CN112642399A - Method for synthesizing efficient adsorbent by using low-grade magnesite one-pot method - Google Patents
Method for synthesizing efficient adsorbent by using low-grade magnesite one-pot method Download PDFInfo
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- CN112642399A CN112642399A CN202110010959.3A CN202110010959A CN112642399A CN 112642399 A CN112642399 A CN 112642399A CN 202110010959 A CN202110010959 A CN 202110010959A CN 112642399 A CN112642399 A CN 112642399A
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 26
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 26
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 26
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 26
- 230000002194 synthesizing effect Effects 0.000 title claims abstract description 11
- 238000005580 one pot reaction Methods 0.000 title claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 21
- 239000002028 Biomass Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 239000003610 charcoal Substances 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 239000002243 precursor Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 5
- 244000105624 Arachis hypogaea Species 0.000 claims description 5
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 5
- 235000018262 Arachis monticola Nutrition 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 5
- 235000020232 peanut Nutrition 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000000197 pyrolysis Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000010811 mineral waste Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 235000013162 Cocos nucifera Nutrition 0.000 claims 1
- 244000060011 Cocos nucifera Species 0.000 claims 1
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 239000011257 shell material Substances 0.000 claims 1
- 239000002023 wood Substances 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 26
- 239000003337 fertilizer Substances 0.000 abstract description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011574 phosphorus Substances 0.000 abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 4
- 230000008635 plant growth Effects 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 244000068988 Glycine max Species 0.000 description 9
- 235000010469 Glycine max Nutrition 0.000 description 9
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 6
- 235000019796 monopotassium phosphate Nutrition 0.000 description 6
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 241000287828 Gallus gallus Species 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 210000003608 fece Anatomy 0.000 description 3
- 239000010871 livestock manure Substances 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- DJFBJKSMACBYBD-UHFFFAOYSA-N phosphane;hydrate Chemical compound O.P DJFBJKSMACBYBD-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 238000003911 water pollution 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
- 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
-
- 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
-
- 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
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/305—Addition of material, later completely removed, e.g. as result of heat treatment, leaching or washing, e.g. for forming pores
-
- 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
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/42—Materials comprising a mixture of inorganic materials
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fertilizers (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a method for synthesizing a high-efficiency adsorbent by using a low-grade magnesite one-pot method, belonging to the field of adsorption materials. Based on factors such as more impurity components, high chemical activity and essential elements for plant growth in low-grade magnesite, acid-soluble metal impurities and acid-insoluble slag in the low-grade magnesite are combined with biomass charcoal to prepare a slag-biomass charcoal dual-carrier composite metal oxide adsorbent, the excellent phosphorus directional adsorption performance of magnesium elements and various impurities is utilized, the biomass charcoal is used as the essential element for plant growth and is used for adsorbing phosphorus-containing wastewater, and the adsorbed adsorbent can be used as a fertilizer, so that the phosphorus in the wastewater can be reused in the field of fertilizers. The method is simple to operate and suitable for industrial production.
Description
Technical Field
The invention belongs to the field of adsorbent materials, and particularly relates to a method for synthesizing a high-efficiency adsorbent by using a low-grade magnesite one-pot method.
Background
With the increasing world population, the environmental water pollution caused by using a large amount of fertilizer due to the increase of the grain yield is increasingly severe, when the phosphorus element in the water is increased to 0.2mg/L, the water becomes eutrophicated, plants in the water are out of control to grow, and a large amount of fish and other organisms are killed. Therefore, the effective separation of the phosphorus element in the water body is very important for the grain safety of people all over the world.
At present, the existing water phosphorus element treatment method comprises technologies such as precipitation, adsorption, membrane separation and the like, wherein the adsorption method has the advantages of easy separation, low cost and the like and is widely applied. Common adsorbent modes include physical adsorption and chemical adsorption, wherein the physical adsorption adopts adsorbing materials such as activated carbon, alumina, diatomite, bentonite and the like, and the chemical adsorption includes high-specific-surface-area magnesium oxide, hydrotalcite, calcium oxide and the like. Physical adsorption generally realizes physical adsorption by virtue of high specific surface area and electronegativity of an adsorbent material and by virtue of van der waals force and hydrogen bonds, and has the problems of low adsorption capacity, large influence of material morphology and the like. The chemical adsorption realizes the directional adsorption by the chemical action of the high specific surface area adsorbent and the pollution factor, and the adsorption effect is closely related to the specific surface area and the reaction activity of the material.
In recent years, the composite adsorbent is influenced by a synergistic effect, so that the adsorption effect is far greater than the addition of the composite adsorbent and the activated carbon, for example, the adsorption efficiency is greatly improved compared with that of biomass carbon when the activated carbon is loaded with magnesium oxide. In addition, the addition of magnetic iron element can promote the adsorption and separation of the adsorbent. The traditional adsorbent adding magnetic element technology causes the cost to be increased correspondingly. Besides a large amount of magnesium oxide, the low-grade magnesite has high contents of acid-soluble iron, calcium, manganese and other elements and acid-insoluble slag substances, so that the application of the magnesite is severely limited, and the elements and the substances are important trace elements for plant growth.
Based on the problems, the invention provides a method for synthesizing a high-efficiency adsorbent by using a low-grade magnesite one-pot method, which is characterized in that acid is used for neutralizing low-grade magnesite and biomass, a mixture after dehydration is subjected to high-temperature thermal decomposition to directly synthesize a magnetic composite adsorbent, biomass carbon and slag are used as double carriers to load active composite metal oxides, the adsorption performance of the composite adsorbent on phosphorus in wastewater is improved, the adsorbed adsorbent can be used as a composite fertilizer, and the composite fertilizer has a continuous slow release effect and can realize the reutilization of phosphorus resources. The technology has simple process and is suitable for industrial production.
Disclosure of Invention
A method for synthesizing a composite adsorbent by using a low-grade magnesite one-pot method is characterized by comprising the following steps: the composite adsorbent comprises a high-porosity activated carbon carrier, mineral waste residues and active metal oxides, and the preparation method of the composite adsorbent comprises the following steps:
(1) dipping: reacting acid solution with magnesite powder, controlling the pH to be 5-8 to obtain turbid liquid, adding crushed biomass into the turbid liquid, and soaking for 8 hours at the temperature of 20-40 ℃, wherein the turbid liquid contains certain metal salt and slag;
(2) dewatering: and drying the mixture in a drying box at 60-150 ℃ to remove water to obtain a precursor for later use.
(3) Pyrolysis: putting the obtained precursor into an atmosphere furnace at 500-900 ℃ for high-temperature treatment for 1-6 hours;
(4) washing: after the material is cooled to room temperature, washing with deionized water to remove impurities;
(5) and (3) drying: and removing water in a drying oven at the temperature of 80-180 ℃ to obtain the composite adsorbent.
The acid solution is one or a mixture of nitric acid and sulfuric acid.
The biomass charcoal raw material is selected from any one or more than two of straw, peanut shell or rice hull.
The mass ratio of the magnesite to the biomass charcoal is 1: 20-6: 20, and the preferred mass ratio is 4: 20. The composite adsorbent adsorbs phosphorus in the wastewater and is applied to soil again to be used as a compound fertilizer.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of the present invention.
The invention has the advantages of
The method for synthesizing the efficient adsorbent by using the low-grade magnesite solves the problems of high metal content, high impurity content and high slag content in the low-grade magnesite, and simultaneously, the low-grade magnesite is designed to be used as the adsorbent before adsorption and used as the fertilizer after adsorption based on that the impurity in the low-grade magnesite is an important substance for crop growth.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to be limiting. The upper and lower line values and intervals of the process parameters listed in the technical scheme of the invention can realize the products required by the invention.
Example 1
(1) Dipping: reacting 88g of low-grade magnesite powder with a nitric acid solution, controlling the pH to be =7 to obtain a turbid solution, adding 120g of crushed peanut shells into the turbid solution, and soaking for 8 hours at 25 ℃;
(2) dewatering: the mixture is further dried in a drying oven at 80 ℃ to remove moisture, and a precursor is obtained for later use.
(3) Pyrolysis: putting the obtained precursor into an atmosphere furnace at 550 ℃ for high-temperature treatment for 2 hours;
(4) washing: after the material is cooled to room temperature, washing with deionized water to remove impurities;
(5) and (3) drying: removing water in a drying oven at 120 ℃ to obtain the composite adsorbent.
0.1g of the composite adsorbent is used for adsorbing 300mg/L and 200mL of potassium dihydrogen phosphate-containing solution, the adsorption capacity of potassium dihydrogen phosphate is 580mg P/g, the adsorbent is filtered and dried after adsorption and then applied to soybean crops, and compared with the soybean crops with chicken manure as fertilizer, the yield of the soybean with the composite adsorbent is improved by 7.5%.
Example 2
(1) Dipping: reacting 88g of low-grade magnesite powder with a sulfuric acid solution, controlling the pH to be =6.5 to obtain a turbid solution, adding 100g of crushed peanut shells into the turbid solution, and soaking for 8 hours at 25 ℃;
(2) dewatering: the mixture is further dried in a drying oven at 90 ℃ to remove moisture, and a precursor is obtained for later use.
(3) Pyrolysis: putting the obtained precursor into an atmosphere furnace at 600 ℃ for high-temperature treatment for 1.5 hours;
(4) washing: after the material is cooled to room temperature, washing with deionized water to remove impurities;
(5) and (3) drying: removing water in a drying oven at 120 ℃ to obtain the composite adsorbent.
The composite adsorbent is used for adsorbing 300mg/L and 200mL of potassium dihydrogen phosphate-containing solution, the adsorption capacity of potassium dihydrogen phosphate is 563mg P/g, the adsorbent is filtered and dried after adsorption and then applied to soybean crops, and compared with the soybean crops with chicken manure as fertilizer, the yield of the compound fertilizer soybean applied with the adsorbent is improved by 6.6%.
Example 3
(1) Dipping: reacting 88g of low-grade magnesite powder with a nitric acid solution, controlling the pH to be =8 to obtain a turbid solution, adding 100g of crushed peanut shells into the turbid solution, and soaking for 8 hours at 25 ℃;
(2) dewatering: the mixture is further dried in a drying oven at 150 ℃ to remove moisture, and a precursor is obtained for later use.
(3) Pyrolysis: putting the obtained precursor into an atmosphere furnace at 800 ℃ for high-temperature treatment for 3 hours;
(4) washing: after the material is cooled to room temperature, washing with deionized water to remove impurities;
(5) and (3) drying: removing water in a drying oven at 120 ℃ to obtain the composite adsorbent.
The composite adsorbent is used for adsorbing 300mg/L and 200mL of potassium dihydrogen phosphate-containing solution, the adsorption capacity of potassium dihydrogen phosphate is 532mg P/g, the adsorbent is filtered and dried after adsorption and then applied to soybean crops, and compared with the soybean crops with chicken manure as fertilizer, the yield of the compound fertilizer soybean applied with the adsorbent is increased by 11%.
Claims (4)
1. A method for synthesizing a high-efficiency adsorbent by using a low-grade magnesite one-pot method is characterized by comprising the following steps of: the adsorbent comprises a high-porosity activated carbon carrier, a mineral waste residue carrier and an active metal oxide, and the preparation method of the adsorbent comprises the following steps:
(1) dipping: reacting acid solution with magnesite powder, controlling the pH to be 5-8 to obtain turbid liquid, adding crushed biomass into the turbid liquid, and soaking for 8 hours at the temperature of 20-40 ℃, wherein the turbid liquid contains certain metal salt and slag;
(2) dewatering: drying the mixture in a drying oven at 60-150 ℃ to remove water to obtain a precursor for later use;
(3) pyrolysis: putting the obtained precursor into an atmosphere furnace at 500-900 ℃ for high-temperature treatment for 1-6 hours;
(4) washing: after the material is cooled to room temperature, washing with deionized water to remove impurities;
(5) and (3) drying: and removing water in a drying oven at the temperature of 80-180 ℃ to obtain the composite adsorbent.
2. The method for synthesizing the high-efficiency adsorbent by using the low-grade magnesite one-pot method according to claim 1, is characterized in that: the acid solution is one or a mixture of nitric acid and sulfuric acid.
3. The method for synthesizing the high-efficiency adsorbent by using the low-grade magnesite one-pot method according to claim 1, is characterized in that: the biomass charcoal raw material is selected from any one or more than two of straw, peanut shell, coconut shell, bamboo, wood or rice hull.
4. The method for synthesizing the high-efficiency adsorbent by using the low-grade magnesite one-pot method according to claim 1, is characterized in that: the mass ratio of the magnesite to the biomass charcoal is 1: 20-6: 20, and the preferred mass ratio is 4: 20.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115970650A (en) * | 2023-03-20 | 2023-04-18 | 四川省冶勘设计集团生态环境工程有限公司 | Composite biochar and preparation method and application thereof |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115970650A (en) * | 2023-03-20 | 2023-04-18 | 四川省冶勘设计集团生态环境工程有限公司 | Composite biochar and preparation method and application thereof |
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