A method for growing nano-titanium dioxide on the surface of cloth in situ

Abstract

The application discloses a method for growing nano-titanium dioxide on the surface of cloth in situ, which comprises the following steps: putting the cloth into a hydrogen peroxide aqueous solution and heating and treating the cloth at 70-90 DEG C for 2-3 hours; adding copper acetate into the solution, wherein the mass fraction of the copper acetate in the solution is 0.01-0.1 ppm, and continuing to heat and treat the cloth at 70-90 DEG C for 1 hour after the addition of the copper acetate; taking out and drying the cloth; immersing the dried cloth into a titanic acid solution and soaking the cloth at 40-50 DEG C for 1-2 hours; taking out the cloth soaked in the titanic acid solution; extruding the cloth soaked in the titanic acid solution to obtain a cloth containing the titanic acid solution with a mass fraction of 50-80%; and heat-treating the cloth containing the titanic acid solution under a sealed condition to obtain a cloth material with nano-titanium dioxide grown on the surface in situ.

Description

Technical Field

[0001] This application specifically relates to a method for in-situ growth of nano-titanium dioxide on the surface of fabric. Background Technology

[0002] Nano-titanium dioxide refers to titanium dioxide with a particle size of less than 100 nanometers. It possesses unique characteristics such as small particle size, high specific surface area, excellent photocatalytic activity, stable chemical and thermal properties, and super-affinity, giving it irreplaceable advantages in applications such as air purification, sterilization and disinfection, self-cleaning materials, and sunscreens. Loading nano-titanium dioxide onto the surface of different substrate materials is a prerequisite for its application in photocatalytic decomposition of pollutants, self-cleaning, and UV protection. Loading nano-titanium dioxide can improve its utilization efficiency, reduce shedding, and increase recyclability.

[0003] Currently, there are two main loading methods for nano-titanium dioxide: (1) Direct spraying method: This method is relatively simple to operate. It mainly involves preparing an aqueous solution of nano-titanium dioxide, spraying it onto the surface of the substrate material, and then drying it. In order to make the load firm, a binder is usually added during the preparation of the nano-titanium dioxide aqueous solution. (2) Spraying and sintering method: This method involves spraying nano-titanium dioxide or nano-titanium dioxide precursors onto the surface of the substrate material, drying it, and then sintering it at high temperature.

[0004] The above-mentioned main loading methods and the substrate materials have problems, mainly in the following aspects: (1) The primary particle size of nano-titanium dioxide particles obtained by direct spraying is usually greater than 50 nanometers, forming micron-scale particle agglomerates, which are easy to fall off after spraying; (2) A binder needs to be added. After the binder is added, firstly, the photocatalytic activity of nano-titanium dioxide is greatly reduced, and secondly, the substrate material turns yellow, affecting its use and aesthetics; (3) The spraying sintering method requires a high-temperature sintering process and can only be operated on the surface of high-temperature resistant materials such as metals and ceramics. The surface area of ​​these materials is not large, resulting in a low titanium dioxide loading content. Moreover, the nano-titanium dioxide particles become larger after high-temperature sintering, further reducing the application performance; (4) The main loading materials such as nickel mesh and aluminum mesh cannot make tiny pore structures, resulting in low contact efficiency between air and the filter surface. In addition, the cost of these substrate materials is relatively high, making it difficult to promote on a large scale.

[0005] To overcome the above shortcomings, there is an urgent need to develop a method for in-situ growth of nano-titanium dioxide materials on the surface of fabrics that are inexpensive, shape-controllable, and widely available. Summary of the Invention

[0006] This application innovatively develops a method for in-situ growth of nano-titanium dioxide on the surface of fabrics. Nano-titanium dioxide materials can be grown in situ on the surface of fabrics. The nanoparticles are firmly bonded, do not fall off, and have extremely high photocatalytic activity.

[0007] One objective of this application is to provide a method for in-situ growth of nano-titanium dioxide on the surface of fabric. This method utilizes the weavable properties of these fabrics to prepare filters with different structures, shapes, and specifications. While reducing the manufacturing cost of photocatalytic oxidation filters, it greatly increases the contact efficiency between air and the filter surface, significantly improving the performance. The fabrics after in-situ growth of nano-titanium dioxide can also be used to prepare various self-cleaning, sun-protective, deodorizing, and antibacterial clothing and household products, expanding the market application space and showing great potential.

[0008] To achieve the above objectives, this application adopts the following technical solution:

[0009] A method for in-situ growth of nano-titanium dioxide on the surface of a fabric includes the following steps:

[0010] Place the clean cloth in a hydrogen peroxide solution and heat it at 70 to 90 degrees Celsius for 2 to 3 hours.

[0011] Add copper acetate to the above solution, with the mass of copper acetate accounting for one ten-thousandth to one ten-thousandth of the solution mass fraction. After adding copper acetate, continue heating at 70 to 90 degrees Celsius for 1 hour, then remove the fabric and dry it.

[0012] The dried fabric is then immersed in a titanium acid solution at 40 to 50 degrees Celsius for 1 to 2 hours, and then the fabric that has been immersed in the titanium acid solution is removed.

[0013] The fabric soaked in the above-mentioned titanic acid solution is squeezed to obtain a titanic acid solution containing 50% to 80% titanic acid solution by mass fraction.

[0014] The extruded fabric containing titanic acid solution was heat-treated under sealed conditions to obtain a fabric material with in-situ grown nano-titanium dioxide on its surface.

[0015] As a preferred aspect of this application, the fabric includes one or a combination of cotton fabric, linen fabric, wool fabric, silk fabric, chemical fiber fabric, and blended fabric.

[0016] As a preferred aspect of this application, the fabric further includes one or a combination of man-made fibers, plant fibers, etc.; the man-made fibers are selected from one or a combination of polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyolefin fibers, polyvinyl acetal fibers, polyvinyl chloride fibers, and carbon fibers; the plant fibers are selected from one or a combination of cotton, flax, silk, and wool.

[0017] As a preferred aspect of this application, the primary particle size of the nano-titanium dioxide particles is less than 10 nanometers.

[0018] As a preferred aspect of this application, the primary particle size of the nano-titanium dioxide particles is less than 5 nanometers.

[0019] As a preferred aspect of this application, the nano-titanium dioxide is crystalline nanoparticles; the crystal phase of the crystalline nanoparticles is one of anatase phase, rutile phase, or a combination thereof.

[0020] As a preferred aspect of this application, the hydrogen peroxide aqueous solution contains hydrogen peroxide at a mass fraction of 0.5% to 3%.

[0021] As a preferred aspect of this application, the titanic acid solution is prepared by mixing and stirring hydrated titanium hydroxide with hydrogen peroxide aqueous solution to form an aqueous solution; the mass fraction of titanic acid in the titanic acid solution is from one-thousandth to five percent.

[0022] As a preferred aspect of this application, the sealing condition is to place a cloth containing a titanium acid solution with a mass fraction of 50% to 80% into a container of fixed volume and seal it; the container of fixed volume does not undergo volume change when heated.

[0023] As a preferred aspect of this application, the heat treatment method is selected from microwave heating, electric heating, and steam heating; the heat treatment temperature is 100 degrees Celsius to 200 degrees Celsius; and the heat treatment time is 2 hours to 24 hours.

[0024] This application discloses a method for in-situ growth of nano-titanium dioxide on the surface of fabric, which has the following technical and application advantages.

[0025] (1) Low temperature preparation: This technique is applicable to most fiber and fabric materials and does not damage the structure and color of the fiber or fabric.

[0026] (2) Nanoscale: The titanium dioxide particles obtained by this technique are nanoscale, with a particle size of less than 10 nanometers. They have good crystallinity and excellent photocatalytic activity, self-cleaning ability and ultraviolet absorption ability.

[0027] (3) In-situ growth: A special functional group is grafted onto the surface of materials such as fabrics and fibers, and the titanate compound is transformed into a dense nano titanium dioxide layer in situ by epitaxial growth.

[0028] (4) Strong bonding: In the titanium dioxide fiber composite material obtained by this technology, the nano titanium dioxide particles are firmly bonded to the fiber. After various treatments such as soaking, ultrasonic treatment in water, scraping, and washing, no nano titanium dioxide particles were found to fall off.

[0029] (5) Excellent performance: Rhodamine B dye was applied to the obtained fabric and dried. After being exposed to sunlight for half an hour, the color of Rhodamine B could be removed, which proved that it has excellent photocatalytic self-cleaning effect.

[0030] (6) Low price: The preparation process and raw materials such as cloth and fiber are inexpensive, safe, environmentally friendly and non-toxic.

[0031] (7) Broad market: It can be woven into photocatalytic filter mesh for water purification, indoor and vehicle air purifiers, fresh air systems, industrial TVOC exhaust gas treatment, etc.; it has strong load-bearing capacity, water resistance and ultrasonic resistance, etc., and can be woven into various self-cleaning, sun protection, deodorizing and sterilizing clothing and household products. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 An optical image of the product obtained in Example 1; from Figure 1 As can be seen, after nano-titanium dioxide was grown in situ on the surface of the fabric in Example 1, the color and shape did not change, and no wrinkles occurred, compared with the original untreated fabric.

[0034] Figure 2 The product obtained in Example 1 was adhered to the sample stage of a scanning electron microscope with conductive adhesive and observed at low magnification; from Figure 2 It can be seen that the morphology and structure of the fabric fibers in Example 1 remain intact and have not been damaged or altered.

[0035] Figure 3 The product obtained in Example 1 was adhered to the sample stage of a scanning electron microscope with conductive adhesive and observed at medium magnification; from Figure 3 As can be seen, the fabric fiber surface of Example 1 is uniformly distributed with nano-titanium dioxide material, and the nano-titanium dioxide particles are firmly bonded to the fiber and do not fall off.

[0036] Figure 4The product obtained in Example 1 was adhered to the sample stage of a scanning electron microscope using conductive adhesive, and the distribution map of titanium in the fiber was obtained by EDS energy dispersive spectroscopy. Figure 4 It can be seen that nano-titanium dioxide is grown in situ on the surface of the fabric fibers in Example 1.

[0037] Figure 5 The product obtained in Example 1 was adhered to the sample stage of a scanning electron microscope with conductive adhesive and observed at high magnification; from Figure 5 It can be seen that a layer of nano-titanium dioxide was grown in situ on the surface of the fabric fibers in Example 1. The nano-titanium dioxide particles have a particle size of less than 10 nanometers and an average particle size of about 5 to 6 nanometers.

[0038] Figure 6 XRD pattern of the fine fibers detached from the product obtained in Example 1; from Figure 6 It can be confirmed that the main crystal phase of the nano-titanium dioxide particles in Example 1 is anatase, with a small amount of rutile.

[0039] Figure 7 The images show the results of soaking and ultrasonic treatment of the fabrics obtained in Example 1, Comparative Example 1, and Comparative Example 2. Figure 7 The image above), and the result image after the soaking solution has been left to stand ( Figure 7 (See image below); From Figure 7 As can be seen, the nano-titanium dioxide in Example 1 is firmly bonded to the fabric and does not fall off. Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Example 1

[0043] First, 10 grams of cleaned chemical fiber fabric (polyester fabric) was immersed in 50 ml of a 1% hydrogen peroxide aqueous solution and then heated at 80°C for 2 hours. Next, 2.5 mg of copper acetate was added to the solution, and the solution was heated at 80°C for another hour. The polyester fabric was then removed and dried. Next, 50 ml of a 2% titanic acid aqueous solution was prepared, and the dried polyester fabric was immersed in it and heated to 50°C for 1 hour. The polyester fabric was then removed and extruded to obtain a polyester fabric containing 60% titanic acid solution. Finally, the extruded polyester fabric was placed in a sealed reactor and heated in a 150°C electric oven for 6 hours to obtain a polyester fabric product with in-situ grown nano-titanium dioxide.

[0044] In Example 1, the polyester fabric with in-situ grown nano-titanium dioxide on the surface still appears white, as... Figure 1 As shown, after in-situ growth of nano-titanium dioxide on the fabric surface, the color and shape remained unchanged compared to the original untreated fabric, and no wrinkles occurred. A small amount of polyester fabric obtained in Example 1 was cut and adhered to the sample stage of a scanning electron microscope with conductive adhesive for observation of the sample morphology under low voltage. Figure 2 As shown. From Figure 2 It can be seen that the morphology and structure of the fibers remain intact, without damage or alteration, and still possess textile flexibility. They can be woven into various self-cleaning, sun-protective, deodorizing, and antibacterial filters, clothing, and household goods. Further observation using a magnified scanning electron microscope, such as... Figure 3 As shown. From Figure 3 As can be seen, in the titanium dioxide fiber composite material obtained in Example 1, nano-titanium dioxide material is uniformly distributed on the fiber surface, and the nano-titanium dioxide particles are firmly bonded to the fiber and do not fall off. Furthermore, the titanium content on the surface of the in-situ grown nano-titanium dioxide polyester fabric fiber obtained in Example 1 was further determined by EDS spectroscopy under scanning electron microscopy. Figure 4 As shown. From Figure 4 As can be seen, titanium can be detected on the fiber surface and is relatively uniformly distributed, further demonstrating that this method can grow nano-titanium dioxide in situ on the surface of fabrics and fibers with high quality. Further observation using a magnified scanning electron microscope, such as... Figure 5 As shown. From Figure 5As can be seen, a layer of nano-titanium dioxide was grown in situ on the surface of the fabric fibers obtained in Example 1 (top figure). These titanium dioxide particles are nanoscale, densely and firmly bonded, with a particle size of less than 10 nanometers and an average particle size of approximately 5 to 6 nanometers (bottom figure). Furthermore, the fabric was ball-milled, and the detached fine fibers were confirmed by XRD that the main crystalline phase of the nano-titanium dioxide particles on the surface was anatase, containing a small amount of rutile. This material exhibits good crystallinity, as shown in the XRD test results. Figure 6 As shown. To further investigate the material's shedding properties, the fabric obtained in this embodiment underwent various treatments including soaking, ultrasonic immersion in water, scraping, and washing. Ultimately, no nano-titanium dioxide particles were found to detach from the solution. The test results are as follows. Figure 7 As shown; Figure 7 It can also be seen that in the products of Comparative Examples 1 and 2, the fabric and titanium dioxide are not firmly bonded and are prone to detachment, resulting in a large amount of titanium dioxide particles in the solution. Furthermore, when 10 grams of the nano-titanium dioxide fabric obtained in Example 1 was added to 50 ml of a 20 ppm Rhodamine B solution, under standard sunlight irradiation, Rhodamine B was completely photocatalytically decomposed and removed within 20 minutes, confirming that the material has excellent photocatalytic activity and can be applied in air purification, water treatment, antibacterial and bacteriostatic fields, showing broad application prospects.

[0045] In summary, the advantages of this invention are: (1) Low-temperature preparation: This technique is applicable to most fiber and fabric materials and does not damage the structure and color of the fiber or fabric. (2) Nanoscale: The titanium dioxide particles obtained by this technique are nanoscale, with a particle size of less than 10 nanometers. They have good crystallinity and excellent photocatalytic activity, self-cleaning ability and ultraviolet absorption ability. (3) In-situ growth: A special functional group is grafted onto the surface of fabric, fiber and other materials. The titanium dioxide compound is converted into a dense nano titanium dioxide layer in situ by epitaxial growth. (4) Strong bonding: In the titanium dioxide fiber composite material obtained by this technique, the nano titanium dioxide particles are firmly bonded to the fiber. After soaking, immersion in water for ultrasonic treatment, scraping, washing and other treatments, no nano titanium dioxide particles were found to fall off. (5) Excellent performance: Rhodamine B dye was dripped onto the obtained fabric. After drying, the color of Rhodamine B could be removed by irradiation under sunlight for half an hour, which proved that it has excellent photocatalytic self-cleaning effect. (6) Low price: The preparation process and raw materials such as fabrics and fibers are inexpensive, safe, environmentally friendly and non-toxic. (7) Broad market: It can be woven into photocatalytic filter mesh for water purification, indoor and vehicle air purifiers, fresh air systems, industrial TVOC exhaust gas treatment, etc.; it has strong load-bearing capacity, water resistance and ultrasonic resistance, and can be woven into various self-cleaning, sun protection, deodorizing and antibacterial clothing and household products.

[0046] Example 2

[0047] First, 10 grams of cleaned cotton fabric was immersed in 50 ml of a 1% hydrogen peroxide aqueous solution and then heated at 70°C for 2 hours. Next, 5 mg of copper acetate was added to the solution, and the solution was heated at 70°C for another hour. The cotton fabric was then removed and dried. Next, 50 ml of a 5% titanic acid aqueous solution was prepared, and the dried cotton fabric was immersed in it and heated to 40°C for 2 hours. The cotton fabric was then removed and squeezed to obtain a cotton fabric containing 50% titanic acid solution. Finally, the squeezed cotton fabric was placed in a sealed reactor and then heated in a 100°C electric oven for 24 hours to obtain a cotton fabric product with in-situ grown nano-titanium dioxide. The product of this example has essentially the same properties as the product of Example 1.

[0048] Example 3

[0049] First, 10 grams of cleaned linen fabric was immersed in 50 ml of a 0.5% hydrogen peroxide aqueous solution and then heated at 90°C for 1 hour. Next, 0.5 mg of copper acetate was added to the solution, and the solution was heated at 90°C for another hour. The linen fabric was then removed and dried. Next, 50 ml of a 0.1% titanic acid aqueous solution was prepared, and the dried linen fabric was immersed in it and heated to 45°C for 1 hour. The linen fabric was then removed and squeezed to obtain a linen fabric containing 80% titanic acid solution. Finally, the squeezed linen fabric was placed in a sealed reaction vessel and heated in a 160°C electric oven for 6 hours to obtain a linen fabric product with in-situ grown nano-titanium dioxide. The product of this example has essentially the same properties as the product of Example 1.

[0050] Example 4

[0051] First, 10 grams of cleaned carbon fiber cloth was immersed in 50 ml of a 3% hydrogen peroxide aqueous solution and then heated at 75°C for 1 hour. Next, 1 mg of copper acetate was added to the solution, and the solution was heated at 75°C for another hour. The carbon fiber cloth was then removed and dried. Next, 50 ml of a 0.5% titanic acid aqueous solution was prepared, and the dried carbon fiber cloth was immersed in it and heated to 45°C for 2 hours. The carbon fiber cloth was then removed and extruded to obtain a carbon fiber cloth containing 70% titanic acid solution. Finally, the extruded carbon fiber cloth was placed in a sealed reactor and heated in a 200°C electric oven for 2 hours to obtain a carbon fiber cloth product with in-situ grown nano-titanium dioxide. The product of this example has essentially the same properties as the product of Example 1.

[0052] Example 5

[0053] First, 10 grams of cleaned chemical fiber fabric (polyamide fabric) was immersed in 50 ml of a 2% hydrogen peroxide aqueous solution and then heated at 85°C for 1 hour. Next, 3 mg of copper acetate was added to the solution, and the solution was heated at 85°C for another hour. The polyamide fabric was then removed and dried. Next, 50 ml of a 3% titanic acid aqueous solution was prepared, and the dried polyamide fabric was immersed in it and heated to 45°C for 2 hours. The polyamide fabric was then removed and extruded to obtain a polyamide fabric containing 65% titanic acid solution. Finally, the extruded polyamide fabric was placed in a sealed reactor and heated in a 160°C electric oven for 10 hours to obtain a polyamide fabric product with in-situ grown nano-titanium dioxide. The product of this example has essentially the same properties as the product of Example 1.

[0054] Example 6

[0055] First, 10 grams of cleaned wool fabric was immersed in 50 ml of a 1.5% hydrogen peroxide aqueous solution and then heated at 85°C for 1 hour. Next, 4 mg of copper acetate was added to the solution, and the solution was heated at 85°C for another hour. The wool fabric was then removed and dried. Next, 50 ml of a 2% titanic acid aqueous solution was prepared, and the dried wool fabric was immersed in it and heated to 45°C for 2 hours. The wool fabric was then removed and squeezed to obtain wool fabric containing 60% titanic acid solution. Finally, the squeezed wool fabric was placed in a sealed reactor and heated in a 130°C electric oven for 15 hours to obtain a wool fabric product with in-situ grown nano-titanium dioxide. The product of this example has essentially the same properties as the product of Example 1.

[0056] Example 7

[0057] First, 10 grams of cleaned polyester fiber was immersed in 50 ml of a 1.5% hydrogen peroxide aqueous solution and then heated at 70°C for 2 hours. Next, 3 mg of copper acetate was added to the solution, and the solution was heated at 70°C for another hour. The polyester fiber was then removed and dried. Next, 50 ml of a 1% titanic acid aqueous solution was prepared, and the dried polyester fiber was immersed in it and heated to 50°C for 1 hour. The polyester fiber was then removed and extruded to obtain polyester fiber containing 50% titanic acid solution. Finally, the extruded polyester fiber was placed in a sealed reactor and heated in a 140°C electric oven for 8 hours to obtain a polyester fiber product with in-situ grown nano-titanium dioxide.

[0058] Example 8

[0059] First, 10 grams of cleaned cotton fibers were immersed in 50 ml of a 3% hydrogen peroxide aqueous solution and then heated at 75°C for 2 hours. Next, 5 mg of copper acetate was added to the solution, and the solution was heated at 75°C for another hour. The cotton fibers were then removed and dried. Next, 50 ml of a 1% titanic acid aqueous solution was prepared, and the dried cotton fibers were immersed in it and heated to 45°C for 1 hour. The cotton fibers were then removed and extruded to obtain cotton fibers containing 70% titanic acid solution. Finally, the extruded cotton fibers were placed in a sealed reactor and heated in a 160°C electric oven for 5 hours to obtain cotton fiber products with in-situ grown nano-titanium dioxide.

[0060] Comparative Example 1

[0061] First, 10 grams of cleaned chemical fiber fabric (polyester fabric) was immersed in 50 ml of a 1% hydrogen peroxide aqueous solution and then heated at 80°C for 3 hours. The polyester fabric was then removed and dried. Next, 50 ml of a 2% titanic acid aqueous solution was prepared, and the dried polyester fabric was immersed in it and heated to 50°C for 1 hour. The polyester fabric was then removed and extruded to obtain a polyester fabric containing 60% titanic acid solution. Finally, the extruded polyester fabric was placed in a sealed reaction vessel and then heated in a 150°C electric oven for 6 hours to obtain the comparative product. In Comparative Example 1, due to the absence of copper ions, a large amount of titanic acid was not converted into nano-titanium dioxide, causing the fiber to turn yellow. The nano-titanium dioxide particles in the product were large and unevenly distributed, resulting in weak contact with the fiber and easy detachment. The nano-titanium dioxide was in the anatase phase and exhibited extremely low photocatalytic activity.

[0062] Comparative Example 2

[0063] First, 10 grams of cleaned chemical fiber fabric (polyester fabric) was immersed in 50 ml of a 1% hydrogen peroxide aqueous solution and then heated at 80°C for 2 hours. Next, 2.5 mg of copper acetate was added to the solution, and the solution was heated at 80°C for another hour. The polyester fabric was then removed and dried. Next, 50 ml of a 2% titanic acid aqueous solution was prepared, and the dried polyester fabric was immersed in it and heated to 50°C for 1 hour. The solution containing the polyester fabric was then placed directly into a reaction vessel, sealed, and heated in a 150°C electric oven for 6 hours to obtain the comparative product. In Comparative Example 2, titanium dioxide and fibers could not form a good composite material, mainly because the nano-titanium dioxide particles were generated in the solution through "nucleation growth," failing to effectively bind with the fibers and easily detaching. Furthermore, the nano-titanium dioxide particles obtained by this method were larger than 20 nanometers in size and exhibited extremely low photocatalytic activity.

[0064] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0065] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0066] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A method for in-situ growth of nanosized titanium dioxide on the surface of cloth, characterized in that, The method comprises the following steps: putting the cloth into a hydrogen peroxide solution and heating at 70-90℃ for 2-3 hours; adding copper acetate into the solution, the mass fraction of copper acetate is 0.01-0.1‰, and heating at 70-90℃ for 1 hour after adding copper acetate, then taking out and drying the cloth; immersing the dried cloth into a titanium acid solution, soaking at 40-50℃ for 1-2 hours, then taking out the cloth soaked in the titanium acid solution; the titanium acid solution is prepared by mixing and stirring titanium hydroxide and hydrogen peroxide solution, and the mass fraction of titanium acid in the solution is 0.001-5%; extruding the cloth soaked in the titanium acid solution to obtain a cloth containing titanium acid solution with a mass fraction of 50-80%; heat treating the cloth containing titanium acid solution under sealed conditions to obtain a cloth material with nano-titanium dioxide grown in situ on the surface.

2. The method for in-situ growth of nano-titania on the surface of cloth according to claim 1, characterized in that: The cloth comprises one or a combination of cotton cloth, linen cloth, wool cloth and silk cloth.

3. The method for in-situ growth of nano-titania on the surface of cloth according to claim 1, characterized in that: The cloth further comprises one or a combination of artificial fiber and plant fiber; the artificial fiber is selected from one or a combination of polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyolefin fiber, polyvinyl acetal fiber, polyvinyl chloride fiber and carbon fiber; the plant fiber is selected from one or a combination of cotton, flax, silk and wool.

4. The method for in-situ growth of nano-titania on the surface of cloth according to claim 1, characterized in that: The primary particle size of the nano-titanium dioxide particles is less than 10 nm.

5. The method for in-situ growth of nanosized titanium dioxide on the surface of cloth according to claim 1, characterized in that: The primary particle size of the nano-titanium dioxide particles is less than 5 nm.

6. The method for in-situ growth of nanosized titanium dioxide on the surface of cloth according to claim 1, characterized in that: The nano-titanium dioxide is a crystalline nanoparticle; the crystal phase of the crystalline nanoparticle is one or a combination of anatase phase and rutile phase.

7. The method for in-situ growth of nanosized titanium dioxide on the surface of cloth according to claim 1, characterized in that: The mass fraction of hydrogen peroxide in the hydrogen peroxide solution is 0.05-3‰.

8. The method for in-situ growth of nanosized titanium dioxide on the surface of cloth according to claim 1, characterized in that: The sealed condition is to put the cloth containing titanium acid solution with a mass fraction of 50-80% into a fixed-volume container; the fixed-volume container does not change in volume under heating.

9. The method for growing nanosized titanium dioxide on the surface of cloth in situ as claimed in claim 1, wherein: The heat treatment is selected from one of microwave heating, electric heating and water vapor heating; the temperature of the heat treatment is 100-200℃; the time of the heat treatment is 2-24 hours.

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