Quantum dot composite formaldehyde removal materials and their applications

Abstract

The present invention provides a quantum dot composite formaldehyde removal material and its application, specifically relating to the field of air purification technology. In the quantum dot composite formaldehyde removal material, the quantum dots are Fe2O3 / ZnO / C quantum dots; the preparation method of the quantum dot composite formaldehyde removal material comprises the following steps: A. uniformly mixing iron salt, surfactant, organic solvent and water, performing a hydrothermal reaction, centrifuging and washing to obtain a Fe2O3 precursor; B. adding the Fe2O3 precursor to a zinc source solution, then adding an organic ligand, mixing uniformly, centrifuging and washing to obtain a precipitate; C. calcining the precipitate to obtain the quantum dot composite formaldehyde removal material. The quantum dot composite formaldehyde removal material adopts a combination of adsorption and catalytic decomposition for indoor harmful gases, which not only overcomes the problem of small adsorption capacity, but also solves the problem of decomposition at room temperature. It can decompose indoor harmful gases into harmless substances, does not produce secondary pollution, and is easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to a quantum dot composite formaldehyde removal material and applications thereof. Background Art

[0002] With socioeconomic development and improved living standards, people are increasingly demanding higher quality of their living environment. Air quality is directly linked to their quality of life and physical and mental health. Indoor air pollution has become one of the primary health hazards to humans caused by environmental pollution. Formaldehyde, benzene, and TVOC, as major sources of indoor air pollutants, have been designated as carcinogens by the World Health Organization (WHO) and pose a significant threat to human health. Long-term exposure to or work in environments with excessively high levels of formaldehyde, benzene, and TVOC can cause varying degrees of abdominal pain, dizziness, and respiratory damage. In severe cases, this can lead to liver damage, renal failure, and even chromosomal abnormalities. Therefore, research into methods to prevent and control indoor air pollutants is of great significance to the health of the nation.

[0003] Ventilation is the simplest, most direct, and most economical method for managing indoor air quality. Organic volatiles such as formaldehyde, benzene, and TVOC have low boiling points, and heating can accelerate their volatilization. Ventilation can then effectively improve indoor air quality. However, due to the long incubation period of formaldehyde, ventilation alone cannot fundamentally improve indoor air quality. Physical adsorption primarily utilizes certain adsorbents to absorb harmful substances, thereby removing harmful pollution. Its main products are porous materials such as activated carbon and molecular sieves. While activated carbon has excellent adsorption properties, it has certain drawbacks as an adsorption material. It cannot completely remove indoor pollutants and may also pose a risk of re-contamination. Photocatalyst products generally require ultraviolet light to function, limiting their application. Single formaldehyde scavengers and ammonia-based substances do not completely remove formaldehyde and can cause secondary pollution.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a quantum dot composite formaldehyde removal material, aiming to solve at least one of the above-mentioned technical problems in the prior art.

[0006] A second object of the present invention is to provide an application of a quantum dot composite formaldehyde removal material.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0008] The first aspect of the present invention provides a quantum dot composite formaldehyde removal material, wherein the quantum dots are Fe2O3 / ZnO / C quantum dots;

[0009] The preparation method of the quantum dot composite formaldehyde-removing material comprises the following steps:

[0010] A. Evenly mix iron salt, surfactant, organic solvent and water, conduct hydrothermal reaction, and centrifuge and wash to obtain Fe2O3 precursor.

[0011] B. Add the Fe2O3 precursor to the zinc source solution, then add the organic ligand, mix well, and centrifuge to obtain a precipitate.

[0012] C. calcining the precipitate to obtain the quantum dot composite formaldehyde-removing material.

[0013] Furthermore, the iron salt includes at least one of ferric chloride, ferric nitrate and ferric sulfate.

[0014] The surfactant includes at least one of disodium ethylenediaminetetraacetic acid, sodium octadecyl sulfate, sodium dodecylbenzenesulfonate, citric acid and polyvinylpyrrolidone.

[0015] The organic solvent includes at least one of tert-butyl alcohol, anhydrous ethanol, methanol and glycerol.

[0016] Furthermore, in step A, in parts by weight, 0.5 to 10 parts of iron salt, 0.05 to 5 parts of surfactant, 40 to 60 parts of organic solvent and 30 to 50 parts of water are used.

[0017] Furthermore, the zinc source includes zinc nitrate and / or zinc chloride.

[0018] The organic ligand includes at least one of ethylenediaminetetraacetic acid, 4,5-dicyanoimidazole, terephthalic acid, 2,3-pyridine anhydride and 1-isobutyl-2-methylimidazole.

[0019] Furthermore, in step B, the zinc source is 1 to 15 parts and the organic ligand is 2 to 35 parts by weight.

[0020] Furthermore, the calcination temperature is 200-320° C., and the calcination time is 2-8 hours.

[0021] Furthermore, in the zinc source solution, the mass content of the zinc source is 4-25%.

[0022] Furthermore, the temperature of the hydrothermal reaction is 80-160° C., and the time is 12-20 hours.

[0023] Furthermore, in step B, the mixing time is 0.5 to 12 hours.

[0024] The second aspect of the present invention provides the use of the quantum dot composite formaldehyde removal material in a formaldehyde removal kit or air purification equipment.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The quantum dot composite formaldehyde removal material provided by the present invention adopts a composite process to remove formaldehyde by constructing a heterojunction composite material. It has good controllability, strong practicality, high formaldehyde removal efficiency, and will not generate secondary pollution during use. The Fe2O3 precursor and the formed ZIF-8 are calcined to obtain the Fe2O3 / ZnO / C quantum dots with rich pore structures, high active sites, and increased surface functional groups, so that it has special adsorption properties and catalytic characteristics. The quantum dot composite formaldehyde removal material adopts a combination of adsorption and catalytic decomposition for indoor harmful gases, which not only overcomes the problem of small adsorption capacity, but also solves the problem of decomposability at room temperature. It can decompose indoor harmful gases into harmless substances, does not generate secondary pollution, and is easy to operate.

[0027] The application provided by the present invention, in view of the advantages of the above-mentioned quantum dot composite formaldehyde removal material, provides a formaldehyde removal material with better performance for formaldehyde removal kits or air purification equipment, improves the efficiency of formaldehyde removal, and makes the air purification process more efficient and environmentally friendly. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0030] The first aspect of the present invention provides a quantum dot composite formaldehyde removal material, wherein the quantum dots are Fe2O3 / ZnO / C quantum dots;

[0031] The preparation method of the quantum dot composite formaldehyde-removing material comprises the following steps:

[0032] A. Evenly mix iron salt, surfactant, organic solvent and water, conduct hydrothermal reaction, and centrifuge and wash to obtain Fe2O3 precursor.

[0033] B. Add the Fe2O3 precursor to the zinc source solution, then add the organic ligand, mix well, and centrifuge to obtain a precipitate.

[0034] C. calcining the precipitate to obtain the quantum dot composite formaldehyde-removing material.

[0035] The quantum dot composite formaldehyde removal material provided by the present invention adopts a composite process to remove formaldehyde by constructing a heterojunction composite material. It has good controllability, strong practicality, high formaldehyde removal efficiency, and will not generate secondary pollution during use. The Fe2O3 / ZnO / C quantum dots obtained by calcining the Fe2O3 precursor with ZIF-8 have rich pore structures, high active sites, and increased surface functional groups, which give them special adsorption properties and catalytic characteristics. The quantum dot composite formaldehyde removal material adopts a combined method of adsorption and catalytic decomposition for indoor harmful gases, which not only overcomes the problem of small adsorption capacity, but also solves the problem of decomposability at room temperature. It can decompose indoor harmful gases into harmless substances, does not generate secondary pollution, and is easy to operate.

[0036] Furthermore, the iron salt includes at least one of ferric chloride, ferric nitrate and ferric sulfate.

[0037] The surfactant includes at least one of disodium ethylenediaminetetraacetic acid, sodium octadecyl sulfate, sodium dodecylbenzenesulfonate, citric acid and polyvinylpyrrolidone.

[0038] In step A, the iron salt is hydrolyzed in water to generate iron hydroxide and iron hydrate, and then under high temperature and high pressure hydrothermal conditions, the iron hydroxide is dehydrated to generate Fe2O3 precursor.

[0039] In this process, surfactants play a role in stabilizing the colloid, promoting the mixing of reactants, and affecting the morphology of the products, while organic solvents affect the reaction rate and product morphology.

[0040] The organic solvent includes at least one of tert-butyl alcohol, anhydrous ethanol, methanol and glycerol.

[0041] Furthermore, in step A, in parts by weight, 0.5 to 10 parts of iron salt, 0.05 to 5 parts of surfactant, 40 to 60 parts of organic solvent and 30 to 50 parts of water are used.

[0042] Typically but not limiting, the weight portion of the iron salt can be 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 parts, or any value within the range of 0.5 to 10 parts; the weight portion of the surfactant can be 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 1, 2, 3, 4 or 5 parts, or any value within the range of 0.05 to 5 parts; the weight portion of the organic solvent can be 40, 45, 50, 55 or 60 parts, or any value within the range of 40 to 60 parts; the weight portion of water can be 30, 35, 40, 45 or 50 parts, or any value within the range of 30 to 50 parts.

[0043] In step B, a coordination reaction occurs between zinc ions and organic ligands, involving the interaction between the empty orbitals of zinc ions and the lone pair electrons on the nitrogen atoms of the organic ligands to form coordination bonds. After the coordination reaction, the formed coordination compound self-assembles in the solution to form ZIF-8 with a porous and crystalline structure, ultimately forming a composite structure of Fe2O3 precursor and ZIF-8.

[0044] Furthermore, the zinc source includes zinc nitrate and / or zinc chloride.

[0045] The organic ligand includes at least one of ethylenediaminetetraacetic acid, 4,5-dicyanoimidazole, terephthalic acid, 2,3-pyridine anhydride and 1-isobutyl-2-methylimidazole.

[0046] Furthermore, in step B, the zinc source is 1 to 15 parts and the organic ligand is 2 to 35 parts by weight.

[0047] Typically but not limiting, the weight amount of the zinc source can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, or any value within the range of 1 to 15 parts; the weight amount of the organic ligand can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts or 35 parts, or any value within the range of 2 to 35 parts.

[0048] Furthermore, the calcination temperature is 200-320° C., and the calcination time is 2-8 hours.

[0049] Typically, but not limiting, the calcination temperature can be 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 310°C or 320°C, or any value within the range of 200-320°C; the calcination time can be 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours or 8 hours, or any value within the range of 2-8 hours.

[0050] Furthermore, the zinc source solution has a zinc source content of 4% to 25% by weight. Typically, but not limiting, the zinc source content of the zinc source solution may be, for example, 4%, 8%, 12%, 16%, 20%, 23%, or 25% by weight, or any value within the range of 4% to 25%.

[0051] Furthermore, the temperature of the hydrothermal reaction is 80-160°C, and the time is 12-20 hours. Typically but not limiting, the temperature of the hydrothermal reaction can be, for example, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, or 160°C, or any value within the range of 80°C-160°C; the time of the hydrothermal reaction can be, for example, 12 hours, 14 hours, 16 hours, 18 hours, or 20 hours, or any value within the range of 12 hours-20 hours.

[0052] Furthermore, in step B, the mixing time is 0.5 to 12 hours. Typically but not limitatively, in step B, the mixing time can be, for example, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours or 12 hours, or any value within the range of 0.5 to 12 hours.

[0053] The second aspect of the present invention provides the use of the quantum dot composite formaldehyde removal material in a formaldehyde removal kit or air purification equipment.

[0054] The application provided by the present invention, in view of the advantages of the above-mentioned quantum dot composite formaldehyde removal material, provides a formaldehyde removal material with better performance for formaldehyde removal kits or air purification equipment, improves the efficiency of formaldehyde removal, and makes the air purification process more efficient and environmentally friendly.

[0055] The present invention is further illustrated below by specific examples and comparative examples. However, it should be understood that these examples are merely for the purpose of further explanation and should not be construed as limiting the present invention in any form. The raw materials used in the examples and comparative examples of the present invention, unless otherwise specified, were prepared under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments used without manufacturer's indication are all commercially available conventional products.

[0056] Example 1

[0057] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0058] 1. Mix 2 kg of ferric chloride, 0.15 kg of disodium ethylenediaminetetraacetic acid, 50 kg of methanol and 40 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0059] 2. Add the Fe2O3 precursor to a solution containing 2.35 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 8.5%), add 5.5 kg of 4,5-dicyanoimidazole, stir at room temperature for 6 hours, centrifuge and wash to obtain a precipitate, and finally calcine the precipitate at 200 ° C for 6 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0060] Example 2

[0061] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0062] 1. Mix 4 kg of ferric chloride, 0.5 kg of polyvinyl pyrrolidone, 45 kg of methanol and 45 kg of deionized water in proportion, carry out hydrothermal reaction at 160 ° C for 12 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0063] 2. Add the Fe2O3 precursor to a solution containing 2 kg of zinc chloride (the mass percentage concentration of zinc chloride is 6%), add 3.5 kg of 4,5-dicyanoimidazole, stir at room temperature for 8 hours, centrifuge and wash to obtain a precipitate, and finally calcine at 200°C for 6 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0064] Example 3

[0065] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0066] 1. Mix 0.5 kg of ferric nitrate, 0.5 kg of polyvinyl pyrrolidone, 40 kg of glycerol and 50 kg of deionized water in a proportion by mass, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0067] 2. Add the Fe2O3 precursor to a solution containing 4 kg of zinc chloride (the mass percentage concentration of zinc chloride is 15%), add 5 kg of 1-isobutyl-2-methylimidazole, stir at room temperature for 2 hours, centrifuge and wash to obtain a precipitate, and finally calcine at 240 ° C for 3 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0068] Example 4

[0069] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0070] 1. Mix 1 kg of ferric nitrate, 0.5 kg of sodium dodecylbenzenesulfonate, 40 kg of anhydrous ethanol and 50 kg of deionized water in a proportion by mass, carry out hydrothermal reaction at 150 ° C for 16 hours, and centrifuge and wash after the reaction to obtain an Fe2O3 precursor.

[0071] 2. Add the Fe2O3 precursor to a solution containing 4.5 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 10%), add 4 kg of 1-isobutyl-2-methylimidazole, stir at room temperature for 12 hours, centrifuge and wash to obtain a precipitate, and finally calcine at 260°C for 2.5 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0072] Example 5

[0073] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0074] 1. Mix 3.5 kg of ferric sulfate, 2 kg of citric acid, 40 kg of anhydrous ethanol and 50 kg of deionized water in a proportion by mass, carry out hydrothermal reaction at 160 ° C for 12 hours, and centrifuge and wash after the reaction to obtain an Fe2O3 precursor.

[0075] 2. Add the Fe2O3 precursor to a solution containing 2.5 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 4.5%), add it to 2 kg of terephthalic acid, stir it at room temperature for 8 hours, centrifuge and wash it to obtain a precipitate, and finally calcine it at 300 ° C for 1.5 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0076] Example 6

[0077] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0078] 1. Mix 2 kg of ferric chloride, 0.05 kg of disodium ethylenediaminetetraacetic acid, 50.1 kg of methanol and 40 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0079] 2. Same as the step in Example 1.

[0080] Example 7

[0081] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0082] 1. Mix 2 kg of ferric chloride, 5 kg of disodium ethylenediaminetetraacetic acid, 50 kg of methanol and 35.15 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0083] 2. Same as the step in Example 1.

[0084] Example 8

[0085] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0086] 1. Mix 2 kg of ferric chloride, 0.15 kg of disodium ethylenediaminetetraacetic acid, 40 kg of methanol and 50 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0087] 2. Same as the step in Example 1.

[0088] Example 9

[0089] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0090] 1. Mix 2 kg of ferric chloride, 0.15 kg of disodium ethylenediaminetetraacetic acid, 60 kg of methanol and 30 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0091] 2. Same as the step in Example 1.

[0092] Example 10

[0093] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0094] 1. Mix 0.5 kg of ferric chloride, 0.15 kg of disodium ethylenediaminetetraacetic acid, 51.5 kg of methanol and 40 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0095] 2. Same as the step in Example 1.

[0096] Example 11

[0097] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0098] 1. Mix 10 kg of ferric chloride, 5 kg of disodium ethylenediaminetetraacetic acid, 20 kg of methanol and 15 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0099] 2. Add the Fe2O3 precursor to a solution containing 15 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 8.5%), add 35 kg of 4,5-dicyanoimidazole, stir at room temperature for 6 hours, centrifuge and wash to obtain a precipitate, and finally calcine the precipitate at 200 ° C for 6 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0100] Example 12

[0101] This embodiment provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0102] 1. Same as the step in Example 1.

[0103] 2. Add the Fe2O3 precursor to a solution containing 1 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 8.5%), add 6.85 kg of 4,5-dicyanoimidazole, stir at room temperature for 6 hours, centrifuge and wash to obtain a precipitate, and finally calcine the precipitate at 200°C for 6 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0104] Comparative Example 1

[0105] This comparative example provides a quantum dot composite formaldehyde removal material, and the preparation steps are as follows:

[0106] 1. Mix 2 kg of ferric chloride, 50 kg of methanol and 40 kg of deionized water in proportion, carry out hydrothermal reaction at 120 ° C for 14 hours, and centrifuge and wash after the reaction to obtain Fe2O3 precursor.

[0107] 2. Add the Fe2O3 precursor to a solution containing 2.5 kg of zinc nitrate (the mass percentage concentration of zinc nitrate is 8.5%), add 5.5 kg of 4,5-dicyanoimidazole, stir at room temperature for 6 hours, centrifuge and wash to obtain a precipitate, and finally calcine the precipitate at 200 ° C for 6 hours to prepare a Fe2O3 / ZnO / C quantum dot composite formaldehyde removal material with excellent formaldehyde removal performance.

[0108] Comparative Example 2

[0109] This comparative example provides a quantum dot composite formaldehyde removal material. The difference from Example 1 is that the solvent is all 90 kg of methanol, and no deionized water is added. The remaining raw materials and preparation steps are the same as those in Example 1 and will not be repeated here.

[0110] Comparative Example 3

[0111] This comparative example provides a quantum dot composite formaldehyde removal material. The difference from Example 1 is that the solvent is entirely 90 kg of deionized water, and no methanol is added. The remaining raw materials and preparation steps are the same as those in Example 1 and will not be repeated here.

[0112] Test Case

[0113] The formaldehyde removal materials obtained in the examples and comparative examples were subjected to performance tests.

[0114] The performance test method is:

[0115] 1. Clean 30m 3 Inject 0.5 mL of analytical grade formaldehyde into the environmental chamber, seal the chamber, turn on the stirring device, and test the formaldehyde concentration C0 in the environmental chamber after 30 minutes.

[0116] 2. Clean the environmental chamber, place the formaldehyde removal material in the chamber, inject 0.5 mL of analytical grade formaldehyde diluent, and seal the chamber. Turn on the stirring device and test the formaldehyde concentration C1 in the chamber after 30 minutes.

[0117] Calculate the purification efficiency R=(C0-C1) / C0×100%.

[0118] The obtained data are shown in Table 1 below.

[0119] Table 1

[0120]

[0121] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A quantum dot composite formaldehyde removal material, characterized in that: The quantum dots are Fe2O3 / ZnO / C quantum dots; The preparation method of the quantum dot composite formaldehyde-removing material comprises the following steps: A. Mixing iron salt, surfactant, organic solvent and water uniformly, performing hydrothermal reaction, and centrifuging and washing to obtain Fe2O3 precursor; B. adding the Fe2O3 precursor to a zinc source solution, then adding an organic ligand, mixing well, and centrifuging and washing to obtain a precipitate; C. calcining the precipitate to obtain the quantum dot composite formaldehyde-removing material; Wherein, the surfactant comprises at least one of disodium ethylenediaminetetraacetic acid, sodium octadecyl sulfate, sodium dodecylbenzenesulfonate, citric acid and polyvinylpyrrolidone; The organic ligand includes at least one of ethylenediaminetetraacetic acid, 4,5-dicyanoimidazole, terephthalic acid, 2,3-pyridine dicarboxylic anhydride and 1-isobutyl-2-methylimidazole.

2. The quantum dot composite formaldehyde removal material according to claim 1, characterized in that The iron salt includes at least one of ferric chloride, ferric nitrate and ferric sulfate; The organic solvent includes at least one of tert-butyl alcohol, anhydrous ethanol, methanol and glycerol.

3. The quantum dot composite formaldehyde removal material according to claim 1, characterized in that In step A, based on weight parts, 0.5-10 parts of iron salt, 0.05-5 parts of surfactant, 40-60 parts of organic solvent and 30-50 parts of water are used.

4. The quantum dot composite formaldehyde removal material according to claim 1, characterized in that The zinc source includes zinc nitrate and / or zinc chloride.

5. The quantum dot composite formaldehyde removal material according to claim 1, characterized in that: In step B, the zinc source is 1 to 15 parts and the organic ligand is 2 to 35 parts by weight.

6. The quantum dot composite formaldehyde removal material according to any one of claims 1 to 5, characterized in that: The calcination temperature is 200-320° C., and the calcination time is 2-8 hours.

7. The quantum dot composite formaldehyde removal material according to any one of claims 1 to 5, characterized in that: In the zinc source solution, the mass content of the zinc source is 4-25%.

8. The quantum dot composite formaldehyde removal material according to any one of claims 1 to 5, characterized in that: The temperature of the hydrothermal reaction is 80-160° C., and the time is 12-20 hours.

9. The quantum dot composite formaldehyde removal material according to any one of claims 1 to 5, characterized in that: In step B, the mixing time is 0.5 to 12 hours.

10. Use of the quantum dot composite formaldehyde removal material according to any one of claims 1 to 9 in a formaldehyde removal kit or air purification equipment.

Images