1, the fine powdery sludge is obtained by completely dehydrating and drying the sludge by placing the sludge in an oven at 100 to 110 ℃ for 3 days, and pulverizing the dried sludge and sieving the pulverized sludge with a 60-mesh sieve.
3. The method according to claim 1, wherein in step 1, the concentration of the fine powdery sludge in water is 100-140 g/L.
4. The method according to claim 1, wherein in step 1, the oxygen-or nitrogen-containing functional compound is selected from any one of phenol, hydroquinone, p-aminophenol, aniline, and p-phenylenediamine, and has a concentration of 160 to 200 mmol/L in water.
5. The method of claim 1, wherein in step 2, the hydrothermal carbonization temperature is 160-220 ℃ and the hydrothermal carbonization time is 4-24 h.
6. The method according to claim 1, wherein in step 3, the temperature rising rate is 3-8 ℃/min and the temperature holding time is 60-180 min.
7. A defective auxiliary iron-containing sludge derived carbon prepared according to the method of any one of claims 1-6.
8. Use of a defective auxiliary iron-containing sludge derived carbon prepared according to the method of any one of claims 1-6 for efficient persulfate catalysis.
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