Microplastic adsorbent based on organic material and soil carbon sequestration method

Abstract

The invention provides a microplastic adsorbent based on organic materials and a soil carbon sequestration method. According to the micro-plastic adsorbent based on the organic material and the soil carbon sequestration method, the micro-plastic adsorbent comprises 25-40% of a modified biomass-based material, 8-15% of an environment-friendly cross-linking agent, 5-12% of nanoscale metal oxide particles, 15-30% of a porous carbon material, 1-5% of a stabilizer, 2-6% of a biological enzyme compound, 3-8% of magnetic nanoparticles, 1-3% of an antioxidant and 2-5% of a reinforcing agent. According to the micro-plastic adsorbent based on the organic material and the soil carbon sequestration method, multifunctional components such as the modified organic material, the nanoscale metal oxide, the porous carbon material, the bio-enzyme compound and the magnetic nanoparticles are used, so that the problems that a traditional organic material adsorbent is relatively low in durability and poor in adsorption selectivity are solved; the modified biomass-based material is subjected to alkaline treatment and pyrolysis, so that the mechanical strength and the durability are enhanced, and the efficient adsorption performance of the adsorbent in long-term use is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of microplastic adsorbents, and in particular to a microplastic adsorbent based on organic materials and a soil carbon sequestration method. Background Art

[0002] Microplastic adsorbents and soil carbon sequestration methods based on organic materials aim to prepare adsorbents that can adsorb microplastic particles by using organic materials (such as biomass, polymers, etc.), and combine them with soil carbon sequestration technology. Such adsorbents usually have good adsorption properties and a large surface area, which can effectively capture and fix microplastic particles, thereby reducing their pollution to the environment. In the soil, adsorbents can not only adsorb microplastics, but also enhance the soil's carbon sequestration capacity by stabilizing carbon sources, helping to mitigate the impact of climate change.

[0003] The system also faces some drawbacks in practical applications. Organic materials have low durability and may degrade over long-term use, affecting adsorption performance. There are many types of microplastics, and different adsorbents may show selectivity when dealing with diverse microplastics, resulting in reduced efficiency. Summary of the invention

[0004] In response to the shortcomings of the prior art, the present invention provides a microplastic adsorbent and soil carbon sequestration method based on organic materials, which solves the problem that organic materials have low durability and may be degraded after long-term use, affecting adsorption performance; different adsorbents may show selectivity when dealing with diverse microplastics, resulting in reduced efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a microplastic adsorbent based on organic materials and a soil carbon sequestration method, comprising:

[0006] Modified biomass-based materials: 25-40%, environmentally friendly cross-linking agent: 8-15%, nano-scale metal oxide particles: 5-12%, porous carbon material: 15-30%, stabilizer: 1-5%, bio-enzyme complex: 2-6%, magnetic nanoparticles: 3-8%, antioxidant: 1-3%, enhancer: 2-5%.

[0007] Preferably, the modified biomass-based material is selected from corn stalks, bamboo fibers, wood chips or rice husks, and is modified by alkaline treatment and pyrolysis processes to enhance its mechanical strength and durability. The environmentally friendly cross-linking agent is chitosan, gelatin or polylactic acid, which forms a stable adsorption structure with the porous carbon material through a cross-linking reaction.

[0008] Preferably, the nanoscale metal oxide particles are iron oxide, zinc oxide or titanium dioxide, which can provide active sites on the adsorption surface and enhance the adsorption performance of various microplastics. The porous carbon material is activated carbon prepared from coconut shells and apricot shells, which has a high specific surface area and good adsorption capacity.

[0009] Preferably, the biological enzyme complex includes protease and lipase, which can decompose organic matter attached to the surface of microplastics, thereby improving the overall adsorption capacity of the adsorbent; the magnetic nanoparticles are or CoFe2O4; and the antioxidant is vitamin E or pomegranate peel extract, which can delay the degradation of the adsorbent in the environment.

[0010] Preferably, the enhancer is graphene or carbon nanotubes, which further improves the structural stability and adsorption capacity of the adsorbent. The modification process of the modified biomass-based material includes soaking, pyrolysis and cross-linking steps to enhance its heat resistance and resistance to chemical degradation. The bio-enzyme complex is loaded on the surface of the adsorbent through coating technology to degrade organic pollutants while capturing microplastic particles.

[0011] Microplastic adsorbent soil carbon sequestration methods based on organic materials include:

[0012] a. Preparation of modified organic materials, soaking the biomass materials in an alkaline solution to separate cellulose, hemicellulose and lignin, enhancing the reactivity of the materials, and pyrolyzing the treated biomass materials to enhance their mechanical strength and durability to prevent degradation during long-term use;

[0013] b. Prepare the adsorbent in proportion to ensure high efficiency and broad spectrum adsorption capacity;

[0014] c. Using ultrasonic dispersion, hot pressing or solution cross-linking process, the modified organic material is mixed with other components to form an adsorbent with a porous structure and active sites to ensure its efficient adsorption performance;

[0015] d. Apply the prepared adsorbent to the soil. The adsorbent captures microplastic particles through physical adsorption and chemical adsorption. The nano-metal oxide particles provide active sites, the porous carbon material increases the specific surface area, and the bio-enzyme complex decomposes the organic matter attached to the surface of the microplastics, further improving the adsorption efficiency.

[0016] e. During the microplastic adsorption process, the carbon components in the adsorbent combine with the organic carbon in the soil to form a stable carbon sequestration system, reduce carbon release, enhance soil carbon storage capacity, and improve soil health;

[0017] f. After the adsorbent has been used for a period of time, it is recovered by magnetic separation technology using magnetic nanoparticles. After recovery, microplastics are removed by heating or solvent washing. The adsorbent can be regenerated and continued to be used to maintain its adsorption performance;

[0018] g. In order to extend the service life of the adsorbent and reduce the environmental impact, antioxidants are added to the adsorbent to prevent its premature degradation in the soil, and enhancers improve the mechanical strength of the adsorbent, allowing it to operate stably in complex environments.

[0019] Preferably, the modified organic material is corn stalks, bamboo fibers, wood chips or rice husks, which are treated with an alkaline solution and then pyrolyzed to enhance their mechanical strength and durability.

[0020] Preferably, the bio-enzyme complex includes protease and lipase, which are used to decompose organic matter on the surface of microplastics and improve the microplastic removal efficiency of the adsorbent.

[0021] The present invention provides a microplastic adsorbent based on organic materials and a soil carbon sequestration method. It has the following beneficial effects:

[0022] This organic material-based microplastic adsorbent and soil carbon sequestration method solves the problems of low durability and poor adsorption selectivity of traditional organic material adsorbents by using multifunctional components such as modified organic materials, nano-scale metal oxides, porous carbon materials, bio-enzyme complexes and magnetic nanoparticles. The modified biomass-based materials enhance mechanical strength and durability through alkaline treatment and pyrolysis, ensuring that the adsorbent can maintain efficient adsorption performance during long-term use. Nano-metal oxides provide a wide range of active sites that can effectively adsorb different types of microplastic particles, while porous carbon materials further enhance adsorption capacity through high specific surface area. The bio-enzyme complex improves the overall adsorption efficiency by decomposing organic matter attached to the surface of microplastics. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the internal structure of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1As shown, the embodiment of the present invention provides a microplastic adsorbent based on organic materials and a soil carbon sequestration method, including: modified biomass-based materials: 25-40%, environmentally friendly cross-linking agents: 8-15%, nano-scale metal oxide particles: 5-12%, porous carbon materials: 15-30%, stabilizers: 1-5%, bio-enzyme complexes: 2-6%, magnetic nanoparticles: 3-8%, antioxidants: 1-3%, enhancers: 2-5%, the modified biomass-based materials are selected from corn stalks, bamboo fibers, wood chips or rice husks, and are modified by alkaline treatment and pyrolysis processes to enhance their mechanical strength and durability, the environmentally friendly cross-linking agent is chitosan, gelatin or polylactic acid, which forms a stable adsorption structure with the porous carbon material through a cross-linking reaction, and the nano-scale metal oxide particles are iron oxide, zinc oxide or titanium dioxide, which can be on the adsorption surface The surface provides active sites to enhance the adsorption performance of various microplastics. The porous carbon material is activated carbon prepared from coconut shells and apricot shells, which has a high specific surface area and good adsorption capacity. The bio-enzyme complex includes proteases and lipases, which can decompose organic matter attached to the surface of microplastics, thereby improving the overall adsorption capacity of the adsorbent. The magnetic nanoparticles are Fe3O4 or CoFe2O4. The antioxidant is vitamin E or pomegranate peel extract, which can delay the degradation of the adsorbent in the environment. The enhancer is graphene or carbon nanotubes, which further improves the structural stability and adsorption capacity of the adsorbent. The modification process of the modified biomass-based material includes soaking, pyrolysis and cross-linking steps to enhance its heat resistance and resistance to chemical degradation. The bio-enzyme complex is loaded on the surface of the adsorbent through coating technology, which degrades organic pollutants while capturing microplastic particles.

[0026] A soil carbon sequestration method for microplastic adsorbents based on organic materials, a. Preparation of modified organic materials, soaking biomass materials in an alkaline solution to separate cellulose, hemicellulose and lignin, and enhance the reactivity of the materials, pyrolyzing the treated biomass materials to enhance their mechanical strength and durability to prevent degradation in long-term use, and further modification of the modified biomass-based materials includes a cross-linking reaction in a temperature range of 60-90°C, and a reaction time of 2-4 hours. Through the cross-linking reaction, an environmentally friendly cross-linking agent is combined with the structure of the modified material to form a highly stable adsorption network structure, further improving the durability and mechanical strength of the material, and ensuring its stability and anti-degradation ability in long-term use, the modified organic material is corn stalks, bamboo fibers, sawdust or rice husks, and is pyrolyzed after being treated with an alkaline solution to enhance its mechanical strength and durability, and the bioenzyme complex includes proteases and lipases, which are used to decompose organic matter on the surface of microplastics and improve the microplastic removal efficiency of the adsorbent.

[0027] b. Prepare the adsorbent in proportion to ensure high efficiency and broad spectrum adsorption capacity.

[0028] c. Use ultrasonic dispersion, hot pressing or solution cross-linking technology to mix the modified organic material with other components to form an adsorbent with a porous structure and active sites. In order to ensure the efficient adsorption performance of the adsorbent, the pore size of the porous carbon material is adjusted and controlled between 2-50 nanometers to give it a multi-scale micropore and mesopore structure. By optimizing the pore size distribution, the specific surface area of ​​the adsorbent is maximized and its ability to capture microplastics is enhanced. The porous carbon material is treated with ultrasonic technology to ensure a uniform distribution of the pore structure, further improving the adsorption efficiency and ensuring its efficient adsorption performance.

[0029] d. Apply the prepared adsorbent to the soil. The adsorbent captures microplastic particles through physical adsorption and chemical adsorption. Nano-metal oxide particles provide active sites, porous carbon materials increase the specific surface area, and biological enzyme complexes decompose organic matter attached to the surface of microplastics, further improving the adsorption efficiency.

[0030] e. During the microplastic adsorption process, the carbon components in the adsorbent combine with the organic carbon in the soil to form a stable carbon sequestration system, reduce carbon release, enhance soil carbon storage capacity, and improve soil health.

[0031] f. After the adsorbent has been used for a period of time, it is recovered through magnetic separation technology using magnetic nanoparticles. After recovery, microplastics are removed by heating or solvent washing. The adsorbent can be regenerated and continued to be used to maintain its adsorption performance. In order to optimize the use of energy during the regeneration of the adsorbent, an energy recovery system is used in the recycling process to recycle the heat energy generated during the heating process to maintain the heat demand during solvent washing or heat treatment. By optimizing the amount of washing solvent used and the number of cycles, the energy consumption and solvent waste in the regeneration process can be reduced, thereby reducing the negative impact on the environment and improving the sustainability of the process.

[0032] g. In order to extend the service life of the adsorbent and reduce the environmental impact, antioxidants are added to the adsorbent to prevent its premature degradation in the soil, and enhancers improve the mechanical strength of the adsorbent, allowing it to operate stably in complex environments.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for soil carbon sequestration using microplastic adsorbents based on organic materials, characterized in that: include: Modified biomass-based materials: 25-40%, environmentally friendly cross-linking agent: 8-15%, nano-scale metal oxide particles: 5-12%, porous carbon material: 15-30%, stabilizer: 1-5%, bio-enzyme complex: 2-6%, magnetic nanoparticles: 3-8%, antioxidant: 1-3%, enhancer: 2-5%.

2. The microplastic adsorbent based on organic materials according to claim 1, characterized in that: The modified biomass-based material is selected from corn stalks, bamboo fibers, wood chips or rice husks, and the environmentally friendly cross-linking agent is chitosan, gelatin or polylactic acid.

3. The microplastic adsorbent based on organic materials according to claim 1, characterized in that: The nano-scale metal oxide particles are iron oxide, zinc oxide or titanium dioxide, which can provide active sites on the adsorption surface. The porous carbon material is activated carbon prepared from coconut shells and apricot shells.

4. The microplastic adsorbent based on organic materials according to claim 1, characterized in that: The biological enzyme complex comprises protease and lipase, the magnetic nanoparticles are Fe3O4 or CoFe2O4, and the antioxidant is vitamin E or pomegranate peel extract.

5. The microplastic adsorbent based on organic materials according to claim 1, characterized in that: The reinforcing agent is graphene or carbon nanotubes, the modification process of the modified biomass-based material includes soaking, pyrolysis and cross-linking steps, and the biological enzyme complex is loaded on the surface of the adsorbent through a coating technology.

6. A method for soil carbon sequestration using microplastic adsorbents based on organic materials, characterized in that: a. Preparation of modified organic materials, soaking the biomass materials in an alkaline solution to separate cellulose, hemicellulose and lignin, enhancing the reactivity of the materials, and pyrolyzing the treated biomass materials to enhance their mechanical strength and durability to prevent degradation during long-term use; b. Prepare the adsorbent in proportion to ensure high efficiency and broad spectrum adsorption capacity; c. Using ultrasonic dispersion, hot pressing or solution cross-linking process, the modified organic material is mixed with other components to form an adsorbent with a porous structure and active sites to ensure its efficient adsorption performance; d. Apply the prepared adsorbent to the soil. The adsorbent captures microplastic particles through physical adsorption and chemical adsorption. The nano-metal oxide particles provide active sites, the porous carbon material increases the specific surface area, and the bio-enzyme complex decomposes the organic matter attached to the surface of the microplastics, further improving the adsorption efficiency. e. During the microplastic adsorption process, the carbon components in the adsorbent combine with the organic carbon in the soil to form a stable carbon sequestration system, reduce carbon release, enhance soil carbon storage capacity, and improve soil health; f. After the adsorbent has been used for a period of time, it is recovered by magnetic separation technology using magnetic nanoparticles. After recovery, microplastics are removed by heating or solvent washing. The adsorbent can be regenerated and continued to be used to maintain its adsorption performance; g. In order to extend the service life of the adsorbent and reduce the environmental impact, antioxidants are added to the adsorbent to prevent its premature degradation in the soil, and enhancers improve the mechanical strength of the adsorbent, allowing it to operate stably in complex environments.

7. The method for soil carbon sequestration using microplastic adsorbents based on organic materials according to claim 6, characterized in that: The modified organic material is corn stalks, bamboo fibers, wood chips or rice husks, which are treated with an alkaline solution and then pyrolyzed to enhance their mechanical strength and durability.

8. The method for soil carbon sequestration using microplastic adsorbents based on organic materials according to claim 6, characterized in that: The bio-enzyme complex includes protease and lipase, which are used to decompose organic matter on the surface of microplastics and improve the microplastic removal efficiency of the adsorbent.

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