A rapid purification device for field sewage, its water purification board and manufacturing method

Abstract

A rapid purification device for field sewage, its water purification plate and manufacturing method. The device includes a bracket, a water purification plate and a water collection mechanism installed on the bracket. The water collection mechanism is installed on the water purification plate and is inclined relative to the water purification plate. The water purification plate is a coated micro-textured aluminum plate. The surface of the coated micro-textured aluminum plate is evenly distributed with open periodic wavy micro-structured grooves. The micro-structured grooves longitudinally penetrate the entire surface of the coated micro-textured aluminum plate along the length direction of the coated micro-textured aluminum plate. Each micro-structured groove is periodically ordered in a wavy shape along the length direction. The surface of the coated micro-textured aluminum plate is coated with a photocatalytic antibacterial TiO2 / CuOx composite film. The present invention also discloses a preparation method of the water purification plate. It realizes long-term and reusable water purification and can provide safe and reliable drinking water for the survival of field operators in arid areas.

Description

Technical Field

[0001] The present invention relates to environmental protection and energy-saving technologies, in particular to a rapid purification device for field sewage, a water purification plate thereof, and a manufacturing method therefor. Background Art

[0002] During field operations in arid regions, sufficient and safe drinking water is a prerequisite and an important guarantee for ensuring that operators complete their tasks. Purifying field water sources through filtration, sedimentation, boiling, etc. is a common strategy when water reserves are insufficient. However, when facing water pollution (such as heavy metals, microbial pathogens), water scarcity, etc., conventional water intake and purification measures cannot meet the requirements of operators for water quantity, water quality, and equipment portability, affecting field operations and even endangering the lives of operators. Therefore, efficient and convenient water purification and intake are prerequisites for the smooth conduct of field operations.

[0003] Existing portable water intake and purification devices are often designed and manufactured based on filter element filtration and high-temperature disinfection methods. Such devices are heavy and complex to install. Especially in water-scarce and poor field environments, they have the disadvantages of requiring a large amount of water and being unable to completely remove heavy metal pollution in water, and can no longer meet the demand for reliable and safe drinking water.

[0004] Using solar evaporation distillation to produce water can completely and effectively eliminate pollutants such as microbial pathogens, heavy metals, and minerals in water, which is an economical and environmentally friendly water production solution. However, existing solar thermal evaporation systems first need to take water and then purify it. The heat source and water source are separated, resulting in large heat losses and low efficiency; using the siphon effect of microporous materials and interfacial endothermic distillation to produce water has defects such as the closed water delivery capillary tubes being easily blocked, worn, and corroded, the device being complex and not suitable for water-scarce environments, and high maintenance costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a rapid purification device for field sewage, a water purification plate thereof, and a manufacturing method therefor, which are sustainable, recyclable, highly efficient, lightweight and portable, and can completely remove heavy metal pollutants in water, aiming at the above-mentioned defects of the prior art.

[0006] To achieve the above object, the present invention provides a water purification plate, wherein the water purification plate is a coated micro-textured aluminum plate, and the surface of the coated micro-textured aluminum plate is evenly distributed with open periodic wavy micro-structured grooves. The micro-structured grooves longitudinally penetrate the entire surface of the coated micro-textured aluminum plate along the length direction of the coated micro-textured aluminum plate, and each micro-structured groove is periodically ordered in a wavy shape along the length direction; the surface of the coated micro-textured aluminum plate is coated with a photocatalytic bactericidal TiO 2 / CuOx composite film.

[0007] The above-mentioned water purification plate, wherein the cross-section of the microstructural groove is rectangular, the groove width of the microstructural groove is 10-50 μm, the depth of the microstructural groove is 10-150 μm, and the interval between adjacent microstructural grooves is 30-100 μm.

[0008] The above-mentioned water purification plate, wherein the waveform of each microstructural groove is a sine wave, the wavelength of the sine wave is 20-300 μm, and the amplitude of the sine wave is 50-100 μm.

[0009] The above-mentioned water purification plate, wherein the 2 TiO 2 / CuOx composite film is a multi-layer modulated structure film, and each modulation period layer of the TiO 2 / CuOx composite film includes a TiO 2 coating layer of 10-20 nm stacked with a CuOx coating layer of 1-5 nm, and the total thickness of the coating layer of the TiO

[0010] / CuOx composite film is 100-300 nm.

[0011] In order to better achieve the above object, the present invention also provides a preparation method of a water purification plate, which includes the following steps:

[0012] S100. Prepare a coated micro-textured aluminum plate, and use femtosecond laser to process open periodic wavy microstructural grooves on a polished aluminum plate with a surface roughness less than 0.8 μm. The microstructural grooves longitudinally penetrate the entire surface of the coated micro-textured aluminum plate along the length direction of the coated micro-textured aluminum plate, and each microstructural groove is periodically ordered in a wavy shape along the length direction;

[0013] S200. Perform ultrasonic and Ar plasma treatment on the coated micro-textured aluminum plate obtained by femtosecond laser processing; and

[0014] S300. Use atomic layer deposition to prepare a photocatalytic TiO 2 / CuOx nano-multilayer composite film on the surface of the coated micro-textured aluminum plate and the inner surface of the microstructural grooves.

[0015] In the preparation method of the above-mentioned water purification plate, the process parameters of the femtosecond laser processing in step S100 are: power is 0.1-1 w, wavelength is 600-800 nm, repetition frequency is 1-10 kHz, and scanning rate is 100 μm / s-1000 μm / s.

[0016] In the preparation method of the above-mentioned water purification plate, in step S300, the TiO 2The TiO2 / CuOx nano-multilayer composite film comprises multiple layers of TiO2 2 and CuOx films. One layer of 1 - 5 nm CuOx film is alternately coated on one layer of 10 - 20 nm TiO2 2 film. The thickness of the TiO2 / CuOx nano-multilayer composite film is 100 - 300 nm. 2

[0017] In the preparation method of the above water purification plate, the process parameters of the atomic layer deposition are as follows: using titanium tetraisopropoxide, copper bis(dimethylamine - 2 - propanol), and hydrogen peroxide or water as precursors, the deposition temperature is 130 - 175 °C, the evaporation temperatures of titanium tetraisopropoxide and copper bis(dimethylamine - 2 - propanol) are 60 - 80 °C and 65 - 100 °C respectively, the pulse times of titanium tetraisopropoxide and copper bis(dimethylamine - 2 - propanol) are 0.1 - 0.5 s, with an interval of 1 - 10 s, and the purge time is 10 - 20 s; the pulse time of hydrogen peroxide or water is 0.1 - 0.5 s, and the purge time is 10 - 20 s; after each cycle of 10 - 20 nm TiO2 2 coating, a 1 - 5 nm CuOx coating is cycled, and the overall cycle reaches a thickness of 100 - 300 nm.

[0018] To better achieve the above object, the present invention also provides a field sewage rapid purification device, which includes a bracket and a water purification plate and a water collection mechanism installed on the bracket. The water collection mechanism is installed on the water purification plate and is inclined relative to the water purification plate, and the water purification plate is the above water purification plate.

[0019] In the above field sewage rapid purification device, the bracket is a foldable lightweight bracket for adjusting the angle and position of the water purification plate.

[0020] In the above field sewage rapid purification device, the water collection mechanism includes a condensation collection plate and a purified water collection box. The top end of the condensation collection plate is connected to the water purification plate and forms an angle with the water purification plate, and the purified water collection box is installed at the bottom end of the condensation collection plate.

[0021] In the above field sewage rapid purification device, the condensation collection plate is a high - light - transmittance lightweight organic glass plate.

[0022] The technical effect of the present invention is as follows:

[0023] ​The present invention realizes the rapid distillation and purification of water in water-scarce and poor field environments or even human urine through the surface micro-texturing forming combination and coating modification technology of lightweight materials such as aluminum alloy. Using solar heating, it can completely remove heavy metals and bacterial contamination in water, and achieve long-term reusable water purification, providing safe and reliable drinking water for the survival of field workers in arid areas. It has the characteristics of high efficiency, reusability, easy portability and transportation, low cost, and self-cleaning surface.

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but it is not limited to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic structural diagram of a rapid field sewage purification device according to an embodiment of the present invention;

[0026] Figure 2A Schematic structural diagram of a water purification plate according to an embodiment of the present invention;

[0027] Figure 2B is Figure 2A Cross-sectional view;

[0028] Figure 3 Schematic diagram of the preparation process of a coated micro-textured aluminum plate according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of an atomic layer deposition device according to an embodiment of the present invention;

[0030] Figure 5 Graph of the temperature change over time measured by rapid infrared light absorption imaging of a water purification plate according to an embodiment of the present invention.

[0031] Among them, the reference numerals

[0032] 1 Bracket

[0033] 2 Water purification plate

[0034] 21 Coated micro-textured aluminum plate

[0035] 22 Microstructure groove

[0036] 23 TiO 2 / CuOx composite film

[0037] 24 TiO 2 Coating

[0038] 25 CuOx coating

[0039] 3 Water collection mechanism

[0040] 31 Condensation collection plate

[0041] 32 Water purification collection box

[0042] 4 Atomic layer deposition equipment

[0043] 41 Vacuum chamber

[0044] 42 Mechanical pump

[0045] 43 Nitrogen gas source

[0046] 44 Oxygen source bottle

[0047] 45 Titanium source bottle

[0048] 46 Copper source bottle

[0049] 47 Pneumatic valve

[0050] 471 First ALD pneumatic valve

[0051] 472 Second ALD pneumatic valve

[0052] 473 Third ALD pneumatic valve

[0053] 474 Fourth ALD pneumatic valve

[0054] 475 Fifth ALD pneumatic valve

[0055] 5 Condensate water Detailed implementation manners

[0056] The structural principle and working principle of the present invention will be specifically described below with reference to the accompanying drawings:

[0057] The present invention uses femtosecond laser to prepare periodic wavy functional microgrooves with super core water absorption and light absorption effects on the surface of an aluminum plate. Then, on the inner and outer surfaces of the microgrooves of the aluminum plate, an oxide hard ceramic nano-multilayer functional film with photocatalytic antibacterial properties is uniformly prepared by means of low-temperature and high-conformity atomic layer vacuum vapor deposition technology. It is combined with a water collection mechanism to form a solar water purification device, which is suitable for drinking after purifying wild sewage. This wild sewage rapid purification device uses sunlight or artificial heat sources to completely purify wild poor water environments and excreted urine, etc. Under the condition of no sunlight, it can realize water purification by means of simulating solar light sources such as xenon lamp irradiation, providing guarantee for the supply of qualified drinking water for operators in wild and field water-scarce environments. The photocatalytic film layer has the characteristics of resisting microbial bacteria, acid-base corrosion and sediment abrasion, ensuring the cyclic service life of the aluminum plate.

[0058] See Figure 1 , Figure 1Schematic structural diagram of a rapid field sewage purification device according to an embodiment of the present invention. The rapid field sewage purification device of the present invention includes a bracket 1, a water purification plate 2 and a water collection mechanism 3 installed on the bracket 1. The water collection mechanism 3 is installed on the water purification plate 2 and is inclined relative to the water purification plate 2. The water purification plate 2 is used for heating and distilling to purify water. Among them, the bracket 1 is preferably a foldable lightweight bracket 1 for adjusting the angle and position of the water purification plate 2. The water collection mechanism 3 includes a condensation collection plate 31 and a purified water collection box 32. The top end of the condensation collection plate 31 is connected to the water purification plate 2 and forms an angle with the water purification plate 2. The purified water collection box 32 is installed at the bottom end of the condensation collection plate 31. The condensation collection plate 31 is preferably a high-transparency lightweight organic glass plate. Since the composition, structure, mutual positional relationship, connection relationship and working principle of other parts of the rapid field sewage purification device are all relatively mature existing technologies, they will not be elaborated here. Only the water purification plate 2 of the present invention and its preparation method will be described in detail below.

[0059] See Figure 2A and 2B , Figure 2A Schematic structural diagram of the water purification plate 2 according to an embodiment of the present invention, Figure 2B is Figure 2A cross-sectional view. The water purification plate 2 of the present invention, the water purification plate 2 is a coated micro-textured aluminum plate 21. The surface of the coated micro-textured aluminum plate 21 is evenly distributed with open periodic wavy micro-structured grooves 22. The micro-structured grooves 22 longitudinally penetrate the entire surface of the coated micro-textured aluminum plate 21 along the length direction of the coated micro-textured aluminum plate 21. Each micro-structured groove 22 is periodically ordered wavy along the length direction. The surface of the coated micro-textured aluminum plate 21 is coated with a photocatalytic antibacterial TiO 2 / CuOx composite film 23. Among them, the surface of the coated micro-textured aluminum plate 21 is black. The cross-section of the micro-structured groove 22 is rectangular. The groove width of the micro-structured groove 22 is 10-50 μm. The depth of the micro-structured groove 22 is 10-150 μm. The interval between adjacent micro-structured grooves 22 is 30-100 μm. The wavy shape of each micro-structured groove 22 is a sine wave. The wavelength of the sine wave is 20-300 μm. The amplitude of the sine wave is 50-100 μm.

[0060] In this embodiment, the TiO 2 / CuOx composite film 23 is a multi-layer modulation structure film. Each modulation period layer of the TiO 2 / CuOx composite film 23 includes a TiO 2 coating layer 24 of 10-20 nm stacked with a CuOx coating layer 25 of 1-5 nm. The TiO 2The total thickness of the coating of the TiO₂ / CuOx composite film 23 is 100 - 300 nm.

[0061] See Figure 3 , Figure 3 which is a schematic diagram of the preparation process of the coated micro-textured aluminum plate 21 according to an embodiment of the present invention. The preparation method of the water purification plate 2 of the present invention includes the following steps:

[0062] Step S100, preparing the coated micro-textured aluminum plate 21, and using femtosecond laser etching to process an open periodic wavy micro-structured groove 22 on a polished aluminum plate with a surface roughness less than 0.8 μm. The micro-structured groove 22 longitudinally penetrates the entire surface of the coated micro-textured aluminum plate 21 along the length direction of the coated micro-textured aluminum plate 21, and each micro-structured groove 22 is periodically ordered in a wavy shape along the length direction; a 200 mm × 300 mm aluminum plate can be polished with a polishing wheel and polishing powder to obtain a mirror-polished aluminum alloy panel;

[0063] Step S200, performing ultrasonic and Ar plasma cleaning on the coated micro-textured aluminum plate 21 obtained by femtosecond laser processing. The polished aluminum plate can be put into an industrial ultrasonic cleaner and cleaned with alcohol as the cleaning agent, and then dried after 10 minutes of cleaning; preferably, the argon inlet pressure of the plasma cleaning gun is 0.05 MPa - 0.15 MPa, and the treatment time is 10 - 20 minutes; and

[0064] Step S300, using atomic layer deposition to prepare a photocatalytic oxide hard ceramic coating TiO₂ 2 / CuOx nano-multilayer composite film on the surface of the coated micro-textured aluminum plate 21 and the inner surface of the micro-structured groove 22 obtained by plasma cleaning. The TiO₂ 2 / CuOx nano-multilayer composite film has antibacterial, corrosion-resistant and wear-resistant properties.

[0065] Among them, the process parameters of femtosecond laser direct writing in step S100 are: processing micro-groove textures with a groove width of 10 - 50 μm, a depth of 10 - 150 μm, and a groove interval of 30 - 100 μm on the surface of the polished aluminum plate. The micro-grooves penetrate the entire aluminum plate plane in a wavy shape along the length direction, with a power of 0.1 - 1 w, a wavelength of 600 - 800 nm, a repetition frequency of 1 - 10 kHz, and a scanning rate of 100 μm / s - 1000 μm / s.

[0066] In step S300, the TiO₂ 2 / CuOx nano-multilayer composite film prepared by atomic layer deposition includes multiple layers of TiO₂ 2 and CuOx films, alternately covering a 10 - 20 nm TiO₂ 2 film with a 1 - 5 nm CuOx film. The TiO₂2 The thickness of the TiO₂ / CuOx nano-multilayer composite film is 100 - 300 nm. The process parameters of the atomic layer deposition are as follows: using titanium tetraisopropoxide, copper bis(dimethylamine-2-propanol), and hydrogen peroxide or water as precursors, the deposition temperature is 130 - 175 °C, the evaporation temperatures of titanium tetraisopropoxide and copper bis(dimethylamine-2-propanol) are 60 - 80 °C and 65 - 100 °C respectively, the pulse times of titanium tetraisopropoxide and copper bis(dimethylamine-2-propanol) are 0.1 - 0.5 s, with an interval of 1 - 10 s, and the purge time is 10 - 20 s; the pulse time of hydrogen peroxide or water is 0.1 - 0.5 s, and the purge time is 10 - 20 s; each TiO₂ 2 / CuOx periodic layer consists of a TiO₂ layer with a thickness of 10 - 20 nm and a CuOx layer with a thickness of 1 - 5 nm. For every 10 - 20 nm of TiO₂ coating 24, a 1 - 5 nm CuOx coating 25 is cycled, and the overall cycling is carried out until the total thickness of the coating reaches 100 - 300 nm. 2 2

[0067] The femtosecond laser process parameters in this embodiment are set as follows: power: 0.45 W, wavelength: 700 nm, frequency: 1 kHz. After being focused by a 10× objective lens, an aluminum plate is etched and polished at a rate of 500 μm / s with an interval of 100 μm to etch a periodic micro-groove structure on the polished aluminum plate. The groove width prepared under this parameter is 13.8 μm, the depth is 54.9 μm, and the groove length direction is processed in a sine wave form with a wavelength of 100 μm and an amplitude of 50 μm. The aluminum alloy panel after femtosecond laser etching is put into an industrial ultrasonic cleaner and cleaned with alcohol. After cleaning for 10 min, it is dried. The aluminum plate with such wavy periodic grooves has a rapid heat absorption effect. The results of the photo-thermal test are as Figure 5 shown, Figure 5 This is a graph showing the change of temperature with time measured by infrared light rapid heat absorption imaging for the water purification plate in an embodiment of the present invention.

[0068] The coated micro-textured aluminum plate 21 of the present invention has a black surface and has super light absorption performance. The micro-structured groove 22 structure can achieve super-capillary absorption performance. Since the angle and position can be adjusted arbitrarily, the absorption efficiency and evaporation efficiency of sunlight are improved; because it is coated with a TiO₂ / CuOx composite film 23 with photocatalytic antibacterial properties, the antibacterial, corrosion, and wear resistance are improved, thereby improving the long-term usability; the coated micro-textured aluminum plate 21 can be integrated with the water collection mechanism 3 and the foldable lightweight bracket 1 to form a solar field sewage rapid purification device. Using solar heating, it is applicable to water-scarce and poor water environments in the wild and can completely remove heavy metals and pollutants in water. 2

[0069] See Figure 4 Figure 4 ​​​​Schematic diagram of an atomic layer deposition apparatus 4 according to an embodiment of the present invention. The atomic layer deposition apparatus 4 includes a vacuum chamber 41, a mechanical pump 42, a nitrogen gas source 43, an oxygen source bottle 44, a titanium source bottle 45, a copper source bottle 46, and a plurality of pneumatic valves 47. In this embodiment, titanium isopropoxide is used as the titanium source precursor, copper bis(dimethylamine-2-propanol) is used as the copper source precursor, hydrogen peroxide is used as the oxygen source, and nitrogen is used as the purge gas during the atomic layer deposition process cycle. The micro-textured aluminum plate after ultrasonic cleaning is subjected to argon plasma cleaning, the argon inlet pressure is 0.1 MPa, and the treatment time is 10 min; the laser micro-machined pattern aluminum plate after argon plasma cleaning is placed in the vacuum chamber 41; the process parameters are set: the evaporation temperature of the titanium precursor is 65 °C, the evaporation temperature of the copper precursor is 90 °C, the deposition temperature is 150 °C, and different pneumatic valves 47 control different precursors. The titanium source bottle 45 of the titanium precursor is controlled by the first ALD pneumatic valve 471 and the second ALD pneumatic valve 472, the oxygen source bottle 44 of hydrogen peroxide is controlled by the third ALD pneumatic valve 473, and the copper source bottle 46 of the copper precursor is controlled by the fourth ALD pneumatic valve 474 and the fifth ALD pneumatic valve 475. The preparation process is as follows:

[0070] Deposit a single cycle of TiO 2 / CuOx nano-multilayer modulated film. First, open the first ALD pneumatic valve 471 for 0.5 s, with an interval of 1 s, then open the second ALD pneumatic valve 472 and inject the precursor for 0.5 s; purge with nitrogen for 12 s and restore to the original pressure; open the third ALD pneumatic valve 473 and inject the oxygen source for 0.1 s; purge with nitrogen for 12 s and restore to the original pressure, and repeat 20 times. Then open the fourth ALD pneumatic valve 474 for 0.5 s, with an interval of 1 s, open the fifth ALD pneumatic valve 475 and inject the precursor for 0.5 s; purge with nitrogen for 12 s and restore to the original pressure; open the third ALD pneumatic valve 473 and inject the oxygen source for 0.1 s; purge with nitrogen for 12 s and restore to the original pressure, and repeat 2 times. The above steps are a preparation cycle for a TiO 2 / CuOx modulated periodic layer, and repeat 300 times.

[0071] The coated micro-textured aluminum plate 21 prepared by the above method is used as a water purification plate 2 for distilling water. It is connected to a condensation collection plate 31, a water purification collection box 32, and a foldable lightweight bracket 1 by a snap-fastening structure to form a field sewage rapid purification device. Among them, the condensation collection plate 31 is placed obliquely above the water purification plate 2, and one end of the water purification plate 2 is immersed below the liquid surface, so that the unpurified water can be transported to the surface of the water purification plate 2 that can be installed at any angle through capillary force. Due to the super light absorption and heat capacity, the coated micro-textured aluminum plate 21 heats the water on its surface through solar energy. The evaporated water vapor meets the inclined plexiglass condensation collection plate 31 above to form condensed water 5, which flows into the water collection box after cooling.

[0072] The present invention utilizes the full solar spectrum. Under the condition of no sunlight, simulated solar light sources such as xenon lamp irradiation can be adopted, and sewage is purified through the process of light-thermal-evaporation, belonging to an energy-saving and environmental-friendly green water purification technology, with advantages such as reusable, easy to carry and transport, and low cost. A micro-nano structure is set on the aluminum plate surface, and is precisely prepared and formed by femtosecond laser with extremely low thermal effect, making it have both superhydrophilicity and rapid water absorption, as well as super light absorption, and then the heat of solar energy can be utilized to evaporate water to achieve sewage purification. Absorbing sewage, absorbing sunlight and water evaporation occur on the same surface, significantly improving the evaporation efficiency. On the surface of the textured aluminum plate, a copper-doped nano-titanium dioxide photocatalytic thin film with superhydrophilicity, visible light transparency and self-cleaning effect at the nano-scale is prepared by atomic layer deposition technology (ALD), having a certain surface self-cleaning ability and hydrophilic stability. The water on the superhydrophilic-super light-absorbing aluminum plate surface is in a special physical and chemical state, having a relatively high evaporation rate. By adjusting the angle of the coated micro-textured aluminum plate 21, the irradiation flux of sunlight can be conveniently adjusted to control the evaporation and water treatment rates. It is applicable to water environments and conditions such as water-scarce, sewage, and even human urine, having the advantages of light weight, corrosion resistance, bacteriostasis, and anti-fouling, being able to continuously and rapidly absorb water and efficiently evaporate and distill pure water, providing guarantee for the major demand of supplying qualified drinking water for operators in water-scarce field and field operation environments.

[0073] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A rapid purification device for field sewage, characterized in that, Applicable to the field with little water and poor water environment, including a bracket, a water purification plate and a water collection mechanism mounted on the bracket. The water collection mechanism is mounted on the water purification plate and is inclined relative to the water purification plate, and unpurified water is transported to the surface of the water purification plate that can be installed at any angle through capillary force. The water purification plate is a coated micro-textured aluminum plate precisely prepared by femtosecond laser. The surface of the coated micro-textured aluminum plate is black, and is evenly distributed with open periodic wavy micro-structured grooves. The micro-structured grooves longitudinally penetrate the entire surface of the coated micro-textured aluminum plate along the length direction of the coated micro-textured aluminum plate, and each micro-structured groove is periodically ordered wavy along the length direction; the surface of the coated micro-textured aluminum plate is coated with a photocatalytic bactericidal TiO 2 / CuOx composite film; The TiO 2 / CuOx composite film is a multi-layer modulated structure film with superhydrophilicity at the nanoscale, transparency in the visible light region, and self-cleaning function, prepared by atomic layer vacuum vapor deposition. The TiO 2 / CuOx composite film per modulation period layer includes a 10-20 nm TiO 2 coating layer stacked with a 1-5 nm CuOx coating layer. The total thickness of the coating layer of the TiO 2 / CuOx composite film is 100-300 nm; the coated micro-textured aluminum plate utilizes the full solar spectrum to purify sewage through a light-thermal-evaporation process, has superhydrophilicity, rapid water absorbency and super light absorbency, and sewage absorption, sunlight absorption and water evaporation occur on the same surface; wherein, the cross-section of the microstructural groove is rectangular, the groove width of the microstructural groove is 10-50 µm, the depth of the microstructural groove is 10-150 µm, and the interval between adjacent microstructural grooves is 30-100 µm; the wavy shape of each microstructural groove is a sine wave, the wavelength of the sine wave is 20-300 µm, and the amplitude of the sine wave is 50-100 µm; the water on the surface of the water purification plate is heated and evaporated by solar energy to completely remove heavy metals and pollutants in the water.

2. The rapid purification device for field sewage according to claim 1, characterized in that, the water purification plate is prepared by the following method, including: S100. Prepare a coated micro-textured aluminum plate, and use femtosecond laser to process open periodic wavy microstructural grooves on a polished aluminum plate with a surface roughness less than 0.8 µm. The microstructural grooves longitudinally penetrate the surface of the entire coated micro-textured aluminum plate along the length direction of the coated micro-textured aluminum plate, and each microstructural groove is periodically ordered in a wavy shape along the length direction; the cross-section of the microstructural groove is rectangular, the groove width of the microstructural groove is 10-50 µm, the depth of the microstructural groove is 10-150 µm, and the interval between adjacent microstructural grooves is 30-100 µm; the wavy shape of each microstructural groove is a sine wave, the wavelength of the sine wave is 20-300 µm, and the amplitude of the sine wave is 50-100 µm; S200. Perform ultrasonic and Ar plasma treatment on the coated micro-textured aluminum plate obtained by femtosecond laser processing; and S300. Prepare a photocatalytic TiO 2 / CuOx nano-multilayer composite film on the surface of the coated micro-textured aluminum plate and the inner surface of the microstructural grooves. 2 / CuOx nano-multilayer composite film.

3. The rapid purification device for field sewage according to claim 2, characterized in that, the process parameters of femtosecond laser processing in step S100 are: power is 0.1-1 w, wavelength is 600-800 nm, repetition frequency is 1-10 kHz, and scanning rate is 100 µm / s - 1000 µm / s.

4. The rapid purification device for field sewage according to claim 2 or 3, characterized in that, In step S300, the TiO 2 / CuOx nano-multilayer composite film prepared by atomic layer deposition includes multiple layers of TiO 2 and CuOx films, and a 1-5 nm CuOx film is alternately coated on a 10-20 nm TiO 2 film. The thickness of the TiO 2 / CuOx nano-multilayer composite film is 100-300 nm.

5. The rapid purification device for field sewage according to claim 4, characterized in that, The process parameters of the atomic layer deposition are as follows: using titanium isopropoxide, copper bis(dimethylamine-2-propanol), and hydrogen peroxide or water as precursors, the deposition temperature is 130-175 °C, the evaporation temperatures of titanium isopropoxide and copper bis(dimethylamine-2-propanol) are 60-80 °C and 65-100 °C respectively, the pulse times of titanium isopropoxide and copper bis(dimethylamine-2-propanol) are 0.1-0.5 s, with an interval of 1-10 s, and the purge time is 10-20 s; the pulse time of hydrogen peroxide or water is 0.1-0.5 s, and the purge time is 10-20 s; each cycle deposits a TiO 2 coating with a thickness of 10-20 nm, and after each cycle, a CuOx coating with a thickness of 1-5 nm is deposited, and the overall cycle is carried out until the thickness reaches 100-300 nm.

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