Herbal medicine residue isolation bag for removing heavy metals and preparation method thereof
By combining modified acrylic fiber with lithium-based chelating agents, the herbal residue separation bag for removing heavy metals has solved the problems of heavy metal pollution and loss of effective ingredients during the decoction of traditional Chinese medicine at home, achieving the effect of efficient purification and preservation of medicinal efficacy.
Patent Information
- Application Number
- CN202511145260.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2025-11-28
AI Technical Summary
During the decoction process of traditional Chinese medicine at home, there are problems with heavy metal pollution and loss of effective ingredients. Existing filter bags cannot effectively remove heavy metal ions and pesticide residues, and distillation methods cannot completely solve the problem of heavy metal pollution, resulting in reduced efficacy.
Modified acrylic fibers are combined with lithium-based chelating agents to create a herbal residue-filtering bag for removing heavy metals using modified acrylic nonwoven fabric. The hydrophilicity of the modified fibers and the chelating effect of the chelating agent adsorb and intercept heavy metal ions and pesticides during the distillation process. Combined with the inclusion function of β-cyclodextrin, the herbal solution is purified in a synergistic manner.
It achieves efficient removal of heavy metals and pesticides during the preparation of traditional Chinese medicine at home, while retaining the effective components of the herbs, improving the safety and efficacy of the medicinal liquid, and providing a convenient one-stop purification solution.
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Figure BDA0005550817720000131
Abstract
Description
Technical Field
[0001] This invention relates to the field of nonwoven bag technology, specifically to a herbal residue separator bag for removing heavy metals and its preparation method. Background Technology
[0002] Traditional Chinese medicine is a treasure of the Chinese nation, and home decoction is its most widespread application. However, with industrialization and increasingly severe environmental pollution, Chinese medicinal herbs inevitably become contaminated with heavy metals such as lead (Pb), cadmium (Cd), mercury (Hg), and arsenic (As) during planting, harvesting, transportation, and storage. In the traditional home decoction method, these harmful heavy metal ions dissolve and leach out, and are ingested along with the decoction. Long-term accumulation can cause serious damage to the liver, kidneys, and nervous system, posing a significant threat to medication safety.
[0003] Meanwhile, traditional high-temperature, long-duration decoction methods have another significant drawback: many heat-sensitive or volatile active ingredients (such as volatile oils, aromatic substances, and some alkaloids) will decompose due to excessive heating or be lost with steam, thus reducing their efficacy. In addition, pesticide residues may adhere to the surface of some medicinal materials, which can also enter the decoction during the decoction process, posing additional health risks.
[0004] To address the loss of active ingredients, some users have begun using home-use distillation extraction equipment (such as hydrosol extractors) to prepare traditional Chinese medicine decoctions in recent years. This method, through low-temperature distillation, can better preserve volatile active ingredients. However, existing technologies still have limitations: simple distillation cannot effectively remove heavy metals. Although heavy metals themselves have extremely high boiling points and will not evaporate, during vigorous boiling, tiny water droplets carrying heavy metal ions can be carried into the condensation and collection system along with the water vapor through the "fog entrainment" effect. This results in the final decoction still containing heavy metals, and the safety hazard remains.
[0005] Currently available filter bags on the market, whether made of cotton, non-woven fabric, or nylon, are limited to filtering medicinal residues and are considered physical barriers. They are completely ineffective against harmful pollutants such as heavy metals and pesticides that have already dissolved or exist in ionic form.
[0006] Therefore, there is an urgent need in this field for a new technical solution that can easily and efficiently remove heavy metal ions and pesticide residues during decoction or distillation in a home environment, while retaining the effective components of medicinal materials to the maximum extent, thereby fundamentally improving the safety and effectiveness of home-prepared traditional Chinese medicine. Summary of the Invention
[0007] To address the shortcomings of existing technologies, the present invention aims to provide a herbal filter bag for removing heavy metals and its preparation method. Addressing the pain points of heavy metal and pesticide residue contamination and easy loss of active ingredients during home decoction of traditional Chinese medicine, this invention offers an innovative solution integrating filtration and purification. The filter bag can efficiently remove harmful substances, greatly improving the safety of the medicinal solution; it is also compatible with modern distillation methods to retain volatile components and enhance efficacy.
[0008] To achieve the above objectives, the present invention adopts the following technical solution:
[0009] A method for preparing a herbal residue-removing bag for removing heavy metals includes the following steps: opening, carding, and cross-laying modified acrylic fibers, followed by hydroentangling to obtain modified acrylic nonwoven fabric; immersing the modified acrylic nonwoven fabric in an aqueous solution of lithium-based chelating agent; placing it in a water bath shaker after immersion; washing it with water; air-drying it naturally; and then slitting, cutting, shaping, and attaching handles to obtain the herbal residue-removing bag for removing heavy metals.
[0010] Preferably, the lithium-based chelating agent is Li2C. 10 H 16 N2O8.
[0011] Preferably, the concentration of the lithium-based chelating agent aqueous solution is 30-50 mg / L, the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 30-50 mL, the water bath temperature in the water bath shaker is 60-70℃, and the shaking time is 2-3 h.
[0012] Preferably, the modified acrylic fiber is prepared by the following method steps:
[0013] (1) The acrylic fiber was washed and dried with acetone and deionized water, and then immersed in a polyethyleneimine aqueous solution. The reaction was carried out under ultraviolet irradiation in a nitrogen atmosphere. The product was taken out, washed and dried to obtain aminated fiber.
[0014] Amination reaction: Under ultraviolet light irradiation, the cyano groups (-C≡N) on the acrylic fiber molecular chain absorb energy and are excited, transforming into a highly active excited state. At this time, the primary amino groups (-NH₃) with lone pairs of electrons on the polyethyleneimine (PEI) molecular chain in the solution act as nucleophiles, attacking the excited cyano carbon atoms with reduced electron cloud density. This causes the triple bond of the cyano group to open, forming a carbon-nitrogen double bond. Ultimately, a stable ammonium-amine bond is formed between the fiber and PEI, thus successfully "grafting" the long PEI chain containing a large number of amino groups onto the surface of the acrylic fiber.
[0015] Preferably, in step (1), the ratio of acrylic fiber to polyethyleneimine aqueous solution is 10g:400-600mL; the concentration of polyethyleneimine is 2-10wt%.
[0016] Preferably, in step (1), the reaction conditions are ultraviolet irradiation at 25-40°C for 2-8 hours, the main wavelength of ultraviolet light is 250-400nm, and the reaction is stirred slowly.
[0017] (2) The amino-modified fiber was dispersed in THF, and chloroacetyl chloride and triethylamine were slowly added under nitrogen atmosphere and ice bath. The reaction was carried out at room temperature. The product was filtered, washed and dried to obtain intermediate fiber.
[0018] Preparation of intermediate fibers: The surface of aminated fibers has a large number of primary and secondary amino groups (-NH₃, -NH₄⁻), which are strong nucleophilic sites. When chloroacetyl chloride (Cl-CH-CO-Cl) is added, the nitrogen atom of the amino group preferentially attacks the highly reactive acyl chloride carbon atom on the chloroacetyl chloride. Under the action of triethylamine, the byproduct hydrogen chloride generated in the reaction is rapidly neutralized, ultimately forming an amide bond. At the same time, the reactive chloroalkyl group (-CH-Cl) is successfully attached to the fiber surface, constituting the intermediate.
[0019] Preferably, in step (2), the ratio of amino-modified cellulose, THF, chloroacetyl chloride, and triethylamine is 10g: 200-400mL: 3-8mL: 5-12mL.
[0020] Preferably, in step (2), the ice bath is at 0-5°C; the reaction is then brought to room temperature for 2-5 hours.
[0021] (3) Add β-cyclodextrin and anhydrous sodium carbonate to DMSO, then add intermediate fiber, sonicate, stir and react under nitrogen atmosphere, filter, wash and dry the product to obtain modified acrylic fiber.
[0022] Cyclodextrin grafting: First, anhydrous sodium carbonate, acting as a base, removes a proton (H+) from the hydroxyl group (-OH) at the outer edge of the β-cyclodextrin molecule, transforming it into a more reactive and nucleophilic alkoxide (-O-). This alkoxide then attacks the chloroalkyl carbon atom (-CH-Cl) at the end of the "reactive arm" on the intermediate fiber. The chlorine atom departs as a chloride ion, ultimately forming a strong ether bond (-O-CH-) between the fiber and the cyclodextrin, thus successfully immobilizing the inclusion-encapsulating cyclodextrin molecule onto the fiber material.
[0023] Preferably, in step (3), the ratio of β-cyclodextrin, anhydrous sodium carbonate, DMSO, and intermediate fiber is 30-60g: 8-15g: 400-600mL: 10g.
[0024] Preferably, in step (3), the ultrasonic treatment is performed for 10 to 30 minutes; the stirring reaction conditions are 60 to 90°C for 12 to 24 hours.
[0025] The present invention also claims protection for a herbal residue-removing bag for removing heavy metals prepared by the preparation method described above.
[0026] Compared with the prior art, the present invention has the following beneficial effects:
[0027] 1. This invention provides a herbal residue-filtering bag for removing heavy metals, achieving safety, efficiency, and convenience in the home preparation of traditional Chinese medicine. Firstly, this product, through the combined action of modified fibers and lithium-based chelating agents, adsorbs and chelates toxic heavy metal ions such as lead, cadmium, and mercury in the medicinal liquid. Especially when adapted to household distillation equipment, its unique hydrophilic swelling properties enable it to efficiently adhere to and intercept tiny droplets carrying contaminants generated during distillation due to "mist entrainment," thus eliminating the risk of secondary heavy metal pollution at its source and ensuring users can safely extract and retain the valuable volatile active ingredients in the herbs. Furthermore, this product integrates complex purification functions into a simple and easy-to-use residue-filtering bag, providing a one-stop solution for herbal filling, heavy metal and pesticide residue removal, and residue filtration, significantly improving the convenience of home preparation of traditional Chinese medicine and the purity of the medicinal liquid.
[0028] 2. This invention provides a modified acrylic fiber. First, grafting is initiated by ultraviolet irradiation. This process not only roughens the fiber surface to increase the contact area with the medicinal liquid droplets, but more importantly, it grafts polyethyleneimine, introducing a high density of primary and secondary amino functional groups onto the fiber surface. The nitrogen atoms on these amino groups possess lone pairs of electrons, serving as excellent coordination sites and forming the main functional layer for adsorbing heavy metal ions. Furthermore, polyethyleneimine endows the fiber with superior hydrophilicity, causing it to swell upon contact with water vapor during the distillation of traditional Chinese medicine, thereby more efficiently intercepting heavy metals in the mist droplets. In addition, the numerous hydroxyl groups on the outer wall of the grafted β-cyclodextrin can act as auxiliary sites for synergistic adsorption of heavy metals, while its hydrophobic inner cavity can capture and encapsulate residual pesticides, off-flavors, and other small organic molecule pollutants in the medicinal liquid, producing a synergistic adsorption effect with polyethyleneimine. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.
[0030] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.
[0031] The lithium-based chelating agent is Li2C. 10 H 16 N2O8, purchased from Hong Kong Asia Pacific Group Limited;
[0032] Polyethyleneimine has a molecular weight of 1800–5000 Da;
[0033] β-Cyclodextrin was purchased from Hong Kong Asia Pacific Group Limited.
[0034] A method for preparing a herbal filter bag for removing heavy metals.
[0035] (1) Wash 10g of acrylic fiber with acetone and deionized water, dry it, and then immerse it in 400-600mL of 2-10wt% polyethyleneimine aqueous solution. React under ultraviolet irradiation at 25-40℃ in a nitrogen atmosphere for 2-8h. The main wavelength of ultraviolet light is 250-400nm. Take out the product, wash it, and dry it to obtain aminated fiber.
[0036] (2) Disperse 10g of aminated fiber in 200-400mL THF, slowly add 3-8mL of chloroacetyl chloride and 5-12mL of triethylamine under nitrogen atmosphere and ice bath 0-5℃, and react at room temperature for 2-5h. Filter, wash and dry the product to obtain intermediate fiber.
[0037] (3) Add 30-60g of β-cyclodextrin and 8-15g of anhydrous sodium carbonate to 400-600mL of DMSO, then add 10g of intermediate fiber, sonicate for 10-30min, stir and react at 60-90℃ in a nitrogen atmosphere for 12-24h, filter, wash and dry the product to obtain modified acrylic fiber.
[0038] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is immersed in a 30-50 mg / L lithium-based chelating agent aqueous solution (the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 30-50 mL). After immersion, it is placed in a water bath shaking pot at 60-70℃ and shaken for 2-3 hours. It is then taken out, washed with water, and air-dried naturally. After slitting, cutting, shaping and attaching handles, the heavy metal-removing herbal residue separator bag is obtained.
[0039] The present invention will be further described below through specific embodiments.
[0040] Example 1
[0041] A method for preparing a herbal filter bag for removing heavy metals.
[0042] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 10wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 40℃ under a nitrogen atmosphere for 2h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0043] (2) Disperse 10g of aminated fiber in 300mL THF, slowly add 8mL of chloroacetyl chloride and 12mL of triethylamine under nitrogen atmosphere and ice bath 2℃, and react at room temperature for 2h. Filter, wash and dry the product to obtain intermediate fiber.
[0044] (3) Add 60g of β-cyclodextrin and 15g of anhydrous sodium carbonate to 500mL of DMSO, then add 10g of intermediate fiber, sonicate for 20min, stir and react for 12h at 90℃ in a nitrogen atmosphere, filter, wash and dry the product to obtain modified acrylic fiber.
[0045] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, it is placed in a water bath shaking pot and shaken at 65°C for 2.5 h. After washing with water and air drying, it is slit, cut, shaped and attached with handles to obtain the heavy metal-removing herbal residue filter bag.
[0046] Example 2
[0047] A method for preparing a herbal filter bag for removing heavy metals.
[0048] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 6wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 35℃ under a nitrogen atmosphere for 4h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0049] (2) Disperse 10g of aminated fiber in 300mL THF, slowly add 6mL of chloroacetyl chloride and 10mL of triethylamine under nitrogen atmosphere and ice bath 2℃, and react at room temperature for 3h. Filter, wash and dry the product to obtain intermediate fiber.
[0050] (3) Add 50g of β-cyclodextrin and 12g of anhydrous sodium carbonate to 500mL of DMSO, then add 10g of intermediate fiber, sonicate for 20min, stir and react for 16h under nitrogen atmosphere at 80℃, filter, wash and dry the product to obtain modified acrylic fiber.
[0051] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, it is placed in a water bath shaking pot and shaken at 65°C for 2.5 h. After washing with water and air drying, it is slit, cut, shaped and attached with handles to obtain the heavy metal-removing herbal residue filter bag.
[0052] Example 3
[0053] A method for preparing a herbal filter bag for removing heavy metals.
[0054] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 4wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 30℃ under a nitrogen atmosphere for 6h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0055] (2) Disperse 10g of aminated fiber in 300mL THF, slowly add 5mL of chloroacetyl chloride and 8mL of triethylamine under nitrogen atmosphere and ice bath 2℃, and react at room temperature for 3h. Filter, wash and dry the product to obtain intermediate fiber.
[0056] (3) Add 40g β-cyclodextrin and 10g anhydrous sodium carbonate to 500mL DMSO, then add 10g intermediate fiber, sonicate for 20min, stir and react at 70℃ in a nitrogen atmosphere for 20h, filter, wash and dry the product to obtain modified acrylic fiber.
[0057] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, it is placed in a water bath shaking pot and shaken at 65°C for 2.5 h. After washing with water and air drying, it is slit, cut, shaped and attached with handles to obtain the heavy metal-removing herbal residue filter bag.
[0058] Example 4
[0059] A method for preparing a herbal filter bag for removing heavy metals.
[0060] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 2wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 25℃ under a nitrogen atmosphere for 8h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0061] (2) Disperse 10g of aminated fiber in 300mL THF, slowly add 3mL of chloroacetyl chloride and 5mL of triethylamine under nitrogen atmosphere and ice bath 2℃, and react at room temperature for 2h. Filter, wash and dry the product to obtain intermediate fiber.
[0062] (3) Add 30g β-cyclodextrin and 8g anhydrous sodium carbonate to 500mL DMSO, then add 10g intermediate fiber, sonicate for 20min, stir and react at 60℃ in a nitrogen atmosphere for 24h, filter, wash and dry the product to obtain modified acrylic fiber.
[0063] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, it is placed in a water bath shaking pot and shaken at 65°C for 2.5 h. After washing with water and air drying, it is slit, cut, shaped and attached with handles to obtain the heavy metal-removing herbal residue filter bag.
[0064] Comparative Example 1
[0065] A method for preparing a herbal filter bag for removing heavy metals.
[0066] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 10wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 40℃ under a nitrogen atmosphere for 2h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0067] (2) Disperse 10g of aminated fiber in 300mL THF, slowly add 8mL of chloroacetyl chloride and 12mL of triethylamine under nitrogen atmosphere and ice bath 2℃, and react at room temperature for 2h. Filter, wash and dry the product to obtain intermediate fiber.
[0068] (3) Add 60g of β-cyclodextrin and 15g of anhydrous sodium carbonate to 500mL of DMSO, then add 10g of intermediate fiber, sonicate for 20min, stir and react for 12h at 90℃ in a nitrogen atmosphere, filter, wash and dry the product to obtain modified acrylic fiber.
[0069] (4) After opening, combing and cross-laying the modified acrylic fiber, the modified acrylic nonwoven fabric is obtained by hydroentangling. After slitting, cutting, forming and installing handles, the heavy metal-removing herbal residue filter bag is obtained.
[0070] Comparative Example 2
[0071] A method for preparing a herbal filter bag for removing heavy metals.
[0072] (1) 10g of acrylic fiber was washed and dried with acetone and deionized water, and then immersed in 500mL of 10wt% polyethyleneimine aqueous solution. It was then irradiated with ultraviolet light at 40℃ under a nitrogen atmosphere for 2h. The main wavelength of the ultraviolet light was 254nm. The product was then removed, washed, and dried to obtain aminated fiber.
[0073] (2) Aminated acrylic fibers are opened, combed, and cross-laid, and then reinforced by hydroentangling to obtain aminated acrylic nonwoven fabric. The aminated acrylic nonwoven fabric is immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of aminated acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, it is placed in a water bath shaking pot and shaken at 65°C for 2.5 h. It is then taken out, washed with water, and air-dried naturally. After slitting, cutting, shaping, and attaching handles, the heavy metal-removing herbal residue separator bag is obtained.
[0074] Comparative Example 3
[0075] A method for preparing a herbal filter bag for removing heavy metals.
[0076] Modified acrylic nonwoven fabric is prepared by opening, carding, and cross-laying acrylic fibers, followed by hydroentangling reinforcement. The acrylic nonwoven fabric is then immersed in a 40 mg / L lithium-based chelating agent aqueous solution (the ratio of acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 40 mL). After immersion, the fabric is placed in a water bath shaker and shaken at 65°C for 2.5 h. The fabric is then removed, washed, and air-dried. After slitting, cutting, shaping, and attaching handles, the heavy metal-removing herbal residue separator bag is obtained.
[0077] Weigh out Pb(NO₃), Cd(NO₃)₄H₂O, HgCl₂, and As₂O₃ and dissolve them in deionized water to prepare a 50 mg / L standard solution. Cut the filter bags into 5 cm × 5 cm squares, preparing 5 pieces for each group. Sonicate the samples with deionized water for 10 minutes, and dry them at 105 °C to constant weight. Take 50 mL of the heavy metal standard solution into a 100 mL Erlenmeyer flask, add one sample piece from the filter bag, and shake in a constant temperature shaker at 25 °C (120 r / min) for 1 h. After the shake is complete, remove the filter bag, filter the solution through a 0.45 μm filter membrane, and dilute to 50 mL with 2% nitric acid. Immediately perform ICP-MS detection. Perform 5 parallel experiments for each group and take the average value. Specific data are shown in Table 1.
[0078] Table 1. Heavy metal removal experiment using standard solutions (%)
[0079] Pb 2+ removal rate Cd 2+ removal rate Hg 2+ removal rate As 3+ removal rate Example 1 99.6 99.8 99.7 99.9 Example 2 99.4 99.7 99.5 99.5 Example 3 99.1 99.4 99.4 99.3 Example 4 99.0 99.2 99.3 99.1 Comparative Example 1 86.3 87.6 85.1 86.7 Comparative Example 2 81.8 80.4 79.3 81.5 Comparative Example 3 65.9 58.3 60.2 62.6
[0080] Commercially available Angelica sinensis and Astragalus membranaceus were selected. 100g of the herbs were placed in the corresponding filter bags and distilled at 85-90℃ for 2 hours using a household distillation apparatus (hydrosol machine). The distillate was collected, and the heavy metal content was detected by ICP-MS. A blank control group was set up using commercially available ordinary filter bags (acrylic nonwoven fabric). Specific data are shown in Table 2.
[0081] Table 2. Heavy metal removal experiments from medicinal materials.
[0082]
[0083] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A method for preparing a herbal residue separator bag for removing heavy metals, characterized in that, The process includes the following steps: after opening, carding, and cross-laying the modified acrylic fibers, the modified acrylic nonwoven fabric is obtained by hydroentangling. The modified acrylic nonwoven fabric is then immersed in an aqueous solution of lithium-based chelating agent. After immersion, it is placed in a water bath shaker and shaken. It is then removed, washed, and air-dried. After slitting, cutting, shaping, and attaching handles, the heavy metal-removing herbal residue separator bag is obtained.
2. The preparation method according to claim 1, characterized in that, The modified acrylic fiber was prepared by the following method steps: (1) The acrylic fiber was washed and dried with acetone and deionized water, and then immersed in a polyethyleneimine aqueous solution. The reaction was carried out under ultraviolet irradiation in a nitrogen atmosphere. The product was taken out, washed and dried to obtain aminated fiber. (2) The amino-modified fiber was dispersed in THF, and chloroacetyl chloride and triethylamine were slowly added under nitrogen atmosphere and ice bath. The reaction was carried out at room temperature. The product was filtered, washed and dried to obtain intermediate fiber. (3) Add β-cyclodextrin and anhydrous sodium carbonate to DMSO, then add intermediate fiber, sonicate, stir and react under nitrogen atmosphere, filter, wash and dry the product to obtain modified acrylic fiber.
3. The preparation method according to claim 2, characterized in that, In step (1), the ratio of acrylic fiber to polyethyleneimine aqueous solution is 10g: 400-600mL; the concentration of polyethyleneimine is 2-10wt%.
4. The preparation method according to claim 2, characterized in that, In step (1), the reaction conditions are ultraviolet irradiation at 25-40℃ for 2-8 hours, with the main wavelength of ultraviolet light being 250-400nm, and slow stirring during the reaction.
5. The preparation method according to claim 2, characterized in that, In step (2), the ratio of amino-modified cellulose, THF, chloroacetyl chloride, and triethylamine is 10g: 200-400mL: 3-8mL: 5-12mL.
6. The preparation method according to claim 2, characterized in that, In step (2), the ice bath is at 0-5°C; the reaction is then brought to room temperature for 2-5 hours.
7. The preparation method according to claim 2, characterized in that, In step (3), the ratio of β-cyclodextrin, anhydrous sodium carbonate, DMSO, and intermediate fiber is 30-60g: 8-15g: 400-600mL: 10g.
8. The preparation method according to claim 2, characterized in that, In step (3), the ultrasonic treatment lasts for 10 to 30 minutes; the stirring reaction conditions are 60 to 90°C for 12 to 24 hours.
9. The preparation method according to claim 1, characterized in that, The concentration of the lithium-based chelating agent aqueous solution is 30-50 mg / L, and the ratio of modified acrylic nonwoven fabric to lithium-based chelating agent aqueous solution is 1 g: 30-50 mL; the water bath temperature in the water bath shaker is 60-70℃, and the shaking time is 2-3 h.
10. A herbal residue separator bag for removing heavy metals, prepared by the method described in any one of claims 1 to 9.