Super-hydrophobic fabric with photocatalysis and oil-water separation performance as well as preparation method and application of super-hydrophobic fabric

Abstract

The invention discloses a super-hydrophobic fabric with photocatalysis and oil-water separation performance and a preparation method and application thereof.The preparation method comprises the following steps that polyester fabric is soaked in an aqueous solution of an organic solvent, and a structural reagent is added for hydrolytic condensation; the silicon-titanium hybrid nanowires grow on the surface of the polyester fabric in situ, and the super-hydrophobic fabric is obtained. Wherein the structural reagent is a titanium precursor and alkyl chlorosilane and / or alkyl siloxane. The preparation method disclosed by the invention is simple to operate and mild in reaction condition, in-situ growth of the silicon-titanium hybrid nanowires can be realized without introducing an acid or alkali catalyst, the contact angle between the prepared super-hydrophobic fabric and water is greater than 155 degrees, the rolling angle is as low as 5 degrees, the oil-water separation efficiency is 99% or above, the maximum oil flux can reach 41358L / (m < 2 >. H), and the prepared super-hydrophobic fabric has good application prospects. And the photocatalyst has good photocatalytic self-cleaning performance and can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and more specifically to a super-hydrophobic fabric with photocatalytic and oil-water separation properties, and a preparation method and application thereof. Background Art

[0002] The random discharge of industrial wastewater has created a major ecological risk and threatened human health, while oil spills at sea have caused serious environmental pollution and energy losses. Although traditional wastewater treatment methods such as physical adsorption, chemical degradation, in-situ combustion, and gravity separation are suitable for oil-water separation, they have the problems of complex processes, bulky equipment, high costs, relatively low separation efficiency, and even secondary pollution. Therefore, it is extremely important to develop a functional material with a simple preparation method that can efficiently and sustainably separate oil from water.

[0003] Superhydrophobic porous materials have attracted much attention in the field of oil-water separation due to their unique wettability. The preparation of superhydrophobic materials is the result of the synergistic effect of micro-nanoscale rough structures and low surface energy materials. This type of material has the following technical problems: the preparation process is expensive, requiring specialized equipment and high cost, such as photolithography, reactive ion etching, vapor deposition, nanoimprinting and electrospinning; fluorine-containing substances are often used to modify them, reducing surface energy and threatening ecological health; the preparation process is complicated, and the construction and surface modification of the rough surface are mostly carried out in steps; the actual application value of the product is small, and the micro-nano rough structure and the base material are rarely connected by chemical bonds, resulting in poor stability. In addition, non-volatile oils and organic pollutants will contaminate superhydrophobic materials during the separation process, affecting their surface properties and recyclability.

[0004] Therefore, developing a self-cleaning material with simple preparation method, stable performance, and capable of high-throughput and high-efficiency oil-water separation is a huge challenge currently faced. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a super-hydrophobic fabric with photocatalytic and oil-water separation properties and a preparation method and application thereof. The preparation method is simple to operate and low in cost. The super-hydrophobic fabric with integrated photocatalytic function has high stability, high oil-water separation efficiency, high oil flux, and good light self-cleaning performance.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A method for preparing a super-hydrophobic fabric with photocatalytic and oil-water separation properties comprises the following steps: immersing a polyester fabric in an aqueous solution of an organic solvent, and adding a structural agent for hydrolysis and condensation to generate silicon-titanium hybrid nanowires and in-situ growing them on the surface of the polyester fabric to obtain the super-hydrophobic fabric; wherein the structural agent is a titanium precursor and alkylchlorosilane and / or alkylsiloxane.

[0008] Optionally, the silicon-titanium hybrid nanowire has a diameter of 40 nm to 80 nm and a length of ≥500 nm.

[0009] Optionally, the length of the alkyl chain in the alkylchlorosilane and the alkylsiloxane is 1-18 carbon atoms, respectively.

[0010] Optionally, the alkyl chains in the alkylchlorosilane and the alkylsiloxane include one of methyl, ethyl, propyl, hexyl, octyl, nonyl, decyl, dodecyl, hexadecyl and octadecyl.

[0011] Optionally, the alkylchlorosilane and the alkylsiloxane are one or more of trichlorosilane, trimethoxysilane, triethoxysilane, triisopropoxysilane, tri-n-propoxysilane, tri-n-butoxysilane and triacetoxysilane with 1 to 18 carbon atoms.

[0012] Optionally, the titanium precursor has 4 functionalities.

[0013] Optionally, the titanium precursor includes one or more of tetra-n-butyl titanate, tetra-isobutyl titanate, titanium isopropoxide and titanium n-propoxide.

[0014] Optionally, the volume ratio of the alkylchlorosilane and / or the alkylsiloxane to the titanium precursor is 80:(1-20). Preferably, the volume ratio of the alkylchlorosilane and / or the alkylsiloxane to the titanium precursor is 80:(1-10)

[0015] Optionally, the volume ratio of the structural reagent to the organic solvent is (81ul-100ul):85ml. Preferably, the volume ratio of the structural reagent to the organic solvent is (81ul-90ul):85ml.

[0016] Optionally, the volume ratio of the organic solvent to the area ratio of the polyester fabric is 85 ml:(10 cm 2 ~40cm 2 ). Preferably, the volume ratio of the organic solvent to the area ratio of the polyester fabric is 85 ml:20 cm 2 .

[0017] Optionally, the concentration of water in the aqueous solution of the organic solvent is 50ppm to 500ppm. Preferably, the concentration is 100ppm to 200ppm.

[0018] Optionally, the organic solvent includes one or more of toluene, chlorobenzene, p-xylene, n-butylbenzene, chloroform, acetone, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-hexadecane, dichloromethane, 1,2-dichloroethane and 1,1,2,2-tetrachloroethane.

[0019] Optionally, the preparation of the aqueous solution of the organic solvent comprises the following steps:

[0020] (1) Prepare a first solution with a concentration of 250 ppm to 300 ppm, seal and let stand.

[0021] (2) adding molecular sieves to the organic solvent, sealing and allowing to stand for more than 12 hours to obtain a second solution with a concentration of 5 ppm to 10 ppm.

[0022] (3) The first solution and the second solution are mixed in a volume ratio of 3:14 to 16:1, preferably 8:9 to 12:5 to obtain an aqueous solution of the organic solvent.

[0023] Optionally, the immersion time is 0 min to 60 min, preferably 15 min to 45 min; the immersion temperature is 10°C to 40°C, preferably 20°C to 30°C.

[0024] Optionally, the hydrolysis condensation time is 1 h to 24 h, preferably 6 h to 12 h; the hydrolysis condensation temperature is 10°C to 40°C, preferably 20°C to 30°C.

[0025] Optionally, before the polyester fabric is immersed in the aqueous solution of the organic solvent, the polyester fabric needs to be pretreated, specifically comprising the following steps: ultrasonically cleaning the polyester fabric in ethanol for 1 to 5 times, each time for 5 minutes to 20 minutes, and drying at 30° C. to 60° C. for 10 minutes to 60 minutes after cleaning. Preferably, the ultrasonic cleaning is performed 3 times, each time for 15 minutes, and drying is performed at 40° C. for 30 minutes after cleaning.

[0026] Optionally, the preparation method further comprises: soaking the super-hydrophobic fabric with silicon-titanium hybrid nanowires in situ grown on the surface in a n-hexane solvent for 5 to 60 minutes, and then naturally drying it at 10°C to 40°C for 5 to 60 minutes. Preferably, soaking the super-hydrophobic fabric with silicon-titanium hybrid nanowires in situ grown on the surface in a n-hexane solvent for 10 to 20 minutes, and then naturally drying it at 20°C to 30°C for 15 to 30 minutes.

[0027] The invention also discloses a super hydrophobic fabric with photocatalysis and oil-water separation performances prepared by the above-mentioned preparation method.

[0028] The present invention also discloses a super-hydrophobic fabric with photocatalytic and oil-water separation performance prepared by the above-mentioned preparation method, or the application of the super-hydrophobic fabric with photocatalytic and oil-water separation performance in high-throughput oil-water separation.

[0029] Optionally, the oil is household oil such as kerosene, soybean oil, and common solvent oils such as toluene, n-hexane, and dichloromethane, and their mixtures with water have good separation effects, wherein the lower the viscosity of the oil, the faster the separation speed, that is, the greater the flux.

[0030] Optionally, the application method includes: placing the prepared super-hydrophobic fabric with photocatalytic and oil-water separation properties at a specific position of an oil-water separation device, and achieving separation through contact between the oil-water mixture and the super-hydrophobic fabric with photocatalytic and oil-water separation properties; wherein the oil-water separation device is gravity-driven.

[0031] The simplicity, cost-efficiency and high throughput of the preparation method of the present invention make it a practical method for imparting superhydrophobicity to various substrates and devices, providing new possibilities for the construction of superhydrophobic surfaces.

[0032] The present invention utilizes the controllable hydrolysis and condensation reaction of alkylchlorosilane and / or alkylsiloxane and titanium precursor in an organic solvent with a certain water content to realize the in-situ growth of silicon-titanium hybrid nanowires on the surface of polyester fabric, simplifies the preparation of super-hydrophobic fabrics with integrated photocatalytic function, and is used for oil-water separation. The obtained super-hydrophobic fabric with photocatalytic and oil-water separation properties has high oil-water separation efficiency, oil flux and light-driven self-cleaning performance, and has broad application prospects in petroleum pollution treatment, self-cleaning surface and desalination.

[0033] Implementing the embodiments of the present invention will have the following beneficial effects:

[0034] 1. The preparation process of the present invention is simple. Silicon-titanium hybrid nanowires are prepared by controlled hydrolysis and condensation reaction of alkylchlorosilane and / or alkylsiloxane and titanium precursor in an organic solvent containing a small amount of water. Super-hydrophobic fabrics with photocatalytic and oil-water separation properties can be obtained by immersing polyester fabrics in corresponding organic solvents in advance. No additional curing agent, adhesive or other structural template components are required. The reaction system is simple, the solvent impurities are less after the reaction, and recycling can be achieved through simple operations such as filtration, thereby meeting the requirements of economy and environmental protection.

[0035] 2. The preparation conditions of the present invention are mild. At room temperature, the preparation of super-hydrophobic fabrics with photocatalytic and oil-water separation properties can be achieved by simple stirring and dipping, without relying on complex production equipment. The prepared super-hydrophobic fabrics can be directly transferred and separated from the system, and can be used for oil-water separation after washing and drying.

[0036] 3. The silicon-titanium hybrid nanowires prepared by the present invention have a large aspect ratio and an irregular morphology, and are easy to form a rough multi-level structure on the surface of polyester fabrics. At the same time, the alkyl chains in the structural reagent give the nanowires low surface energy, so that the coated fabrics constructed based on silicon-titanium hybrid nanowires have ideal superhydrophobic properties; in addition, the doping of titanium oxide gives the fabric photocatalytic activity, which can successfully degrade organic pollutants on the surface.

[0037] 4. The super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared by the present invention has excellent super-hydrophobic and oil-water separation properties, the water contact angle is greater than 155°, and the oil flux can reach up to 41358L / (m 2 h), the separation efficiency is as high as over 99%, and it can be recycled many times with stable performance.

[0038] 5. The super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared by the present invention has good photocatalytic self-cleaning properties, and light can effectively degrade organic pollutants on the surface to achieve recycling and reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a SEM image of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention.

[0040] Figure 2 This is a physical picture of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention contacting water droplets and oil droplets.

[0041] Figure 3 This is a picture of the water contact angle of the superhydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention.

[0042] Figure 4 This is a bar graph of the oil-water separation efficiency of the superhydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention for various oil-water mixtures.

[0043] Figure 5 This is a bar graph of the oil flux of the superhydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention.

[0044] Figure 6 The UV-visible spectra of the original Rhodamine B solution, the original Rhodamine B solution after irradiation for 9 hours, and the Rhodamine B solution containing the superhydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention after irradiation for 9 hours.

[0045] Figure 7 This is a contact angle photograph of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Example 1 of the present invention after being illuminated for 9 hours.

[0046] Figure 8 This is a SEM picture of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Comparative Example 1 of the present invention.

[0047] Fig. 9 This is a SEM picture of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Comparative Example 2 of the present invention.

[0048] Fig.10 This is a SEM picture of the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared in Comparative Example 3 of the present invention. DETAILED DESCRIPTION

[0049] The present invention is further described below in conjunction with specific embodiments, but the present invention is not limited in any way.

[0050] Example 1

[0051] The preparation method of the super-hydrophobic fabric with photocatalytic and oil-water separation performance of this embodiment comprises the following steps:

[0052] (1) The polyester fabric was ultrasonically cleaned in ethanol for 3 times, each time for 15 min, and then dried at 40 °C for 0.5 h.

[0053] (2) Add 2 ml of water to 800 ml of toluene, ultrasonicate for 20 min, stir at 1000 rpm for 12 h to obtain a 278 ppm toluene aqueous solution, and seal the solution and let it stand.

[0054] (3) Add 200 cm 3 The activated molecular sieve was sealed and allowed to stand for more than 12 hours to obtain a 7 ppm toluene aqueous solution.

[0055] (4) Take 50 ml of a 278 ppm toluene aqueous solution and 35 ml of a 7 ppm toluene aqueous solution, stir at 500 rpm for 5 min, and obtain 85 ml of a 166 ppm toluene aqueous solution.

[0056] (5) Cut the pretreated polyester fabric into 4 cm 2 ×5cm 2 The size of the particle was suspended in the toluene aqueous solution obtained in step (4) and immersed for 0.5 h at 500 rpm.

[0057] (6) 80ul of methyltrichlorosilane (99%) and 6ul of tetrabutyl titanate (98%) (molar ratio of 39:1) were added to the reaction system, the stirring speed was adjusted to 250rpm, and the stirring was maintained for 12h to obtain a wet superhydrophobic fabric with photocatalytic and oil-water separation properties.

[0058] (7) The wet super-hydrophobic fabric with photocatalytic and oil-water separation properties was completely immersed in n-hexane solvent for 15 minutes, and then naturally dried at room temperature for 15 minutes to obtain a super-hydrophobic fabric with integrated photocatalytic function that can be used for high-throughput oil-water separation.

[0059] Figure 1 This is the SEM picture of the super-hydrophobic fabric prepared in Example 1 of the present invention. It can be seen that each polyester fiber is completely covered with silicon-titanium hybrid nanowires with a diameter of about 15 μm. The diameter of the silicon-titanium hybrid nanowires is 40 nm to 80 nm, and the length is more than 500 nm. The nanowires are curved, and the surface of the nanowires has a nanoscale protrusion structure.

[0060] Figure 2 This is a real picture of the super-hydrophobic fabric prepared in Example 1 of the present invention contacting water droplets and oil droplets. The water droplets always maintain a spherical shape when contacting the nanowire coated fabric, and the oil droplets quickly infiltrate the fabric. The results show that the super-hydrophobic fabric with photocatalytic and oil-water separation properties prepared by the present invention has good hydrophobic and oleophilic effects.

[0061] Figure 3 This is a water contact angle diagram of the super-hydrophobic fabric prepared in Example 1 of the present invention. The results show that the surface water contact angle of the fabric can reach more than 155°, and the contact angle testing method is: using a video optical contact angle meter (Germany Dataphysics company, instrument model: OCA50), a 4ul water droplet placed on the surface of the super-hydrophobic fabric with integrated photocatalytic function is tested for contact angle, five positions on the fabric surface are randomly tested, and the average value is taken as the test result of the contact angle data.

[0062] Figure 4 The oil-water separation efficiency bar graph of the hydrophobic fabric prepared in Example 1 of the present invention for various oil-water mixtures, the separation efficiency is above 99%. Separation efficiency test method: select n-hexane, n-heptane, n-decane, cyclohexane, kerosene, toluene, 1,2-dichloroethane, dichloromethane and water as test liquids. Oil-water separation is carried out by gravity drive, and two different separation devices are used to separate the mixture of heavy oil and water and light oil and water respectively. The super-hydrophobic fabric is fixed at the channel connecting the outside world and the inside of the device, so that the oil flows to the outside world through the super-hydrophobic fabric to achieve separation.

[0063] Separation efficiency (E sep , %) is calculated as follows:

[0064]

[0065] Where m is the initial mass of oil, m0 and m1 are the masses of water before and after separation, respectively.

[0066] Figure 5The oil flux bar graph of the super hydrophobic fabric prepared in Example 1 of the present invention is as high as 41358 L / (m 2 h), oil flux test device and test oil Figure 6 Consistent.

[0067] Oil flux (J,L / (m 2 h)) is calculated as follows:

[0068]

[0069] Where V(L) is the volume of the penetrating oil, S(m 2 ) is the effective area of ​​the superhydrophobic fabric, and t(h) is the penetration time of oil.

[0070] Figure 6 The UV-visible spectra of the super hydrophobic fabric prepared in Example 1 of the present invention under different illumination times are shown in Figure 1. By comparing different absorption curves, it can be seen that Rhodamine B is successfully degraded due to illumination. UV-visible spectrum test method: 4 pieces of super hydrophobic fabric (2 cm × 2 cm) are immersed in 25 mL of RhB solution (1.0 × 10 -2 mM), 50uL ethanol was added to reduce the surface tension and wet the super-hydrophobic fabric. Then, an LED lamp with a wavelength of 465nm (Shenzhen Guanghua Technology Co., Ltd.) was used at 16.50±1.50mW / cm 2 The sample was irradiated with a light power density of 100 nm. After irradiation for 9 h, 1 mL of the solution was taken out and the UV-visible spectrum was measured. At the same time, 25 mL of RhB solution (1.0×10 -2 mM) UV-visible spectra of 0h and 9h of illumination under the same conditions were used as comparison.

[0071] Figure 7 This is a contact angle photograph of the super hydrophobic fabric prepared in Example 1 of the present invention after 9 hours of illumination. The results show that the water contact angle on the surface of the super hydrophobic fabric after illumination can reach 153°, that is, illumination does not destroy the super hydrophobic property of the fabric. The contact angle test method is the same as Figure 3 .

[0072] Comparative Example 1

[0073] The only difference between this comparative example and Example 1 is that the ratio of methyltrichlorosilane to tetrabutyl titanate is 80ul:1ul.

[0074] Figure 8 This is a SEM picture of the super-hydrophobic fabric prepared in Comparative Example 1 of the present invention. It can be seen that when the addition amount of tetrabutyl titanate is too low, the nanowires grow too densely and connect the single polyester fibers, which will have an adverse effect on the oil flux.

[0075] Comparative Example 2

[0076] The only difference between this comparative example and Example 1 is that the ratio of methyltrichlorosilane to tetrabutyl titanate is 80ul:3ul.

[0077] Fig. 9 This is a SEM picture of the super-hydrophobic fabric prepared in Comparative Example 2 of the present invention. The silicon-titanium hybrid nanowires grew in situ without affecting the original morphology of the polyester fabric, but the amount of tetrabutyl titanate added was low, which affected the photocatalytic self-cleaning effect.

[0078] Comparative Example 3

[0079] The only difference between this comparative example and Example 1 is that the ratio of methyltrichlorosilane to tetrabutyl titanate is 80ul:9ul.

[0080] Fig.10 This is a SEM picture of the super-hydrophobic fabric prepared in Comparative Example 3 of the present invention. Although the titanium content in the nanowires is increased, too much tetrabutyl titanate will affect the hydrolysis and condensation of methyltrichlorosilane, resulting in uneven growth of the hybrid nanowires on the fabric surface.

[0081] Example 2

[0082] The difference from Example 1 is that according to the preparation method of Example 1, the volume of 278 ppm toluene aqueous solution in step (4) is replaced by 80 ml, and the volume of 7 ppm toluene aqueous solution is replaced by 5 ml, and the toluene water content is adjusted to 262 ppm.

[0083] The effect of the photocatalytic function integrated super-hydrophobic fabric prepared in Example 2 is the same as that in Example 1.

[0084] Example 3

[0085] The difference from Example 1 is that according to the preparation method of Example 1, toluene in steps (2), (3), (4) and (5) is replaced by chlorobenzene.

[0086] The effect of the photocatalytic function integrated super-hydrophobic fabric prepared in Example 3 is the same as that in Example 1.

[0087] Example 4

[0088] The difference from Example 1 is that according to the preparation method of Example 1, tetrabutyl titanate in step (6) is replaced by titanium isopropoxide.

[0089] The effect of the photocatalytic function integrated super-hydrophobic fabric prepared in Example 4 is the same as that in Example 1.

[0090] Example 5

[0091] The difference from Example 1 is that according to the preparation method of Example 1, methyltrichlorosilane in step (6) is replaced by methyltrimethoxysilane.

[0092] The effect of the photocatalytic function integrated super-hydrophobic fabric prepared in Example 5 is the same as that in Example 1.

[0093] In summary, the preparation method of the present invention is simple to operate, has mild reaction conditions, and can achieve in-situ growth of silicon-titanium hybrid nanowires without the introduction of acid or base catalysts. The prepared super-hydrophobic fabric has a contact angle with water greater than 155°, a rolling angle as low as 5°, an oil-water separation efficiency of more than 99%, and an oil flux of up to 41358 L / (m 2 ·h), and has good photocatalytic self-cleaning performance and can be recycled.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a super-hydrophobic fabric having photocatalytic and oil-water separation properties, characterized in that: The following steps are involved: The polyester fabric is immersed in an aqueous solution of an organic solvent, and a structural agent is added for hydrolysis and condensation to generate silicon-titanium hybrid nanowires and in-situ grow them on the surface of the polyester fabric to obtain the superhydrophobic fabric; wherein the structural agent is a titanium precursor and alkylchlorosilane and / or alkylsiloxane.

2. The preparation method according to claim 1, characterized in that: The diameter of the silicon-titanium hybrid nanowire is 40nm-80nm, and the length is ≥500nm.

3. The preparation method according to claim 1, characterized in that: The length of the alkyl chain in the alkylchlorosilane and the alkylsiloxane is 1-18 carbons respectively; The titanium precursor has four functionalities.

4. The preparation method according to claim 3, characterized in that: The alkyl chains in the alkylchlorosilane and the alkylsiloxane include one of methyl, ethyl, propyl, hexyl, octyl, nonyl, decyl, dodecyl, hexadecyl and octadecyl; The titanium precursor includes one or more of tetra-n-butyl titanate, tetra-isobutyl titanate, titanium isopropoxide and titanium n-propoxide.

5. The preparation method according to claim 3, characterized in that: The alkylchlorosilane and the alkylsiloxane are one or more of trichlorosilane, trimethoxysilane, triethoxysilane, triisopropoxysilane, tri-n-propoxysilane, tri-n-butoxysilane and triacetoxysilane with 1 to 18 carbon atoms.

6. The preparation method according to claim 1, characterized in that: The volume ratio of the alkylchlorosilane and / or the alkylsiloxane to the titanium precursor is 80:(1-20); The volume ratio of the structural reagent to the organic solvent is (81ul-100ul):85ml; The volume ratio of the organic solvent to the area of ​​the polyester fabric is 85 ml: (10 cm 2 ~40cm 2 ).

7. The preparation method according to claim 1, characterized in that: The water concentration in the aqueous solution of the organic solvent is 50ppm to 500ppm; the organic solvent includes one or more of toluene, chlorobenzene, p-xylene, n-butylbenzene, chloroform, acetone, n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-hexadecane, dichloromethane, 1,2-dichloroethane and 1,1,2,2-tetrachloroethane.

8. The preparation method according to claim 1, characterized in that: The immersion time is 0 min to 60 min; the immersion temperature is 10° C. to 40° C.; The time of the hydrolysis condensation is 1 hour to 24 hours; the temperature of the hydrolysis condensation is 10° C. to 40° C.

9. A super hydrophobic fabric having photocatalytic and oil-water separation properties prepared by the preparation method according to any one of claims 1 to 8.

10. A super hydrophobic fabric with photocatalytic and oil-water separation properties prepared by the preparation method according to any one of claims 1 to 8, or use of the super hydrophobic fabric with photocatalytic and oil-water separation properties according to claim 9 in high-throughput oil-water separation.

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