CN116037070A - Formaldehyde purification material and preparation method thereof - Google Patents
Formaldehyde purification material and preparation method thereof Download PDFInfo
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- CN116037070A CN116037070A CN202211646356.3A CN202211646356A CN116037070A CN 116037070 A CN116037070 A CN 116037070A CN 202211646356 A CN202211646356 A CN 202211646356A CN 116037070 A CN116037070 A CN 116037070A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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Abstract
The invention discloses a formaldehyde purification material and a preparation method thereof, wherein the formaldehyde purification material comprises a polysaccharide polymer and a silver-containing compound, the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate. The formaldehyde purification material provided by the invention can be used for adsorbing and decomposing formaldehyde, and decomposing the formaldehyde into harmless CO 2 And H 2 O, strong adsorption capacity, high formaldehyde removal rate, good material stability and relatively low cost.
Description
Technical Field
The invention relates to the technical field of formaldehyde adsorption materials, in particular to a formaldehyde purification material and a preparation method thereof.
Background
Formaldehyde, also known as formaldehyde, is an organic compound of the formula HCHO or CH2O, has a molecular weight of 30.03, is a colorless, irritating gas, and has an irritating effect on the eyes, nose, etc. of humans.
In the list of carcinogens published by the world health organization International cancer research institute, the serial number 52 in 2012 in the list of class 1 carcinogens is formaldehyde formalin. Formaldehyde is a substance with higher toxicity, and the PC009 formaldehyde is listed in the first batch of the toxic chemical priority control list in China. Formaldehyde has been identified by the world health organization as a carcinogenic and teratogenic substance.
Research shows that formaldehyde has strong carcinogenic and cancer-promoting effects. The effect of formaldehyde on human health is mainly manifested in the aspects of abnormal smell, stimulation, allergy, abnormal lung function, abnormal liver function, abnormal immune function and the like. When the concentration of the air reaches 0.06-0.07 mg/cubic meter in each cubic meter of air, the children can generate slight asthma. When the formaldehyde content in the indoor air is 0.1 mg/cubic meter, the indoor air has peculiar smell and uncomfortable feeling; when reaching 0.5 mg/cubic meter, the eye can be stimulated, and lacrimation is caused; up to 0.6 mg/cubic meter may cause discomfort or pain in the throat. At higher concentrations, nausea, vomiting, cough, chest distress, asthma and even pulmonary edema can be caused; when reaching 30 mg/cubic meter, the patient can immediately get dead.
Chronic respiratory diseases can be caused by long-term exposure to low dosage formaldehyde, nasopharyngeal carcinoma, colon cancer, brain tumor, menstrual disorder, gene mutation of cell nucleus, DNA single-chain internal cross-linking and DNA and protein cross-linking, and can inhibit repair of DNA injury, pregnancy syndrome, cause neonatal chromosomal abnormality and leukemia, and cause memory and intelligence decline of teenagers. Among all contactors, children and pregnant women are particularly sensitive to formaldehyde and are more harmful. Statistics according to related data show that: 69% of human diseases are related to indoor environment, 13 ten thousand people die from indoor pollution every year in China, and more than 90% of infant leukemia patients are ill in new houses for one year.
The main sources of formaldehyde in daily life are: 1. industrial waste gas, automobile exhaust and photochemical smog for producing or using formaldehyde. 2. Building materials, interior finishing materials, furniture, smoking, cooking fume, fuel combustion and the like are main sources of indoor formaldehyde pollution. 3. Hospitals are used for disinfection of wards, instruments and equipment, dissection and pathology laboratories are used for fixing and preserving cadavers and tissue specimens, and many dental materials of stomatology, such as paraformaldehyde deactivators for root canal treatment, etc., release formaldehyde. 4. Garment materials generally contain formaldehyde. In order to achieve the effects of crease resistance, shrink resistance, flame retardance and the like of clothing, or to maintain the durability of printing and dyeing and improve the hand feeling, formaldehyde is required to be added into the auxiliary agent. The formaldehyde content in the jean casual non-ironing clothing, non-ironing shirt, pure cotton crease-resistant clothing and children's garments can exceed the standard. 5. The formaldehyde concentration in the food exceeds the standard. The formaldehyde can be used for soaking the seafood, so that the appearance of the seafood is beautiful, the product is not easy to rot or deteriorate, for example, the formaldehyde is used for soaking the seafood, the fresh form of the seafood can be fixed, the color of the fish can be kept, and the food is harmful to human bodies after the formaldehyde exceeds the standard. 6. The harmful gas released by the incineration waste contains formaldehyde.
The formaldehyde adsorption materials used in daily life mainly have three types: the active carbon formaldehyde adsorbent, the photocatalyst (photocatalyst) and the nano silver material can further improve the formaldehyde adsorption capacity of the formaldehyde adsorption material in practical application, wherein the active carbon adsorbent is physically adsorbed and can not decompose formaldehyde; the photocatalyst needs to be adsorbed under the illumination condition, so that the photocatalyst is inconvenient to use; the nano silver material has relatively high cost and is unfavorable for large-area use.
Disclosure of Invention
The invention mainly aims to provide a formaldehyde purification material and a preparation method thereof, and aims to provide a formaldehyde purification material which can decompose formaldehyde and is more convenient to use.
In order to achieve the above object, the present invention provides a formaldehyde purification material comprising a polysaccharide polymer and a silver-containing compound, wherein the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate.
Optionally, the mass ratio of the polysaccharide polymer to the silver-containing compound is 1-100:0.01-10; and/or the number of the groups of groups,
the formaldehyde purification material is in a fiber form, a film form, a non-woven fabric form or a gel form.
In order to achieve the above purpose, the invention also provides a preparation method of the formaldehyde purification material, which comprises the following steps:
mixing polysaccharide polymer raw material, silver-containing compound and water to obtain formaldehyde purifying material.
Optionally, the step of mixing the polysaccharide polymer starting material, the silver-containing compound, and water to produce a formaldehyde purification material comprises:
adding acetic acid into water, adding chitosan powder into the water under stirring, and continuing stirring until the chitosan powder is completely dissolved to obtain acetic acid solution of chitosan;
adding a silver nitrate aqueous solution into the acetic acid solution of the chitosan, and stirring to obtain a mixed solution;
and preparing the mixed solution into a composite film, composite fiber or composite non-woven fabric to obtain the formaldehyde purifying material.
Optionally, the step of preparing the mixed solution into a composite film, a composite fiber or a composite nonwoven fabric comprises the following steps:
coating the mixed solution on a template to form a film, and then removing acetic acid and water from the film to prepare a composite film; or alternatively, the process may be performed,
preparing the mixed solution into composite fibers through wet spinning; or alternatively, the process may be performed,
and preparing the mixed solution into composite fibers through wet spinning, and preparing the composite fibers into composite non-woven fabrics.
Optionally, the mass ratio of the acetic acid to the chitosan powder to the silver nitrate to the water is 1-10:1-10:0.01-10:100.
Optionally, the step of mixing the polysaccharide polymer starting material, the silver-containing compound, and water to produce a formaldehyde purification material comprises:
dissolving silver nitrate in water, adding chitosan fiber into the water, mixing, centrifuging and drying to obtain composite fiber, and obtaining formaldehyde purification material; or alternatively, the process may be performed,
dissolving silver nitrate in water, adding chitosan fiber, mixing, centrifuging and drying to obtain composite fiber, and preparing the composite fiber into composite non-woven fabric to obtain the formaldehyde purification material.
Optionally, the mass ratio of the silver nitrate to the water to the chitosan fiber is 0.01-10:1000:100.
Optionally, the step of mixing the polysaccharide polymer starting material, the silver-containing compound, and water to produce a formaldehyde purification material comprises:
adding a silver-containing compound and a polysaccharide polymer raw material into water, and stirring and mixing to form a composite gel to obtain a formaldehyde purification material; wherein the polysaccharide polymer comprises carboxymethyl chitosan powder, carboxymethyl chitosan fiber or carboxymethyl chitosan non-woven fabric, and the silver-containing compound comprises silver nitrate, silver sulfadiazine or silver sulfate.
Optionally, the mass ratio of the polysaccharide polymer raw material, water and the silver-containing compound is 0.01-10:100:1-20.
In the technical scheme provided by the invention, the formaldehyde purification material comprises a polysaccharide polymer and a silver-containing compound, wherein the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate; thus, the formaldehyde purification material can be used for adsorbing and decomposing formaldehyde and decomposing the formaldehyde into harmless CO 2 And H 2 O, strong adsorption capacity, high formaldehyde removal rate, good material stability and relatively low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other related drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 to 2 are physical photographs of some embodiments of formaldehyde purification materials provided by the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a formaldehyde purification material, which comprises a polysaccharide polymer and a silver-containing compound, wherein the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate.
In the technical scheme provided by the invention, the formaldehyde purification material comprises a polysaccharide polymer and a silver-containing compound, wherein the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate; wherein, the chitosan is a natural fiber material next to cellulose, and the amino group in the molecular structure of the chitosan has stronger reactivity than the acetyl group in the molecule of the chitin, so that the polysaccharide has excellent biological functions and can carry out chemical modification reaction, and has biodegradability and biologyAfter the compound is compounded and modified with silver-containing compound, amino and formaldehyde in the silver-containing chitosan can quickly form semi-aminal (hemiaminal) or aminal (N, O-acetate), and these acetal structures can be quickly oxidized into CO by surrounding silver-containing compound 2 And H 2 O, the silver particles of nanometer to micrometer level are generated simultaneously, so that formaldehyde can be effectively adsorbed and decomposed, color-changing reaction can be displayed, the formaldehyde removal effect is indicated, the adsorption capacity is high, the formaldehyde removal rate is high, the material stability is good, the cost is relatively low, and the method is suitable for removing formaldehyde in various different places such as families, public places, factories, vehicles and the like.
In the invention, the formaldehyde removal mechanism of the formaldehyde purification material obtained after the compound modification of chitosan and silver-containing compound is as follows:
the formaldehyde removal mechanism of the formaldehyde purification material with enhanced effect obtained after the composite modification of carboxymethyl chitosan and the silver-containing compound is as follows:
in summary, the formaldehyde purification material provided by the invention has the following characteristics: (1) The chitosan is a product of removing partial acetyl of natural polysaccharide chitin, and has multiple functions of biodegradability, biocompatibility, nontoxicity, bacteriostasis, anticancer, lipid-lowering, immunity enhancing and the like; (2) The formaldehyde-removing product compounded by chitosan and silver can directly decompose formaldehyde to generate carbon dioxide and water, and the decomposition process is odorless, volatile and corrosive; (3) Can realize rapid capture and efficient collapse of formaldehyde, is not influenced by external temperature, light and other factors, the formaldehyde removal rate in 24 hours can reach 87.2%, and the duration of the product is longer than 3 months.
Further, in the embodiment of the invention, the mass ratio of the polysaccharide polymer to the silver-containing compound is 1-100:0.01-10.
In addition, the formaldehyde purification material provided by the invention can be prepared into various formaldehyde removal materials with different forms, including but not limited to formaldehyde removal materials in fiber form, film form, non-woven fabric form or gel form, so as to adapt to different application scenes. Specifically, the formaldehyde purification material can be made into composite fibers, composite films, composite non-woven fabrics, composite gels or the like, and correspondingly, the polysaccharide polymer can also be a plurality of raw materials with different forms, such as powder materials, fiber materials, non-woven fabrics or the like. In other embodiments of the present invention, the formaldehyde purification material may also be in particulate form.
Specifically, in some embodiments of the present invention, the polysaccharide polymer in the formaldehyde purification material is chitosan powder, the mass ratio of the polysaccharide polymer to the silver-containing compound is 1-10:0.01-10, and further, the silver-containing compound is preferably silver nitrate. In some embodiments of the present invention, the polysaccharide polymer in the formaldehyde purification material is chitosan fiber, the mass ratio of the polysaccharide polymer to the silver-containing compound is 100:0.01-10, and further, the silver-containing compound is preferably silver nitrate. In some embodiments of the invention, the polysaccharide polymer in the formaldehyde purification material is carboxymethyl chitosan, and the mass ratio of the polysaccharide polymer to the silver-containing compound is 1-20:0.01-10.
Based on the formaldehyde purification material provided by the invention, the invention also provides a preparation method of the formaldehyde purification material, which comprises the following steps:
mixing polysaccharide polymer raw material, silver-containing compound and water to obtain formaldehyde purifying material.
The present invention is not limited to the form of the polysaccharide polymer raw material, including but not limited to powder, fiber, nonwoven fabric, etc., and any of the raw materials may be used to prepare formaldehyde purification material products in the form of particles, fibers, films, nonwoven fabrics, and gels, which will be described in detail below with reference to specific examples.
In some embodiments of the present invention, the polysaccharide polymer material is chitosan powder, the silver-containing compound is silver nitrate, and the formaldehyde purification material is in the form of a film, a fiber or a nonwoven fabric, and the preparing steps include:
step S10a, adding acetic acid into water, then adding chitosan powder into the water under the stirring action, and continuing to stir until the chitosan powder is completely dissolved to obtain an acetic acid solution of chitosan;
step S20a, adding a silver nitrate aqueous solution into the acetic acid solution of the chitosan, and stirring to obtain a mixed solution;
and step S30a, preparing the mixed solution into a composite film, a composite fiber or a composite non-woven fabric to obtain the formaldehyde purification material.
Firstly, adding acetic acid into water, then adding chitosan powder into acetic acid water solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain acetic acid solution of chitosan; then, adding a silver nitrate aqueous solution into the acetic acid solution of the chitosan to prepare a mixed solution; and finally, according to the product requirement, correspondingly adopting different technological methods to prepare a composite film, a composite fiber or a composite non-woven fabric from the mixed solution, and thus obtaining the formaldehyde purification material.
The mode of preparing the mixed solution into the composite film can be as follows: and coating the mixed solution on a template to form a film, and then removing acetic acid and water in the film at low temperature and low pressure to prepare the composite film. By utilizing the characteristic that chitosan can form a film, the chitosan can be dissolved by acid to form a composite solution with silver nitrate, and then the composite film of chitosan and silver nitrate is formed through film forming and low-temperature demolding processes.
The mode of preparing the mixed solution into the composite fiber can be as follows: and preparing the mixed solution into composite fibers through wet spinning. The mixed solution can be prepared into the composite fiber of chitosan and silver nitrate by utilizing the characteristic of good spinnability of chitosan and adopting a wet spinning process.
The mode of preparing the mixed solution into the composite non-woven fabric can be as follows: the mixed solution is firstly spun into composite fibers through a wet method, and then the composite fibers are manufactured into the composite non-woven fabric through a needling or water needling process. Similarly, by utilizing the characteristic that chitosan has good spinnability, the mixed solution is prepared into the composite fiber of chitosan and silver nitrate by adopting a wet spinning process, and then the prepared composite fiber is subjected to needling and hydroentanglement to prepare the composite non-woven fabric, so that the composite non-woven fabric of chitosan and silver nitrate can be prepared, and the actual photograph is shown in figure 1.
The method provided by the invention can correspondingly prepare the chitosan composite silver nitrate fiber, film or non-woven fabric, and can further obtain products with various specifications so as to adapt to different application scene requirements. Further, in the above embodiment, it is preferable that the mass ratio of the acetic acid, the chitosan powder, the silver nitrate and the water is 1-10:1-10:0.01-10:100, so that the mixed solution is easier to prepare and obtain, and the formaldehyde purification material finally prepared has excellent formaldehyde removal effect.
In some embodiments of the invention, the polysaccharide polymer material is chitosan fiber, the silver-containing compound is silver nitrate, and the formaldehyde purification material is in the form of fiber or nonwoven. Wherein, when the formaldehyde purification material is in a fiber form, the preparation steps thereof comprise:
and step S10b, dissolving silver nitrate in water, adding chitosan fibers into the water, mixing, centrifuging and drying to obtain composite fibers, and obtaining the formaldehyde purification material. The mixed solution can be prepared into the composite fiber of chitosan and silver nitrate by utilizing the characteristic of good spinnability of chitosan and adopting a wet spinning process.
When the formaldehyde purification material is in the form of a non-woven fabric, the preparation method comprises the following steps:
and step S10c, dissolving silver nitrate in water, adding chitosan fibers into the water, mixing, centrifuging and drying to obtain composite fibers, and preparing the composite fibers into composite non-woven fabrics through a needling or water needling process to obtain the formaldehyde purification material. The method comprises the steps of preparing a composite fiber of chitosan and silver nitrate by using the characteristic of good spinnability of chitosan and adopting a wet spinning process, and then performing needling and hydroentangling on the prepared composite fiber to prepare a composite non-woven fabric, thereby preparing the composite non-woven fabric of chitosan and silver nitrate
Further, in the above-provided embodiment of the present invention, it is preferable that the mass ratio of the silver nitrate, the water and the chitosan fiber is 0.01 to 10:1000:100. Thus, the formaldehyde purification material is easy to prepare and can ensure the formaldehyde removal performance.
In some embodiments of the present invention, the polysaccharide polymer material is carboxymethyl chitosan powder, carboxymethyl chitosan fiber or carboxymethyl chitosan nonwoven fabric, the silver-containing compound is silver nitrate, silver sulfadiazine or silver sulfate, and the formaldehyde purification material is in gel form, and the preparation steps thereof include:
adding silver-containing compound and polysaccharide polymer raw materials into water, stirring and mixing to form composite gel, and obtaining the formaldehyde purification material. By utilizing the characteristic that the modified chitosan can absorb 50-100 times of the weight of water to form gel, the gel is combined with the aqueous solution of the silver-containing compound to form composite gel, and the composite gel of carboxymethyl chitosan and the silver-containing compound can be prepared, and the actual photograph is shown in figure 2.
Further, in the above-provided embodiment of the present invention, the mass ratio of the polysaccharide polymer raw material, water, and silver-containing compound is 0.01 to 10:100:1 to 20. Thus, the formaldehyde purification material is easy to prepare and can ensure the formaldehyde removal performance.
In some embodiments of the present invention, the polysaccharide polymer raw material in the formaldehyde purification material is carboxymethyl chitosan nonwoven fabric, the silver-containing compound is silver sulfadiazine, and the formaldehyde purification material is in the form of gel, and the preparation steps include: adding carboxymethyl chitosan non-woven fabric into 95% ethanol, adding silver sulfadiazine, mixing, centrifuging to separate ethanol to obtain carboxymethyl chitosan silver sulfadiazine composite non-woven fabric, adding the composite non-woven fabric into water, and stirring to form gel to obtain the formaldehyde purification material.
In some embodiments of the present invention, the formaldehyde purification material may also be in the form of particles, which may be prepared in the following manner: adding chitosan powder into a silver nitrate aqueous solution, fully and uniformly mixing, dehydrating and granulating to obtain composite particles of chitosan and silver nitrate, and obtaining the formaldehyde purification material.
The following technical solutions of the present invention will be described in further detail with reference to specific examples and drawings, and it should be understood that the following examples are only for explaining the present invention and are not intended to limit the present invention.
Example 1
(1) Adding acetic acid into water to form an acetic acid aqueous solution, adding chitosan powder into the acetic acid aqueous solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain an acetic acid solution of chitosan, wherein the mass ratio of the acetic acid to the chitosan powder to the water is controlled to be 1:1:100;
(2) Adding a silver nitrate aqueous solution into an acetic acid solution of chitosan to prepare a mixed solution, and controlling the mass ratio of chitosan powder to silver nitrate to be 1:0.01;
(3) And coating the mixed solution on a template to form a film, and then removing acetic acid and water in the film at low temperature and low pressure to prepare a composite film, thus obtaining the formaldehyde purifying material compounded by chitosan and silver nitrate.
Example 2
(1) Adding acetic acid into water to form an acetic acid aqueous solution, adding chitosan powder into the acetic acid aqueous solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain an acetic acid solution of chitosan, wherein the mass ratio of the acetic acid to the chitosan powder to the water is controlled to be 1:10:100;
(2) Adding a silver nitrate aqueous solution into an acetic acid solution of chitosan to prepare a mixed solution, and controlling the mass ratio of chitosan powder to silver nitrate to be 1:10;
(3) And preparing the mixed solution into composite fibers through wet spinning, and thus obtaining the formaldehyde purifying material compounded by chitosan and silver nitrate.
Example 3
(1) Adding acetic acid into water to form an acetic acid aqueous solution, adding chitosan powder into the acetic acid aqueous solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain an acetic acid solution of chitosan, wherein the mass ratio of the acetic acid to the chitosan powder to the water is controlled to be 10:5:100;
(2) Adding a silver nitrate aqueous solution into an acetic acid solution of the chitosan to prepare a mixed solution; controlling the mass ratio of the chitosan powder to the silver nitrate to be 1:5;
(3) And preparing the mixed solution into composite fibers through wet spinning, and preparing the composite fibers into composite non-woven fabrics through a needling or water needling process, so as to obtain the formaldehyde purifying material compounded by chitosan and silver nitrate.
Example 4
(1) Adding acetic acid into water to form an acetic acid aqueous solution, adding chitosan powder into the acetic acid aqueous solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain an acetic acid solution of chitosan, wherein the mass ratio of the acetic acid to the chitosan powder to the water is controlled to be 10:1:100;
(2) Adding a silver nitrate aqueous solution into an acetic acid solution of the chitosan to prepare a mixed solution; controlling the mass ratio of the chitosan powder to the silver nitrate to be 10:10;
(3) And preparing the mixed solution into composite fibers through wet spinning, and preparing the composite fibers into composite non-woven fabrics through a needling or water needling process, so as to obtain the formaldehyde purifying material compounded by chitosan and silver nitrate.
Example 5
(1) Adding acetic acid into water to form an acetic acid aqueous solution, adding chitosan powder into the acetic acid aqueous solution under the stirring action, and continuing stirring until the chitosan powder is completely dissolved after the addition is finished to obtain an acetic acid solution of chitosan, wherein the mass ratio of the acetic acid to the chitosan powder to the water is controlled to be 5:10:100;
(2) Adding a silver nitrate aqueous solution into an acetic acid solution of the chitosan to prepare a mixed solution; controlling the mass ratio of the chitosan powder to the silver nitrate to be 10:1;
(3) And preparing the mixed solution into composite fibers through wet spinning, and preparing the composite fibers into composite non-woven fabrics through a needling or water needling process, so as to obtain the formaldehyde purifying material compounded by chitosan and silver nitrate.
Example 6
Dissolving silver nitrate in water, adding chitosan fiber, controlling the mass ratio of the silver nitrate to the water to be 0.01:1000:100, mixing, centrifuging, and drying to obtain the composite fiber, thereby obtaining the formaldehyde purifying material compounded by the chitosan and the silver nitrate.
Example 7
Dissolving silver nitrate in water, adding chitosan fiber, controlling the mass ratio of the silver nitrate to the water to be 1:1000:100, mixing, centrifuging, drying to obtain composite fiber, and preparing the composite fiber into a composite non-woven fabric through a needling or water needling process to obtain the formaldehyde purification material compounded by the chitosan and the silver nitrate.
Example 8
Dissolving silver nitrate in water, adding chitosan fiber, controlling the mass ratio of the silver nitrate to the water to be 10:1000:100, mixing, centrifuging, drying to obtain composite fiber, and preparing the composite fiber into a composite non-woven fabric through a needling or water needling process to obtain the formaldehyde purification material compounded by the chitosan and the silver nitrate.
Example 9
Adding silver nitrate into water, uniformly stirring, adding carboxymethyl chitosan powder into a silver nitrate aqueous solution, controlling the mass ratio of polysaccharide polymer raw materials to water to silver-containing compounds to be 0.01:100:1, and stirring and mixing to form composite gel, thereby obtaining the formaldehyde purification material compounded by chitosan and silver nitrate.
Example 10
Adding silver sulfadiazine into water, uniformly stirring, adding carboxymethyl chitosan powder into aqueous solution of silver sulfadiazine, controlling the mass ratio of the carboxymethyl chitosan powder to the water to the silver sulfadiazine to be 0.1:100:5, and stirring and mixing to form composite gel, thereby obtaining the formaldehyde purification material compounded by the carboxymethyl chitosan and the silver sulfadiazine.
Example 11
Adding the carboxymethyl chitosan non-woven fabric into water, uniformly stirring, adding silver nitrate, controlling the mass ratio of the carboxymethyl chitosan non-woven fabric to the water to the silver nitrate to be 1:100:10, and stirring and mixing to form composite gel, thereby obtaining the formaldehyde purification material compounded by the carboxymethyl chitosan and the silver nitrate.
Example 12
Adding carboxymethyl chitosan non-woven fabric into 95% ethanol, adding silver sulfadiazine, fully mixing, centrifuging to separate ethanol to obtain carboxymethyl chitosan and silver sulfadiazine composite non-woven fabric, adding the carboxymethyl chitosan non-woven fabric into water, controlling the mass ratio of the carboxymethyl chitosan non-woven fabric to the water to the silver sulfadiazine to be 10:100:20, and stirring to form gel to obtain the formaldehyde purification material.
The formaldehyde purification material prepared in each example was used as a test sample, and the test was carried out according to the method for measuring the purification effect of the indoor air purification product of QB/T2761-2006 (about 20g of the sample was put into 1.5m 3 Test in the test chamber), the test results are shown in table 1 below:
table 1 results of detecting the aldehyde removal effect of the Formaldehyde purification Material prepared in each example
As shown by the detection results in Table 1, the formaldehyde purification material prepared by the embodiment of the invention can realize rapid formaldehyde removal, the 24-hour removal rate reaches 83.6-87.2%, and the formaldehyde removal process is safe and pollution-free and is not influenced by conditions such as ambient temperature or light.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The formaldehyde purification material is characterized by comprising a polysaccharide polymer and a silver-containing compound, wherein the polysaccharide polymer comprises at least one of chitosan and carboxymethyl chitosan, and the silver-containing compound comprises at least one of silver nitrate, silver sulfadiazine and silver sulfate.
2. The formaldehyde purification material of claim 1, wherein the mass ratio of the polysaccharide polymer to the silver-containing compound is 1-100:0.01-10; and/or the number of the groups of groups,
the formaldehyde purification material is in a fiber form, a film form, a non-woven fabric form or a gel form.
3. The preparation method of the formaldehyde purification material is characterized by comprising the following steps of:
mixing polysaccharide polymer raw material, silver-containing compound and water to obtain formaldehyde purifying material.
4. The method of preparing a formaldehyde purification material according to claim 3, wherein the step of mixing a polysaccharide polymer raw material, a silver-containing compound, and water to prepare the formaldehyde purification material comprises:
adding acetic acid into water, adding chitosan powder into the water under stirring, and continuing stirring until the chitosan powder is completely dissolved to obtain acetic acid solution of chitosan;
adding a silver nitrate aqueous solution into the acetic acid solution of the chitosan, and stirring to obtain a mixed solution;
and preparing the mixed solution into a composite film, composite fiber or composite non-woven fabric to obtain the formaldehyde purifying material.
5. The method for preparing a formaldehyde purification material according to claim 4, wherein the step of preparing the mixed solution into a composite film, a composite fiber or a composite nonwoven fabric comprises:
coating the mixed solution on a template to form a film, and then removing acetic acid and water from the film to prepare a composite film; or alternatively, the process may be performed,
preparing the mixed solution into composite fibers through wet spinning; or alternatively, the process may be performed,
and preparing the mixed solution into composite fibers through wet spinning, and preparing the composite fibers into composite non-woven fabrics.
6. The method for preparing a formaldehyde purification material according to claim 5, wherein the mass ratio of acetic acid, chitosan powder, silver nitrate and water is 1-10:1-10:0.01-10:100.
7. The method of preparing a formaldehyde purification material according to claim 3, wherein the step of mixing a polysaccharide polymer raw material, a silver-containing compound, and water to prepare the formaldehyde purification material comprises:
dissolving silver nitrate in water, adding chitosan fiber into the water, mixing, centrifuging and drying to obtain composite fiber, and obtaining formaldehyde purification material; or alternatively, the process may be performed,
dissolving silver nitrate in water, adding chitosan fiber, mixing, centrifuging and drying to obtain composite fiber, and preparing the composite fiber into composite non-woven fabric to obtain the formaldehyde purification material.
8. The method for preparing a formaldehyde purification material according to claim 7, wherein the mass ratio of silver nitrate, water and chitosan fiber is 0.01-10:1000:100.
9. The method of preparing a formaldehyde purification material according to claim 3, wherein the step of mixing a polysaccharide polymer raw material, a silver-containing compound, and water to prepare the formaldehyde purification material comprises:
adding a silver-containing compound and a polysaccharide polymer raw material into water, and stirring and mixing to form a composite gel to obtain a formaldehyde purification material; wherein the polysaccharide polymer comprises carboxymethyl chitosan powder, carboxymethyl chitosan fiber or carboxymethyl chitosan non-woven fabric, and the silver-containing compound comprises silver nitrate, silver sulfadiazine or silver sulfate.
10. The method for preparing a formaldehyde purification material according to claim 9, wherein the mass ratio of the polysaccharide polymer raw material, water and the silver-containing compound is 0.01-10:100:1-20.
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