CN116272863A - Preparation method and application of phosphorus-oriented adsorption biochar - Google Patents
Preparation method and application of phosphorus-oriented adsorption biochar Download PDFInfo
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- CN116272863A CN116272863A CN202310159471.6A CN202310159471A CN116272863A CN 116272863 A CN116272863 A CN 116272863A CN 202310159471 A CN202310159471 A CN 202310159471A CN 116272863 A CN116272863 A CN 116272863A
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 83
- 239000011574 phosphorus Substances 0.000 claims abstract description 83
- 239000002028 Biomass Substances 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 34
- 238000000197 pyrolysis Methods 0.000 claims abstract description 29
- 238000013270 controlled release Methods 0.000 claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000003337 fertilizer Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000012298 atmosphere Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 238000007873 sieving Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 25
- 239000010902 straw Substances 0.000 claims description 10
- 240000007594 Oryza sativa Species 0.000 claims description 7
- 235000007164 Oryza sativa Nutrition 0.000 claims description 7
- 235000009566 rice Nutrition 0.000 claims description 7
- 240000008042 Zea mays Species 0.000 claims description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 3
- 235000005822 corn Nutrition 0.000 claims description 3
- 239000010921 garden waste Substances 0.000 claims description 3
- 241000526900 Camellia oleifera Species 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 42
- 239000011777 magnesium Substances 0.000 abstract description 31
- 239000000395 magnesium oxide Substances 0.000 abstract description 29
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 26
- 229910052749 magnesium Inorganic materials 0.000 abstract description 26
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 abstract description 24
- 239000002994 raw material Substances 0.000 abstract description 18
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract description 15
- 229910001629 magnesium chloride Inorganic materials 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 125000000524 functional group Chemical group 0.000 abstract description 3
- 238000011068 loading method Methods 0.000 abstract description 3
- 238000002715 modification method Methods 0.000 abstract description 2
- -1 firstly Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 241000207199 Citrus Species 0.000 description 3
- 240000008790 Musa x paradisiaca Species 0.000 description 3
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 3
- 235000020971 citrus fruits Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 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
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- 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
- B01J20/28014—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 form
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
Abstract
The invention discloses a preparation method and application of directional adsorption biochar of phosphorus, firstly, waste biomass is cleaned, dried and crushed to obtain biomass powder; then fully and uniformly mixing the biomass powder and MgO according to the mass ratio of 1:1-4 to obtain mixed biomass powder; and pyrolyzing the mixed biomass powder at 500-900 ℃ for 1-3 hours in an anoxic atmosphere, naturally cooling to room temperature, filtering, drying, grinding and sieving to obtain the directional phosphorus adsorption biochar. According to the invention, the conventional waste biomass is used as a raw material, and the biomass powder raw material and magnesium oxide are directly mixed uniformly and then subjected to one-step pyrolysis to prepare the magnesium modified biochar, so that the influence of magnesium chloride solubility and biomass on the adsorption performance of magnesium chloride in the conventional magnesium modification method is avoided, the preparation process is simplified, the magnesium loading capacity is increased, the magnesium oxide serving as a functional group which is beneficial to phosphorus adsorption is directly formed, the adsorption quantity of phosphorus is obviously increased, and the magnesium modified biochar can be further used as a phosphorus controlled release fertilizer for plants.
Description
Technical Field
The invention relates to the technical field of solid waste resource utilization, in particular to a preparation method and application of phosphorus directional adsorption biochar, and more particularly relates to preparation of phosphorus directional adsorption biochar by using conventional waste biomass as a raw material through pyrolysis modification, and application of the phosphorus directional adsorption biochar to adsorption of phosphorus and a phosphorus controlled release fertilizer.
Background
Biochar refers to a class of carbon-rich solids obtained by biomass pyrolysis under anaerobic or anaerobic conditions. Biochar is often used as an adsorbent for pollutants due to its advantages of rich functional groups, developed pore structures, good specific surface area, etc. However, the surface of the general biochar contains abundant negative charges, has better adsorption effect on positively charged heavy metal ions, has poorer adsorption effect on anions, can have rejection reaction for adsorbing phosphate and nitrate, and needs to be subjected to physicochemical modification to improve the adsorption effect on anions such as phosphate.
Earlier researchers have found that the removal of phosphate ions in water body by biochar can be significantly improved by modifying metal ions such as magnesium, iron, calcium, lead and the like. For example, xu et al utilize LaCl 3 The lignocellulose biochar is prepared by modification and is used for adsorbing phosphate, and the adsorption quantity is up to 36.06mg/g; according to the method, the modified rice straw biochar is prepared by using Fe (II) and Fe (III), and the result shows that the adsorption quantity of the Fe (II) modified biochar to phosphorus is up to 39.2mg/g, and further field experiments show that the modified biochar also improves the utilization efficiency of quick-acting phosphorus; zhang et al used seawater as the calcium/magnesium source to impregnate fir wood to prepare modified biochar, and found that the maximum adsorption capacity of the prepared modified biochar to phosphate reached 181.07mg/g. The above studies show that the modification of metals, especially magnesium, can significantly improve the adsorption capacity of biochar to phosphate. Regarding the preparation of magnesium modified biochar, chinese patent CN110270310A discloses that magnesium chloride solution is added into biomass powder, fully and uniformly mixed, subjected to microwave, filtered and dried, and thermally cracked in an anoxic atmosphere at the temperature of 450-700 DEG CDecomposing to obtain magnesium modified biochar for phosphorus absorption; chinese patent CN110256174a discloses that straw biomass powder is added into magnesium chloride solution, mixed uniformly, soaked, filtered out and dried, and thermally cracked in an anoxic atmosphere at 450-700 ℃ to prepare magnesium modified biochar for phosphorus absorption. However, in the prior art, biomass raw materials are uniformly mixed and immersed in magnesium salt (for example, magnesium chloride) solution, and then the biomass raw materials are dried and subjected to pyrolysis to prepare the magnesium oxide modified biochar, so that the preparation process is relatively complex, and the number of magnesium oxide active sites in the prepared modified biochar is influenced due to the solubility of the magnesium chloride and the influence of the biochar on magnesium chloride adsorption, thereby being unfavorable for phosphorus adsorption and later application.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings in the prior art and provide a preparation method of directional adsorption biochar by phosphorus.
The second object of the invention is to provide the phosphorus-oriented adsorption biochar prepared by the preparation method.
The third object of the invention is to provide the application of the phosphorus directional adsorption biochar in phosphorus adsorption or preparation of phosphorus controlled release fertilizer.
The above object of the present invention is achieved by the following technical solutions:
a preparation method of directional adsorption biochar for phosphorus comprises the following steps:
s1, cleaning, drying and crushing waste biomass to obtain biomass powder;
s2, fully and uniformly mixing the biomass powder obtained in the step S1 with MgO according to the mass ratio of 1:1-4 to obtain mixed biomass powder;
s3, pyrolyzing the mixed biomass powder obtained in the step S2 at 500-900 ℃ for 1-3 h in an anoxic atmosphere, naturally cooling to room temperature, filtering, drying, grinding and sieving to obtain the biochar.
The invention directly prepares magnesia modified biochar capable of realizing phosphorus directional adsorption by taking conventional waste biomass as a raw material and adding magnesia for one-step pyrolysis. The difference is that the raw materials are chloridized in the prior artThe biomass powder raw material and magnesium oxide are uniformly mixed and then subjected to pyrolysis to prepare the magnesium modified biochar, so that the influence of the solubility of magnesium chloride and the biological substances on the adsorption performance of the magnesium chloride in the conventional magnesium modification method is avoided, the preparation process is simplified, the loading capacity of the magnesium is increased, the magnesium oxide serving as a functional group beneficial to phosphorus adsorption is directly formed, and the adsorption capacity of the phosphorus is further remarkably increased. While magnesium adsorbs phosphorus, although MgHPO is formed 4 And Mg (H) 2 HPO 4 ) 2 Belonging to precipitation, but MgHPO 4 Or Mg (H) 2 HPO 4 ) 2 Is not a permanent precipitate and can be slowly released under a proper environment, so that the biological carbon can be further used as a phosphorus controlled release fertilizer for plants. Compared with other phosphorus-adsorbed biochar, the phosphorus-adsorbed biochar has the advantages of simple preparation method, low-cost and easily-obtained raw materials, environment-friendly use, capability of overcoming the influence of the solubility of the modifier and the like. The method can obviously improve the recovery rate of the phosphorus when being used for the adsorption recovery of the phosphorus, and the phosphorus is slowly released due to the existence of the phosphorus in a precipitation form, so that the controlled release of the phosphorus is realized.
The biomass raw material for preparing the phosphorus-oriented adsorption biochar is a few conventional waste biomasses in production and living.
Preferably, the conventional waste biomass of step S1 includes, but is not limited to, any one or more of rice straw, corn straw, camellia oleifera shells or garden waste.
Further preferably, the conventional waste biomass of step S1 is rice straw.
Preferably, the crushing in the step S1 is performed to 0.5-1.0cm.
Preferably, in the step S2, the biomass powder and MgO are fully and uniformly mixed according to the mass ratio of 1:1-4.
Further preferably, the mass ratio of biomass powder to MgO in step S2 is 1:3-4.
Still preferably, the mass ratio of biomass powder to MgO in step S2 is 1:3.
Preferably, the anoxic atmosphere in step S3 is a nitrogen atmosphere.
Preferably, the pyrolysis in the step S3 is carried out at 500-900 ℃ for 1-3 hours.
Further preferably, the pyrolysis in step S3 is at 600-800℃for 1-3 hours.
It is further preferable that the pyrolysis in the step S3 is at 600-800 ℃ for 2 hours.
More preferably, the pyrolysis in step S3 is pyrolysis at 800 ℃ for 2 hours.
Preferably, the pyrolysis temperature in step S3 is increased at a rate of 8 to 12 ℃/min.
Further preferably, the pyrolysis temperature in step S2 is increased at a rate of 10 ℃/min.
The invention also provides the phosphorus directional adsorption biochar prepared by any one of the methods.
The phosphorus-oriented adsorption biochar of the invention can be used for the adsorption recovery of phosphorus to remarkably improve the recovery rate of phosphorus, and can be slowly released to realize the controlled release of phosphorus although the phosphorus exists in a precipitated form. Therefore, the invention also claims the application of the phosphorus directional adsorption biochar in phosphorus adsorption or preparation of phosphorus controlled release fertilizer.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a preparation method of directional adsorption biochar of phosphorus, which is different from the prior art in that raw materials are firstly mixed and immersed in magnesium chloride solution, and then are subjected to pyrolysis to prepare magnesium modified biochar after drying. While magnesium adsorbs phosphorus, although MgHPO is formed 4 And Mg (H) 2 HPO 4 ) 2 Belonging to the precipitation, but MgHPO 4 Or Mg (H) 2 HPO 4 ) 2 Is not a permanent precipitate and can be slowly released under a proper environment, so that the fertilizer can be further applied as a phosphorus controlled release fertilizer for plants. Compared with other phosphorus-adsorbed biochar, the phosphorus-adsorbed biochar has the advantages of simple preparation method, low-cost and easily-obtained raw materials, environment-friendly use, capability of overcoming the influence of the solubility of the modifier and the like. The method can obviously improve the recovery rate of the phosphorus when being used for the adsorption recovery of the phosphorus, and the phosphorus is slowly released due to the existence of the phosphorus in a precipitation form, so that the controlled release of the phosphorus is realized. The method is applied to the development of the phosphorus-adsorbed and phosphorus-controlled release fertilizer, and has important significance in relieving pollution of agricultural and forestry waste, pollution of phosphorus in wastewater, virtuous circle of nutrients and development of novel controlled release fertilizer.
Drawings
FIG. 1 shows the maximum adsorption amount of phosphorus of the directional adsorption biochar of phosphorus prepared by the invention.
FIG. 2 shows the effect of MRS-800-3 biochar prepared by the present invention on planting banana and citrus seedlings after phosphorus adsorption.
Detailed Description
The invention is further illustrated in the following drawings and specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
The preparation method of the directional adsorption biochar for phosphorus comprises the following steps:
(1) Washing rice straw with deionized water to remove surface dust, then placing in a blast drying oven at 80 ℃ for 24 hours, taking out after drying, and crushing to 0.5-1.0cm by a crusher.
(2) Uniformly mixing the biomass powder in the step (1) with MgO according to a mass ratio of 1:3 to obtain mixed biomass powder.
(3) And (3) placing the mixed biomass powder in the step (2) into a tube furnace, heating to 800 ℃ at a heating rate of 10 ℃/min under nitrogen atmosphere, pyrolyzing for 2 hours, naturally cooling to room temperature, filtering, drying, grinding and sieving to obtain the phosphorus-oriented adsorption biochar, and naming the phosphorus-oriented adsorption biochar as MRS-800-3.
Example 2
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the pyrolysis temperature in the step (3) is 500 ℃, and the obtained biochar is named MRS-500-3.
Example 3
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the pyrolysis temperature in the step (3) is 600 ℃, and the obtained biochar is named MRS-600-3.
Example 4
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the pyrolysis temperature in the step (3) is 700 ℃, and the obtained biochar is named MRS-700-3.
Example 5
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the pyrolysis temperature in the step (3) is 900 ℃, and the obtained biochar is named MRS-900-3.
Example 6
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the conventional waste biomass raw material in the step (1) is selected from corn stalks, and the obtained biochar is named as MCS-800-3.
Example 7
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: the conventional waste biomass raw material in the step (1) is selected from oil tea shells, and the obtained biochar is named MOT-800-3.
Example 8
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: and (3) selecting garden waste from the conventional waste biomass raw material in the step (1), wherein the obtained biochar is named as MGW-800-3.
Example 9
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: in the step (2), biomass powder and MgO are uniformly mixed according to a mass ratio of 1:1, and the obtained biochar is named MRS-800-1.
Example 10
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: in the step (2), biomass powder and MgO are uniformly mixed according to a mass ratio of 1:2, and the obtained biochar is named MRS-800-2.
Example 11
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: in the step (2), biomass powder and MgO are uniformly mixed according to a mass ratio of 1:4, and the obtained biochar is named MRS-800-4.
Comparative example 1
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: in the step (2), the biomass powder and MgO are uniformly mixed according to the mass ratio of 1:0, and the obtained biochar is named MRS-800-0.
Comparative example 2
The specific operation process of the preparation method of the phosphorus directional adsorption biochar is basically the same as that of the embodiment 1, except that: in the step (2), respectively weighing biomass powder and MgCl according to the mass ratio of 1:7.13 2 (ensuring the content of Mg consistent with that of MgO in example 1), mgCl 2 After being dissolved in deionized water, the biomass powder is placed in the solution to be soaked for 24 hours, then the soaked biomass powder is obtained through filtration, and the biomass powder is dried and then is used for pyrolysis in the step (3). The obtained biochar is named MRS-MgCl 2 。
Test example 1
The test example is a performance test for testing the prepared biochar, and specifically comprises the following two aspects:
1. the relative content of magnesium in the phosphorus-oriented adsorption biochar prepared in all examples and comparative examples was detected by an X-ray photoelectron spectrometer.
The relative content of magnesium in the biochar was examined and found that the biochar MRS-800-3 prepared in example 1 had a magnesium content of about 22.2%, slightly lower than MRS-800-4 (22.81%) prepared in example 11, but significantly higher than MRS-500-3 (13.47%), MRS-600-3 (13.48%), MRS-700-3 (17.1%), MRS-900-3 (12.9%), MCS-800-3 (10.5%), MOT-800-3 (10.7%), MGW-800-3 (11.7%), MRS-800-1 (7.3%), MRS-800-2 (7.1%) and comparative MRS-800-0 (0.11%), MRS-MgCl 2 (13.23%); the pyrolysis temperature, the biomass species and the mixing mass ratio of magnesium oxide to biomass are obviously influenced on the content change of magnesium in the prepared biochar. In addition, in the preparation process of the mixed biomass powder, the magnesium content in the prepared phosphorus directional adsorption biochar is obviously increased by increasing the magnesium oxide content, the magnesium content is equivalent when the mixing mass ratio of biomass to magnesium oxide is 1:3 and 1:4, and the preparation cost is increased by considering that the magnesium oxide content is increased, so that the mixing mass ratio of biomass to magnesium oxide is 1:3, which is also considered to be the optimal mixing ratio. Among the four tested waste biomass raw materials, the phosphorus directional adsorption biochar prepared from rice straw is highest in magnesium content; meanwhile, the method for preparing the magnesium modified biochar by directly mixing biomass powder raw materials with magnesium oxide under the same conditions and then carrying out one-step pyrolysis is also described, and compared with the conventional method for preparing the magnesium modified biochar by firstly mixing the raw materials in a magnesium chloride solution uniformly, dipping, drying and then carrying out pyrolysis, the preparation process is simplified, and the magnesium loading capacity is increased.
2. The adsorption performance test of the directional adsorption biochar for phosphorus prepared in examples 1 to 11 and comparative examples 1 to 2 comprises the following steps:
(1) The phosphorus-oriented adsorption biochar prepared in examples 1 to 11 and comparative examples 1 to 2 was applied to adsorption of phosphorus in wastewater.
(2) And (3) applying the biochar with the adsorbed phosphorus obtained in the step (1) as a controlled release fertilizer to crop growth.
As a result, as shown in FIG. 1, the maximum equilibrium adsorption amount of phosphorus by MRS-800-4 (example 11) was about 28.91mg/g, slightly higher than that of MRS-800-3 prepared in example 1 by about 28.83mg/g, significantly higher than that of MRS-500-3 (example 2), MRS-600-3 (example 3), MRS-700-3 (example 4), MRS-900-3 (example 5), MCS-800-3 (example 6), MOT-800-3 (example 7), MGW-800-3 (example 8), MRS-800-1 (example 9), MRS-800-2 (example 10), MRS-800-0 (comparative example 1) and MRS-MgCl 2 6.30mg/g, 15.50mg/g, 24.17mg/g, 16.30mg/g, 21.82mg/g, 22.25mg/g, 24.77mg/g, 13.53mg/g, 15.27mg/g, 4.11mg/g, 15.33mg/g of (comparative example 2), and examples 1-11 are significantly higher than comparative example 1, which shows that the adsorption effect of the prepared biochar on phosphorus can be significantly improved by the mixed direct pyrolysis modification of magnesia and biomass; meanwhile, the result also shows that under the same condition, the direct pyrolysis after mixing magnesium oxide and biomass is obviously better than the existing conventional biological carbon obtained by modifying magnesium chloride in the adsorption effect on phosphorus, the pyrolysis temperature, the biomass type and the mixing mass ratio of magnesium oxide and biomass have obvious influence on the phosphorus adsorption performance of the prepared biological carbon, and the optimal preparation condition is considered when the pyrolysis temperature at 800 ℃ and the mixing mass ratio of rice straw biological carbon and biomass and magnesium oxide are 1:3 by comprehensively considering cost factors.
And then the biochar with adsorbed phosphorus is applied to planting banana and citrus seedlings, and the result is shown in figure 2, and the fact that the phosphorus-oriented adsorption biochar (MRS-800-3) with adsorbed phosphorus is applied can obviously promote the growth of citrus and banana under other conditions without changing compared with the condition that the same amount of phosphate fertilizer is directly applied; the invention shows that the phosphorus is slowly released after the phosphorus is adsorbed by the phosphorus oriented adsorption biochar, thereby realizing the controlled release of the phosphorus, being used as or preparing the phosphorus controlled release fertilizer and being more beneficial to the growth of crops.
Claims (10)
1. The preparation method of the directional adsorption biochar for phosphorus is characterized by comprising the following steps of:
s1, cleaning, drying and crushing waste biomass to obtain biomass powder;
s2, fully and uniformly mixing the biomass powder obtained in the step S1 with MgO according to the mass ratio of 1:1-4 to obtain mixed biomass powder;
s3, pyrolyzing the mixed biomass powder obtained in the step S2 at 500-900 ℃ for 1-3 h in an anoxic atmosphere, naturally cooling to room temperature, filtering, drying, grinding and sieving to obtain the biochar.
2. The method for preparing directional adsorption biochar according to claim 1, wherein the waste biomass in the step S1 is one or more of rice straw, corn straw, camellia oleifera shells or garden waste.
3. The method for preparing directional adsorption biochar according to claim 1, wherein the crushing in step S1 is performed to 0.5-1.0cm.
4. The method for preparing directional adsorption biochar according to claim 1, wherein the mass ratio of the biomass powder to MgO in the step S2 is 1:3-4.
5. The method for preparing directional adsorption biochar according to claim 4, wherein the mass ratio of the biomass powder to MgO in the step S2 is 1:3.
6. The method for preparing directional adsorption biochar according to claim 1, wherein the pyrolysis in the step S3 is performed at 500-900 ℃ for 2 hours.
7. The method for preparing directional adsorption biochar according to claim 6, wherein the pyrolysis in the step S3 is performed at 600-800 ℃ for 2 hours.
8. The method for producing a phosphorus-directed adsorption biochar according to claim 1, wherein the pyrolysis temperature in step S3 is raised at a temperature rising rate of 8 to 12 ℃/min.
9. The phosphorus-oriented adsorption biochar prepared by the preparation method of any one of claims 1 to 8.
10. The use of the directional phosphorus-adsorbing biochar according to claim 9 in phosphorus adsorption or in the preparation of a controlled-release fertilizer for phosphorus.
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| CN106006819A (en) * | 2016-07-01 | 2016-10-12 | 北京林业大学 | Method for dephosphorizing phosphorus wastewater and producing slow-release carbon-based phosphate fertilizer |
| US20180016162A1 (en) * | 2016-07-15 | 2018-01-18 | Board Of Supervisors Of Louisiana State University And Agricultural And Mechanical College | Magnetic Metal Oxide Biochar Composite Particles, and Their Use in Recovering Pollutants From Aqueous Solution |
| CN115028497A (en) * | 2022-06-10 | 2022-09-09 | 青岛大学 | Biochar-based phosphorus slow-release fertilizer for saline-alkali soil |
| CN115337904A (en) * | 2022-08-19 | 2022-11-15 | 华南农业大学 | Preparation method and application of magnesium-containing biochar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106006819A (en) * | 2016-07-01 | 2016-10-12 | 北京林业大学 | Method for dephosphorizing phosphorus wastewater and producing slow-release carbon-based phosphate fertilizer |
| US20180016162A1 (en) * | 2016-07-15 | 2018-01-18 | Board Of Supervisors Of Louisiana State University And Agricultural And Mechanical College | Magnetic Metal Oxide Biochar Composite Particles, and Their Use in Recovering Pollutants From Aqueous Solution |
| CN115028497A (en) * | 2022-06-10 | 2022-09-09 | 青岛大学 | Biochar-based phosphorus slow-release fertilizer for saline-alkali soil |
| CN115337904A (en) * | 2022-08-19 | 2022-11-15 | 华南农业大学 | Preparation method and application of magnesium-containing biochar |
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