CN111215069A - Biological mesoporous carbon-supported iron oxide and application thereof - Google Patents
Biological mesoporous carbon-supported iron oxide and application thereof Download PDFInfo
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims description 62
- 241000209094 Oryza Species 0.000 claims abstract description 33
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 33
- 235000009566 rice Nutrition 0.000 claims abstract description 33
- 239000003054 catalyst Substances 0.000 claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 7
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000010000 carbonizing Methods 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000000975 dye Substances 0.000 claims description 24
- 230000015556 catabolic process Effects 0.000 claims description 19
- 238000006731 degradation reaction Methods 0.000 claims description 19
- 230000000593 degrading effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- XWZDJOJCYUSIEY-UHFFFAOYSA-L disodium 5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].Oc1c(N=Nc2ccccc2)c(cc2cc(cc(Nc3nc(Cl)nc(Cl)n3)c12)S([O-])(=O)=O)S([O-])(=O)=O XWZDJOJCYUSIEY-UHFFFAOYSA-L 0.000 claims description 7
- 238000000197 pyrolysis Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000009656 pre-carbonization Methods 0.000 claims description 4
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 claims description 4
- 229940043267 rhodamine b Drugs 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 25
- 238000004042 decolorization Methods 0.000 abstract description 20
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 239000002638 heterogeneous catalyst Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000002351 wastewater Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910005084 FexOy Inorganic materials 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- POJOORKDYOPQLS-UHFFFAOYSA-L barium(2+) 5-chloro-2-[(2-hydroxynaphthalen-1-yl)diazenyl]-4-methylbenzenesulfonate Chemical compound [Ba+2].C1=C(Cl)C(C)=CC(N=NC=2C3=CC=CC=C3C=CC=2O)=C1S([O-])(=O)=O.C1=C(Cl)C(C)=CC(N=NC=2C3=CC=CC=C3C=CC=2O)=C1S([O-])(=O)=O POJOORKDYOPQLS-UHFFFAOYSA-L 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000003917 TEM image Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000007269 microbial metabolism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- B01J37/08—Heat treatment
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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
- 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
- B01J37/16—Reducing
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- 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
- C02F1/722—Oxidation by peroxides
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- 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
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- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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Abstract
The invention discloses a biological mesoporous carbon iron-carrying oxide and application thereof, wherein the biological mesoporous carbon iron-carrying oxide is obtained by washing rice roots with deionized water, drying, pre-carbonizing at 250-400 ℃ for 3.5-4.5 h, heating to 500-900 ℃ at a heating rate of 5-15 ℃/min under the protection of nitrogen, and pyrolyzing for 3.5-4.5 h. The biological mesoporous carbon-supported oxide heterogeneous Fenton-like catalyst is prepared by utilizing a rice root system, the problem that the iron-based Fenton-like heterogeneous catalyst is fast in loss is solved, the reusability is better, and the catalyst can be recycled. The decolorization rate of the organic dye reaches 99.23 percent.
Description
(I) technical field
The invention relates to a novel method for preparing biological mesoporous carbon-supported iron oxide by using rice roots and using the biological mesoporous carbon-supported iron oxide as a heterogeneous Fenton-like catalyst for decoloring and degrading dye wastewater.
(II) background of the invention
Biochar (Biochar) is an emerging solid carbon material, which is defined as "a product with a high carbon content produced by pyrolysis of biomass in a closed container under anaerobic or low-oxygen conditions", and is a porous carbonaceous solid obtained by thermochemical conversion of organic substances in a low-oxygen atmosphere, and its physicochemical properties are suitable for long-term storage of carbon in the environment. The effectiveness of biochar in pollution treatment depends on its surface area, pore size distribution and ion exchange capacity, its physical structure and molecular composition being crucial for practical applications in soil and water. The rice root system iron membrane has excellent development potential as a unique characteristic which is often ignored by people.
The porous carbon is an excellent catalyst carrier, has the characteristics of large specific surface area and good adsorption performance, and has wide application in wastewater treatment at present. Research shows that the heterogeneous Fenton-like catalyst prepared by using porous carbon as a carrier shows excellent performance. The supported iron catalyst is prepared by supporting active components (zero-valent iron and iron oxide) in a porous material. Due to the uniform pore channel structure and the higher specific surface area of the porous material, the active component is uniformly distributed in the porous material to prevent agglomeration. Meanwhile, the porous structure provides a large number of active sites for reactants, increases the contact area of the inner surface of the reactants, effectively reduces the dissolution of effective components through the physical and chemical interaction between the active components and the carrier, improves the stability of the catalyst and is beneficial to the reutilization of the catalyst.
The rice root raw material is agricultural waste, is never utilized, has wide source and huge resource amount. The iron oxide film on the surface of the rice root is from complex rhizosphere microbial metabolism in the growth process of rice and is biological enrichment of soil iron elements to the root system of the rice. The rice root and the iron oxide film on the surface of the rice root can be used for preparing the heterogeneous Fenton catalyst by a very simple pyrolysis method, can be used for degrading dye wastewater, have a good loading effect on active components due to the fact that the surface of the material has rich micropore/mesoporous structures, slow down the loss of the active components, and have better repeated use capability compared with a common catalytic material.
Disclosure of the invention
The invention aims to provide a method for preparing biological mesoporous carbon-supported iron oxide by using rice roots and using the biological mesoporous carbon-supported iron oxide as a heterogeneous Fenton-like catalyst for decoloring and degrading dye wastewater.
The technical scheme adopted by the invention is as follows:
the invention provides a biological mesoporous carbon iron-carrying oxide, which is prepared by the following method: washing the rice roots with deionized water, and drying at 50-150 ℃ for 3.5-4.5 hours to obtain air-dried rice roots; cutting the air-dried rice roots into small pieces, and pre-carbonizing the rice roots in a muffle furnace at 250-400 ℃ for 3.5-4.5 h to obtain pre-carbonized rice roots; and (3) heating the pre-carbonized rice roots in a tubular furnace at a heating rate of 5-15 ℃/min to 500-900 ℃ under the protection of nitrogen, pyrolyzing the rice roots at the constant temperature of 500-900 ℃ for 3.5-4.5 hours, and collecting black powder, namely the biological mesoporous carbon iron-carrying oxide.
Further, it is preferable that the drying is performed in an oven at 105 ℃ for 24 hours.
Further, the pre-carbonization condition is preferably pre-carbonization at 250 ℃ for 3.5-4.5 h.
Further, the temperature increase rate is preferably 5 ℃/min. The preferred pyrolysis conditions are constant temperature pyrolysis at 700 ℃ for 4 hours.
The invention also provides an application of the biological mesoporous carbon-supported iron oxide in degradation of organic dyes, which comprises the following steps: taking the biological mesoporous carbon-supported iron oxide as a heterogeneous Fenton-like catalyst, and adding an organic dye and H2O2Forming a degradation system with deionized water, adjusting the pH to 2.5-4.5, and degrading the organic dye at the temperature of 34-36 ℃; h in the degradation system2O2The adding amount is 1.5-3.5 mmol/L, the adding amount of the catalyst is 0.4-0.8 g/L, and the concentration of the dye is 95-105 mg/L; the organic dye includes active brilliant red X-3B and rhodamineB。
Further, it is preferable that H in the degradation system is H2O2The adding amount is 2.5mmol/L, the adding amount of the catalyst is 0.6g/L, and the dye concentration is 100 mg/L.
Further, it is preferable that the degradation temperature is 35 ℃ and the pH is 3.5.
Compared with the prior art, the invention has the following beneficial effects: the biological mesoporous carbon-supported oxide heterogeneous Fenton-like catalyst is prepared by utilizing a rice root system, the problem that the iron-based Fenton-like heterogeneous catalyst is fast in loss is solved, the reusability is better, and the catalyst can be recycled. After the reaction is carried out for 60 minutes, the decolorization rate of the organic dye reaches 99.23 percent, and TOC can be degraded from 9.5mg/L to 5.6 mg/L.
(IV) description of the drawings
FIG. 1 is an XRD diffraction pattern of the bio-mesoporous iron-supported carbon oxide prepared in example 1.
FIG. 2 is a TEM image of the biocellular carbon-supported iron oxide prepared in example 1, and the low-magnification (a) and high-magnification (b) TEM images of the biocellular carbon-supported iron oxide obtained under the constant temperature pyrolysis condition of 700 ℃ and the elemental composition analysis thereof, iron element, silicon element and oxygen element (c-f).
FIG. 3 is a graph showing the decolorization rate and TOC degradation effect of the biological mesoporous carbon supported iron oxide prepared in example 1 as a heterogeneous Fenton-like catalyst for degrading reactive brilliant red X-3B.
FIG. 4 is a graph showing the decolorization rate and TOC degradation effect of the dye rhodamine B degraded by using the biological mesoporous carbon supported iron oxide as the heterogeneous Fenton-like catalyst in example 2.
FIG. 5 is a graph showing the decolorization rate and TOC degradation effect of the biological mesoporous carbon supported iron oxide as a heterogeneous Fenton-like catalyst for degrading dye reactive brilliant red X-3B in example 3.
FIG. 6 is an XRD diffractogram of the bio-mesoporous iron-on-carbon oxide prepared in example 4.
FIG. 7 is a graph showing the decolorization rate and TOC degradation effect of the biological mesoporous carbon supported iron oxide as a heterogeneous Fenton-like catalyst in example 4 for degrading dye reactive brilliant red X-3B.
(V) detailed description of the preferred embodiments
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
example 1
1. Biological mesoporous carbon-supported iron oxide nano material
Rice roots (underground parts) were washed with deionized water and dried in an oven at 105 ℃ for 24 hours, stored in a desiccator until use; cutting 1.0g of the air-dried rice root sample into small pieces, and pre-carbonizing the small pieces in a muffle furnace at 250 ℃ for 4 hours; heating the pre-carbonized rice root sample to 700 ℃ in a tubular furnace under the protection of nitrogen (the heating rate is 5 ℃/min), pyrolyzing the rice root sample at the constant temperature of 700 ℃ for 4 hours, and collecting obtained black powder, namely 0.1g of biological mesoporous carbon-supported iron oxide, which is recorded as FexOyand/BC-700. The XRD diffractogram is shown in FIG. 1, and Fe can be seen after comparing PDF standard cardsxOythe/BC-700 has three phases of SiO2(JCPDSNo.12-0708)、Fe(JCPDS No.06-0696)、Fe2O3(JCPDS No.16-0653), and therefore Fe can be consideredxOyThe BC-700 has Fe and Fe at the same time2O3The Fe content in the rice root biochar at 700 ℃ is illustrated2O3Has been reduced at high temperature by the action of C and has a part of Fe2O3Reduced to the form of elementary substance Fe according to Fe2O3The route of reduction is judged to be FexOyFe is also contained in the/BC-7003O4Is present. The TEM image is shown in FIG. 2, and the high resolution TEM image at 5nm is calculated to calculate the lattice spacing, which is 0.252nm compared with the classical Fe2O3The data can judge and determine that the Fe belongs to2O3A crystalline form.
2. Dye wastewater decolorization and degradation experiment
The biological mesoporous carbon supported iron oxide obtained in the step 1 is used as a heterogeneous Fenton-like catalyst for degrading dye (active brilliant red X-3B) wastewater, and specifically comprises the following steps: the biological mesoporous carbon-carried iron oxide Fe obtained in the step 1xOythe/BC-700 is heterogeneous Fenton-like catalyst, and H is added2O2Reactive brilliant red X-3B and deionized water form a reaction system with the pH value of 3.5, wherein H2O2The dosage is 2.5mmol/L, FexOyThe addition amount of the/BC-700 is 0.6g/L, and the concentration of the reactive brilliant red X-3B is 100 mg/L; after reacting for 60 minutes at 35 ℃, sampling and testing the light absorption value at 535nm, calculating the decolorization rate according to the formula (1), simultaneously testing the concentration of organic matters (TOC) by using a total organic carbon analyzer TOC-L (Shimadzu corporation, Japan, the measurement range is less than 20mg/L), testing each sample for 3 times, and taking the average value, wherein the decolorization rate is as high as 99.23% after reacting for 60 minutes, as shown in figure 3.
A0The reaction system before the reaction is at an absorbance of 535 nm;
At-absorbance of the reaction solution at a wavelength of 535nm after a reaction time t;
p- -decolorization ratio.
Example 2 decolorization and degradation experiment of dye wastewater
The reactive brilliant red X-3B in the step 2 of the example 1 is changed into rhodamine B, the light absorption value of the rhodamine B is detected at the position with the wavelength of 554nm, the decolorization rate and the TOC degradation effect are shown in the figure 4 in other examples 1, and the decolorization rate is up to 95.51 percent after the reaction is carried out for 60 minutes.
Example 3 decolorization and degradation experiment of dye wastewater
The pH value in step 2 of example 1 was changed to 4.0, and the decolorization rate and TOC degradation effect after 60 minutes of reaction are shown in FIG. 5 in the same manner as in example 1, and the decolorization rate is up to 93.41%.
Example 4
1. Biological mesoporous carbon supported iron oxide
Washing rice roots with deionized water and drying in an oven at 105 ℃ for 24 hours, storing in a desiccator until use; cutting 1.0g of the air-dried rice root sample into small pieces, and pre-carbonizing the small pieces in a muffle furnace at 250 ℃ for 4 hours; heating the pre-carbonized rice root sample in a tubular furnace under the protection of nitrogen to 900 deg.C (the heating rate is 5 deg.C/min), and heating at 900 deg.CDecomposing for 4 hours, and collecting the obtained black powder, namely 0.1g of biological mesoporous carbon-supported iron oxide nano material, and marking as FexOyand/BC-900. The XRD diffractogram is shown in FIG. 6, illustrating FexOythe/BC-900 has three phases of SiO2(JCPDS No.12-0708), Fe (JCPDSNo.06-0696) and Fe3O4(JCPDS No.26-1136) similar diffraction peaks, therefore Fe was considered at 900 deg.C2O3The reduction is complete.
2. Dye wastewater decolorization and degradation experiment
The biological mesoporous carbon supported iron oxide obtained in the step 1 is used as a heterogeneous Fenton-like catalyst for degrading dye (active brilliant red X-3B) wastewater, and specifically comprises the following steps: the biological mesoporous carbon-carried iron oxide Fe obtained in the step 1xOythe/BC-900 is heterogeneous Fenton-like catalyst, and H is added2O2Reactive brilliant red X-3B and deionized water form a reaction system with the pH value of 3.5, wherein H2O2The dosage is 2.5mmol/L, FexOyThe dosage of the/BC-900 is 0.6g/L, and the concentration of the reactive brilliant red X-3B is 100 mg/L; after reacting for 60 minutes at 35 ℃, sampling and testing the light absorption value at 535nm, calculating the decolorization rate according to the formula (1), simultaneously testing the concentration of organic matters (TOC) by using a total organic carbon analyzer TOC-L (Shimadzu corporation, Japan, the measurement range is less than 20mg/L), testing each sample for 3 times, and taking the average value, wherein the decolorization rate can reach 89.41% after reacting for 60 minutes, and the result is shown in figure 7.
A0The reaction system before the reaction is at an absorbance of 535 nm;
At-absorbance of the reaction solution at a wavelength of 535nm after a reaction time t;
p- -decolorization ratio.
Claims (10)
1. A biological mesoporous carbon iron-carrying oxide is characterized in that the biological mesoporous carbon iron-carrying oxide is prepared by the following method: washing the rice roots with deionized water, and drying at 50-150 ℃ for 3.5-4.5 hours to obtain air-dried rice roots; cutting the air-dried rice roots into small pieces, and pre-carbonizing the rice roots at 250-400 ℃ for 3.5-4.5 h to obtain pre-carbonized rice roots; and heating the pre-carbonized rice roots to 500-900 ℃ at a heating rate of 5-15 ℃/min under the protection of nitrogen, pyrolyzing at constant temperature for 3.5-4.5 hours, and collecting black powder to obtain the biological mesoporous carbon iron-carrying oxide.
2. The biocellular carbon-supported iron oxide of claim 1, wherein said drying is carried out in an oven at 105 ℃ for 24 hours.
3. The biological mesoporous carbon supported iron oxide according to claim 1, wherein the pre-carbonization condition is pre-carbonization at 250 ℃ for 3.5-4.5 h.
4. The biological mesoporous carbon supported iron oxide according to claim 1, wherein the temperature increase rate is 5 ℃/min.
5. The biocellular carbon-supported iron oxide of claim 1, wherein the pyrolysis is carried out at 700 ℃ for 4 hours.
6. The use of the biological mesoporous carbon supported iron oxide of claim 1 in degradation of organic dyes.
7. The use according to claim 6, characterized in that the method of application is: taking the biological mesoporous carbon-supported iron oxide as a heterogeneous Fenton-like catalyst, and adding an organic dye and H2O2And deionized water to form a degradation system, adjusting the pH to 2.5-4.5, and degrading the dye at the temperature of 34-36 ℃.
8. The method of claim 7, wherein H is in the degradation system2O2The dosage is 1.5-3.5 mmol/L, the dosage of the catalyst is 0.4-0.8 g/L, and the concentration of the dye is 95-105 mg/L.
9. The use of claim 7, wherein all organic dyes comprise reactive brilliant red X-3B, rhodamine B.
10. Use according to claim 7, characterized in that the degradation temperature is 35 ℃ and the pH is 3.5.
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| CN112354532A (en) * | 2020-10-27 | 2021-02-12 | 东北农业大学 | Preparation method and application of zero-valent iron-loaded biochar material |
| CN114984911A (en) * | 2022-06-13 | 2022-09-02 | 陕西学前师范学院 | Preparation method of high-adsorption-performance biochar-nano zero-valent iron compound |
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| CN106853370A (en) * | 2016-08-15 | 2017-06-16 | 上海交通大学 | High stability ordered mesopore carbon load fenton catalyst and its preparation method and application |
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| CN105597724A (en) * | 2015-12-15 | 2016-05-25 | 浙江工业大学 | Method for preparing magnetic-biochar-supported photocatalyst |
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| CN112354532A (en) * | 2020-10-27 | 2021-02-12 | 东北农业大学 | Preparation method and application of zero-valent iron-loaded biochar material |
| CN114984911A (en) * | 2022-06-13 | 2022-09-02 | 陕西学前师范学院 | Preparation method of high-adsorption-performance biochar-nano zero-valent iron compound |
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