CN103418341B - Method for preparing activated carbon used for liquid phase adsorption - Google Patents
Method for preparing activated carbon used for liquid phase adsorption Download PDFInfo
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- CN103418341B CN103418341B CN201310335614.0A CN201310335614A CN103418341B CN 103418341 B CN103418341 B CN 103418341B CN 201310335614 A CN201310335614 A CN 201310335614A CN 103418341 B CN103418341 B CN 103418341B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 12
- 239000007791 liquid phase Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005406 washing Methods 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 12
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 32
- 239000008187 granular material Substances 0.000 claims description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000008139 complexing agent Substances 0.000 claims description 10
- 239000006249 magnetic particle Substances 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 229910021645 metal ion Inorganic materials 0.000 claims 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- 229910002651 NO3 Inorganic materials 0.000 claims 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- 238000003980 solgel method Methods 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000012266 salt solution Substances 0.000 abstract 1
- 239000003575 carbonaceous material Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 235000015165 citric acid Nutrition 0.000 description 9
- 238000012216 screening Methods 0.000 description 9
- 239000003643 water by type Substances 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003610 charcoal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- RIVZIMVWRDTIOQ-UHFFFAOYSA-N cobalt iron Chemical compound [Fe].[Co].[Co].[Co] RIVZIMVWRDTIOQ-UHFFFAOYSA-N 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 238000011953 bioanalysis Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002363 herbicidal effect Effects 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Abstract
A method for preparing activated carbon used for liquid phase adsorption relates to a method for preparing magnetic activated carbon. The activated carbon used for liquid phase adsorption is formed by compounding activated carbon and magnetic material, and functional activated carbon can be separated in a liquid phase environment depending on an external magnetic field. The method comprises the following steps: 1, modifying the surfaces of activated carbon particles; 2, taking the activated carbon particles as a carrier, preparing two or more than two metal salt solutions according to a certain proportion, and stirring well; 3, dripping a certain amount of a citric acid complexant, mixing well, dripping ammonia water to regulate the pH of the solution to a certain value, and stirring to form collosol; 4, drying the collosol in certain temperature to form gel; 5, sintering under the protection of nitrogen; 6, magnetically separating, washing and drying. The method has the advantages that the load of a small amount of magnetic material can not influence the adsorption characteristics of activated carbon but can enable the activated carbon to be magnetic, and harmful impurities absorbed under liquid phase condition can be reclaimed and reused through an external magnetic field.
Description
Technical field
The present invention relates to a kind of preparation method of magnetic active carbon of liquid phase adsorption.
Background technology
At present in the advanced treating and trade effluent recycling project of Drinking Water; often can encounter and remove the heavy metal ion in former water, organic and inorganic pollution how simply, effectively, economically, reduce the problem such as COD (COD) and peculiar smell in former water.Active carbon is one of adsorbent of extensive use in water treatment absorption method, and it is a kind of charcoal through specially treated, and have countless tiny hole, surface area is huge.The surface area of every gram of active carbon is 500 square metres ~ 1500 square metres.Active carbon has very strong physical absorption and chemisorbed function, but also has detoxication.Detoxication is exactly make use of its huge area, is adsorbed in the micropore of active carbon by poisonous substance, thus stops the absorption of poisonous substance.Active carbon can be combined with number of chemical material simultaneously, thus stops the absorption of these materials.
Active carbon has remarkable characterization of adsorption to Organic substance in water.Because active carbon has flourishing pore structure and huge specific area, therefore to the organic pollution dissolved in water, as benzene-like compounds, phenolic compound, oil and oil product etc. have stronger adsorption capacity, and to the organic pollution being difficult to bioanalysis and other chemical method remove, the organic compound etc. as colourity, foreign odor, methylenum careuleum surface reactive material, herbicide, pesticide, agricultural chemicals, synthetic detergent, synthetic dyestuffs, aminated compounds and many Prof. Du Yucang has good removal effect.Active carbon also has stronger adsorption capacity to some heavy metal compound.As mercury, lead, iron, nickel, chromium, zinc, cobalt etc., therefore, active carbon also has good effect in electroplating wastewater, smelting wastewater process.
Saturated activity charcoal can be reused after regeneration, does not produce secondary pollution.How to reclaim the focus that saturated active carbon in sewage becomes research at present.The present invention relates to a kind of preparation method of magnetic active carbon material, at a small amount of magnetic material of duct internal burden of active carbon, by the effect of external magnetic field, active carbon can be separated from the aqueous solution, ensure the recycling of active carbon Related product.
Summary of the invention
The object of this invention is to provide a kind of magnetic active carbon material and preparation method thereof, at a small amount of magnetic material of duct internal burden of active carbon, by the effect of external magnetic field, active carbon can be separated from the aqueous solution, active carbon and carried magnetic quality of materials are than being 20:(1 ~ 8), can according to external magnetic field strong and weak regulating load amount.
A preparation method for magnetic active carbon material, specifically completes according to the following steps: one, activated carbon powder is broken into activated carbon granule, utilizes 200 mesh sieve screenings; Two, adopt the concentrated sulfuric acid or red fuming nitric acid (RFNA) to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry; Three, active carbon, two or more slaine are fully dissolved in deionized water and alcohol mixed solution according to a certain percentage; Four, drip a certain amount of citric acid complexing agent, drip ammoniacal liquor after fully mixing and regulate pH value of solution to certain value, and stir formation colloidal sol; Five, gel is formed by dry at a certain temperature for colloidal sol; Six, gel sinters under nitrogen protection; Seven, through Magneto separate, washing and drying, magnetic-particle supported active Carbon Materials is obtained.
Advantage of the present invention: one, the microstructure of active carbon is not almost destroyed, simple to operate, cost is low; Two, the load of a small amount of magnetic material can not affect the absorption property of active carbon, make active carbon have magnetic simultaneously, can be undertaken extracting or being separated by external magnetic field after charcoal absorption pernicious gas and sewage impurity, be conducive to the recycling realizing active carbon and Related product.
Accompanying drawing explanation
Prepared ferro-cobalt/Conjugate ferrite/absorbent charcoal composite material according to detailed description of the invention 1, wherein Fig. 1 is the XRD collection of illustrative plates of the ferro-cobalt/Conjugate ferrite/active carbon of experiment synthesis; Fig. 2 is the VSM curve of the ferro-cobalt/Conjugate ferrite/active carbon of synthesis; Fig. 3 is magnetic active carbon external magnetic field response condition photo, is magnetic active carbon is placed in alcohol the response condition of observing its external magnetic field in picture.
Detailed description of the invention
Detailed description of the invention 1: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 1 part of Co (NO
3)
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 0.5 part of citric acid as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=3, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 2: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 1 part of MnCl
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 2 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=5, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 500 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 3: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt red fuming nitric acid (RFNA) to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 1 part of Zn (NO
3)
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 2 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=7, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 500 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 4: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 0.5 part of MnCl
26H
2o, 0.5 part of ZnCl
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 3 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=7, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 5: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 0.5 part of NiCl
26H
2o, 0.5 part of Zn (NO
3)
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 3 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=7, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 6: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 30 parts of active carbons, 1 part of BaCl
26H
2o and 12 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 24 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=7, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 7: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 1 part of Cu (NO
3)
23H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 4 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=7, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Detailed description of the invention 8: first activated carbon powder is broken into activated carbon granule, after utilizing 200 mesh sieve screenings; Adopt the concentrated sulfuric acid to carry out surface modification to activated carbon granule, abundant washing (pH=7) is also dry.Get 4 parts of active carbons, 0.5 part of Cu (NO
3)
23H
2o, 0.5 part of Zn (NO
3)
26H
2o and 2 part of Fe (NO
3)
39H
2o is dissolved in the mixed solution of 20 parts of ionized waters and 15 parts of alcohol, stirs 2 hours at 60 DEG C of lower magnetic forces.Then dropwise drip 4 parts of citric acids as complexing agent, drip ammoniacal liquor after stirring 5h and regulate pH value of solution=4, regulate bath temperature to 70 DEG C, being stirred to solution becomes collosol state.Gained colloidal sol to be transferred in air dry oven dry 3h at 250 DEG C, obtain gel.Under nitrogen protection, gel is placed in 700 DEG C, tube furnace sintering 3h.Through Magneto separate, washing (pH=7) and drying, obtain magnetic-particle supported active Carbon Materials.
Claims (2)
1. the preparation method of a liquid phase adsorption active carbon, it is characterized in that the duct internal burden magnetic-particle at active carbon, its preparation method adopts sol-gel process synthesis, concrete steps are as follows: one, adopt the concentrated sulfuric acid or red fuming nitric acid (RFNA) to carry out surface modification to activated carbon granule, fully washing is also dry; Two, active carbon and two kinds or more slaine is fully dissolved in deionized water and alcohol mixed solution according to a certain percentage; Three, drip citric acid complexing agent, citric acid and total metal ion mol ratio are 0.5 ~ 4, drip ammoniacal liquor and regulate pH value of solution to 4 ~ 7 after fully mixing, and stir formation colloidal sol; Four, gel is formed by dry at 120 DEG C ~ 250 DEG C for colloidal sol; Five, gel 400 DEG C under nitrogen protection ~ 800 DEG C sintering 1 ~ 3h; Six, through Magneto separate, washing and drying, a kind of liquid phase adsorption active carbon is obtained.
2. the preparation method of a kind of liquid phase adsorption active carbon according to claim 1, is characterized in that: the slaine of employing is chloride, nitrate and sulfate, and metal ion is Ni
2+, Fe
2+, Co
2+, Mn
2+, Ba
2+, Zn
2+, Cu
2+.
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| CN107551673A (en) * | 2017-08-10 | 2018-01-09 | 深圳沃海森科技有限公司 | Antibacterial filter core used for automobile air conditioning and its preparation technology |
| CN109731550A (en) * | 2019-03-21 | 2019-05-10 | 中国计量大学 | It is a kind of can Magneto separate absorbent charcoal composite material preparation method |
| CN110233060B (en) * | 2019-04-30 | 2021-06-22 | 杭州星宇炭素环保科技有限公司 | Active carbon metal oxide electrode material and its synthesis process |
| CN110302800B (en) * | 2019-04-30 | 2022-03-11 | 杭州星宇炭素环保科技有限公司 | Synthesis process of catalyst activated carbon composite material for decomposing dioxin |
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| CN101475367A (en) * | 2009-01-22 | 2009-07-08 | 中国计量学院 | Preparation of nanometer-level barium ferrite magnetic material |
| CN101683624A (en) * | 2008-09-27 | 2010-03-31 | 中国科学院大连化学物理研究所 | Control method for carrying metal particles in carbon nanotube cavity or on external wall |
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| CN101683624A (en) * | 2008-09-27 | 2010-03-31 | 中国科学院大连化学物理研究所 | Control method for carrying metal particles in carbon nanotube cavity or on external wall |
| CN101475367A (en) * | 2009-01-22 | 2009-07-08 | 中国计量学院 | Preparation of nanometer-level barium ferrite magnetic material |
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