CN111961476B - Soil passivator for landscaping and preparation method thereof - Google Patents
Soil passivator for landscaping and preparation method thereof Download PDFInfo
- Publication number
- CN111961476B CN111961476B CN202010901762.4A CN202010901762A CN111961476B CN 111961476 B CN111961476 B CN 111961476B CN 202010901762 A CN202010901762 A CN 202010901762A CN 111961476 B CN111961476 B CN 111961476B
- Authority
- CN
- China
- Prior art keywords
- stirring
- prefabricated material
- landscaping
- soil
- soil passivator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2101/00—Agricultural use
Abstract
The invention discloses a soil passivator for landscaping. The invention also discloses a preparation method of the soil passivator, which comprises the following steps: mixing montmorillonite and bamboo charcoal powder, drying, grinding, sieving, adding into nitric acid solution, stirring, performing ultrasonic treatment during stirring, filtering, washing with water to neutral, drying to constant weight, performing ultrasonic treatment during drying, pulverizing, and sieving to obtain a prefabricated material a; dissolving chitosan in an acetic acid aqueous solution, adding dodecyl trimethyl ammonium chloride, uniformly stirring, adding the prefabricated material a, and stirring to obtain a prefabricated material b; adding acrylamide into the prefabricated material b, uniformly stirring, continuously adding a cross-linking agent and an initiator under the stirring state, and stirring to obtain a prefabricated material c; and (3) placing the prefabricated material c into a microwave tube type electric furnace, introducing nitrogen for protection, firstly heating to 180-class temperature of 200 ℃, preserving heat for 10-20min, heating to 240-class temperature of 300 ℃, preserving heat for 5-10min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Description
Technical Field
The invention relates to the technical field of landscaping, in particular to a soil passivator for landscaping and a preparation method thereof.
Background
The soil is a main material foundation for human life and a life survival foundation, but with the continuous expansion of industrial production scale and the rapid development of urbanization in China, the soil is polluted by heavy metals of different degrees, so that a lot of heavy metals enter the atmosphere, water and soil, and serious environmental pollution is caused. The heavy metal pollution of soil constitutes a potential huge threat to the ecological system of urban gardens due to the characteristics of concealment, irreversibility and long-term property, influences the health of human bodies and animals through a food chain, seriously influences the environmental quality and the sustainable development of economy, and gradually realizes the severity of the heavy metal pollution by human beings. Therefore, the method has important significance in finding an effective and reasonable method for treating and repairing heavy metal pollution.
At present, heavy metal pollution in urban gardens becomes one of serious environmental problems, and in the environmental pollution research, heavy metals mostly refer to chemical elements with significant biological toxicity, such as Hg, Cd, Pb, Cr and the like. The simple substance chromium (Cr) is a stable metal, and can be widely used for manufacturing stainless steel, automobile parts, tools, magnetic tapes, video tapes and the like, and chromium plated on the metal can prevent rust, is firm and beautiful, but is an environmental pollutant with the characteristics of high toxicity, no degradation, biological enrichment and the like, and particularly can damage the nervous system of a human body.
The existing passivation material for treating the garden polluted soil is not only easy to cause soil hardening and influence the planting function of the soil, but also the passivant cannot exist stably in the nature for a long time, and the passivation efficiency is too low, thus urgent solution is needed.
Disclosure of Invention
Based on the technical problems in the background art, the soil passivator for landscaping and the preparation method thereof are provided, the soil passivator for landscaping is large in specific surface area, high in mechanical strength and high in pressure resistance, and is beneficial to adsorption of heavy metal elemental chromium on one hand, and high in stability on the other hand, and can achieve the effect of improving soil and preventing soil from hardening when applied to the soil.
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing montmorillonite and bamboo charcoal powder, drying, grinding and sieving, adding into nitric acid solution, stirring at 80-90 ℃ for 20-40min, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 70-80 ℃ to constant weight, performing ultrasonic treatment during drying, crushing and sieving to obtain a prefabricated material a;
s2, dissolving chitosan in an acetic acid aqueous solution, adding dodecyl trimethyl ammonium chloride, uniformly stirring, adding the prefabricated material a, and stirring for 2-4 hours at the stirring temperature of 80-90 ℃ to obtain a prefabricated material b;
s3, adding acrylamide into the prefabricated material b, uniformly stirring, continuously adding the cross-linking agent and the initiator under the stirring state, and stirring for 5-15min at the stirring temperature of 75-85 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, firstly heating to 180-.
Preferably, in S1, the mass ratio of montmorillonite to bamboo charcoal powder is 30-50: 5-15.
Preferably, in S1, the concentration of the nitric acid solution is 2.5-3.5mol/L, and the solid-to-liquid ratio is 1: 2.5-3.2.
Preferably, in S2, the mass fraction of the acetic acid aqueous solution is 0.4-1%, and the mass ratio of the chitosan to the acetic acid aqueous solution is 4-8: 100.
preferably, in S2, the mass ratio of chitosan to dodecyltrimethylammonium chloride to the preform a is 4-8: 0.1-0.2: 40-60.
Preferably, in S2, the deacetylation degree of chitosan is greater than or equal to 98%, and the viscosity is 600-700 mPas.
Preferably, in S3, the mass ratio of the preform b, the acrylamide, the crosslinking agent and the initiator is 45-65: 3-6: 0.01-0.02: 0.1-0.2.
Preferably, in S3, the crosslinking agent is N, N' -methylenebisacrylamide.
Preferably, in S3, the initiator is potassium persulfate.
Preferably, in S4, the temperature is raised to 180-200 ℃ at a rate of 4-10 ℃/min.
Preferably, in S4, the temperature is raised to 240-300 ℃ at a speed of 12-14 ℃/min.
A soil passivator for landscaping is prepared by the preparation method of the soil passivator for landscaping.
The technical effects of the invention are as follows:
in the invention S1, montmorillonite and bamboo charcoal powder are treated by nitric acid to dissolve impurities in pore channel structure, especially ultrasonic treatment is assisted to effectively remove cation adsorbed in pore channel structure of combined water and crystal in skeleton, so that pore channel of prefabricated material a is fully dredged, large pore structure has good permeability, chitosan dissolved in acetic acid aqueous solution flows through, the prefabricated material a has uniform physical adsorption and high adsorption strength to chitosan, acrylamide is further permeated into and out of prefabricated material b to form a network structure through chemical crosslinking, the product is calcined by a microwave tubular electric furnace, the internal and external temperature of the material can be controlled and fully permeated into the material in the rapid heating process, meanwhile, the material is self-heated in the microwave heating process, the calcination temperature can be effectively reduced, the obtained product has a honeycomb structure, not only is high in porosity, but also has fine and uniform structure, meanwhile, three-dimensional frameworks formed in the honeycomb structure are inserted together, wherein the chitosan still keeps larger specific surface area, the obtained product has higher mechanical strength and stronger compressive capacity, and is beneficial to the adsorption of heavy metal elemental chromium on one hand, and has extremely high stability on the other hand, and the effect of improving soil and preventing soil from hardening is achieved when the chitosan is applied to the soil.
The invention overcomes the defects of low adsorption efficiency and low utilization rate of the adsorption material for treating heavy metal (Cr) wastewater in the prior art, the obtained passivator is porous honeycomb, has large specific surface area, greatly improves the adsorption performance, particularly has high adsorption strength to chromium, is used for repairing heavy metal chromium-polluted soil, can greatly reduce the treatment cost of the polluted soil, and has economic value and environmental protection significance.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 30kg of montmorillonite and 15kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 2.5mol/L, and controlling the solid-to-liquid ratio to be 1: 3.2, stirring for 40min at 80 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 70 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 8kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 600mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.4%, adding 0.2kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 40kg of prefabricated material a, stirring for 4h at the stirring temperature of 80 ℃ to obtain prefabricated material b;
s3, adding 3kg of acrylamide into 65kg of the prefabricated material b, uniformly stirring, continuously adding 0.02kg of N, N' -methylene bisacrylamide and 0.1kg of potassium persulfate under the stirring state, and stirring for 15min at the stirring temperature of 75 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 180 ℃ at the speed of 10 ℃/min, preserving heat for 20min, continuing heating to 300 ℃ at the speed of 12 ℃/min, preserving heat for 5min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Example 2
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 50kg of montmorillonite and 5kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3.5mol/L, and controlling the solid-to-liquid ratio to be 1: 2.5, stirring for 20min at 90 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 80 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 4kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 700mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 1%, adding 0.1kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 60kg of prefabricated material a, stirring for 2h at the stirring temperature of 90 ℃ to obtain prefabricated material b;
s3, adding 6kg of acrylamide into 45kg of the prefabricated material b, uniformly stirring, continuously adding 0.01kg of N, N' -methylene bisacrylamide and 0.2kg of potassium persulfate under the stirring state, and stirring for 5min at the stirring temperature of 85 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 200 ℃ at a speed of 4 ℃/min, preserving heat for 10min, continuing heating to 240 ℃ at a speed of 14 ℃/min, preserving heat for 10min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Example 3
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 35kg of montmorillonite and 12kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 2.8mol/L, and controlling the solid-to-liquid ratio to be 1: stirring for 35min at the temperature of 3 and 82 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at the temperature of 73 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 7kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 620mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.6%, adding 0.17kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 45kg of the prefabricated material a, stirring for 3.5h at the stirring temperature of 82 ℃ to obtain a prefabricated material b;
s3, adding 4kg of acrylamide into 60kg of the prefabricated material b, uniformly stirring, continuously adding 0.018kg of N, N' -methylene bisacrylamide and 0.13kg of potassium persulfate under the stirring state, and stirring for 12min at the stirring temperature of 78 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 185 ℃ at the speed of 8 ℃/min, preserving heat for 18min, continuing heating to 280 ℃ at the speed of 12.5 ℃/min, preserving heat for 6min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Example 4
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 45kg of montmorillonite and 8kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3.2mol/L, and controlling the solid-to-liquid ratio to be 1: 2.6, stirring for 25min at 88 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 77 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 5kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 680mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.8%, adding 0.13kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 55kg of the prefabricated material a, stirring for 2.5h at the stirring temperature of 88 ℃ to obtain a prefabricated material b;
s3, adding 5kg of acrylamide into 50kg of the prefabricated material b, uniformly stirring, continuously adding 0.012kg of N, N' -methylene bisacrylamide and 0.17kg of potassium persulfate under the stirring state, and stirring for 8min at the stirring temperature of 82 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 195 ℃ at the speed of 6 ℃/min, preserving heat for 12min, continuing heating to 260 ℃ at the speed of 13.5 ℃/min, preserving heat for 8min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Example 5
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 40kg of montmorillonite and 10kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3mol/L, and controlling the solid-to-liquid ratio to be 1: 2.8, stirring for 30min at 85 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 75 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 6kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 650mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.7%, adding 0.15kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 50kg of prefabricated material a, stirring for 3h at the stirring temperature of 85 ℃, and obtaining prefabricated material b;
s3, adding 4.5kg of acrylamide into 55kg of the prefabricated material b, uniformly stirring, continuously adding 0.015kg of N, N' -methylene bisacrylamide and 0.15kg of potassium persulfate under the stirring state, and stirring for 10min at the stirring temperature of 80 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Comparative example 1
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, dissolving 6kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 650mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.7%, adding 0.15kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 50kg of calcined montmorillonite, and stirring for 3h at the stirring temperature of 85 ℃ to obtain a prefabricated material b;
s2, adding 4.5kg of acrylamide into 55kg of the prefabricated material b, uniformly stirring, continuously adding 0.015kg of N, N' -methylene bisacrylamide and 0.15kg of potassium persulfate under the stirring state, and stirring for 10min at the stirring temperature of 80 ℃ to obtain a prefabricated material c;
s3, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Comparative example 2
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 40kg of montmorillonite and 10kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3mol/L, and controlling the solid-to-liquid ratio to be 1: 2.8, stirring for 30min at 85 ℃, filtering, washing with water to be neutral, drying to constant weight at 75 ℃, performing ultrasonic treatment in the drying process, crushing and sieving by a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 6kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 650mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.7%, adding 0.15kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 50kg of prefabricated material a, stirring for 3h at the stirring temperature of 85 ℃, and obtaining prefabricated material b;
s3, adding 4.5kg of acrylamide into 55kg of the prefabricated material b, uniformly stirring, continuously adding 0.015kg of N, N' -methylene bisacrylamide and 0.15kg of potassium persulfate under the stirring state, and stirring for 10min at the stirring temperature of 80 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Comparative example 3
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 40kg of montmorillonite and 10kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3mol/L, and controlling the solid-to-liquid ratio to be 1: 2.8, stirring for 30min at 85 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 75 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, adding 4.5kg of acrylamide into 55kg of the prefabricated material a, uniformly stirring, continuously adding 0.015kg of N, N' -methylene bisacrylamide and 0.15kg of potassium persulfate under the stirring state, and stirring for 10min at the stirring temperature of 80 ℃ to obtain a prefabricated material c;
s3, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Comparative example 4
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 40kg of montmorillonite and 10kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3mol/L, and controlling the solid-to-liquid ratio to be 1: 2.8, stirring for 30min at 85 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 75 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 6kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 650mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.7%, adding 0.15kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 50kg of prefabricated material a, stirring for 3h at the stirring temperature of 85 ℃, and obtaining prefabricated material b;
s3, placing the prefabricated material b into a microwave tube electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Comparative example 5
A preparation method of a soil passivator for landscaping comprises the following steps:
s1, mixing 40kg of montmorillonite and 10kg of bamboo charcoal powder, drying, grinding, sieving with a 200-mesh sieve, adding into a nitric acid solution with the concentration of 3mol/L, and controlling the solid-to-liquid ratio to be 1: 2.8, stirring for 30min at 85 ℃, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 75 ℃ to constant weight, performing ultrasonic treatment during drying, crushing, and sieving with a 100-mesh sieve to obtain a prefabricated material a;
s2, dissolving 6kg of chitosan with deacetylation degree of more than or equal to 98% and viscosity of 650mPa & S in 100kg of acetic acid aqueous solution with mass fraction of 0.7%, adding 0.15kg of dodecyl trimethyl ammonium chloride, uniformly stirring, adding 50kg of prefabricated material a, stirring for 3h at the stirring temperature of 85 ℃, and obtaining prefabricated material b;
s3, adding 4.5kg of acrylamide into 55kg of the prefabricated material b, uniformly stirring, continuously adding 0.015kg of N, N' -methylene bisacrylamide and 0.15kg of potassium persulfate under the stirring state, and stirring for 10min at the stirring temperature of 80 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a tubular electric furnace, introducing nitrogen for protection, heating to 190 ℃ at the speed of 7 ℃/min, preserving heat for 15min, continuing heating to 270 ℃ at the speed of 13 ℃/min, preserving heat for 7min, air-cooling to room temperature, and crushing to obtain the soil passivator for landscaping.
Performing a chromium adsorption test on the soil passivator for landscaping obtained in the example 5 and the comparative examples 1 to 5, adding a chromium chloride solution into a soil sample until the chromium concentration in the soil sample reaches 800mg/kg, and then averagely dividing the soil sample into 6 groups, wherein each group is repeated for 3 times; respectively adding the soil passivator for landscaping obtained in the embodiment 5 or the comparative examples 1-5 into each repetition, and uniformly mixing, wherein the addition amount is 2.0%; and preparing the leachate at the 7 th and 14 th days after mixing according to the procedure of an acetic acid buffer solution method of the solid waste leaching toxicity leaching method of HJ/T300-. The results are as follows:
| when the soil is maintained for 7 days, the concentration of chromium in the soil is mg/kg | The chromium concentration of the soil is mg/kg when the soil is maintained for 14 days | |
| Example 5 | 206.5 | 107.6 |
| Comparative example 1 | 521.3 | 492.5 |
| Comparative example 2 | 266.9 | 124.0 |
| Comparative example 3 | 405.3 | 259.7 |
| Comparative example 4 | 372.4 | 204.2 |
| Comparative example 5 | 301.5 | 192.3 |
From the above table, it can be seen that: the soil passivator for landscaping, which is obtained by the invention, is used for maintenance for 7 days, the chromium content in the soil is rapidly reduced, and after the soil is maintained for 14 days, the requirement that the total chromium limit value of the vegetable field in GB 15618-.
Performing a soil improvement test on a farm in a certain place, and randomly dividing the land parcels into 7 groups, wherein each group comprises 3 repeats; the soil passivator for landscaping obtained in example 5 and comparative examples 1-5 was uniformly applied on the soil surface at a dosage of 20 kg/mu, rotary tillage was performed for 3 times, and the soil was analyzed after 3 months:
the soil aggregate content was as follows:
the volume weight, porosity and organic matter content of the soil are as follows:
| volume weight of soil, g/cm3 | Porosity, is% | Organic matter content, g/kg | |
| Example 5 | 1.30 | 49.8 | 35.13 |
| Comparative example 1 | 1.43 | 47.0 | 28.35 |
| Comparative example 2 | 1.32 | 49.5 | 33.87 |
| Comparative example 3 | 1.39 | 47.4 | 29.93 |
| Comparative example 4 | 1.35 | 48.8 | 32.15 |
| Comparative example 5 | 1.36 | 48.2 | 31.26 |
| Blank control | 1.47 | 45.7 | 24.34 |
The above results confirm that: the soil passivator for landscaping, which is obtained by the invention, has a honeycomb structure, high pore-forming rate, uniform and fine structure, large specific surface area, high mechanical strength and high pressure resistance, is beneficial to the adsorption of heavy metal elemental chromium on one hand, has extremely high stability on the other hand, and can play a role in improving soil and preventing soil from hardening when being applied to soil.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A preparation method of a soil passivator for landscaping is characterized by comprising the following steps:
s1, mixing montmorillonite and bamboo charcoal powder, drying, grinding and sieving, adding into nitric acid solution, stirring at 80-90 ℃ for 20-40min, performing ultrasonic treatment during stirring, filtering, washing with water to be neutral, drying at 70-80 ℃ to constant weight, performing ultrasonic treatment during drying, crushing and sieving to obtain a prefabricated material a;
s2, dissolving chitosan in an acetic acid aqueous solution, adding dodecyl trimethyl ammonium chloride, uniformly stirring, adding the prefabricated material a, and stirring for 2-4 hours at the stirring temperature of 80-90 ℃ to obtain a prefabricated material b;
s3, adding acrylamide into the prefabricated material b, uniformly stirring, continuously adding the cross-linking agent and the initiator under the stirring state, and stirring for 5-15min at the stirring temperature of 75-85 ℃ to obtain a prefabricated material c;
s4, placing the prefabricated material c into a microwave tube electric furnace, introducing nitrogen for protection, firstly heating to 180-.
2. The preparation method of the soil passivator for landscaping, according to claim 1, wherein in S1, the mass ratio of montmorillonite to bamboo charcoal powder is 30-50: 5-15.
3. The preparation method of the soil passivator for landscaping, according to claim 1, wherein in S1, the concentration of the nitric acid solution is 2.5-3.5mol/L, and the solid-to-liquid ratio is 1: 2.5-3.2.
4. The preparation method of the soil passivator for landscaping, according to claim 1, wherein in S2, the mass fraction of the acetic acid aqueous solution is 0.4-1%, and the mass ratio of the chitosan to the acetic acid aqueous solution is 4-8: 100.
5. the preparation method of the soil passivator for landscaping, according to claim 1, wherein in S2, the mass ratio of chitosan, dodecyl trimethyl ammonium chloride and the prefabricated material a is 4-8: 0.1-0.2: 40-60.
6. The preparation method of the soil passivator for landscaping, according to claim 1, wherein in S3, the mass ratio of the prefabricated material b, the acrylamide, the cross-linking agent and the initiator is 45-65: 3-6: 0.01-0.02: 0.1-0.2.
7. The method for preparing a soil passivator for landscaping as defined in claim 1, wherein in S4, the temperature is raised to 180-200 ℃ at a rate of 4-10 ℃/min.
8. The method for preparing a soil passivator for landscaping as defined in claim 1, wherein in S4, the temperature is raised to 240-300 ℃ at a speed of 12-14 ℃/min.
9. A soil passivator for landscaping, which is prepared by the method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901762.4A CN111961476B (en) | 2020-09-01 | 2020-09-01 | Soil passivator for landscaping and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901762.4A CN111961476B (en) | 2020-09-01 | 2020-09-01 | Soil passivator for landscaping and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111961476A CN111961476A (en) | 2020-11-20 |
| CN111961476B true CN111961476B (en) | 2022-01-14 |
Family
ID=73401195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010901762.4A Active CN111961476B (en) | 2020-09-01 | 2020-09-01 | Soil passivator for landscaping and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111961476B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113349114A (en) * | 2021-07-15 | 2021-09-07 | 安徽冠禅生物科技有限公司 | Fresh water weever breeding method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104560049A (en) * | 2015-02-09 | 2015-04-29 | 湖南神隆超级稻丰产工程有限公司 | Soil heavy metal repairing agent |
| CN106479511A (en) * | 2016-09-26 | 2017-03-08 | 上海理工大学 | A kind of spacetabs type water-loss reducer that can be used for heavy metal pollution of soil reparation and preparation method |
| CN106748307A (en) * | 2017-02-21 | 2017-05-31 | 安徽帝元现代农业投资发展有限公司 | A kind of biodegradable biomass carbon based slow-release fertilizer and preparation method thereof |
| CN107381755A (en) * | 2017-09-22 | 2017-11-24 | 苏州水木康桥环境工程技术有限公司 | A kind of environment-friendly long-life heavy metal industrial effluent inorganic agent and preparation method thereof |
| CN107573659A (en) * | 2017-09-07 | 2018-01-12 | 芜湖林电子科技有限公司 | A kind of high slow release fertilizer coating 3D printing material of agricultural |
| CN108440171A (en) * | 2018-06-25 | 2018-08-24 | 合肥慧明瀚生态农业科技有限公司 | A kind of dryness soil compound water retaining agent and preparation method thereof |
| CN109439340A (en) * | 2018-10-18 | 2019-03-08 | 北京市园林绿化集团有限公司 | A kind of afforestation soil water-retaining agent and its preparation method and application |
-
2020
- 2020-09-01 CN CN202010901762.4A patent/CN111961476B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104560049A (en) * | 2015-02-09 | 2015-04-29 | 湖南神隆超级稻丰产工程有限公司 | Soil heavy metal repairing agent |
| CN106479511A (en) * | 2016-09-26 | 2017-03-08 | 上海理工大学 | A kind of spacetabs type water-loss reducer that can be used for heavy metal pollution of soil reparation and preparation method |
| CN106748307A (en) * | 2017-02-21 | 2017-05-31 | 安徽帝元现代农业投资发展有限公司 | A kind of biodegradable biomass carbon based slow-release fertilizer and preparation method thereof |
| CN107573659A (en) * | 2017-09-07 | 2018-01-12 | 芜湖林电子科技有限公司 | A kind of high slow release fertilizer coating 3D printing material of agricultural |
| CN107381755A (en) * | 2017-09-22 | 2017-11-24 | 苏州水木康桥环境工程技术有限公司 | A kind of environment-friendly long-life heavy metal industrial effluent inorganic agent and preparation method thereof |
| CN108440171A (en) * | 2018-06-25 | 2018-08-24 | 合肥慧明瀚生态农业科技有限公司 | A kind of dryness soil compound water retaining agent and preparation method thereof |
| CN109439340A (en) * | 2018-10-18 | 2019-03-08 | 北京市园林绿化集团有限公司 | A kind of afforestation soil water-retaining agent and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111961476A (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111961476B (en) | Soil passivator for landscaping and preparation method thereof | |
| CN112156752B (en) | Modified activated carbon with reproducible adsorbability and application thereof in wastewater treatment | |
| CN111100652A (en) | Heavy metal contaminated soil remediation agent and preparation method and application method thereof | |
| CN104945117A (en) | Soil activator | |
| CN106824069A (en) | Preparation method for processing the rear-earth-doped iron Carbon Materials of arsenic-containing waste water | |
| CN109575934B (en) | Heavy metal contaminated soil remediation agent and preparation method and application thereof | |
| CN107057712B (en) | Curing agent suitable for strong-acid compound heavy metal polluted soil and production and use methods thereof | |
| CN112792118B (en) | Method for preparing active filler by using hydroxyapatite, zero-valent iron and humic acid and application thereof | |
| CN100415360C (en) | Production of sewage dephosphor adsorbent by adsorptive ion rare earth | |
| CN112280563B (en) | Phosphate solubilizing bacteria mineralization conditioner, preparation method thereof and heavy metal contaminated soil remediation and improvement method | |
| CN111646659B (en) | Heavy metal polluted bottom mud curing agent and curing method thereof | |
| CN106915822B (en) | Composite magnetic particle based on alnico | |
| CN112080281B (en) | Soil conditioner for landscaping and preparation method thereof | |
| CN109679863B (en) | Microbial remediation reagent for petroleum-polluted soil and preparation method thereof | |
| CN114702961B (en) | Amorphous ferro-manganese colloidal material and preparation method and application thereof | |
| CN105586331A (en) | Method of denitrified composite microbial inoculant | |
| CN114570758A (en) | Method for repairing hexavalent chromium contaminated soil and repairing agent | |
| CN113717731A (en) | Efficient restoration agent for lead-cadmium combined polluted soil and preparation method thereof | |
| CN112480931A (en) | Passivating agent for treating cadmium and arsenic combined pollution of paddy field and preparation method and application thereof | |
| CN111570491A (en) | Preparation method of modified red mud composite polymer gel Cr (VI) removing filler | |
| CN106581928B (en) | Method for amphoteric activation detoxification of chromium residue | |
| CN114226441B (en) | Method for solidifying heavy metal polluted soil and preventing secondary pollution by polyvinyl alcohol | |
| CN113023820A (en) | Low-cost and efficient municipal sewage treatment method | |
| CN108640790A (en) | A kind of porous mineral soil-repairing agent containing alginic acid | |
| CN116536056B (en) | Soil pollution repairing agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20211214 Address after: 237000 room 109, building G8, Shangcheng international community, 197 Foziling Middle Road, Lu'an City, Anhui Province Applicant after: Anhui Shanhu Ecological Construction Co.,Ltd. Address before: 237000 Street education system of Shipodian Town, Yu'an District, Lu'an City, Anhui Province Applicant before: Zhang Shujun |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |