CN112452298A - Magnetic biochar composite material and preparation method and application thereof - Google Patents
Magnetic biochar composite material and preparation method and application thereof Download PDFInfo
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- CN112452298A CN112452298A CN202011210005.9A CN202011210005A CN112452298A CN 112452298 A CN112452298 A CN 112452298A CN 202011210005 A CN202011210005 A CN 202011210005A CN 112452298 A CN112452298 A CN 112452298A
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- impregnation liquid
- biomass
- iron
- ions
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- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000003763 carbonization Methods 0.000 claims abstract description 40
- 150000002500 ions Chemical class 0.000 claims abstract description 37
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 28
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 17
- 238000011068 loading method Methods 0.000 claims abstract description 11
- 238000005470 impregnation Methods 0.000 claims description 88
- 239000007788 liquid Substances 0.000 claims description 78
- 239000002028 Biomass Substances 0.000 claims description 76
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 73
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- 239000002994 raw material Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 38
- -1 iron ions Chemical class 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 19
- 229910021645 metal ion Inorganic materials 0.000 claims description 16
- 230000032683 aging Effects 0.000 claims description 15
- 238000012851 eutrophication Methods 0.000 claims description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 13
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000003463 adsorbent Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 238000010000 carbonizing Methods 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 3
- 150000001413 amino acids Chemical class 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 235000013980 iron oxide Nutrition 0.000 claims 2
- 125000003277 amino group Chemical group 0.000 claims 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 35
- 239000002245 particle Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 150000004706 metal oxides Chemical class 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 238000005342 ion exchange Methods 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 239000003575 carbonaceous material Substances 0.000 abstract description 4
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 241000196324 Embryophyta Species 0.000 description 25
- 239000000243 solution Substances 0.000 description 13
- 241000758789 Juglans Species 0.000 description 11
- 235000009496 Juglans regia Nutrition 0.000 description 11
- 235000020234 walnut Nutrition 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 244000205574 Acorus calamus Species 0.000 description 2
- 235000006480 Acorus calamus Nutrition 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 244000060011 Cocos nucifera Species 0.000 description 2
- 235000013162 Cocos nucifera Nutrition 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 244000082204 Phyllostachys viridis Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- 150000002696 manganese Chemical class 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 235000014571 nuts Nutrition 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 244000292211 Canna coccinea Species 0.000 description 1
- 235000005273 Canna coccinea Nutrition 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 240000003826 Eichhornia crassipes Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 240000000599 Lentinula edodes Species 0.000 description 1
- 235000001715 Lentinula edodes Nutrition 0.000 description 1
- 244000211187 Lepidium sativum Species 0.000 description 1
- 235000007849 Lepidium sativum Nutrition 0.000 description 1
- 235000018330 Macadamia integrifolia Nutrition 0.000 description 1
- 240000000912 Macadamia tetraphylla Species 0.000 description 1
- 235000003800 Macadamia tetraphylla Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- JZLUWZPEJDRDEO-UHFFFAOYSA-N [N].C1=CN=CN=C1 Chemical compound [N].C1=CN=CN=C1 JZLUWZPEJDRDEO-UHFFFAOYSA-N 0.000 description 1
- 239000002156 adsorbate Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- AAMATCKFMHVIDO-UHFFFAOYSA-N azane;1h-pyrrole Chemical compound N.C=1C=CNC=1 AAMATCKFMHVIDO-UHFFFAOYSA-N 0.000 description 1
- DLGYNVMUCSTYDQ-UHFFFAOYSA-N azane;pyridine Chemical compound N.C1=CC=NC=C1 DLGYNVMUCSTYDQ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- 229940099607 manganese chloride Drugs 0.000 description 1
- 235000002867 manganese chloride Nutrition 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 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
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention provides a magnetic biochar composite material as well as a preparation method and application thereof, and belongs to the technical field of carbon materials. The preparation method provided by the invention can finish the generation of the biochar, the modification of carbon surface groups and the loading of metal oxide particles by one-step carbonization, has simple operation, low energy consumption and low cost, and is suitable for industrial production; and the prepared magnetic biochar composite material has excellent adsorption effect on heavy metal ions under the synergistic action of surface adsorption, ion exchange and functional group combination.
Description
Technical Field
The invention relates to the technical field of carbon materials, in particular to a magnetic biochar composite material and a preparation method and application thereof.
Background
The pollution of the water body by the heavy metal ions refers to the pollution of the water body caused by the pollutants containing the heavy metal ions entering the water body. Heavy metal wastewater generated in the industrial production processes of mining and metallurgy, mechanical manufacturing, chemical industry, electronics, instruments and the like contains heavy metal ions such as chromium, cadmium, copper, mercury, nickel, zinc and the like. If sludge and waste water containing heavy metal ions are used as fertilizers and for irrigating farmlands, soil can be polluted, heavy metal ions in crops and aquatic organisms can be enriched after the heavy metal ions enter water bodies, and the heavy metal ions are seriously harmful to human bodies through food chains. Therefore, the elimination of heavy metal pollution in water is always a hotspot and a difficulty in the research of the field of environmental governance.
At present, methods for eliminating heavy metal pollution in water mainly comprise membrane treatment, a chemical precipitation method, an ion exchange method, an electrochemical technology, an adsorption technology and the like, but the membrane treatment has the defects of high price, poor mechanical stability and lower transmission performance, the chemical precipitation method and the ion exchange method have poor efficiency for removing low-concentration heavy metal, the electrochemical technology has high energy consumption and high cost, and side reactions such as oxygen evolution, hydrogen evolution and the like are more.
The adsorption technology is widely applied to water pollution treatment by the advantages of simple and convenient operation, reproducible adsorption material, easy control and management and the like. The application of the biochar material in adsorption of heavy metal ions in water is an economic and effective means for treating heavy metal pollution of water, but the adsorption speed and the adsorption quantity of a single biochar material to heavy metals are limited. In order to improve the adsorption rate and the adsorption capacity of the biochar material to heavy metal, the method is mainly carried out by improving the parameters such as the specific surface area, the pore structure and the like of the biochar, enriching functional groups on the surface of the biochar material, loading metal oxide which has chelation or coordination effect on specific heavy metal ions and the like. However, the existing technology generally carries and modifies the biochar composite step by step when synthesizing the biochar composite, and the preparation process is complex.
Disclosure of Invention
The invention aims to provide a magnetic biochar composite material, a preparation method and application thereof. And the prepared magnetic biochar composite material has excellent lead ion adsorption effect.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a magnetic biochar composite material, which comprises the following steps:
placing a biomass raw material into a steeping liquor for steeping to obtain steeped biomass;
drying, aging and carbonizing the impregnated biomass in sequence to obtain a magnetic biochar composite material;
the impregnation liquid comprises a first impregnation liquid or a second impregnation liquid; the first impregnation liquid comprises iron ions and non-iron ions and does not comprise a nitrogen source; the second impregnation liquid comprises a nitrogen source, iron ions and non-iron ions; the non-ferrous metal ions include Mg2+And/or Mn2+；
When the impregnation liquid is the first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in the eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process;
when the impregnation liquid is a first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in a non-eutrophication polluted water area, and ammonia gas is introduced in the carbonization process;
when the impregnation liquid is the second impregnation liquid, the biomass raw material is a biomass material of the aquatic plant in the non-eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process.
Preferably, the nitrogen source in the second impregnation liquid comprises one or more of ammonia, nitrate, nitrite and amino acid.
Preferably, the concentration of the nitrogen source in the second impregnation liquid is 0.05-0.5 mol/L; the concentration of the iron ions in the first impregnation liquid or the second impregnation liquid is 0.1-1 mol/L, and the concentration of the non-iron metal ions in the first impregnation liquid or the second impregnation liquid is 0.1-1 mol/L.
Preferably, the dipping temperature is 20-40 ℃, and the time is 2-8 h;
the dipping is carried out under the ultrasonic condition, and the power of the ultrasonic is 800-1200W.
Preferably, the drying temperature is 40-65 ℃ and the drying time is 12-48 h.
Preferably, the aging temperature is 0-40 ℃, and the aging time is 12-48 h.
Preferably, the carbonization temperature is 300-800 ℃, and the carbonization time is 2-8 h;
the carbonization is carried out in a mixed atmosphere of protective gas and oxygen, and the volume fraction of the oxygen is 0-1%.
The invention provides a magnetic biochar composite material prepared by the preparation method in the technical scheme, and the magnetic biochar composite material comprises biochar, iron metal oxide and non-iron oxide loaded on the biochar, and amino, carboxyl and hydroxyl on the surface of the biochar.
Preferably, the loading amount of the iron metal oxide is 1-30%, and the loading amount of the non-iron oxide is 1-20%.
The invention also provides application of the magnetic biochar composite material in the technical scheme as a heavy metal ion adsorbent.
The invention provides a preparation method of a magnetic biochar composite material, which comprises the following steps: placing a biomass raw material into a steeping liquor for steeping to obtain steeped biomass; drying, aging and carbonizing the impregnated biomass in sequence to obtain a magnetic biochar composite material; the impregnation liquid comprises a first impregnation liquid or a second impregnation liquid; the first impregnation liquid comprises iron ions and non-iron ions; the second impregnation liquid comprises a nitrogen source, iron ions and non-iron ions; the non-ferrous metal ions include Mg2+And/or Mn2+(ii) a When the impregnation liquid is the first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in the eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process; when the impregnation liquid is a first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in a non-eutrophication polluted water area, and ammonia gas is introduced in the carbonization process; when the impregnation liquid is the second impregnation liquid, the biomass raw material is a biomass material of the aquatic plant in the non-eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process. The invention can make the coating by dippingThe surface of the biomass raw material is adsorbed with iron ions and the nonferrous metal ions, the metal ions are more firmly attached to the surface of the biomass material and the cells of the biomass material through aging, and the ions on the surface of the biomass material can form corresponding metal oxides through carbonization; meanwhile, nitrogen source or ammonia gas contained in the aquatic plants in the eutrophic polluted water area in the carbonization process generates nitrogen-containing groups at high temperature, such as pyrimidine nitrogen, pyridine nitrogen, pyrrole nitrogen, amino and other groups. According to the invention, the pre-conductors (nitrogen source, iron ions and non-iron ions) are attached to the surface of the biomass by using the dipping pretreatment, and groups and particles which are favorable for adsorption are formed by using the complex reaction process of each component in a high-temperature environment, so that the traditional complex operation of step-by-step attached carbonization is replaced, the carbonization of the biomass, the formation and loading of metal oxide particles on the surface of carbon and the group modification on the surface of the carbon can be completed by only one-step carbonization, and the method has the advantages of simple process, energy conservation, environmental protection and low cost, and is suitable for industrial production.
The surface of the magnetic biochar composite material provided by the invention is rich in metal oxide particles, amino, hydroxyl and carboxyl, under the synergistic effect of physical adsorption, ion exchange and functional group combined multiple adsorption modes, the adsorption capacity of the biochar composite material on various heavy metals such as lead ions, copper ions and cadmium ions can be obviously improved, and the adsorption effect on the lead ions is particularly excellent. The magnetic biochar composite material obtained by the invention has excellent adsorption performance on heavy metals such as lead and the like, and has obvious advantages compared with the traditional magnetic biochar. As shown in the results of the examples of the invention, the adsorption amount of the magnetic biochar composite material prepared by the invention on lead ions is up to 294.9 mg/g.
Detailed Description
The invention provides a preparation method of a magnetic biochar composite material, which comprises the following steps:
placing a biomass raw material into a steeping liquor for steeping to obtain steeped biomass;
drying, aging and carbonizing the impregnated biomass in sequence to obtain a magnetic biochar composite material;
the impregnation liquid comprises a first impregnation liquid or a second impregnation liquid; the first impregnation liquid comprises iron ions and non-iron ions and does not comprise a nitrogen source; the second impregnation liquid comprises a nitrogen source, iron ions and non-iron ions; the non-ferrous metal ions include Mg2+And/or Mn2+；
When the impregnation liquid is the first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in the eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process;
when the impregnation liquid is a first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in a non-eutrophication polluted water area, and ammonia gas is introduced in the carbonization process;
when the impregnation liquid is the second impregnation liquid, the biomass raw material is a biomass material of the aquatic plant in the non-eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
The biomass raw material is placed in the impregnation liquid for impregnation to obtain the impregnated biomass.
According to the invention, the adding time is different according to the form of the nitrogen source, in the invention, the form of the nitrogen source comprises a biological medium, water-soluble ions and a gas state, so that the types of the steeping liquor are different, and in the invention, the steeping liquor comprises two types, namely a first steeping liquor or a second steeping liquor; the first impregnation liquid comprises iron ions and non-iron ions and does not contain a nitrogen source; the second impregnation liquid comprises a nitrogen source, iron ions and non-iron ions; the non-ferrous metal ions include Mg2+And/or Mn2+。
In the present invention, the nitrogen source of the second impregnation liquid preferably includes one or more of ammonia, nitrate, nitrite and amino acid, and more preferably ammonia.
In the present invention, the iron ion (Fe)3+) Preferably from soluble ferric salts, preferably one or more of ferric chloride, ferric nitrate and ferric sulphate.
In the present invention, the Mg2+Preferably from soluble magnesium salts; the soluble magnesium salts preferably include magnesium chloride and/or magnesium nitrate; the Mn is2+Preferably from soluble manganese salts; the soluble manganese salt preferably comprises manganese chloride and/or manganese nitrate.
In the invention, in the second impregnation liquid, the concentration of N in the nitrogen source solution is preferably 0.05-0.5 mol/L, more preferably 0.1-0.5 mol/L, and most preferably 0.5 mol/L; the concentration of iron ions in the first impregnation liquid or the second impregnation liquid is preferably 0.1-1 mol/L; the concentration of the non-ferrous metal ions in the first impregnation liquid or the second impregnation liquid is preferably 0.01-0.5 mol/L, more preferably 0.1-0.5 mol/L, and most preferably 0.5 mol/L.
In the invention, when the steeping liquor is the first steeping liquor, the steeping liquor does not contain a nitrogen source, namely the nitrogen source exists in two forms, namely a biological medium or a gas state, and when the nitrogen source is in a biological medium, the biomass raw material is an aquatic plant in a eutrophicated polluted water area.
In the present invention, the nitrogen content in the aquatic plants in the eutrophic polluted water area is preferably 2% to 5%, and more preferably 3% to 4%. In the invention, the aquatic plants in the eutrophic polluted water area are rich in nitrogen elements, and when the aquatic plants are used as raw materials, a nitrogen source is not required to be additionally added, so that the production cost is greatly reduced. In the present invention, the aquatic plants in the eutrophic polluted water area preferably include one or more of Acorus calamus, water hyacinth, lentinus edodes, macropolycycle algae, canna indica and cress.
When the impregnation liquid is the first impregnation liquid and the nitrogen source exists in a gaseous state, the nitrogen source is added in the carbonization process, and ammonia gas is introduced in the carbonization process.
In the present invention, when the impregnation liquid is the second impregnation liquid, the impregnation liquid contains a nitrogen source, that is, the nitrogen source is present in the form of soluble ions, and when the nitrogen source is added to the impregnation liquid, the biomass raw material is a biomass raw material of an aquatic plant in a non-eutrophicated polluted water area.
The present invention is not particularly limited in the kind of biomass raw material of the aquatic plant in the non-eutrophicated polluted water area, and it is sufficient to use biomass raw material for producing bio-char, which is well known to those skilled in the art. In the present invention, the nitrogen content of the aquatic plants in the non-eutrophicated contaminated water area is preferably not more than 2% by dry weight of the aquatic plants. In the invention, the biomass raw material of the aquatic plant in the non-eutrophic polluted water area preferably comprises one or more of wood, bamboo, nut shell, straw and coconut shell; the nutshells preferably comprise one or more of walnut shells and macadamia nut shells. The invention takes wood, bamboo, nut shell, straw or coconut shell as carbon source, realizes the secondary utilization of aquatic plant or crop solid waste, has wide raw material source and greatly reduces the production cost.
In the present invention, the biomass feedstock is preferably dried and crushed prior to use. In the invention, the drying temperature is preferably 40-65 ℃, and more preferably 50-60 ℃; the drying time is preferably 12-48 h, and more preferably 20-30 h. The crushing mode is not particularly limited, and the crushing mode known in the art can ensure that the granularity of the biomass raw material meets the requirement. In the invention, the granularity of the crushed biomass raw material is preferably 0.25-1 mm, and more preferably 0.5-0.8 mm.
In the invention, the impregnation is preferably equal-volume impregnation, and the equal-volume impregnation is adopted, so that iron metal ions and non-iron metal ions in the solution can be ensured to be completely adsorbed on the surface of the biomass material, free metal ions can not be generated, the waste of a large amount of raw materials is avoided, and the production cost is saved.
In the invention, the dipping temperature is preferably 20-40 ℃, and more preferably 25-30 ℃; the soaking time is preferably 2-8 h, more preferably 3-7 h, and most preferably 4-6 h. In the invention, the dipping is preferably carried out under ultrasonic conditions, and the power of the ultrasonic is preferably 800-1200W, more preferably 900-1100W, and most preferably 1000W. The invention is dipped under the ultrasonic condition, can accelerate metal ions and nitrogen source ions to enter biomass cells, and can be more tightly combined with biomass raw materials, thereby improving the adsorption performance of the lead ions of the magnetic biochar composite material.
After the impregnated biomass is obtained, the impregnated biomass is sequentially dried, aged and carbonized to obtain the magnetic biochar composite material.
When the impregnation liquid is the first impregnation liquid and the biomass raw material is the aquatic plant in the eutrophication polluted water area, ammonia gas is not introduced in the carbonization process;
when the impregnation liquid is a first impregnation liquid and the biomass raw material is a biomass material of the aquatic plant in the non-eutrophic polluted water area, introducing ammonia gas in the carbonization process;
when the impregnation liquid is the second impregnation liquid and the biomass raw material is the biomass material of the aquatic plant in the non-eutrophication polluted water area, ammonia gas is not introduced in the carbonization process.
In the invention, the drying temperature is preferably 40-65 ℃, more preferably 45-60 ℃, and most preferably 50-60 ℃; the drying time is preferably 12-48 h, more preferably 15-36 h, and most preferably 20-30 h. In the invention, the drying can remove the redundant moisture in the system, and avoid the negative influence on the surface of the carbon material caused by the smoke generated by the excessive moisture in the pyrolysis process.
In the invention, the aging temperature is preferably 0-40 ℃, and more preferably 20-30 ℃; the aging time is preferably 12-24 hours, and more preferably 15-20 hours. In the aging process, the aging has the effect that metal ions and nitrogen source ions have enough time to be combined with the biomass raw material, so that the metal ions and the nitrogen source ions are more firmly attached to the surface of the biomass material and the cells of the biomass material, and the adsorption performance of the lead ions of the magnetic biochar composite material is further improved.
In the invention, the carbonization temperature is preferably 300-800 ℃, more preferably 400-800 ℃, and most preferably 500-700 ℃; the carbonization time is 2-8 h, more preferably 3-6 h, and most preferably 4-6 h.
In the present invention, when ammonia gas is not introduced during the carbonization, the carbonization is preferably performed in a mixed atmosphere of a protective atmosphere and oxygen gas, and the protective atmosphere is preferably nitrogen gas or argon gas; the volume fraction of the oxygen is preferably 0-1%.
In the invention, when ammonia gas is introduced in the carbonization process, the carbonization is preferably carried out in a protective atmosphere, a mixed atmosphere of ammonia gas and oxygen gas, and the protective atmosphere is preferably nitrogen or argon gas; the volume fraction of the oxygen is preferably 0-1%; the volume fraction of the ammonia gas is preferably 0.01 to 1%, and more preferably 0.01 to 0.1%.
Compared with the conventional carbonization in the protective atmosphere, the method disclosed by the invention has the advantages that the carbonization is carried out in the presence of a certain proportion of oxygen, so that more oxygen-containing groups such as hydroxyl groups and carboxyl groups can be generated on the surface of the carbon material, and the adsorption performance of the lead ions of the magnetic biochar composite material is further improved.
In the invention, during the carbonization process, organic matters such as lignin, cellulose and the like contained in the biomass raw material are converted into carbon; meanwhile, nitrogen source or ammonia gas contained in the aquatic plants in the eutrophic polluted water area can form amino on the surface of the biomass at high temperature, so that the group modification on the surface of the biochar is completed; meanwhile, the iron ions and the non-iron ions which are dipped on the surface of the biomass material generate corresponding metal oxides under the high-temperature condition, so that the modification of the surface groups of the biochar and the carbon and the loading of iron metal oxides and non-iron metal oxide particles are simultaneously realized in the one-step carbonization process, the operation is simple, the energy consumption is low, the cost is low, the method is suitable for industrial production, and the prepared magnetic biochar composite material has excellent adsorption effect on heavy metal ions such as lead ions, copper ions, cadmium ions and the like.
After the carbonization is completed, the present invention preferably further comprises crushing the obtained carbonized product. The crushing mode is not particularly limited, and the crushing mode known in the field can ensure that the granularity of the magnetic biochar composite material meets the requirement. In the invention, the granularity of the magnetic biochar composite material is preferably 0.3-1 μm, and more preferably 0.5-0.8 μm.
The invention provides a magnetic biochar composite material prepared by the preparation method in the technical scheme, which comprises biochar, iron metal oxide and non-iron oxide loaded on the biochar, and amino on the surface of the biochar.
In the invention, the loading amount of the iron metal oxide is preferably 1-30%, and more preferably 10-20%; the loading amount of the non-iron oxide is preferably 1-20%, and more preferably 5-10%. In the invention, the loading amount is the mass percentage of the iron metal oxide on the biochar.
In the invention, the biochar surface in the magnetic biochar composite material further comprises amino, hydroxyl and carboxyl.
The surface of the magnetic biochar composite material provided by the invention is rich in iron metal oxide and non-iron oxide particles, the biochar surface is rich in amino, hydroxyl and carboxyl, and the adsorption capacity of the biochar composite material on lead ions is remarkably improved through the synergistic effect of surface adsorption, ion exchange and functional group combination in multiple adsorption modes through the ion exchange effect of metal oxides such as magnesium and/or manganese and heavy metals and the combination of amino, hydroxyl and carboxyl groups on the surface and heavy metal ions.
The invention also provides application of the magnetic biochar composite material in the technical scheme as a heavy metal ion adsorbent.
In the invention, the application conditions of the magnetic biochar composite material as the lead adsorbent comprise: the pH value of the sewage to be treated is preferably 4.5-9; the concentration range value of heavy metal ions in the sewage to be treated is preferably less than or equal to 200 ppm; the dosage of the magnetic biochar composite material as a lead adsorbent is preferably 0.5-2 g/L.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Drying walnut shells at 65 ℃ for 12h, crushing the walnut shells into powder with the particle size of 0.2mm, and placing 5g of walnut shell powder in an impregnation liquid for ultrasonic impregnation at 40 ℃ and 800W for 2h to obtain impregnated walnut shell powder; ammonia water and Fe in the dipping solution3+And Mg2+The concentration of (b) is 0.1mol/L, 0.5mol/L and 0.5mol/L in sequence.
Aging the impregnated walnut shell powder at 25 deg.C for 24h, drying in oven at 65 deg.C for 12h, placing in tubular furnace at 300 deg.C and N2/O2Mixed atmosphere (O)2The volume fraction is 0.1%) for 2h, and then grinding the carbonized sample to the granularity of 0.05mm to obtain the magnetic biochar composite material.
Examples 2 to 27
Magnetic biochar composites were prepared according to the method of example 1, with the preparation conditions of examples 2-27 as shown in table 1.
Example 28
Drying walnut shells at 65 ℃ for 12h, crushing the walnut shells into powder with the particle size of 0.25mm, and placing 5g of walnut shell powder in an impregnation liquid for ultrasonic impregnation at 40 ℃ and 800W for 2h to obtain impregnated walnut shell powder; fe in impregnating solution3+And Mg2 +The concentration of (b) is 0.5mol/L and 0.5mol/L in this order.
Aging the impregnated walnut shell powder at 25 deg.C for 24h, drying in oven at 65 deg.C for 2h, placing in tubular furnace at 700 deg.C, and NH3/N2/O2Mixed atmosphere (O)2Volume fraction of 0.1%, NH3The volume fraction is 0.05%), and then the carbonized sample is ground to the granularity of 0.05mm, so as to obtain the magnetic biochar composite material.
Example 29
Drying Acorus calamus in eutrophication polluted water area at 65 ℃ for 12h, crushing to powder with the particle size of 0.25mm, putting 5g of raw material powder into impregnation liquid, and performing ultrasonic impregnation at 40 ℃ and 800W for 2h to obtain impregnated biomass raw material; fe in impregnating solution3+And Mg2+The concentration of (b) is 0.5mol/L and 0.5mol/L in this order.
Aging the impregnated biomass raw material at 25 ℃ for 24h, drying the impregnated biomass raw material in a drying oven at 65 ℃ for 2h, placing the dried impregnated biomass raw material in a tubular furnace at 700 ℃ and NH3/N2/O2Mixed atmosphere (O)2Volume fraction of 0.1%, NH3The volume fraction is 0.05%), and then the carbonized sample is ground to the granularity of 0.05mm, so as to obtain the magnetic biochar composite material.
TABLE 1 preparation conditions of examples 1 to 29
The structure characterization results of the magnetic biochar composite materials prepared in examples 1-29 are shown in table 2.
TABLE 2 Structure characterization results of magnetic biochar composites
Adsorption experiments
Magnetic biochar composites prepared in examples 1-29 for Pb2+The adsorption experiment of (3) was carried out in a 50mL Erlenmeyer flask. First, ultrapure water is used0.1mol/L of H2SO4Or adjusting the pH value of the NaOH solution to be required by 0.1mol/L, adding 40mL of reagent water with the adjusted pH value into each conical flask, and continuously oscillating by using a shaking table at the speed of 150 r/min; meanwhile, lead ion standard solutions with different volumes are respectively added, so that the initial concentration of the heavy metal reaches different values. Respectively adding a certain mass of magnetic biochar for reaction; after the reaction reached equilibrium (12h), the biochar composite material was removed, the supernatant was filtered through a 0.45 μm Polytetrafluoroethylene (PTFE) filter, placed in a sample bottle, 10 μ L of 1.0mol/L nitric acid solution was immediately added, and vortexed for 10 s. Detecting the content of lead ions in the obtained sample by inductively coupled plasma mass spectrometry (ICP-MS), and calculating the adsorption quantity (Q) of heavy metal ions according to the quantity of the reduced lead ions in the aqueous solution and the mass of the added biochar composite materialt)：
Wherein, C0Is the initial concentration in solution (mg/L), CtIs the concentration (mg/L) in the solution after adsorption for t time, V is the volume (L) of the solution, and m is the mass (g) of the adsorbate charged into the solution.
TABLE 3 magnetic biochar composites prepared in examples 1-29 vs Pb2+Adsorption result of (2)
As can be seen from tables 2 and 3, the larger the specific surface area of the magnetic biochar composite material is, the stronger the adsorption capacity to lead ions is; the average pore diameter and the total volume of micropores of the biochar have no significant influence on the lead ion adsorption capacity of the biochar.
As can be seen from table 3, after the biomass raw material is impregnated with ammonia water, the adsorption capacity of the prepared biochar on lead ions is enhanced; after the biomass raw material is impregnated with iron ions, the adsorption capacity of the prepared biochar on lead ions is enhanced; magnesium ions are impregnated in the biomass raw material, and the adsorption capacity of the prepared charcoal on lead ions is enhanced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the magnetic biochar composite material is characterized by comprising the following steps of:
placing a biomass raw material into a steeping liquor for steeping to obtain steeped biomass;
drying, aging and carbonizing the impregnated biomass in sequence to obtain a magnetic biochar composite material;
the impregnation liquid comprises a first impregnation liquid or a second impregnation liquid; the first impregnation liquid comprises iron ions and non-iron ions and does not comprise a nitrogen source; the second impregnation liquid comprises a nitrogen source, iron ions and non-iron ions; the non-ferrous metal ions include Mg2+And/or Mn2+；
When the impregnation liquid is the first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in the eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process;
when the impregnation liquid is a first impregnation liquid, the biomass raw material is a biomass material of aquatic plants in a non-eutrophication polluted water area, and ammonia gas is introduced in the carbonization process;
when the impregnation liquid is the second impregnation liquid, the biomass raw material is a biomass material of the aquatic plant in the non-eutrophication polluted water area, and ammonia gas is not introduced in the carbonization process.
2. The method according to claim 1, wherein the nitrogen source in the second impregnation solution comprises one or more of ammonia, nitrate, nitrite and amino acid.
3. The method according to claim 1, wherein the concentration of the nitrogen source in the second impregnation solution is 0.05 to 0.5 mol/L; the concentration of the iron ions in the first impregnation liquid or the second impregnation liquid is 0.1-1 mol/L, and the concentration of the non-iron metal ions in the first impregnation liquid or the second impregnation liquid is 0.1-1 mol/L.
4. The method according to any one of claims 1 to 3, wherein the impregnation is carried out at a temperature of 20 to 40 ℃ for 2 to 8 hours;
the dipping is carried out under the ultrasonic condition, and the power of the ultrasonic is 800-1200W.
5. The method according to claim 1, wherein the drying is carried out at a temperature of 40 to 65 ℃ for 12 to 48 hours.
6. The method of claim 1, wherein the aging is carried out at a temperature of 0 to 40 ℃ for 12 to 48 hours.
7. The preparation method according to claim 1, wherein the carbonization temperature is 300-800 ℃ and the carbonization time is 2-8 h;
the carbonization is carried out in a mixed atmosphere of protective gas and oxygen, and the volume fraction of the oxygen is 0-1%.
8. The magnetic biochar composite material prepared by the preparation method of any one of claims 1 to 7 is characterized by comprising biochar, iron metal oxides and non-iron oxides loaded on the surface of the biochar, and amino groups, carboxyl groups and hydroxyl groups on the surface of the biochar.
9. The magnetic biochar composite material as claimed in claim 8, wherein the loading amount of the iron metal oxide is 1-30%, and the loading amount of the non-iron oxide is 1-20%.
10. Use of the magnetic biochar composite of claim 9 as a heavy metal ion adsorbent.
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| CN113277605A (en) * | 2021-05-31 | 2021-08-20 | 杭州师范大学 | Modified biochar algistat and application and preparation method thereof |
| CN114749148A (en) * | 2022-04-15 | 2022-07-15 | 中南大学 | Composite modified banana peel biochar and preparation method and application thereof |
| CN115155543A (en) * | 2022-05-19 | 2022-10-11 | 浙江科技学院 | Method for preparing magnetic magnesium-iron LDH-biochar composite material in one step and application |
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2020
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277605A (en) * | 2021-05-31 | 2021-08-20 | 杭州师范大学 | Modified biochar algistat and application and preparation method thereof |
| CN114749148A (en) * | 2022-04-15 | 2022-07-15 | 中南大学 | Composite modified banana peel biochar and preparation method and application thereof |
| CN114749148B (en) * | 2022-04-15 | 2023-10-27 | 中南大学 | Composite modified banana peel biochar and preparation method and application thereof |
| CN115155543A (en) * | 2022-05-19 | 2022-10-11 | 浙江科技学院 | Method for preparing magnetic magnesium-iron LDH-biochar composite material in one step and application |
| CN115155543B (en) * | 2022-05-19 | 2023-10-20 | 浙江科技学院 | Method for preparing magnetic magnesium-iron LDH-biochar composite material in one step and application |
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