Solar-driven photocatalytic water purification treatment device, method and application

Abstract

The invention provides a solar-driven photocatalytic water purification treatment device and method and application, and belongs to the technical field of photocatalytic material application and the technical field of water pollution treatment. The treatment device comprises a solar energy absorption unit for converting absorbed solar energy into electric energy, an electric energy storage unit for storing the electric energy, a photocatalytic degradation unit and a condensation reflux unit for condensing and recovering distilled water. Wherein the photocatalytic degradation unit comprises a heating body and a photocatalyst, and the heating body is used for heating and distilling sewage by using electric energy; the photocatalyst is used for degrading the sewage under the irradiation of sunlight. The invention further provides a building method of the device and application of the device in the field of water pollution. By using the treatment device disclosed by the invention, the catalytic degradation of sewage is realized through the synergistic utilization of solar energy, the energy storage battery, the heating body and the photocatalyst, so that the limitation of power shortage in remote mountainous areas is broken through, and the cleanliness of water is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photocatalytic material application and water pollution control, and in particular to a solar-driven photocatalytic water purification device, method and application. Background Art

[0002] In special circumstances such as remote mountainous areas and desert environments, the use of electricity is often limited by power shortages. In order to conveniently obtain energy, various intelligent self-powered systems including photovoltaic power generation and piezoelectric nanogenerators have been integrated into rechargeable batteries. However, the intermittent nature and low energy density of various applied energy sources in these self-powered systems hinder their further application space. Therefore, the development of a simple and low-cost self-powered system that can be used in special circumstances such as remote mountainous areas and deserts is critical for the application of batteries in these harsh environments.

[0003] Solar energy has attracted much attention due to its advantages such as being pollution-free and not subject to geographical restrictions. With the continuous increase in population, the acquisition and recycling of fresh water resources is also an important issue in the context of sustainable development. In related industrial applications, fresh water resources are mainly obtained by burning fossil fuels such as coal, which will seriously pollute the environment.

[0004] Therefore, we very much hope to explore ways to obtain fresh water resources under harsh conditions without relying on electricity. Summary of the invention

[0005] In view of this, the present disclosure provides a solar-driven photocatalytic water purification device, method and application, which achieves catalytic degradation of sewage without being restricted by electricity through the coordinated use of solar energy, energy storage batteries, heating bodies and photocatalysts.

[0006] In order to achieve the above-mentioned purpose, as one aspect of the present disclosure, a solar-driven photocatalytic water purification device is provided, comprising: a solar absorption unit for converting absorbed solar energy into electrical energy; an electrical energy storage unit for storing electrical energy; a photocatalytic degradation unit, comprising a heating body and a photocatalyst, the heating body being used to heat and distill sewage using electrical energy; the photocatalyst being used to degrade sewage under the irradiation of sunlight; and a condensation reflux unit being used to condense and recover distilled water.

[0007] In an embodiment of the present disclosure, the heating body includes at least one of a ceramic heating body, a glass heating body, and a quartz heating body. Preferably, the heating body is a ceramic heating body.

[0008] In an embodiment of the present disclosure, the catalyst includes at least one of a bismuth-based oxyhalide photocatalyst or a perovskite photocatalyst.

[0009] In the embodiment of the present disclosure, the catalyst is a bismuth-based oxyhalide photocatalyst, and the structural formula of the bismuth-based oxyhalide photocatalyst is: Bi n+3 Fe n-2 TiO 3n+5 X, (X = Cl, Br and I). Wherein, 3≤n≤5, preferably, the structural formula of the bismuth-based oxyhalide photocatalyst is Bi6FeTi2O 14 Cl.

[0010] In an embodiment of the present disclosure, the solar energy absorption unit includes: a solar cell panel for absorbing light, and the output power of the solar cell panel is 50W-1000W.

[0011] In an embodiment of the present disclosure, the electric energy storage unit includes: a rechargeable battery, including at least one of a button battery, a cylindrical battery or a flow battery.

[0012] In an embodiment of the present disclosure, the condensation reflux unit includes a condensation device and a recovery container, and the recovery container is connected to the photocatalytic degradation unit through the condensation device.

[0013] In the embodiments of the present disclosure, Bi6FeTi2O 14 Cl is prepared by a molten salt method, using a stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOCl=5:4:1:2 to weigh and mix; adding cesium chloride and sodium chloride molten salt in a molten salt ratio of 1:1, grinding and calcining in sequence, wherein the calcination temperature is 500-750°C, and the calcination time is 10-14 hours.

[0014] As another aspect of the present disclosure, a method for constructing a solar-driven photocatalytic water purification device is provided, comprising the following steps: a solar panel absorbs solar energy and performs photoelectric conversion, and stores electrical energy through an electrical energy storage unit; a heating body is placed in sewage, and a photocatalyst is added to degrade the sewage under sunlight; the degraded water is heated and distilled by the heating body under the action of electrical energy, and the water vapor obtained by the heated distillation is condensed and recovered to obtain distilled water.

[0015] As another aspect of the present disclosure, there is provided an application of a solar-driven photocatalytic water purification device in water pollution treatment.

[0016] Based on the solar-driven photocatalytic water purification treatment device, method and application of the above-mentioned embodiments of the present disclosure, the solar absorption unit converts solar energy into electrical energy and stores the electrical energy through a rechargeable battery, and then connects to the heating body through a circuit board, and places the heating body in the sewage in the photocatalytic degradation unit. The heating body in the photocatalytic degradation unit heats the sewage by utilizing the electrical energy of the electrical energy storage unit. The photocatalytic degradation unit also includes a photocatalyst, which degrades the sewage under the irradiation of sunlight to obtain pure water. The degraded pure water is heated by the heating body, so that the pure water is distilled and finally refluxed to the condensation reflux unit to obtain distilled water. Through the coordinated use of solar energy, energy storage batteries, heating bodies and photocatalysts, sewage is purified and pure water is obtained in harsh environments with power shortages such as remote mountainous areas and deserts, thereby realizing the recycling of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present disclosure is further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 The schematic diagram of the principle of a solar-driven photocatalytic water purification device in one embodiment of the present disclosure is shown;

[0019] Figure 2 The schematic diagram of the structure of the Sillen-Aurivillius phase layered structure of the bismuth-based oxyhalide photocatalyst in one embodiment of the present disclosure is shown;

[0020] Figure 3 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 X-ray photoelectron spectroscopy (XPS) of Cl;

[0021] Figure 4 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 Schematic diagram of the effect of Cl on the removal of Triphenyl Blue (TB);

[0022] Figure 5 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 Schematic diagram of the effect of X (X = Br, I) on the removal of Rhodamine B (Rh B), wherein (a) is a schematic diagram of the effect of two photocatalysts on the removal of Rhodamine B; (b) is the logarithm of the corresponding value in (a); and

[0023] Figure 6 A flow chart of a method for treating a water purification device using solar-driven photocatalysis according to an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0024] As energy crisis and environmental problems become increasingly serious, how to efficiently utilize renewable energy with abundant reserves and low pollution is an urgent problem. Photocatalytic technology uses solar energy as energy, is cheap and easy to obtain, and has a wide range of applications. Photocatalyst materials can be used to degrade organic pollutants, antibiotics and other substances, and the catalytic degradation of photocatalysts can obtain fresh water resources that can be recycled.

[0025] In special circumstances such as remote mountainous areas and desert environments, the use of electricity is often limited by power shortages. In the process of implementing the present disclosure, it was found that how to conveniently obtain electrical energy to purify sewage and prepare reusable pure water resources is a difficulty in purifying sewage in harsh environments.

[0026] In view of this, the present disclosure proposes the coordinated use of solar energy, energy storage batteries, heating bodies and photocatalysts. Through the rational use of solar energy resources, it is possible to purify and distill sewage in harsh environments with power shortages such as remote mountainous areas and deserts, and ultimately obtain pure water, thereby realizing the recycling of water resources.

[0027] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] According to some embodiments of the present disclosure, there is provided a solar-driven photocatalytic water purification device, comprising: a solar energy absorption unit, an electric energy storage unit, a photocatalytic degradation unit, and a condensation reflux unit. Figure 1 The schematic diagram of the principle of a solar-driven photocatalytic water purification device in one embodiment of the present disclosure is schematically shown.

[0029] The following combination Figure 1 A solar-driven photocatalytic water purification device in an embodiment of the present disclosure is described in detail.

[0030] The solar energy absorption unit is used to convert the absorbed solar energy into electrical energy. The solar energy absorption unit includes a solar panel, a circuit board, a voltmeter (not shown in the figure) and a control switch (not shown in the figure). The circuit board is used to connect the solar panel with the electrical energy storage unit. The voltmeter includes a digital voltmeter. By reading the data on the voltmeter, the conversion process between light and electricity is controlled.

[0031] The electric energy storage unit is used to store electric energy. The electric energy storage unit includes a circuit board and a rechargeable battery. The circuit board is used to connect the solar panel and the rechargeable battery. The rechargeable battery can be selected with a battery with a power display component as required. By reading the data of the battery, the amount of electricity stored in the battery can be known, and the reaction progress of the water purification treatment device can be further regulated according to the amount of electricity.

[0032] The photocatalytic degradation unit is used for catalytic degradation of sewage, and comprises a reaction container, a circuit board, a heating body and a photocatalyst, wherein the circuit board is used to connect the rechargeable battery with the heating body, the heating body is connected with the circuit board and placed in the sewage reaction solution, and the heating body uses electric energy to heat and distill the sewage; the photocatalyst is used to degrade the sewage under the irradiation of sunlight.

[0033] The condensation reflux unit is used to condense and recover distilled water. The condensation reflux unit includes a condenser and a recovery container. The condenser connects the photocatalytic reaction container and the recovery container. The condenser is used to condense and collect the pure water obtained in the photocatalytic degradation, and the recovery container is used to recover the condensed distilled water.

[0034] In the embodiment of the present disclosure, when sunlight shines on the semiconductor pn junction in the solar panel, a new electron-hole pair is formed. Under the action of the pn junction electric field, the hole flows from the p region to the n region, and the electron flows from the n region to the p region. When the circuit is connected, a current is formed, which is converted into electrical energy and transmitted to the rechargeable battery through the circuit board. The rechargeable battery stores the electrical energy and is connected to the heating body through the circuit board. The heating body is placed in the sewage in the photocatalytic degradation unit. The heating body in the photocatalytic degradation unit heats the sewage by utilizing the electrical energy of the energy storage unit. The photocatalytic degradation unit also includes a photocatalyst, which degrades the sewage under the irradiation of sunlight to obtain pure water. The degraded pure water is heated by the heating body, so that the pure water is distilled and finally refluxed to the condensation reflux unit to obtain distilled water. The water purification treatment device of the embodiment of the present disclosure purifies sewage and obtains pure water in harsh environments with power shortages such as remote mountainous areas and deserts through the coordinated use of solar energy, energy storage batteries, heating bodies and photocatalysts, thereby realizing the recycling of water resources.

[0035] Furthermore, an external voltmeter can be selected as required to achieve regulation of the current passing through the water purification treatment device.

[0036] According to an embodiment of the present disclosure, the solar energy absorption unit includes a solar panel for absorbing light, and the output power of the solar panel is 50W-1000W, for example, 50W, 100W, 200W, 300W, 400W, 500W, 600W, 700W, 800W, 900W, 1000W. The output power of the solar panel is selected according to the amount of sewage to be degraded.

[0037] According to an embodiment of the present disclosure, the electric energy storage unit includes a rechargeable battery, and the rechargeable battery includes at least one of a button battery, a cylindrical battery, or a flow battery. The button battery structure has the characteristics of small size and easy operation, and is often used at the laboratory level; the cylindrical battery structure has the characteristics of high energy density, and is often used in portable energy sources such as laptops and digital cameras; the flow battery structure has the characteristics of large battery capacity, and is often used in larger-scale energy storage equipment.

[0038] According to an embodiment of the present disclosure, the heating body includes at least one of a ceramic heating body, a glass heating body, and a quartz heating body. For example, the heating body is a ceramic heating body. The interior of the heating body can be made of a thermistor wire or a metal sheet as required, and the exterior of the thermistor wire or the metal sheet can be made of ceramic, glass, quartz, etc. to prevent sewage from corroding the internal thermistor wire or the metal sheet. At the same time, the insulating materials of ceramic, glass, and quartz improve the safety of the electric heat conversion of the heating body. In the process of conducting relevant preliminary experiments of the present disclosure, it was found that when the heating body is a ceramic heating body, the effect of use is better.

[0039] According to an embodiment of the present disclosure, the catalyst includes at least one of a bismuth-based oxyhalide photocatalyst or a perovskite photocatalyst. As a semiconductor photocatalyst, the bismuth-based oxyhalide photocatalyst or the perovskite photocatalyst has good light stability and a high visible light response range.

[0040] Furthermore, the catalyst is a bismuth-based oxyhalide photocatalyst, and the structural formula of the bismuth-based oxyhalide photocatalyst is: Bi n+3 Fe n-2 TiO 3n+5 X, (X = Cl, Br and I), where 3≤n≤5.

[0041] In some embodiments, the bismuth-based oxyhalide photocatalyst has the structural formula Bi6FeTi2O 14 Cl.

[0042] Figure 2 The schematic diagram of the structure of the Sillen-Aurivillius phase layered structure of the bismuth-based oxyhalide photocatalyst in one embodiment of the present disclosure is shown. Figure 2As shown, the bismuth-based oxyhalide photocatalyst has a layered structure and a suitable bandgap width. The top of the valence band is mainly contributed by the O2p orbital, and the conduction band is mainly contributed by the Bi6p orbital. At the same time, the layered bismuth-based oxyhalide photocatalyst has enough space to polarize the corresponding atoms and atomic orbitals. This induced dipole moment can effectively separate holes and electrons, while inhibiting the oxidation of holes, thus having good photostability. At the same time, the Sillen-Aurivillius phase layered structured bismuth-based oxyhalide photocatalyst has a large visible light response range, a small bandgap width, a low photogenerated electron-hole recombination rate, and a high visible light response performance.

[0043] Furthermore, Bi6FeTi2O 14 Cl is prepared by a molten salt method, using a stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOCl=5:4:1:2 to weigh and mix; adding cesium chloride and sodium chloride molten salt in a molten salt ratio of 1:1, grinding and calcining in sequence to obtain a crude product. The calcination temperature is 500-750°C and the calcination time is 10-14 hours. The molten salt preparation method also includes grinding, washing and drying the product obtained after calcination to obtain a bismuth-based chloride oxide photocatalyst. Figure 3 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 X-ray photoelectron spectroscopy (XPS) of Cl; Figure 4 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 Schematic diagram of the effect of Cl on the removal of Triphenyl Blue (TB). Figure 3 As shown, Bi6FeTi2O 14 The diffraction peak of the X-ray photoelectron spectrum of Cl is relatively sharp, and the cleanliness is relatively high. Figure 4 As shown, the prepared bismuth-based chloride oxide photocatalyst was placed in a solution containing triphenyl blue (TB). After irradiation with sunlight for 120 minutes, the concentration of TB was reduced by 98%. It can be seen that the bismuth-based chloride oxide photocatalyst has a good degradation effect on antibiotics.

[0044] According to one embodiment of the present disclosure, raw materials are weighed and mixed in a stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOCl=5:4:1:2, and then cesium chloride and sodium chloride are added in a ratio of 1:1 and mixed and ground thoroughly, and then placed in a muffle furnace and calcined at a temperature of 750°C for 12 hours. The product is then taken out, further ground and washed with water to remove mixed molten salt impurities, and the washed product is placed in an oven and dried at 60°C for 12 hours to finally obtain Bi6FeTi2O 14 Cl photocatalyst.

[0045] The raw materials were weighed and mixed thoroughly in a stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOCl=5:4:1:2, 10 mmol of barium carbonate and 10 mmol of bismuth oxychloride were weighed, and 15 mmol of potassium chloride and sodium chloride were added in a 1:1 ratio, respectively, and then the mixture was fully ground. Then, the mixture was placed in a muffle furnace and calcined at 700°C for 2 hours. The product was then taken out, further ground and washed with water to remove the mixed molten salt impurities, and the washed product was placed in an oven and dried at 60°C for 12 hours to finally obtain BaBi4TiNbO 11 Cl photocatalyst.

[0046] Weigh 100 kg of ground Bi6FeTi2O 14 Cl, add 100mL of TB mixed solution, in which the molar concentration of TB is 5㎎ / L, and stir in a dark room for 30min. Use a xenon lamp to simulate visible light for irradiation, and use a filter to filter ultraviolet light below 420nm, where the light source is 10cm above the surface of the TB mixed solution. Every 15min, measure 4mL of TB mixed solution and irradiate the solution with a xenon lamp, and separate the solution from the powder by centrifugation. Finally, the absorption spectrum of the solution after catalytic degradation is measured under a UV-visible spectrophotometer. After 120min of xenon lamp irradiation, the TB concentration is reduced by 98%.

[0047] According to another embodiment of the present disclosure, the raw materials are weighed and fully mixed in a stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOBr=5:4:1:2, 10 mmol of barium carbonate and 10 mmol of bismuth oxychloride are weighed, and then 15 mmol of potassium chloride and sodium chloride are added in a 1:1 ratio, mixed and fully ground, and then placed in a muffle furnace, calcined at a temperature of 700°C, and calcined for 2 hours, then the product is taken out, further ground and washed with water to remove mixed molten salt impurities, and the washed product is placed in an oven and dried for 12 hours to finally obtain Bi6FeTi2O 14 Br photocatalyst. It is used in the photocatalytic degradation of organic pollutants Rhodamine B (Rh B). Figure 5 The schematic diagram shows the photocatalyst Bi6FeTi2O in one embodiment of the present disclosure. 14 Schematic diagram of the effect of X (X = Br, I) on the removal of Rhodamine B (Rh B), where (a) is a schematic diagram of the effect of two photocatalysts on the removal of Rhodamine B; (b) is the logarithm of the corresponding value in (a). Figure 5 As shown in (a) and (b), Bi6FeTi2O 14 Cl has a better degradation effect on RhB.

[0048] According to an embodiment of the present disclosure, the condensation reflux unit includes a condensation device and a recovery container, and the recovery container is connected to the photocatalytic degradation unit through the condensation device. The purified water obtained after the sewage containing antibiotics is degraded by the photocatalyst begins to evaporate when heated, and is collected by the condensation reflux unit to finally obtain a purified water resource that can be reused.

[0049] According to an embodiment of the present disclosure, a thermometer may be added to the photocatalytic degradation unit as needed to monitor the temperature in real time.

[0050] Figure 6 A schematic diagram of a method for treating water using a solar-driven photocatalytic water purification device according to an embodiment of the present disclosure is shown. Figure 6 As shown, the method of using a solar-driven photocatalytic water purification device for treatment includes S601-S603.

[0051] In operation S601, the solar cell panel absorbs solar energy and performs photoelectric conversion, and stores electrical energy through an electrical energy storage unit.

[0052] In operation S602, a heating body is placed in sewage, and a photocatalyst is added to degrade the sewage under sunlight.

[0053] In operation S603, the degraded water is heated and distilled by the heated body under the action of electric energy, and the water vapor obtained by the heating and distillation is condensed and recovered to obtain distilled water.

[0054] According to an embodiment of the present disclosure, the above steps S601-S603 couple the solar energy absorption unit, the electric energy storage unit, the photocatalytic degradation unit and the photocatalytic degradation unit together, which can more effectively utilize solar energy and purify sewage.

[0055] According to an embodiment of the present disclosure, there is also provided an application of a solar-driven photocatalytic water purification device in water pollution treatment.

[0056] In the embodiments of the present disclosure, for example, Bi6FeTi2O 14 Cl is used as a degradation agent to remove antibiotic residues such as TB and TC in sewage. While synergistically utilizing solar energy resources, it can also achieve water environment management, which has great economic potential and environmental benefits.

[0057] In the embodiments of the present disclosure, Bi6FeTi2O prepared by the method of the present disclosure 14 Cl can catalyze the degradation of antibiotic TB, and its degradation efficiency can reach 98%.

[0058] Specifically, the solar panel is connected to a digital voltmeter and a control switch through a circuit board, and then connected to a rechargeable battery and a ceramic heater through the circuit board. The output power of the solar panel is 150W, and a metal resistance wire is built into the ceramic heater.

[0059] Continue as Figure 1 As shown, a three-necked flask can be used as needed, 3000-10000 mL of sewage can be poured into the three-necked flask, wherein the main connection port in the three-necked flask is connected to the condenser, and the side connection ports are used to immerse the heating body in the sewage, and the photocatalyst Bi6FeTi2O is added through another side connection port. 14 Cl is about 2 g. A three-necked flask is connected to the other end of the condenser. After 12 hours, about 1500~2000 mL of distilled water is collected.

[0060] In summary, the water purification treatment device of the above embodiment of the present disclosure purifies sewage and obtains pure water in harsh environments with power shortages such as remote mountainous areas and deserts through the coordinated use of solar energy, energy storage batteries, heating bodies and photocatalysts, thereby realizing the recycling of water resources. The above water purification treatment device has a simple manufacturing process and is easy to recycle and can be recycled, which is in line with the concept of green development; the bismuth-based oxyhalide photocatalyst involved in the water purification treatment device of the present disclosure has a good photocatalytic degradation effect on antibiotics.

[0061] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A solar-driven photocatalytic water purification device, comprising: A solar energy absorption unit for converting absorbed solar energy into electrical energy; An electric energy storage unit, used for storing the electric energy; A photocatalytic degradation unit, comprising a heating body and a photocatalyst, wherein the heating body is used to heat and distill the sewage using the electrical energy; The photocatalyst is used to degrade sewage under sunlight; as well as Condensation reflux unit, used to condense and recover distilled water.

2. The device according to claim 1, wherein: The heating body includes at least one of a ceramic heating body, a glass heating body, and a quartz heating body. Preferably, the heating body is a ceramic heating body.

3. The device according to claim 1 or 2, wherein: The catalyst includes at least one of a bismuth-based oxyhalide photocatalyst or a perovskite photocatalyst.

4. The device according to claim 3, wherein: The catalyst is a bismuth-based oxyhalide photocatalyst, and the structural formula of the bismuth-based oxyhalide photocatalyst is: Bi n+3 Fe n-2 TiO 3n+5 X, (X = Cl, Br and I), where 3 ≤ n ≤ 5, Preferably, the structural formula of the bismuth-based oxyhalide photocatalyst is Bi6FeTi2O 14 Cl.

5. The device according to claim 1, wherein the solar energy absorption unit comprises: The solar cell panel is used for absorbing light, and the output power of the solar cell panel is 50W-1000W.

6. The device according to claim 1, wherein the electrical energy storage unit comprises: A rechargeable battery includes at least one of a button cell, a cylindrical cell or a flow cell.

7. The device according to claim 1, wherein: The condensation reflux unit comprises a condensation device and a recovery container, and the recovery container is connected to the photocatalytic degradation unit through the condensation device.

8. The device according to claim 4, wherein: Bi6FeTi2O 14 Cl was prepared by molten salt method, using the stoichiometric ratio of Bi2O3:TiO2:Fe2O3:BiOCl=5:4:1:2 to weigh and mix; Cesium chloride and sodium chloride molten salt are added in a molten salt ratio of 1:1, and grinding and calcination are performed in sequence, wherein the calcination temperature is 500-750° C. and the calcination time is 10-14 hours.

9. A method using the device according to any one of claims 1 to 8, comprising: The solar cell panel absorbs solar energy and performs photoelectric conversion, and stores electric energy through the electric energy storage unit; Placing the heating body in sewage, adding the photocatalyst, and degrading the sewage under sunlight; The heating body is used to heat and distill the degraded water under the action of electric energy, and the water vapor obtained by the heating and distillation is condensed and recovered to obtain distilled water.

10. Use of the device according to any one of claims 1 to 8 in water pollution treatment.

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