TiO2 / carbon felt photo-thermal-catalytic material, preparation method and photo-thermal interface evaporation purification device using TiO2 / carbon felt photo-thermal-catalytic material

Abstract

The invention discloses a TiO2 / carbon felt photo-thermal-catalytic material, a preparation method and a photo-thermal interface evaporation purification device applying the TiO2 / carbon felt photo-thermal-catalytic material, and the preparation method comprises the following steps: S1, slowly adding glacial acetic acid and Ti (OC4H9) 4 into absolute ethyl alcohol to form a solution A; adding deionized water into the other part of absolute ethyl alcohol to form a solution B; s2, uniformly spraying the solution A onto the CF by using a spray gun, and standing for 2 hours, so that the solution A is fully absorbed by the CF; s3, after standing, a B solution is sprayed to the CF on the heating plate by using the spray gun, Ti (OC4H9) 4 in the CF and the B solution are subjected to a hydrolysis reaction, and then high-temperature aging is performed for 8 h; and S4, completely drying the aged CF in a drying oven, and finally carrying out high-temperature calcination in a tubular furnace for 2 hours to obtain the TiO2 / carbon felt photo-thermal-catalytic material. The TiO2 / carbon felt photo-thermal-catalytic material synthesized in the limited range is firm in catalyst loading, not prone to falling off and high in photocatalytic degradation capacity and light absorption capacity; and the applied photo-thermal interface evaporation purification device has the advantages of high evaporation efficiency, high purification capacity and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of photothermal-catalytic materials and interface photothermal purification, and is specifically a TiO 2 / Carbon felt photothermal-catalytic material, preparation method and photothermal interface evaporation purification device using the same. Background Art

[0002] Currently, water purification products on the market mainly use filtration and separation to obtain pure water. In recent years, solar-driven interfacial water evaporation technology has attracted widespread attention from academia and industry. It can achieve eco-friendly, low-cost, safe, and electricity-independent seawater desalination, and is considered to be an excellent choice for producing pure water, becoming one of the most promising ways to alleviate the imminent freshwater shortage crisis. Photocatalysis is also a solar-driven interfacial process that can be intrinsically combined with the photothermal process to further treat polluted water and pollutants adsorbed on the photothermal-catalytic materials. Compared with advanced oxidation and adsorption technologies, photocatalysis has the unique advantages of not requiring the continuous addition of expensive oxidants and not being easily saturated, which is of great significance for sustainable operation; Patent publication number CN115974209B discloses an interfacial photothermal evaporator loaded with photocatalyst and its application, specifically disclosing the degradation of VOC by the photocatalytic effect of the loaded photocatalyst, achieving efficient degradation and removal of multiple VOCs while obtaining a higher evaporation flux, and producing clean distilled water that is not polluted by VOCs; however, since the water evaporation system and the condensation device are an integrated structure, the temperature and humidity of the water evaporation system are relatively high, resulting in the inability to condense water vapor in time, greatly reducing the evaporation performance of the evaporator; secondly, after the water vapor condenses into water droplets on the surface of the water evaporation device, light reflection is increased and light absorption is reduced. In addition, the condensed water will be evaporated and dissipated after a long period of illumination; therefore, there are problems such as low steam condensation efficiency, low output of clean water, low evaporation efficiency of the solution to be treated, poor purification capacity, and a relatively complicated manufacturing method of the photocatalytic material, weak catalyst loading, easy to fall off, and poor photocatalytic degradation capacity and light absorption capacity. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a TiO 2 / Carbon felt photothermal-catalytic material, preparation method and photothermal interface evaporation purification device for its application, confined synthesis of TiO 2 / Carbon felt photothermal-catalytic material has a firm catalyst load and is not easy to fall off, has strong photocatalytic degradation ability and light absorption ability, and a simple manufacturing method; the photothermal interface evaporation purification device has high light utilization and absorption rate, and the micro-airflow can quickly transfer water vapor from the evaporation device to the condensation device, and the condensed water droplets directly fall into the condensation water collection device, and the generated condensed water is collected in time, which increases the output of clean water, improves the condensation efficiency of steam and the collection speed of clean water, has high evaporation efficiency for the treated solution, and has strong purification ability, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a TiO 2 / Carbon felt photothermal-catalytic material preparation method, comprising the following steps: S1, glacial acetic acid and Ti(OC 4 H 9 ) 4 Slowly add anhydrous ethanol to form solution A, and the mass percentage of solution A is: 8-12% glacial acetic acid, Ti(OC 4 H 9 ) 4 The deionized water is 20-28%, and the anhydrous ethanol is 60-72%; deionized water is added to another portion of anhydrous ethanol to form a B solution, and the mass percentage content of the B solution is: deionized water is 20-30%, and anhydrous ethanol is 70-80%; S2. Use a spray gun to evenly spray solution A onto carbon felt (CF) and let it stand for 2 hours to allow solution A to be fully absorbed by CF and the anhydrous ethanol in solution A to evaporate; S3, after standing, spray solution B onto CF using a spray gun on the heating plate, and the Ti(OC 4 H 9 ) 4 Hydrolysis reaction occurs with solution B, followed by high temperature aging for 8 hours; S4, the aged CF was dried completely in an oven, and finally calcined in a tube furnace at high temperature for 2 h to obtain TiO 2 / Carbon felt photothermal-catalytic materials.

[0005] Furthermore, before the step S2, the cut CF is heat treated at 450 ºC in an air atmosphere for 2 h to remove impurities on the CF surface and increase oxygen-containing functional groups; then, it is ultrasonically treated in an acetone solution for 30 min to remove the remaining organic matter on the CF, and then the acetone is ultrasonically washed away with deionized water, and then dried in an oven at 80 ºC.

[0006] Furthermore, in step S1, HCl is used to adjust the pH value of solution B so that the pH value of solution B is ≤3.

[0007] Furthermore, in step S3, the temperature of the heating plate is 30°C, and the aging reaction temperature is 40°C.

[0008] Furthermore, in step S4, the oven temperature is 80°C, the temperature in the tube furnace is 450°C, and the heating rate is 3°C / min.

[0009] Furthermore, after step S4, the EPE insulation layer cut to a suitable size is taken and the EPE insulation layer is bonded to the TiO 2 / Carbon felt photothermal-catalytic material bottom surface, forming TiO 2 / Carbon felt-EPE photothermal-catalytic composite membrane.

[0010] To achieve the above object, the present invention also provides the following technical solution: a TiO 2 / Carbon Felt Photothermal-Catalytic Material, the TiO 2 The / carbon felt photothermal-catalytic material is prepared by the method described above.

[0011] To achieve the above object, the present invention also provides the following technical solution: a photothermal interface evaporation purification device, comprising an evaporation device, a condensation device and a condensed water collection device, wherein the evaporation device is a container structure for containing an aqueous solution to be treated, and a photothermal conversion material is floating on the liquid surface of the aqueous solution in the evaporation device, and the photothermal conversion material is the TiO 2 / Carbon felt photothermal-catalytic material; a sealing cover is fixedly provided at the open top of the evaporator, and an air blower and an air outlet connected to its internal cavity are provided on the upper side of the outer wall of the evaporator; the air inlet end of the air blower is connected to an aeration pump through a hose; the condensing device is a cooling water tank structure, a serpentine condenser is provided in the condensing device, a cooling water outlet pipe and a cooling water inlet pipe are respectively provided on the upper and lower sides of the outer wall of the condensing device, a condensate collecting device is provided at the lower end of the condensing device, and the end of the serpentine condenser penetrates into the condensate collecting device, and the air outlet is connected to the air inlet end of the serpentine condenser through a hose; a battery, an LED lamp and a solar panel are also provided on one side of the evaporator, and the LED lamp is arranged on the upper side of the evaporator through a lamp pole and is electrically connected to the battery.

[0012] Furthermore, a stirrer is provided at the bottom end of the evaporation device, and a sampling water injection pipe is also provided on the outer wall of the evaporation device.

[0013] Furthermore, the bottom end of the evaporation device is an open structure and also includes a bottom plate. The evaporation device, condensate collection device, aeration pump, LED lamp, solar panel and battery are all arranged on the bottom plate, and the bottom end of the evaporation device passes through the bottom plate. An inflatable float is provided at the bottom of the bottom plate; a water pump is also provided on the bottom plate, and the water outlet end of the water pump is connected to the cooling water inlet pipe, and the water pumping end of the water pump is connected to a hose; the water pump and the aeration pump are both electrically connected to the battery.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) TiO 2 The catalyst is confined in the pores of CF, the catalyst is firmly loaded and not easy to fall off, and the TiO 2 It provides more reaction sites for photocatalysis, increases the number of reflections of incident light, has strong photocatalytic degradation and light absorption capabilities, and stable water transport capabilities; (2) By utilizing TiO 2 / Carbon felt photothermal-catalytic material as a photothermal conversion material has strong photocatalytic and light absorption capabilities, which improves the evaporation efficiency and purification capacity of the photothermal interface evaporation purification device for the treated solution; (3) The micro-airflow blown from the air blast port can quickly transfer water vapor from the evaporation device to the serpentine condenser tube of the condensation device, preventing the problem of condensation difficulties caused by the evaporation part being exposed to sunlight, the temperature rising, and the high humidity in the closed space. The condensed water droplets fall not only by gravity, but also by the thrust generated by the micro-airflow, thereby increasing the collection speed of clean water; (4) The evaporation device and the condensation device are separated, and the condensed water droplets can be isolated from the evaporation device, ensuring a relatively dry environment inside the evaporation device, so that the light is directly irradiated on the air / surface water interface, thereby improving the utilization rate and absorption rate of light. The condensed water droplets directly fall into the condensed water collection device, and the generated condensed water is collected in time, thereby increasing the output of clean water and extending the service life of the photothermal conversion material; (5) The photothermal interface evaporation purification device can operate all day and night, making full use of solar energy to produce clean water around the clock, degrade pollutants, and meet the application requirements of interface water evaporation purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The TiO 2 / SEM image of carbon felt photothermal-catalytic material; Figure 2 The TiO2 directly hydrolyzed by the present invention 2 / Carbon Felt Photothermal-Catalytic Materials and Confined Synthesis of TiO 2 / Comparison chart of CIP performance of carbon felt photothermal-catalytic material degradation; Figure 3 This is a schematic structural diagram of a first embodiment of the photothermal interface evaporation purification device of the present invention; Figure 4 It is a schematic structural diagram of a second embodiment of the photothermal interface evaporation purification device of the present invention; Figure 5 This is a schematic diagram of the tuyere structure of the present invention; Figure 6 This is a graph showing the change in water evaporation rate and cumulative water production when the photothermal interface evaporation purification device of the present invention is in use, as well as a graph showing the change in CIP wastewater degradation.

[0016] In the figure: 1. Evaporation device; 11. Air blast port; 12. Air outlet; 13. Sealing cover; 14. Photothermal conversion material; 15. Sampling water injection pipe; 2. Condensation device; 21. Serpentine condenser; 22. Cooling water outlet pipe; 23. Cooling water inlet pipe; 24. Water pump; 3. Condensate collection device; 4. Aeration pump; 5. Agitator; 6. Bottom plate; 7. LED lamp; 8. Solar panel; 9. Battery; 10. Inflatable float. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0018] The present invention provides a technical solution: a TiO 2 / Carbon felt photothermal-catalytic material preparation method, comprising the following steps: S1, glacial acetic acid and Ti(OC 4 H 9 ) 4 Slowly add anhydrous ethanol to form solution A, and the mass percentage of solution A is: 8% glacial acetic acid, Ti(OC 4 H 9 ) 4 The deionized water is 20% and the anhydrous ethanol is 72%; deionized water is added to another portion of anhydrous ethanol to form a B solution, and the mass percentage content of the B solution is: deionized water is 30% and anhydrous ethanol is 70%; HCl is used to adjust the pH value of the B solution so that the pH of the B solution is ≤3; S2. Heat treat the cut CF in air at 450 ºC for 2 h to remove impurities on the surface of carbon felt (CF) and increase oxygen-containing functional groups; then ultrasonically treat in acetone solution for 30 min to remove the remaining organic matter on the CF, then ultrasonically wash away the acetone with deionized water, and then dry in an oven at 80 ºC; S3. Use a spray gun to evenly spray solution A onto CF and let it stand for 2 hours to allow solution A to be fully absorbed by CF and the anhydrous ethanol in solution A to evaporate; S4. After standing, spray solution B onto CF using a spray gun on a 30 ºC heating plate. Ti(OC4H9)4 in CF reacts with solution B for hydrolysis, and then the solution is aged at 40 ºC for 8 hours. S5. The aged CF was dried completely in an oven at 80 °C, and finally calcined in a tube furnace at 450 °C for 2 h at a heating rate of 3 °C / min to obtain TiO 2 / Carbon felt photothermal-catalytic materials; This embodiment uses the abundant micropores on the surface of CF to hydrolyze and age the catalyst (TiO 2 ) small molecules are “loaded” into the micropores on the CF surface; TiO 2 The precursor was hydrolyzed and grown on CF, and then calcined in a tube furnace to obtain TiO 2 / Carbon felt photothermal-catalytic material; This preparation method produces a confinement effect on the nanocatalyst, increases the specific surface area of ​​the catalyst, and avoids the problem of the traditional catalyst loading method being unstable and easy to fall off; TiO was synthesized by confined area 2 TiO is confined in the pores of CF to maintain its nanoscale size and form a macroscopic dual-function evaporator; TiO is evenly distributed on CF. 2 It provides more reaction sites for photocatalysis and increases the number of reflections of incident light, which not only enhances the photocatalytic and light absorption capabilities, but also the reduction in CF pore size enhances the capillary effect and ensures stable water transport capacity.

[0019] See also Figure 1 The TiO 2 SEM image of the photothermal-catalytic material of carbon felt. Compared with the smooth and grooved surface of CF, the surface of CF after loading is covered with TiO 2 Uniform coverage; and TiO 2 The load causes the CF surface to no longer be flat and smooth, and the uneven surface can increase its absorption of light through multiple scattering and reflection; Comparative Example: TiO prepared by direct hydrolysis 2 / carbon felt photothermal-catalytic material. The specific steps are: 4 H9 ) 4 Add to anhydrous ethanol and mix evenly, then use a spray gun to evenly spray the mixed solution on the CF surface; then place the sprayed CF in a humid environment to make Ti(OC 4 H 9 ) 4 The direct hydrolysis TiO was obtained by natural hydrolysis for 12 h. 2 / Carbon felt photothermal-catalytic materials; Experimental verification 1: TiO synthesized by confinement using multiple circular structures 2 / Carbon Felt Photothermal-Catalytic Materials and TiO Obtained by Direct Hydrolysis 2 / carbon felt photothermal-catalytic materials were subjected to the following experiments, and TiO 2 / The diameter of the carbon felt photothermal-catalytic material is 6.1cm and the thickness is 1mm; First, the initial material was weighed, and then a 15 mg / L ciprofloxacin (CIP) solution was added to simulate the contaminated water sample. 2 The photothermal-catalytic material of carbon felt was placed in a ciprofloxacin solution and placed in the dark for 30 min to reach dark adsorption equilibrium. After that, it was placed under a 30 W LED light source and the TiO 2 / Carbon felt photothermal-catalytic material, after being rinsed and dried with deionized water, TiO 2 / Carbon felt photothermal-catalytic material is weighed, compared with the initial material, and the amount of catalyst falling off is calculated; the falling off amount is calculated multiple times according to the above method; The test data are shown in Table 1: Table 1 Comparison of shedding amount after recycling using different preparation methods

[0020] From the table above we can see that: TiO prepared by direct hydrolysis 2 / Carbon felt photothermal-catalytic materials lose a lot of catalyst after use and cleaning, while TiO 2 / Carbon felt photothermal-catalytic material has less catalyst shedding after use and cleaning; The concentration of ciprofloxacin solution in the above experiment changes as follows Figure 2 As shown in Figure 2, the degradation ability can be reflected from the change in the concentration of ciprofloxacin solution. The lower the concentration of ciprofloxacin solution, the better the degradation ability. Figure 2 It can be seen that TiO 2 / Carbon felt photothermal-catalytic material has a degradation ability that is significantly inferior to that of confined synthesized TiO 2 / Carbon felt photothermal-catalytic materials.

[0021] Furthermore, the EPE insulation layer cut to a suitable size is bonded to the TiO 2 / carbon felt photothermal-catalytic material bottom surface, to obtain TiO 2 / Carbon felt-EPE photothermal-catalytic composite membrane, TiO 2 / The carbon felt-EPE photothermal-catalytic composite membrane floats on the liquid surface with good stability. Embodiment 2

[0022] The present invention also provides a technical solution: a TiO 2 / Carbon felt photothermal-catalytic material preparation method, comprising the following steps: S1, glacial acetic acid and Ti(OC 4 H 9 ) 4 Slowly add anhydrous ethanol to form solution A, and the mass percentage of solution A is: 10% glacial acetic acid, Ti(OC 4 H 9 ) 4 The deionized water is 24% and the anhydrous ethanol is 66%; deionized water is added to another portion of anhydrous ethanol to form a B solution, and the mass percentage content of the B solution is: deionized water is 25% and anhydrous ethanol is 75%; HCl is used to adjust the pH value of the B solution so that the pH of the B solution is ≤3; S2. Heat treat the cut CF in air at 450 ºC for 2 h to remove impurities on the surface of carbon felt (CF) and increase oxygen-containing functional groups; then ultrasonically treat in acetone solution for 30 min to remove the remaining organic matter on the CF, then ultrasonically wash away the acetone with deionized water, and then dry in an oven at 80 ºC; S3. Use a spray gun to evenly spray solution A onto CF and let it stand for 2 hours to allow solution A to be fully absorbed by CF and the anhydrous ethanol in solution A to evaporate; S4. After standing, spray solution B onto CF using a spray gun on a 30 ºC heating plate. Ti(OC4H9)4 in CF reacts with solution B for hydrolysis, and then the solution is aged at 40 ºC for 8 hours. S5. The aged CF was dried completely in an oven at 80 °C, and finally calcined in a tube furnace at 450 °C for 2 h at a heating rate of 3 °C / min to obtain TiO 2 / Carbon felt photothermal-catalytic materials; Furthermore, the EPE insulation layer cut to a suitable size is bonded to the TiO 2 / carbon felt photothermal-catalytic material bottom surface, to obtain TiO 2 / Carbon felt-EPE photothermal-catalytic composite membrane, TiO 2 / The carbon felt-EPE photothermal-catalytic composite membrane floats on the liquid surface with good stability. Embodiment 3

[0023] The present invention also provides a technical solution: a TiO 2 / Carbon felt photothermal-catalytic material preparation method, comprising the following steps: S1, glacial acetic acid and Ti(OC 4 H 9 ) 4 Slowly add anhydrous ethanol to form solution A, and the mass percentage of solution A is: 12% glacial acetic acid, Ti(OC 4 H 9 ) 4 The deionized water is 28% and the anhydrous ethanol is 60%; deionized water is added to another portion of anhydrous ethanol to form a B solution, and the mass percentage content of the B solution is: deionized water is 20% and anhydrous ethanol is 80%; HCl is used to adjust the pH value of the B solution so that the pH of the B solution is ≤3; S2. Heat treat the cut CF in air at 450 ºC for 2 h to remove impurities on the surface of carbon felt (CF) and increase oxygen-containing functional groups; then ultrasonically treat in acetone solution for 30 min to remove the remaining organic matter on the CF, then ultrasonically wash away the acetone with deionized water, and then dry in an oven at 80 ºC; S3. Use a spray gun to evenly spray solution A onto CF and let it stand for 2 hours to allow solution A to be fully absorbed by CF and the anhydrous ethanol in solution A to evaporate; S4. After standing, spray solution B onto CF using a spray gun on a 30 ºC heating plate. Ti(OC4H9)4 in CF reacts with solution B for hydrolysis, and then the solution is aged at 40 ºC for 8 hours. S5. The aged CF was dried completely in an oven at 80 °C, and finally calcined in a tube furnace at 450 °C for 2 h at a heating rate of 3 °C / min to obtain TiO 2 / Carbon felt photothermal-catalytic materials; Furthermore, the EPE insulation layer cut to a suitable size is bonded to the TiO 2 / carbon felt photothermal-catalytic material bottom surface, to obtain TiO 2 / Carbon felt-EPE photothermal-catalytic composite membrane, TiO 2 / The carbon felt-EPE photothermal-catalytic composite membrane floats on the liquid surface with good stability. Embodiment 4

[0024] The present invention also provides a technical solution: a TiO 2 / Carbon Felt Photothermal-Catalytic Material, the TiO 2The / carbon felt photothermal-catalytic material is prepared by the method described above. Embodiment 5

[0025] See also Figure 3 and Figure 5-6 The present invention also provides a technical solution: a photothermal interface evaporation purification device, comprising an evaporation device 1, a condensation device 2 and a condensed water collection device 3, wherein the evaporation device 1 is a container structure for containing an aqueous solution to be treated, and a photothermal conversion material 14 is floating on the liquid surface of the aqueous solution in the evaporation device 1, and the photothermal conversion material 14 is the TiO 2 / Carbon felt photothermal-catalytic material; A sealing cover 13 is fixedly provided at the open top of the evaporation device 1, and an air blast port 11 and an air outlet 12 connected to the internal cavity of the evaporation device 1 are provided on the upper side of the outer wall of the evaporation device 1; the air blast port 11 and the air outlet 12 are both trapezoidal flat tube structures; the air inlet end of the air blast port 11 is connected to an aeration pump 4 through a hose; a serpentine condenser tube 21 is provided in the condensation device 2, and a cooling water outlet pipe 22 and a cooling water inlet pipe 23 are provided on the upper and lower sides of the outer wall of the condensation device 2, respectively, and the condensation device 2 is provided with a cooling water outlet pipe 22 and a cooling water inlet pipe 23. A condensation water collecting device 3 is provided at the lower end of the device 2, and the end of the serpentine condensation tube 21 passes through the condensation water collecting device 3, and the air outlet 12 is connected to the air inlet end of the serpentine condensation tube 21 through a hose; a battery 9, an LED lamp 7 and a solar panel 8 are also provided on one side of the evaporation device 1, and the LED lamp 7 is arranged on the upper side of the evaporation device 1 through a lamp pole and is electrically connected to the battery 9; an agitator 5 is provided at the bottom end of the evaporation device 1, and a sampling water injection pipe 15 is also provided on the outer wall of the evaporation device 1.

[0026] Working principle: The aqueous solution to be treated is injected into the evaporation device 1 through the sampling water injection pipe 15, and the photothermal conversion material 14 floats on the liquid surface of the aqueous solution to be treated; the condensation device 2 is connected to the external circulating cooling water supply device through the cooling water inlet pipe 23 and the cooling water outlet pipe 22; When there is sufficient sunlight during the day, sunlight irradiates the photothermal conversion material 14, causing it to absorb solar energy and convert it into heat energy, thereby promoting water evaporation and sewage degradation. The aqueous solution to be treated continuously evaporates into water vapor and flows upward to condense. A micro-airflow is blown to the air outlet 11 through the aeration pump 4 to blow the water vapor into the serpentine condenser tube 21 of the condensing device 2. The water vapor condenses into clean water droplets in the serpentine condenser tube 21. The water droplets condensed in the serpentine condenser tube 21 fall into the condensed water collection device 3 under the action of micro-airflow and gravity; the evaporating device 1 is vibrated by the agitator 5, so that the pollutants in the aqueous solution to be treated in the evaporating device 1 are evenly dispersed; at the same time, the solar panel 8 and the storage battery 9 start to work to collect solar energy, and the solar energy collected by the storage battery 9 is converted into electrical energy; When there is no light at night, the battery 9 supplies power to the LED lamp 7 , the LED lamp 7 lights up, and the photothermal conversion material 14 continues to evaporate water and degrade sewage under the illumination of the LED lamp 7 .

[0027] The photothermal interface evaporation purification device disclosed in this embodiment can quickly transfer water vapor from the evaporation device 1 to the serpentine condensation tube 21 of the condensation device 2 through the micro-airflow blown from the air blower 11, thereby preventing the problem of condensation difficulty caused by the evaporation part being exposed to sunlight, the temperature rising, and the high humidity in the closed space, so that the falling of the condensed water droplets not only depends on gravity, but also on the thrust generated by the micro-airflow, thereby improving the collection speed of clean water; The evaporation device 1 and the condensation device 2 are separately arranged, and the condensed water droplets can be isolated from the evaporation device 1, thereby ensuring a relatively dry environment inside the evaporation device 1, so that the light is directly irradiated on the air / surface water interface, thereby improving the utilization rate and absorption rate of light, and the condensed water droplets directly fall into the condensed water collection device 3, and the generated condensed water is collected in time, thereby improving the output of clean water and extending the service life of the photothermal conversion material 14; By utilizing TiO 2 / Carbon felt photothermal-catalytic material as photothermal conversion material 14 has strong photocatalytic and light absorption capabilities, which improves the evaporation efficiency and purification capacity of the photothermal interface evaporation purification device for the solution to be treated; The photothermal interface evaporation purification device can operate all day and night, making full use of solar energy to produce clean water around the clock, degrade pollutants, and meet the application requirements of interface water evaporation purification; Experimental verification 2: A circular TiO2 with a diameter of 6.1 cm and a thickness of 1 mm was used. 2 / Carbon felt photothermal-catalytic materials were used for the following experiments: A photothermal catalytic water evaporation experiment was conducted outdoors using a 15 mg / L ciprofloxacin solution to simulate contaminated water samples and natural sunlight as the light source. The water evaporation system was placed outdoors between 7:00 and 19:00, and the hourly condensed water production was detected in real time during this period.

[0028] See also Figure 6 The performance of the interface water evaporation purification device of the present invention under sunlight irradiation is shown in a. The average water evaporation rate during 12 hours during the day is as high as 2.10 kg / m 2 / h, the yield of condensed water is 25.09 kg / m 2 ; see Figure 6 The concentration change of pollutants under sunlight irradiation is shown in c. The removal efficiency of CIP is 95.7% after 3 hours.

[0029] Experimental verification 3: Using a circular TiO2 with a diameter of 6.1 cm and a thickness of 1 mm 2 / Carbon felt photothermal-catalytic materials were used for the following experiments: A 15 mg / L ciprofloxacin solution was used to simulate a contaminated water sample. The electric energy stored in the battery 9 during the day was used to light up the 30 W LED lamp 7. The simulated water evaporation system was placed indoors during 19:00-07:00, and the hourly condensed water production was also monitored in real time.

[0030] See also Figure 6 b shows the performance of the interface water evaporation purification device of the present invention when illuminated by a 30W LED lamp 7 at night. The interface water evaporation purification device also maintains a stable and efficient evaporation rate, with an average water evaporation rate of 1.78 kg / m 2 / h, the yield of condensed water is 21.34 kg / m 2 ; see Figure 6 c shows the change in pollutant concentration under the irradiation of LED light 7. The CIP removal rate is 92.5% after 3 hours. Embodiment 6

[0031] See also Figure 4-5 Compared with the fifth embodiment, the bottom end of the evaporation device 1 is an open structure and further includes a bottom plate 6. The evaporation device 1, the condensed water collection device 3, the aeration pump 4, the LED lamp 7, the solar panel 8 and the battery 9 are all arranged on the bottom plate 6, and the bottom end of the evaporation device 1 passes through the bottom plate 6. An inflatable float 10 is provided at the bottom of the bottom plate 6. A water pump 24 is also provided on the bottom plate 6, and the water outlet end of the water pump 24 is connected to the cooling water inlet pipe 23, and the water pumping end of the water pump 24 is connected to a hose. The water pump 24 and the aeration pump 4 are both electrically connected to the battery 9.

[0032] Compared with Example 5, this embodiment can float on the aqueous solution to be treated to perform interfacial photothermal water evaporation purification treatment, and the seawater is delivered to the cooling water inlet pipe 23 of the condensation device 2 through a hose connected to the water pump 24 pumping end, so as to cool the serpentine condenser 21, thereby condensing the water vapor into clean water in the serpentine condenser 21.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a TiO2 / carbon felt photothermal-catalytic material, characterized in that: The following steps are involved: S1. Slowly add glacial acetic acid and Ti(OC4H9)4 into anhydrous ethanol to form solution A, wherein the mass percentage content of solution A is: 8-12% glacial acetic acid, 20-28% Ti(OC4H9)4, and 60-72% anhydrous ethanol; add deionized water into another portion of anhydrous ethanol to form solution B, wherein the mass percentage content of solution B is: 20-30% deionized water, and 70-80% anhydrous ethanol; S2. Use a spray gun to evenly spray solution A onto CF and let it stand for 2 hours to allow solution A to be fully absorbed by CF and the anhydrous ethanol in solution A to evaporate; S3, after standing, spray solution B onto CF using a spray gun on a heating plate, Ti(OC4H9)4 in CF reacts with solution B for hydrolysis, and then ageing at high temperature for 8h; S4. Dry the aged CF completely in an oven, and finally calcine it at high temperature in a tubular furnace for 2 hours to obtain the TiO2 / carbon felt photothermal-catalytic material.

2. The method for preparing a TiO2 / carbon felt photothermal-catalytic material according to claim 1, characterized in that: Before the step S2, the cut CF is heat treated at 450°C in an air atmosphere for 2 hours to remove impurities on the CF surface and increase oxygen-containing functional groups; then, it is ultrasonically treated in an acetone solution for 30 minutes to remove the remaining organic matter on the CF, and then the acetone is ultrasonically washed away with deionized water, and then dried in an oven at 80°C.

3. The method for preparing a TiO2 / carbon felt photothermal-catalytic material according to claim 1, characterized in that: In step S1, HCl is used to adjust the pH value of solution B so that the pH value of solution B is ≤3.

4. The method for preparing a TiO2 / carbon felt photothermal-catalytic material according to claim 1, characterized in that: In step S3, the temperature of the heating plate is 30°C, and the aging reaction temperature is 40°C.

5. The method for preparing a TiO2 / carbon felt photothermal-catalytic material according to claim 1, characterized in that: In step S4, the oven temperature is 80°C; the temperature in the tube furnace is 450°C, and the heating rate is 3°C / min.

6. The method for preparing a TiO2 / carbon felt photothermal-catalytic material according to claim 1, characterized in that: After step S4, take the EPE insulation layer cut to a suitable size, and bond the EPE insulation layer to the bottom surface of the TiO2 / carbon felt photothermal-catalytic material by glue to form a TiO2 / carbon felt-EPE photothermal-catalytic composite film.

7. A TiO2 / carbon felt photothermal-catalytic material, characterized in that: The TiO2 / carbon felt photothermal-catalytic material is prepared by the method described in any one of claims 1-6.

8. A photothermal interface evaporation purification device, comprising an evaporation device, a condensation device and a condensed water collection device, characterized in that: The evaporation device is a container structure for accommodating the aqueous solution to be treated, and a photothermal conversion material is floated on the liquid surface of the aqueous solution in the evaporation device, and the photothermal conversion material is the TiO2 / carbon felt photothermal-catalytic material described in claim 7; a sealing cover is fixedly provided at the open top of the evaporation device, and an air blow hole and an air outlet connected to its internal cavity are provided on the upper side of the outer wall of the evaporation device; an aeration pump is connected to the air inlet end of the air blow hole through a hose; a serpentine condenser is provided in the condensation device, and a cooling water outlet pipe and a cooling water inlet pipe are respectively provided on the upper and lower sides of the outer wall of the condensation device, a condensation water collecting device is provided at the lower end of the condensation device, and the end of the serpentine condenser penetrates into the condensation water collecting device, and the air outlet is connected to the air inlet end of the serpentine condenser through a hose; a battery, an LED lamp and a solar panel are also provided on one side of the evaporation device, and the LED lamp is arranged on the upper side of the evaporation device through a lamp pole and is electrically connected to the battery.

9. The photothermal interface evaporation purification device according to claim 8, characterized in that: The bottom end of the evaporation device is provided with a stirrer, and the outer wall of the evaporation device is also provided with a sampling water injection pipe.

10. The photothermal interface evaporation purification device according to claim 8, characterized in that: The bottom end of the evaporation device is an open structure and also includes a bottom plate. The evaporation device, condensate collection device, aeration pump, LED lamp, solar panel and battery are all arranged on the bottom plate, and the bottom end of the evaporation device passes through the bottom plate. An inflatable float is provided at the bottom of the bottom plate. A water pump is also provided on the bottom plate, and the water outlet end of the water pump is connected to the cooling water inlet pipe, and the water pumping end of the water pump is connected to a hose. The water pump and the aeration pump are both electrically connected to the battery.

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