CN114276817B - Soil restoration agent and preparation method and application thereof - Google Patents
Soil restoration agent and preparation method and application thereof Download PDFInfo
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- CN114276817B CN114276817B CN202111656411.2A CN202111656411A CN114276817B CN 114276817 B CN114276817 B CN 114276817B CN 202111656411 A CN202111656411 A CN 202111656411A CN 114276817 B CN114276817 B CN 114276817B
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- 239000002689 soil Substances 0.000 title claims abstract description 60
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 144
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- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 13
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- 238000000498 ball milling Methods 0.000 claims description 47
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 24
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 20
- 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 claims description 20
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- 229960001545 hydrotalcite Drugs 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000005067 remediation Methods 0.000 claims description 15
- 239000011259 mixed solution Substances 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 238000009835 boiling Methods 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 7
- 159000000003 magnesium salts Chemical class 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
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- 230000000052 comparative effect Effects 0.000 description 7
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- 229910021641 deionized water Inorganic materials 0.000 description 7
- 239000012153 distilled water Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000002386 leaching Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
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- 229910019142 PO4 Inorganic materials 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a soil restoration agent and a preparation method and application thereof. The invention provides a soil restoration agent, which comprises the following components in parts by weight: 60-80 parts of citric acid modified bagasse and 10-15 parts of hydrotalcite-like compound. According to the invention, citric acid modified bagasse and hydrotalcite-like compound are compounded, and interaction of the citric acid modified bagasse and hydrotalcite-like compound can increase the effects of precipitation and complexing of heavy metals, so that the adsorption effect of heavy metal cadmium is remarkably improved, and the pH of the composite material can be regulated, so that the problems of low pH of the modified material and limited adsorption performance of the hydrotalcite-like compound material are solved.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a soil restoration agent and a preparation method and application thereof.
Background
The cadmium element has strong mobility, large biological enrichment coefficient, easy absorption and durable toxicity. Cadmium in the farmland affects plant growth, reducing crop yield and quality. In addition, cadmium accumulated in the edible parts of crops can finally enter human bodies through food chains, and the health of the human bodies is endangered. Therefore, how to treat cadmium-polluted soil, reduce the enrichment of cadmium-polluted soil in the edible parts of crops, improve the yield and quality of crops and bring great attention.
Currently, the cadmium pollution repair materials which are commonly used include alkaline improvers (lime, magnesia and the like), clay minerals (zeolite, sepiolite and the like), phosphates (calcium magnesia phosphate fertilizer, superphosphate and the like), organic matters (biochar, organic compost and the like) and the like. However, the above-mentioned modifier is high in cost and has limited soil restoration effect.
The organic waste is a byproduct of crop harvesting or food processing, and is a heavy metal solidification and stabilization material capable of replacing the traditional adsorbent. The bagasse is a meta-acid sugar industry waste with adsorption performance, but has poor adsorption stability, generally lower adsorption capacity to heavy metals, and is easy to decompose by microorganisms to cause secondary pollution to the environment, so that the application of the bagasse in soil remediation is greatly limited.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the existing soil restoration agent adopts natural bagasse to have limited restoration effect on cadmium-polluted soil, and further provide a soil restoration agent and a preparation method and application thereof.
The invention provides a soil restoration agent, which comprises the following components in parts by weight: 60-80 parts of citric acid modified bagasse and 10-15 parts of hydrotalcite-like compound.
Preferably, the preparation method of the citric acid modified bagasse comprises the following steps:
1) Mixing bagasse and water, boiling, soaking and drying to obtain pretreated bagasse;
2) And mixing the pretreated bagasse with citric acid, and performing ball milling on the obtained mixture to obtain the citric acid modified bagasse.
Preferably, in the step 1), the mass ratio of bagasse to water is (58-82): 60-70;
in the step 2), the mass ratio of the pretreated bagasse to the citric acid is (59-83): 5-10;
in the step 1), the boiling time is 45-60min, the soaking step adopts water for soaking, the drying temperature is 100-120 ℃, and the drying time is 2-2.5h;
in the step 2), the ball milling is wet ball milling, and in the wet ball milling, the mass ratio of the mixed material, the grinding balls and the solvent is (60-90) (3500-4500) (10-13); preferably, the solvent is ethanol, the ball milling rotating speed is 400-550rpm, and the ball milling time is 1.5-2.5h;
and step 2), after ball milling, washing, drying, grinding and sieving the ball milling product.
Preferably, the soaking time of the step 1) is 1-2 hours; in the step 2), the particle size of the grinding ball is 5-10mm, and the ball milling direction conversion frequency is 4-6 min/time; in the step 2), the drying temperature is 100-120 ℃ and the drying time is 0.5-1h.
Preferably, the hydrotalcite-like compound comprises magnesium aluminum hydrotalcite.
Preferably, the preparation method of the magnesium aluminum hydrotalcite comprises the following steps:
mixing the mixed solution of magnesium salt and aluminum salt with alkali solution for reaction, standing after the reaction is finished, filtering, washing, drying and grinding to obtain the magnesium aluminum hydrotalcite.
Preferably, the step of mixing the mixed solution of magnesium salt and aluminum salt with the alkali solution for reaction is as follows: the mixed solution and the alkali solution are simultaneously dripped into water for reaction.
Preferably, the volume ratio of the mixed solution to the alkali solution to the water is (30-50): (50-70): (70-80).
Preferably, the volume ratio of the mixed solution to the alkali solution is (30-50): 50-70.
Preferably, the solvent of the mixed solution is water, and the magnesium salt is Mg (NO 3 ) 2 The aluminum salt is Al (NO) 3 ) 3 The concentration of magnesium salt in the mixed solution is (0.18-0.25) mol/L, and the concentration of aluminum salt is (0.09-0.12) mol/L;
the alkali solution is NaOH aqueous solution, and the concentration of the NaOH aqueous solution is (0.5-0.7) mol/L.
Preferably, the reaction temperature of the mixing reaction is 20-25 ℃ and the reaction time is 8 hours; standing at 20-25deg.C for 10-15 hr; washing with water; drying is performed in a freeze dryer.
The invention also provides a preparation method of the soil restoration agent, which comprises the following steps: mixing citric acid modified bagasse and hydrotalcite-like compound.
The invention also provides application of the soil restoration agent or the soil restoration agent prepared by the preparation method in restoration of heavy metal contaminated soil.
Preferably, the heavy metal is cadmium.
The technical scheme of the invention has the following advantages:
1. the invention provides a soil restoration agent, which comprises the following components: 60-80 parts of citric acid modified bagasse and 10-15 parts of hydrotalcite-like compound. The number of active sites (carboxyl functional groups) on the surface of the bagasse after the citric acid modification can be greatly increased, the structure of the hydrotalcite-like material is mainly formed by multi-stacking reaction of interlayer anions, the hydrotalcite-like material is alkaline, the hydrotalcite-like material is formed by rich hydroxyl groups and interlayer anions, and the hydrotalcite-like material can be subjected to precipitation reaction with cadmium ions, but the adsorption capacity of the hydrotalcite-like material can be limited in the reaction process due to the compact stacking structure and light property of the hydrotalcite-like material.
2. The preparation method of the repairing agent provided by the invention further comprises the following steps: mixing bagasse and water, boiling, soaking and drying to obtain pretreated bagasse; and mixing the pretreated bagasse with citric acid, and performing ball milling on the obtained mixture to obtain the citric acid modified bagasse. According to the invention, the bagasse is pretreated and then ball-milled with the citric acid, so that the modification of the citric acid on the bagasse can be accelerated by ball milling, and meanwhile, the mechanochemical force generated in the ball milling process has the effects of increasing the specific surface area of the bagasse and increasing the oxygen-containing functional groups, thereby being beneficial to improving the adsorption and passivation effects of the modified material on heavy metals. Compared with the conventional means of ultrasonic treatment, grinding, citric acid soaking and the like, the citric acid modified bagasse obtained by ball milling the pretreated bagasse and citric acid can further improve the adsorption effect of the citric acid modified bagasse on heavy metal cadmium. Meanwhile, the obtained citric acid modified bagasse has uniform particle size, is a micro-nano material, is easy to produce in batches, and has the advantages of economy and easy realization of required equipment and preparation process, no need of heating and pH adjustment.
3. According to the repairing agent provided by the invention, the ball milling is performed by a wet method, the solvent is ethanol in the wet method, so that citric acid crystal grains can be dissolved into the ethanol, meanwhile, the ball milling efficiency is improved, the ball milling time is shortened, the defect that solid dust is easy to generate in the process of separating materials from grinding media is overcome, and the production process is cleaner and environment-friendly. Meanwhile, compared with other solvents such as water, the ethanol can play a role in reducing temperature and preventing adhesion in the ball milling process.
4. Compared with the conventional treatment of ball milling all materials, the repairing agent provided by the invention has the advantages that the bagasse and citric acid are ball-milled and modified and then mixed with hydrotalcite-like compound, so that the action advantages of all materials can be fully exerted, and the passivation effect is enhanced.
5. According to the preparation method of the repairing agent, the bagasse after citric acid modification is directly mixed with the alkaline light material magnesium aluminum hydrotalcite to prepare the composite material, so that the operation is simple and convenient, and industrial production can be carried out.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
The embodiment provides a soil remediation agent, which comprises the following raw materials: 73g of citric acid modified bagasse and 10g of magnesium aluminum hydrotalcite.
The preparation method of the citric acid modified bagasse comprises the following steps:
1) Mixing 80g of bagasse and 75g of distilled water, boiling for 50min, soaking the boiled bagasse in deionized water for 2h, transferring the soaked bagasse into an oven, and drying at 100 ℃ for 2h to obtain pretreated bagasse;
2) Transferring 80g of pretreated bagasse, 8g of citric acid, 10g of ethanol and 4000g of agate balls into a ball mill for ball milling, wherein the diameter of the agate balls is 6mm, the ball milling rotating speed is 500rpm, the ball milling time is 2h, the ball milling direction conversion frequency is 5 min/time, after ball milling, washing the ball milling product with water, then placing the ball milling product into an oven, drying for 2h at 105 ℃, grinding and sieving to obtain the citric acid modified bagasse.
The preparation method of the magnesium aluminum hydrotalcite comprises the following steps:
25.6g of Mg (NO 3 ) 2 ·6H 2 O、18.8g Al(NO 3 ) 3 ·9H 2 O, 500ml deionized water to obtain Mg (NO) 3 ) 2 And Al (NO) 3 ) 3 Then 200mL of the mixed solution and sodium hydroxide aqueous solution (the concentration of the NaOH aqueous solution is 0.6mol/L, and the volume of the NaOH aqueous solution is 300 mL) are slowly added into a 1000mL three-port round-bottom flask containing 300mL of distilled water in a dropwise manner at the same time for reaction, the reaction temperature is 25 ℃, the reaction time is 2h, the reaction is finished, the reaction is kept at room temperature for 12h, then the product is filtered by suction, washed with water to be neutral, the product is transferred into a freeze dryer for freeze drying, and the product is ground after the drying is finished, so that the magnesium aluminum hydrotalcite is obtained.
The preparation method of the soil restoration agent comprises the following steps: and (3) placing 73g of citric acid modified bagasse and 10g of magnesium aluminum hydrotalcite into a V-shaped mixer to be uniformly mixed, thus obtaining the soil restoration agent.
Example 2
The embodiment provides a soil remediation agent, which comprises the following raw materials: 65g of citric acid modified bagasse and 14g of magnesium aluminum hydrotalcite.
The preparation method of the citric acid modified bagasse comprises the following steps:
1) Mixing 80g of bagasse and 75g of distilled water, boiling for 50min, soaking the boiled bagasse in deionized water for 2h, transferring the soaked bagasse into an oven, and drying at 100 ℃ for 2h to obtain pretreated bagasse;
2) Transferring 80g of pretreated bagasse, 8g of citric acid, 10g of ethanol and 4000g of agate balls into a ball mill for ball milling, wherein the diameter of the agate balls is 6mm, the ball milling rotating speed is 500rpm, the ball milling time is 2h, the ball milling direction conversion frequency is 5 min/time, after ball milling, washing the ball milling product with water, then placing the ball milling product into an oven, drying for 2h at 105 ℃, grinding and sieving to obtain the citric acid modified bagasse.
The preparation method of the magnesium aluminum hydrotalcite comprises the following steps:
25.6g of Mg (NO 3 ) 2 ·6H 2 O、18.8g Al(NO 3 ) 3 ·9H 2 O, 500ml deionized water to obtain Mg (NO) 3 ) 2 And Al (NO) 3 ) 3 Then 200mL of the mixed solution and sodium hydroxide aqueous solution (the concentration of the NaOH aqueous solution is 0.6mol/L, and the volume of the NaOH aqueous solution is 300 mL) are slowly added into a 1000mL three-port round-bottom flask containing 300mL of distilled water in a dropwise manner at the same time for reaction, the reaction temperature is 25 ℃, the reaction time is 2h, the reaction is finished, the reaction is kept at room temperature for 12h, then the product is filtered by suction, washed with water to be neutral, the product is transferred into a freeze dryer for freeze drying, and the product is ground after the drying is finished, so that the magnesium aluminum hydrotalcite is obtained.
The preparation method of the soil restoration agent comprises the following steps: and (3) placing 65g of citric acid modified bagasse and 14g of magnesium aluminum hydrotalcite into a V-shaped mixer for uniformly mixing to obtain the soil restoration agent.
Example 3
The embodiment provides a soil remediation agent, which comprises the following raw materials: 78g of citric acid modified bagasse and 15g of magnesium aluminum hydrotalcite.
The preparation method of the citric acid modified bagasse comprises the following steps:
1) Mixing 80g of bagasse and 75g of distilled water, boiling for 50min, soaking the boiled bagasse in deionized water for 2h, transferring the soaked bagasse into an oven, and drying at 100 ℃ for 2h to obtain pretreated bagasse;
2) Transferring 80g of pretreated bagasse, 8g of citric acid, 10g of ethanol and 4000g of agate balls into a ball mill for ball milling, wherein the diameter of the agate balls is 6mm, the ball milling rotating speed is 500rpm, the ball milling time is 2h, the ball milling direction conversion frequency is 5 min/time, after ball milling, washing the ball milling product with water, then placing the ball milling product into an oven, drying for 2h at 105 ℃, grinding and sieving to obtain the citric acid modified bagasse.
The preparation method of the magnesium aluminum hydrotalcite comprises the following steps:
25.6g of Mg (NO 3 ) 2 ·6H 2 O、18.8g Al(NO 3 ) 3 ·9H 2 O, 500ml deionized water to obtain Mg (NO) 3 ) 2 And Al (NO) 3 ) 3 Then 200mL of the mixed solution and sodium hydroxide aqueous solution (the concentration of the NaOH aqueous solution is 0.6mol/L, and the volume of the NaOH aqueous solution is 300 mL) are slowly added into a 1000mL three-port round-bottom flask containing 300mL of distilled water in a dropwise manner at the same time for reaction, the reaction temperature is 25 ℃, the reaction time is 2h, the reaction is finished, the reaction is kept at room temperature for 12h, then the product is filtered by suction, washed with water to be neutral, the product is transferred into a freeze dryer for freeze drying, and the product is ground after the drying is finished, so that the magnesium aluminum hydrotalcite is obtained.
The preparation method of the soil restoration agent comprises the following steps: and (3) placing 78g of citric acid modified bagasse and 15g of magnesium aluminum hydrotalcite into a V-shaped mixer for uniformly mixing to obtain the soil restoration agent.
Example 4
The present embodiment provides a soil restoration agent, which is different from embodiment 1 in that the preparation method of the citric acid modified bagasse includes the following steps:
1) Mixing 80g of bagasse and 75g of distilled water, boiling for 50min, soaking the boiled bagasse in deionized water for 2h, transferring the soaked bagasse into an oven, and drying at 100 ℃ for 2h to obtain pretreated bagasse;
2) 80g of pretreated bagasse is soaked in 100ml of 0.42mol/L citric acid solution, the stirring speed is 500rpm, the stirring time is 2 hours, after stirring, the product is washed with water, then the product is placed in an oven, dried for 2 hours at 105 ℃, and the citric acid modified bagasse is obtained after grinding and sieving.
Comparative example 1:
this comparative example provides a soil restoration agent that differs from example 1 in that only 83g of citric acid modified bagasse was used.
Comparative example 2:
this comparative example provides a soil restoration agent which differs from example 1 in that only 83g of magnesium aluminum hydrotalcite was used.
Test case
The soil remediation agents obtained in examples 1 to 4 and comparative examples 1 and 2 were subjected to performance test for remediation of heavy metal contaminated soil, and the specific test method was as follows:
the test cadmium contaminated soil used in examples 1-4 and comparative examples 1 and 2 was all the same specification soil weighing 0.5kg and cadmium leaching concentration 9.25mg/L (measured by HJ/T299-2007 standard).
The soil restoration agents prepared in examples 1 to 4 and comparative examples 1 and 2 were added to the soil at 2%, 3%, 4% and 5% of the mass of the cadmium-contaminated soil, respectively, and the soil moisture content was adjusted to 20%, and the soil was maintained for 28 days. The cadmium leaching concentration is lower than 0.6mg/L according to the requirements of the pollution control standard (GB 18598-2019) of hazardous waste landfill. The results after curing are shown in Table 1.
Cadmium passivation = (leaching concentration of cadmium in initial contaminated soil-leaching concentration of cadmium in post-remediation soil)/leaching concentration of cadmium in initial contaminated soil x 100%.
The test results are shown in Table 1:
TABLE 1 cadmium leaching concentration and corresponding passivation rate in soil after 28 days of curing
As can be seen from the data in the table, the soil remediation agent provided by the invention has the advantages that the solidification effect on cadmium is obviously improved when the soil remediation agent is used for remediating heavy metal contaminated soil, the remediation period is short, the operation is simple, the industrial production can be realized, and the soil remediation agent is suitable for remediation of large-area heavy metal contaminated soil; and the stabilizing (solidifying) effect of the soil restoration agent is increased along with the increase of the addition amount of the soil restoration agent, and when the addition amount reaches 4%, the requirement of the pollution control standard (GB 18598-2019) of hazardous waste landfill can be met.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The soil remediation agent is characterized by comprising the following components in parts by weight: 60-80 parts of citric acid modified bagasse and 10-15 parts of hydrotalcite-like compound;
the preparation method of the citric acid modified bagasse comprises the following steps:
1) Mixing bagasse and water, boiling, soaking and drying to obtain pretreated bagasse;
2) Mixing the pretreated bagasse with citric acid, and performing ball milling on the obtained mixture to obtain the citric acid modified bagasse;
wherein the ball milling is wet ball milling.
2. The soil restoration agent according to claim 1, wherein in step 1), the mass ratio of bagasse to water is (58-82): 60-70;
in the step 2), the mass ratio of the pretreated bagasse to the citric acid is (59-83): 5-10;
in the step 1), the boiling time is 45-60min, the soaking step adopts water for soaking, the drying temperature is 100-120 ℃, and the drying time is 2-2.5h;
in the step 2), in the wet ball milling, the mass ratio of the mixed material, the grinding balls and the solvent is (60-90): (3500-4500): (10-13);
and step 2), after ball milling, washing, drying, grinding and sieving the ball milling product.
3. The soil remediation agent of claim 2 wherein in step 2) the solvent in the wet ball milling is ethanol at a ball milling speed of 400-550rpm for a period of 1.5-2.5 hours.
4. The soil remediation agent of claim 1 wherein the hydrotalcite-like compound comprises magnesium aluminum hydrotalcite.
5. The soil restoration agent according to claim 4, wherein the preparation method of the magnesium aluminum hydrotalcite comprises the following steps:
mixing the mixed solution of magnesium salt and aluminum salt with alkali solution for reaction, standing after the reaction is finished, filtering, washing, drying and grinding to obtain the magnesium aluminum hydrotalcite.
6. The soil restoration agent according to claim 5, wherein the volume ratio of said mixed solution to said alkali solution is (30-50): (50-70);
the alkali solution is NaOH aqueous solution, and the concentration of the NaOH aqueous solution is (0.5-0.7) mol/L.
7. The soil restoration agent according to claim 6, wherein the solvent of said mixed solution is water, and said magnesium salt is Mg (NO 3 ) 2 The aluminum salt is Al (NO) 3 ) 3 The concentration of magnesium salt in the mixed solution is (0.18-0.25) mol/L, and the concentration of aluminum salt is (0.09-0.12) mol/L.
8. A method of preparing a soil restoration agent as defined in any one of claims 1 to 7, comprising the steps of: mixing citric acid modified bagasse and hydrotalcite-like compound.
9. Use of a soil restoration agent according to any one of claims 1 to 7 or a soil restoration agent prepared by the preparation method according to claim 8 in restoration of heavy metal contaminated soil.
10. The use according to claim 9, wherein the heavy metal is cadmium.
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