A recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material and preparation method thereof

Abstract

The present invention provides a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material and a preparation method thereof, and belongs to the field of photocatalytic technology. The present invention first mixes nano-carbon powder, anhydrous ethanol, and glacial acetic acid, then adds an organic titanium source and an oxide quantum dot aqueous solution, and then ages and dries to obtain a nano-carbon / titanium oxide precursor dry gel; then disperses an adhesive and an organic polymer in water to obtain an adhesive liquid; disperses the nano-carbon / titanium oxide precursor dry gel in the adhesive liquid to obtain a nano-carbon / titanium oxide adhesive mixed liquid; finally, the nano-carbon / titanium oxide adhesive mixed liquid is sprayed on the surface of a porous matrix material, and a recyclable nano-carbon / titanium oxide water treatment photocatalytic material can be obtained by drying and calcining. The present invention constructs a narrow-band oxide quantum dot-nano-carbon / titanium oxide-based material, and uses it as a raw material to prepare a nano-carbon / titanium dioxide water treatment photocatalytic material that is easy to recycle and has high catalytic activity.

Description

Technical Field

[0001] The invention relates to the technical field of photocatalysis, and in particular to a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material and a preparation method thereof. Background Art

[0002] Developing new, efficient and environmentally friendly sewage treatment technologies is one of the cutting-edge technologies that promote social development. Although traditional sewage treatment technologies have played a great role in protecting the ecological environment of water bodies and treating sewage, there are some problems to varying degrees in treating organically polluted water bodies. For example, traditional water treatment processes such as coagulation, filtration, and disinfection can remove suspended matter, turbidity, and chromaticity in sewage, but their ability to remove dissolved organic matter is relatively insufficient; biological treatment technology is powerless against some highly toxic artificial synthetic organic matter; physicochemical technologies (such as coprecipitation, adsorption, and extraction) and chemical oxidation technologies (such as ozone oxidation, chlorination, and incineration) have defects such as low removal efficiency, high operating costs, and secondary pollution.

[0003] Photocatalytic oxidation technology is an energy-saving, environmentally friendly sewage treatment technology with broad application prospects. Compared with traditional sewage treatment technologies such as biological methods and other advanced chemical oxidation methods, photocatalytic oxidation technology can not only directly utilize sunlight, but also completely oxidize organic pollutants into non-toxic small molecules such as H2O and CO2, gradually becoming a supplement and improvement to traditional water pollution control technologies. However, photocatalytic oxidation technology faces the problem of low photocatalyst efficiency. At present, through the development of new narrow-band materials (such as bismuth-based materials, transition metal sulfides, g-C3N4, Ag3PO4, etc.), or the modification of traditional catalyst materials (TiO2, ZnO), and by means of nano-sizing catalytic materials, photocatalytic materials with visible light response and high catalytic efficiency have been obtained.

[0004] In sewage treatment, photocatalytic oxidation technology still faces the problems of high price and difficult recycling. At present, the recycling of catalytic materials can be promoted by solidifying the catalytic materials (such as preparing them into spheres or porous films) and giving them special properties (such as magnetic properties). However, how to improve the catalytic efficiency and catalyst utilization rate after the catalytic materials are solidified, as well as the water stability of the catalytic materials, etc., still needs further research. Therefore, the development of efficient, water-resistant, and recyclable visible light catalytic materials has important theoretical significance and practical application value for promoting the practical application of photocatalytic oxidation technology. Summary of the invention

[0005] The purpose of the present invention is to provide a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material and a preparation method thereof, so as to solve the technical problems of low efficiency, poor water stability and difficult recycling of visible light catalytic materials in the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for preparing a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material, comprising the following steps:

[0008] (1) mixing nanocarbon powder, anhydrous ethanol, and glacial acetic acid, and then sequentially adding an organic titanium source and an oxide quantum dot aqueous solution to form a nanocarbon / titanium oxide sol; aging and drying the nanocarbon / titanium oxide sol in sequence to obtain a nanocarbon / titanium oxide precursor dry gel;

[0009] (2) dispersing an adhesive and an organic polymer in water to obtain an adhesive liquid; dispersing a nanocarbon / titanium oxide precursor dry gel in the adhesive liquid to obtain a nanocarbon / titanium oxide adhesive mixed liquid;

[0010] (3) The nanocarbon / titanium oxide adhesive mixture is sprayed onto the surface of the porous base material, and then dried and calcined in sequence to obtain a recyclable nanocarbon / titanium oxide water treatment photocatalytic material.

[0011] Furthermore, in step (1), the nano-carbon powder comprises one or more of graphene oxide, reduced graphene oxide and carbon nanotubes.

[0012] Furthermore, in step (1), the organic titanium source comprises one or more of butyl titanate, tetraethyl titanate, tetraisopropyl titanate and titanium isopropoxide.

[0013] Furthermore, in step (1), the oxide in the oxide quantum dot aqueous solution comprises one or more of tungsten oxide, bismuth oxide and iron oxide, wherein the concentration of the oxide quantum dot aqueous solution is 0.05-0.1 mg / mL.

[0014] Furthermore, in the step (1), the usage ratio of the nano-carbon powder, anhydrous ethanol, glacial acetic acid, organic titanium source and oxide quantum dot aqueous solution is 0.05-0.1 g: 50-100 mL: 2-6 mL: 5-20 mL: 20-50 mL.

[0015] Furthermore, in step (2), the adhesive is a silane coupling agent, aluminum dihydrogen phosphate or water glass; and the organic polymer is silicon polyvinyl pyrrolidone or ethyl cellulose or polyvinyl alcohol.

[0016] Furthermore, in the step (2), the usage ratio of the adhesive, the organic polymer, water, and the nanocarbon / titanium oxide precursor dry gel is 2-5 mL: 5-10 mg: 10-20 mL: 5-10 g.

[0017] Furthermore, in step (3), the porous matrix material comprises a porous alumina matrix material, a porous ceramic filler matrix material or a porous silica matrix material.

[0018] Furthermore, in the step (3), the drying temperature is 80-100° C., and the drying time is 8-12 hours; the calcination temperature is 350-550° C., and the calcination time is 1-3 hours.

[0019] The invention provides a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material.

[0020] Beneficial effects of the present invention:

[0021] (1) The nano-carbon material used in the present invention has its own structural stability, large specific surface area, good electrical conductivity and mechanical properties, can increase the specific surface area of ​​the titanium oxide catalyst, accelerate the migration of photogenerated carriers, hinder the recombination of photogenerated electron-hole pairs, and effectively improve the photocatalytic performance of titanium oxide; at the same time, the superior performance of narrow-band oxide quantum dots is utilized to construct a heterojunction to broaden the spectral response range and accelerate the separation of photogenerated electron-hole pairs, further improving the performance of the nano-carbon / titanium oxide water treatment photocatalytic material, and obtaining a nano-carbon / titanium oxide water treatment photocatalytic material with visible light response and high catalytic activity;

[0022] (2) The present invention uses a mixture of adhesive and organic polymer, and then removes the organic matter by calcination, and the adhesive is formed into an inorganic oxide, so that the nanocarbon / titanium oxide-based catalytic material is solidified on the surface of the porous material; at the same time, when the organic matter decomposes, a porous structure will be formed, which is conducive to the exposure of the nanocarbon / titanium oxide-based material, showing more surface active sites, and ultimately improving the utilization rate of the catalyst in the solidified material. In addition, the nanocarbon / titanium oxide water treatment photocatalytic material is solidified by an inorganic binder, and the structure is stable, which overcomes the shortcomings of poor thermal stability and easy aging of organic binders under light, and improves the anti-aging performance and water stability of the mixed solid material;

[0023] (3) The water treatment photocatalytic material prepared by the present invention has both photocatalytic performance and adsorption performance, which can realize the recycling of nano-carbon-based photocatalytic materials, is conducive to solving the bottleneck problem of photocatalytic materials in practical applications, and can be applied to environmental protection fields such as sewage treatment, photodegradation of water, and air purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the XRD pattern of the recyclable graphene oxide / titanium oxide water treatment photocatalytic material prepared in Example 1;

[0025] Figure 2 The photocatalytic performance of the recyclable reduced graphene oxide / titanium oxide water treatment photocatalytic material prepared in Example 2;

[0026] Figure 3 The photocatalytic performance of the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material obtained in Example 3 after use and calcination;

[0027] Figure 4 This is an optical photograph of the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material prepared in Example 4. DETAILED DESCRIPTION

[0028] The present invention provides a method for preparing a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material, comprising the following steps:

[0029] (1) mixing nanocarbon powder, anhydrous ethanol, and glacial acetic acid, and then sequentially adding an organic titanium source and an oxide quantum dot aqueous solution to form a nanocarbon / titanium oxide sol; aging and drying the nanocarbon / titanium oxide sol in sequence to obtain a nanocarbon / titanium oxide precursor dry gel;

[0030] (2) dispersing an adhesive and an organic polymer in water to obtain an adhesive liquid; dispersing a nanocarbon / titanium oxide precursor dry gel in the adhesive liquid to obtain a nanocarbon / titanium oxide adhesive mixed liquid;

[0031] (3) The nanocarbon / titanium oxide adhesive mixture is sprayed onto the surface of the porous base material, and then dried and calcined in sequence to obtain a recyclable nanocarbon / titanium oxide water treatment photocatalytic material.

[0032] In the present invention, in step (1), the nano-carbon powder comprises one or more of graphene oxide, reduced graphene oxide and carbon nanotubes, preferably graphene oxide and / or reduced graphene oxide, and more preferably graphene oxide.

[0033] In the present invention, in the step (1), the organic titanium source comprises one or more of butyl titanate, tetraethyl titanate, tetraisopropyl titanate and titanium isopropoxide, preferably one or more of butyl titanate, tetraethyl titanate and tetraisopropyl titanate, and more preferably butyl titanate and / or tetraethyl titanate.

[0034] In the present invention, in step (1), the oxide in the oxide quantum dot aqueous solution comprises one or more of tungsten oxide, bismuth oxide and iron oxide, preferably tungsten oxide and / or bismuth oxide, and more preferably tungsten oxide; wherein the concentration of the oxide quantum dot aqueous solution is 0.05 to 0.1 mg / mL, preferably 0.06 to 0.09 mg / mL, and more preferably 0.07 to 0.08 mg / mL.

[0035] In the present invention, in the step (1), the dosage ratio of nano-carbon powder, anhydrous ethanol, glacial acetic acid, organic titanium source and oxide quantum dot aqueous solution is 0.05-0.1g:50-100mL:2-6mL:5-20mL:20-50mL, preferably 0.06-0.09g:60-90mL:3-5mL:10-15mL:30-40mL, and further preferably 0.07-0.08g:70-80mL:4mL:15mL:40mL.

[0036] In the present invention, in the step (2), the adhesive is a silane coupling agent, aluminum dihydrogen phosphate or water glass, preferably a silane coupling agent or aluminum dihydrogen phosphate, and more preferably a silane coupling agent; the organic polymer is silicon polyvinyl pyrrolidone, ethyl cellulose or polyvinyl alcohol, preferably polyvinyl pyrrolidone or polyvinyl alcohol, and more preferably polyvinyl alcohol.

[0037] In the present invention, in the step (2), the usage ratio of the adhesive, the organic polymer, water, and the nanocarbon / titanium oxide precursor dry gel is 2-5 mL: 5-10 mg: 10-20 mL: 5-10 g, preferably 3-4 mL: 6-9 mg: 12-18 mL: 6-9 g, and further preferably 4 mL: 7-8 mg: 14-16 mL: 7-8 g.

[0038] In the present invention, in step (3), the porous matrix material comprises a porous alumina matrix material, a porous ceramic filler matrix material or a porous silica matrix material, preferably a porous alumina matrix material or a porous ceramic filler matrix material, and further preferably a porous ceramic filler matrix material.

[0039] In the present invention, the drying temperature is 80-100°C, preferably 85-95°C, and more preferably 90°C; the drying time is 8-12h, preferably 9-11h, and more preferably 10h; the calcination temperature is 350-550°C, preferably 400-500°C, and more preferably 450°C; the calcination time is 1-3h, and preferably 2h.

[0040] The invention provides a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material.

[0041] The present invention develops a visible light catalytic material with high catalytic efficiency by constructing an oxide quantum dot modified nanocarbon / titanium oxide water treatment photocatalytic material; on this basis, an inorganic adhesive is used as a binder to solidify a nanocarbon / titanium oxide precursor dry gel into a porous bulk catalytic material precursor, and finally a nanocarbon / titanium oxide water treatment photocatalytic material with visible light response, good water resistance, high catalytic activity and porous bulk structure is obtained by calcination. The nanocarbon / titanium oxide catalytic material is solidified on the surface of the porous bulk structure, which can give full play to the catalytic properties of the nanocarbon / titanium oxide catalyst and give the porous bulk material photocatalytic properties; at the same time, the adsorption properties of the porous bulk material itself can also be exerted, and the obtained material can be a water treatment photocatalytic material with both photocatalytic and adsorption properties, so it is conducive to solving the bottleneck problems of low activity, poor stability and difficult recovery of catalytic materials in sewage treatment engineering applications, and promoting the engineering application of photocatalytic sewage treatment technology.

[0042] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0043] Example 1

[0044] First, 0.05 g of graphene oxide, 50 mL of anhydrous ethanol, and 2 mL of glacial acetic acid were ultrasonically dispersed for 15 min. After mixing evenly, 5 mL of butyl titanate and 20 mL of tungsten oxide quantum dot aqueous solution were added under ultrasonic state, wherein the concentration of the tungsten oxide quantum dot aqueous solution was 0.05 mg / mL to form a graphene oxide / titanium oxide sol. After aging for 20 h, the sol was placed in an oven and dried at 80 °C for 10 h to obtain a graphene oxide / titanium oxide xerogel.

[0045] 2 mL of silane coupling agent and 5 mg of polyvinyl pyrrolidone were added to 10 mL of deionized water, and the mixture was stirred for 15 min to obtain an adhesive liquid. 5 g of graphene oxide / titanium oxide dry gel was added, and the mixture was ultrasonically stirred for 15 min to obtain a graphene oxide / titanium oxide adhesive mixed liquid.

[0046] The graphene oxide / titanium oxide adhesive mixture was sprayed on the surface of the porous alumina matrix material, dried at 80°C for 10 hours, and finally calcined under a nitrogen protective atmosphere at a temperature of 350°C for 1 hour. After natural cooling, a recyclable graphene oxide / titanium oxide water treatment photocatalytic material was obtained.

[0047] The XRD pattern of the recyclable graphene oxide / titanium oxide water treatment photocatalytic material prepared in Example 1 is as follows: Figure 1As shown. It can be seen that the recyclable graphene oxide / titanium oxide water treatment photocatalytic material mainly exhibits 6 strong diffraction peaks, which belong to the (101), (004), (200), (105), (211) and (204) crystal plane diffraction peaks of anatase TiO2 crystals, indicating that the obtained sample is a graphene oxide / titanium oxide-based water treatment photocatalytic material.

[0048] Example 2

[0049] First, 0.1 g of reduced graphene oxide, 100 mL of anhydrous ethanol, and 6 mL of glacial acetic acid were ultrasonically dispersed for 30 min. After mixing evenly, 20 mL of tetraethyl titanate and 50 mL of an aqueous solution of iron oxide quantum dots were added under ultrasonic conditions, wherein the concentration of the aqueous solution of iron oxide quantum dots was 0.1 mg / mL to form a reduced graphene oxide / titanium oxide sol. After aging for 24 h, the sol was placed in an oven and dried at 90 ° C for 12 h to obtain a reduced graphene oxide / titanium oxide xerogel.

[0050] 5 mL of aluminum dihydrogen phosphate and 10 mg of polyvinyl alcohol were added to 20 mL of deionized water, stirred for 30 min to obtain an adhesive liquid, 10 g of reduced graphene oxide / titanium oxide dry gel was added, and ultrasonic stirring was performed for 30 min to obtain a reduced graphene oxide / titanium oxide adhesive mixed liquid.

[0051] The reduced graphene oxide / titanium oxide adhesive mixture was sprayed on the surface of the porous ceramic matrix material, dried at 100°C for 8 hours, and finally calcined under argon protective atmosphere at a temperature of 550°C for 3 hours. After natural cooling, a recyclable reduced graphene oxide / titanium oxide water treatment photocatalytic material was obtained.

[0052] Figure 2 The photocatalytic performance of the prepared recyclable reduced graphene oxide / titanium oxide water treatment photocatalytic material. It can be seen that the matrix material exhibits very weak photocatalytic performance, the pure titanium oxide water treatment photocatalytic material exhibits certain photocatalytic performance, but the obtained reduced graphene oxide / titanium oxide water treatment photocatalytic material exhibits better photocatalytic performance, and can degrade 80% of the pollutants in the solution within 75 minutes. This result shows that loading catalytic active substances on the matrix can give the matrix certain photocatalytic performance.

[0053] Example 3

[0054] First, 0.075 carbon nanotubes, 80 mL of anhydrous ethanol, and 4 mL of glacial acetic acid were ultrasonically dispersed for 20 min. After mixing evenly, 15 mL of tetraisopropyl titanate and 30 mL of tungsten oxide quantum dot aqueous solution were added under ultrasonic state, wherein the concentration of the tungsten oxide quantum dot aqueous solution was 0.08 mg / mL to form a carbon nanotube / titanium oxide sol. After aging for 22 h, the sol was placed in an oven and dried at 100 °C for 10 h to obtain a carbon nanotube / titanium oxide dry gel.

[0055] 3 mL of water glass and 8.5 mg of polyvinyl pyrrolidone were added to 15 mL of deionized water, and stirred for 20 min to obtain an adhesive liquid. 8 g of carbon nanotube / titanium oxide dry gel was added, and ultrasonic stirring was performed for 20 min to obtain a carbon nanotube / titanium oxide adhesive mixed liquid.

[0056] The carbon nanotube / titanium oxide adhesive mixture is sprayed on the surface of the porous silicon oxide matrix material, dried at 90°C for 11 hours, and finally calcined under argon protective atmosphere at a temperature of 450°C for 2 hours. After natural cooling, a recyclable carbon nanotube / titanium oxide water treatment photocatalytic material is obtained.

[0057] Figure 3 This is the photocatalytic performance of the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material after calcination after use in Example 3. As can be seen from the figure, the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material still has good photocatalytic activity after two calcination treatments after use. This shows that the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material obtained has the characteristics of being reused and is expected to be used in actual industry.

[0058] Example 4

[0059] First, 0.07 g of carbon nanotubes, 80 mL of anhydrous ethanol, and 5 mL of glacial acetic acid were ultrasonically dispersed for 25 min. After mixing evenly, 10 mL of titanium isopropoxide and 40 mL of bismuth oxide quantum dot aqueous solution were added under ultrasonic conditions, wherein the concentration of the bismuth oxide quantum dot aqueous solution was 0.06 mg / mL to form a carbon nanotube / titanium oxide sol. After aging for 21 h, the sol was placed in an oven and dried at 90 ° C for 12 h to obtain a carbon nanotube / titanium oxide dry gel.

[0060] 4 mL of water glass and 9.5 mg of ethyl cellulose were added to 18 mL of deionized water, stirred for 18 min to obtain an adhesive liquid, 9 g of carbon nanotube / titanium oxide dry gel was added, and ultrasonic stirring was performed for 18 min to obtain a carbon nanotube / titanium oxide adhesive mixed liquid.

[0061] The carbon nanotube / titanium oxide adhesive mixture is sprayed on the surface of the porous ceramic base material, dried at 80°C for 8 hours, and finally calcined under a nitrogen protective atmosphere at a temperature of 500°C for 2.5 hours. After natural cooling, a recyclable carbon nanotube / titanium oxide water treatment photocatalytic material is obtained.

[0062] Figure 4 This is an optical photograph of the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material prepared in Example 4. Figure 4 It can be seen that the recyclable carbon nanotube / titanium oxide water treatment photocatalytic material obtained in Example 4 has an obvious pore structure.

[0063] In summary, the present invention constructs narrow-band oxide quantum dots-nanocarbon / titanium oxide-based materials and uses them as raw materials to prepare easily recyclable and highly catalytically active nanocarbon / titanium dioxide bulk porous photocatalytic materials. This method has a simple preparation process, readily available raw materials, low cost, and is easy to industrialize.

[0064] As can be seen from the above embodiments, the present invention provides a recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material and a preparation method thereof. The present invention first mixes nano-carbon powder, anhydrous ethanol, and glacial acetic acid, and then sequentially adds an organic titanium source and an oxide quantum dot aqueous solution to form a nano-carbon / titanium oxide sol; the nano-carbon / titanium oxide sol is sequentially aged and dried to obtain a nano-carbon / titanium oxide precursor dry gel; then an adhesive and an organic polymer are dispersed in water to obtain an adhesive liquid; the nano-carbon / titanium oxide precursor dry gel is dispersed in the adhesive liquid to obtain a nano-carbon / titanium oxide adhesive mixed liquid; finally, the nano-carbon / titanium oxide adhesive mixed liquid is sprayed on the surface of a porous matrix material, and then sequentially dried and calcined to obtain a recyclable nano-carbon / titanium oxide water treatment photocatalytic material. The present invention constructs a narrow-band oxide quantum dot-nano-carbon / titanium oxide-based material and uses it as a raw material to prepare a nano-carbon / titanium dioxide bulk porous photocatalytic material that is easy to recycle and has high catalytic activity.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a recyclable nanocarbon / titanium oxide-based water treatment photocatalytic material, characterized in that: The following steps are involved: (1) mixing nanocarbon powder, anhydrous ethanol, and glacial acetic acid, and then sequentially adding an organic titanium source and an oxide quantum dot aqueous solution to form a nanocarbon / titanium oxide sol; aging and drying the nanocarbon / titanium oxide sol in sequence to obtain a nanocarbon / titanium oxide precursor dry gel; (2) dispersing an adhesive and an organic polymer in water to obtain an adhesive liquid; dispersing a nanocarbon / titanium oxide precursor dry gel in the adhesive liquid to obtain a nanocarbon / titanium oxide adhesive mixed liquid; (3) spraying the nanocarbon / titanium oxide adhesive mixture onto the surface of the porous substrate material, and then sequentially drying and calcining to obtain a recyclable nanocarbon / titanium oxide water treatment photocatalytic material; In the step (1), the nano-carbon powder comprises one or more of graphene oxide, reduced graphene oxide and carbon nanotubes; In the step (1), the oxide in the oxide quantum dot aqueous solution comprises one or more of tungsten oxide, bismuth oxide and iron oxide; In the step (2), the adhesive is a silane coupling agent, aluminum dihydrogen phosphate or water glass; the organic polymer is polyvinyl pyrrolidone, ethyl cellulose or polyvinyl alcohol; In the step (2), the usage ratio of the adhesive, the organic polymer, water, and the nano-carbon / titanium oxide precursor dry gel is 2-5 mL: 5-10 mg: 10-20 mL: 5-10 g.

2. The preparation method according to claim 1, characterized in that: In the step (1), the organic titanium source comprises one or more of butyl titanate, tetraethyl titanate, tetraisopropyl titanate and titanium isopropoxide.

3. The preparation method according to claim 1 or 2, characterized in that: In the step (1), the concentration of the oxide quantum dot aqueous solution is 0.05 to 0.1 mg / mL.

4. The preparation method according to claim 3, characterized in that: In the step (1), the usage ratio of nano-carbon powder, anhydrous ethanol, glacial acetic acid, organic titanium source and oxide quantum dot aqueous solution is 0.05-0.1 g: 50-100 mL: 2-6 mL: 5-20 mL: 20-50 mL.

5. The preparation method according to claim 1, characterized in that: In the step (3), the porous matrix material comprises a porous alumina matrix material, a porous ceramic filler matrix material or a porous silica matrix material.

6. The preparation method according to claim 5, characterized in that: In the step (3), the drying temperature is 80-100° C., and the drying time is 8-12 hours; the calcination temperature is 350-550° C., and the calcination time is 1-3 hours.

7. A recyclable nano-carbon / titanium oxide-based water treatment photocatalytic material prepared by the preparation method according to any one of claims 1 to 6.

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