CN115745050A - Photo-thermal evaporation and photocatalysis synergistic sewage treatment material and preparation method thereof - Google Patents
Photo-thermal evaporation and photocatalysis synergistic sewage treatment material and preparation method thereof Download PDFInfo
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- CN115745050A CN115745050A CN202211482790.2A CN202211482790A CN115745050A CN 115745050 A CN115745050 A CN 115745050A CN 202211482790 A CN202211482790 A CN 202211482790A CN 115745050 A CN115745050 A CN 115745050A
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Abstract
The invention provides a sewage treatment material with cooperation of photothermal evaporation and photocatalysis. The sewage treatment material is delignified wood and comprises an upper photo-thermal layer and a lower photo-catalytic layer, the upper photo-thermal layer is a carbonized layer subjected to surface carbonization treatment, and the lower photo-catalytic layer is loaded with a photocatalytic degradation material. The material greatly improves the efficiency of photo-thermal water evaporation and photocatalysis through the synergistic effect between the photo-thermal layer and the photo-catalytic layer. When the organic pollutants are degraded to enable the wastewater to reach the discharge standard, clean distilled water can be obtained, the wastewater discharge amount is reduced, the concentration, the recovery and the reutilization of valuable components in the wastewater are realized, the printing and dyeing wastewater treatment cost is effectively reduced, and the wastewater treatment efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a sewage treatment material with cooperation of photothermal evaporation and photocatalysis and a preparation method thereof.
Background
Water resources are the most important natural resources for human beings, and with the development of human society, more and more countries and regions face the problem of shortage of fresh water resources. Industrial production activities not only consume a large amount of water, but also produce industrial wastewater containing organic pollutants, thereby aggravating water resource shortage and causing serious pollution, and threatening ecological environment safety and human health. Among them, the wastewater discharged from the printing and dyeing industry often contains high-concentration organic pollutants, has high chromaticity, complex components and poor biodegradability, so that the adsorption method and the biological method in the traditional wastewater treatment have unsatisfactory effect on the printing and dyeing wastewater treatment. With the tightening of the national environmental protection policy, each standard provides new and stricter requirements for the quality and quantity of the discharged wastewater, and the difficulty of wastewater treatment is further increased.
The photocatalytic oxidation technology is used as a sustainable wastewater treatment technology which is environment-friendly and low in energy consumption, has high catalytic oxidation activity, and can degrade organic pollutants in water in a nonselective manner, so that the photocatalytic oxidation technology has a good application prospect in the field of printing and dyeing wastewater treatment. However, other components in the wastewater, such as oils, acids, alkalis, inorganic salts, and heavy metal ions, are difficult to remove by catalytic degradation, and remain in the photodegraded wastewater in a large amount. Meanwhile, the application of the photocatalytic degradation technology in wastewater treatment is also influenced by the problems of high cost, difficult recycling and the like of the photocatalyst.
The light hot water evaporation technology is used as a novel clean water resource acquisition technology, and interface evaporation can be realized by utilizing solar photo-thermal conversion, so that the obtained clean distilled water has potential application prospect in the field of wastewater treatment. The synergistic effect of photocatalytic degradation and photothermal evaporation is applied to wastewater treatment, so that pollutants can be degraded, the environmental pollution is reduced, clean water resources can be obtained, the wastewater discharge amount is reduced, and the recovery and utilization of printing and dyeing wastewater are effectively realized.
At present, the reports of combining the two methods are few, and the photo-thermal conversion characteristics of the materials are mostly utilized to improve the photo-catalytic performance. For example, fan et al self-assemble Ag-AgCl/WO layer by layer 3 /g-C 3 N 4 The nanoparticles are assembled on dopamine modified melamine sponge, the photothermal conversion effect of dopamine and the photocatalytic activity of the nanoparticles are combined, and the high-efficiency degradation of trimethoprim in sewage is realized (A)CS appl. Mater. Interfaces,2021,13, 31066-31076). However, the above method only improves the degradation efficiency of sewage, does not realize the synergistic effect of photocatalytic degradation and photothermal water evaporation, and cannot effectively realize the goals of efficient water treatment, wastewater reduction and the like.
Disclosure of Invention
In view of the above-mentioned prior art problems, a primary object of the present invention is to provide a sewage treatment material with photo-thermal evaporation and photocatalysis synergistic, which includes a photo-thermal layer and a photo-catalytic layer, and through the synergistic effect between the photo-thermal layer and the photo-catalytic layer, the photo-thermal water evaporation efficiency and the photo-catalytic efficiency are greatly improved, and when organic pollutants are degraded to make wastewater reach the emission standard, clean distilled water can be obtained, the wastewater discharge amount is reduced, the concentration, recovery and reuse of valuable components in the wastewater are realized, the treatment cost of printing and dyeing wastewater is effectively reduced, and the wastewater treatment efficiency is improved.
The second purpose of the invention is to provide a preparation method of the sewage treatment material by combining photothermal evaporation and photocatalysis.
The third purpose of the invention is to provide the application of the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis in photocatalytic degradation and/or photothermal water evaporation.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a sewage treatment material of light and heat evaporation and photocatalysis synergism, sewage treatment material is delignification timber, includes upper photothermal layer and lower floor's photocatalysis layer, upper photothermal layer is the carbonization layer through surface carbonization treatment, lower floor's photocatalysis layer load has the photocatalytic degradation material.
The invention provides a sewage treatment material with photo-thermal evaporation and photocatalysis synergistic effect, which adopts natural wood as a carrier after delignification modification, and takes the surface layer as a photo-thermal layer after carbonization treatment; the lower layer is loaded with photocatalytic degradation materials and used as a photocatalytic layer to construct a double-layer photo-thermal-photocatalytic coupling sewage treatment device. The photo-thermal layer and the photo-catalytic layer have excellent synergistic effect, and photo-thermal water evaporation efficiency and photo-catalytic degradation efficiency are greatly improved. More specifically, the lower photocatalytic layer can effectively increase the water evaporation rate of the upper photocatalytic layer: the double-layer structure provided by the invention has Janus characteristics of hydrophobic upper layer and hydrophilic lower layer, and the lower hydrophilic wood pore channel can be continuously transported to an evaporation interface in the process of interface solar water evaporation, so that the photo-thermal water evaporation efficiency is improved. And the upper photo-thermal layer can effectively improve the photocatalytic degradation rate of the lower photo-catalytic layer: the existence of the upper photo-thermal layer can increase the local temperature, further improve the photo-catalytic activity and accelerate the reaction rate; in addition, because the solution is driven to flow upwards in the evaporation process, pollutants are enriched at the bottom of the device, and the catalytic efficiency is further increased. The invention can obtain clean distilled water while degrading organic pollutants to ensure that the wastewater reaches the discharge standard, reduce the discharge amount of the wastewater, realize the concentration, recovery and reutilization of valuable components in the wastewater, effectively reduce the treatment cost of the printing and dyeing wastewater and improve the efficiency of wastewater treatment.
Preferably, the carbonized layer has a thickness of 10 to 50%. The thickness of the upper carbonization layer has certain influence on the photo-thermal water evaporation efficiency and the photo-catalytic efficiency. In the present invention, wood having a thickness of 5 to 10mm is generally selected. When the thickness of the wood is 5mm, the thickness of the carbonization zone is 0.5-2.5 mm; when the thickness of the wood is 10mm, the thickness of the carbonization zone accounts for 1-5 mm.
Preferably, the load of the photocatalytic degradation material is 5-13.5 wt%. Specifically, the load amount is the mass ratio of the photocatalytic degradation material to the wood.
Further preferably, the thickness of the carbonized layer accounts for 10-40%; the load capacity of the photocatalytic degradation material is 10-13.5 wt%. Within this preferred range, the upper photothermal layer has a water evaporation rate greater than 1.7 kg/(m) 2 H); the photodegradation efficiency of the lower photocatalytic layer is higher than 98%.
Preferably, the photocatalytic degradation material is FeOOH nanoparticles.
Further preferably, the FeOOH nanoparticles are β -FeOOH nanoparticles.
In addition, the invention also discloses a preparation method of the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis, which comprises the following steps:
s1, carbonizing delignified wood to form delignified wood with a carbonized layer at the upper layer;
s2, placing the delignified wood with the upper layer being a carbonized layer in an iron salt solution to enable the carbonized layer to face upwards, adjusting the pH value of the iron salt solution to be acidic, heating the delignified wood with water in a water bath at the temperature of 40-90 ℃ to load FeOOH nano-particles generated by hydrolysis in a pore canal of the lower layer wood which is not carbonized, cleaning and drying to obtain the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis.
Preferably, in step S1, the carbonization treatment is: heating the delignified wood for 8-45 s at 250-550 ℃.
Further preferably, in step S1, the carbonization treatment is: heating the delignified wood for 15 to 30 seconds at the temperature of between 250 and 550 ℃.
Preferably, in the step S2, the ferric salt solution is a ferric chloride solution, and the concentration of the ferric chloride solution is 0.01mol/L.
Preferably, in the step S2, after the delignified wood is placed in the iron salt solution, the time for the iron salt solution to enter the pores of the wood may be reduced by a vacuum pumping manner.
Further preferably, the vacuumizing time is more than or equal to 1h.
Preferably, in the step S2, the water bath heating time is 6 to 96 hours.
Further preferably, in the step S2, the time for heating in the water bath is 12 to 96 hours.
Specifically, the preparation method of the delignified wood comprises the following steps: soaking wood in a bleaching solution, removing lignin and hemicellulose, cleaning, and freeze-drying to obtain the delignified wood.
Preferably, the bleaching solution is a sodium hypochlorite solution with the mass concentration of 4-10%.
Preferably, the soaking time is 5-10 h.
Preferably, the cleaning is a rinsing with ultra-pure water to change the solution conductivity by less than 4 μ s/cm. The cleaning is to remove unreacted sodium hypochlorite, and the sodium hypochlorite adsorbed on the wood surface is dissociated into water after rinsing, so that the solution has certain conductivity, and the conductivity of the solution is lower than the range, which indicates that the removal of the sodium hypochlorite on the wood surface is basically finished.
Furthermore, the application of the sewage treatment material with the photo-thermal evaporation and the photocatalysis cooperated in photocatalytic degradation and/or photo-thermal water evaporation also should be within the protection scope of the invention.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, a double-layer photothermal-photocatalytic coupling sewage treatment device is constructed, the photothermal layer and the photocatalytic layer have excellent synergistic effect, and the photothermal water evaporation efficiency and the photocatalytic degradation efficiency are greatly improved. The double-layer structure provided by the invention has Janus characteristics of hydrophobic upper layer and hydrophilic lower layer, and the lower hydrophilic wood pore channel can be continuously transported to an evaporation interface in the process of interface solar water evaporation, so that the efficiency of photo-thermal water evaporation is improved. The existence of the upper photo-thermal layer can increase the local temperature, further improve the photo-catalytic activity and accelerate the reaction rate; in addition, as the solution is driven to flow upwards in the evaporation process, pollutants are enriched at the bottom of the device, and the catalytic efficiency is further increased.
(2) According to the invention, the process steps and conditions of carbonization treatment, hydrolysis reaction and the like of the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis are optimized, so that the water evaporation rate of the prepared sewage treatment wood with the cooperation of photothermal evaporation and photocatalysis is more than 1.7 kg/(m & lt/m & gt) 2 H), the photodegradation efficiency of the lower photocatalytic layer is higher than 98%. The degradation rate of 50mL of dye solutions with the concentration of 50mg/L, such as methyl blue, methylene blue, methyl orange, sudan red B and the like, reaches 95-100% within 30 min.
(3) The wastewater treated by the method can be divided into two parts, wherein one part is pure distilled water obtained by utilizing sunlight to carry out interface evaporation and collection, the other part is dischargeable wastewater for removing organic pollutants, and the discharge amount of the wastewater is greatly reduced compared with that of the traditional method.
Drawings
FIG. 1 is a schematic diagram of the structure and application of a sewage treatment material combining photothermal evaporation and photocatalysis.
FIG. 2 is an XRD pattern of a photocatalytic layer in the sewage treatment material cooperating with photothermal evaporation and photocatalysis.
FIG. 3 is a scanning electron microscope image of a photocatalytic layer in the sewage treatment material cooperating with photothermal evaporation and photocatalysis.
FIG. 4 is a graph showing the dynamic contact angles of a carbonization layer and a photocatalytic layer in a sewage treatment material in cooperation with photothermal evaporation and photocatalysis.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way. The reagents, methods and apparatus employed in the present invention are conventional in the art, except as otherwise indicated.
Example 1
A preparation method of a sewage treatment material with photo-thermal evaporation and photocatalysis synergistic comprises the following steps:
(1) The method comprises the steps of immersing Barsha wood chips with the specification of 30mm multiplied by 5mm into a sodium hypochlorite solution with the mass concentration of 4-10%, reacting for 5 hours at room temperature, then washing with ultrapure water until the conductivity change of the solution is lower than 4 mu s/cm, and freeze-drying to obtain the delignified wood.
(2) And (2) horizontally placing the delignified wood in the step (1) on a hot table at 550 ℃, and carbonizing the surface of the wood for about 15 seconds to form a carbonized layer with the thickness of about 1mm on the surface of the wood.
(3) Preparing 0.05mol/L ferric chloride solution, naturally floating the carbonized wood in the step (2) on the surface of the ferric chloride solution with the carbonized layer facing upwards, vacuumizing for 1h to enable the ferric chloride solution to quickly enter pores of the lower-layer wood, adding 0.01mol/L hydrochloric acid solution into the solution, and placing the solution in a water bath at 60 ℃ for hydrolysis for 24h to enable the beta-FeOOH nano particles generated by hydrolysis to be loaded in the pores of the lower-layer non-carbonized wood, wherein the loading amount of the FeOOH nano particles is 10.27wt%. And cleaning and drying to obtain the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis of an upper photothermal layer (a carbonization layer) and a lower photocatalytic layer (loaded with FeOOH nano particles).
Example 2
This example differs from example 1 in that: in the step (2), the carbonization time is 30s, and a carbonized layer with the thickness of about 2mm is formed on the surface of the wood.
Example 3
This example differs from example 1 in that: in the step (2), the carbonization time is 45s, and a carbonized layer with the thickness of about 2.5mm is formed on the surface of the wood.
Example 4
This example differs from example 1 in that: in the step (3), the hydrolysis time was 6h, and the amount of FeOOH nanoparticles supported was 3.99wt%.
Example 5
The present example differs from example 1 in that: in the step (3), the hydrolysis time is 12h, and the loading amount of FeOOH nanoparticles is 8.52wt%.
Example 6
This example differs from example 1 in that: in the step (3), the hydrolysis time was 48h, and the supported amount of FeOOH nanoparticles was 11.94wt%.
Example 7
This example differs from example 1 in that: in the step (3), the hydrolysis time is 72h, and the loading of FeOOH nanoparticles is 12.94wt%.
Example 8
The present example differs from example 1 in that: in the step (2), the carbonization time is about 8s, and a carbonized layer with the thickness of about 0.5mm is formed on the surface of the wood; in the step (3), the mixture is placed in a water bath at 90 ℃ for hydrolysis.
Example 9
This example differs from example 1 in that: in the step (3), the mixture is placed in a water bath at 40 ℃ for hydrolysis for 96h, and the loading of FeOOH nanoparticles is 13.5wt%.
Comparative example 1
Comparative example 1 differs from example 1 in that: only step (1) is carried out, and step (2) and step (3) are not carried out, so that the delignified wood is obtained.
Comparative example 2
Comparative example 2 differs from example 1 in that: only the step (1) and the step (2) are carried out, and the step (3) is not carried out, and carbonized wood is obtained.
Comparative example 3
Comparative example 3 differs from example 1 in that: the treatment of step (1) was not performed, but the Barsha wood chips were directly subjected to the treatment of step (2), and the amount of FeOOH nanoparticles was 3.24wt%.
Comparative example 4
Comparative example 4 differs from example 1 in that: the delignified wood obtained in the step (1) was directly subjected to the step (3) without the step (2) treatment, and the supported amount of FeOOH nanoparticles was 12.83wt%.
In the above examples and comparative examples, the method for testing the amount of FeOOH supported in the photocatalytic layer was: performing thermogravimetric test on the wood loaded with FeOOH nano particles, thermally cracking hemicellulose and cellulose in the wood at high temperature, and obtaining the residual Fe which is the product after FeOOH oxidation 2 O 3 Thus, the amount of FeOOH supported was deduced.
Test example 1
The photocatalytic layer of the sewage treatment material combining photothermal evaporation and photocatalysis prepared in example 1 was subjected to XRD detection and scanning electron microscope detection.
Fig. 1 is a schematic diagram of the structure and application of the material, fig. 2 is a diagram of XRD detection results, and fig. 3 is a sectional scanning electron microscope diagram of the photocatalytic layer, which can show that after lignin is removed from the wood, a large amount of cellulose is exposed on the surface and can be chelated with iron ions, so that β -FeOOH nanocrystals produced by hydrolysis are successfully loaded in the pores of the wood in the non-carbonized layer.
Meanwhile, as a porous material, the method comprises the following specific operations by comparing the dynamic contact angles of the photo-thermal layer and the surface of the photocatalytic layer of the double-layer device: the hydrophilicity and hydrophobicity of the upper layer and the lower layer of the wood are observed by selecting an OCA 15EC contact angle measuring instrument of the company Dataphysics, 3 mu L of water drop is dropped each time, the initial contact angle and the dynamic contact angle (the contact angle at different time after the water drop contacts the surface) are measured, and the time for immersing the water drop into the wood is compared.
As a result, as shown in fig. 4, when the time from the contact of the liquid drop with the surface of the material to the complete immersion of the liquid drop into the pore channel is observed to compare the difference of hydrophilicity and hydrophobicity between the materials, the water drop penetrates from the surface of the carbonized photothermal layer to the other surface for a long time, spreads and disappears on the surface of the photocatalytic layer in a very short time, and the photothermal layer has the hydrophobic property, while the photocatalytic layer has the hydrophilic property, and the whole device has the Janus structure.
Test example 2
The photothermal evaporation and photocatalytic degradation tests were performed on the photothermal evaporation and photocatalytic synergistic sewage treatment materials prepared in the above examples and comparative examples. Photo-thermal water evaporation test is carried out at 1kW/m 2 The method is carried out under a xenon lamp, dye wastewater in a photocatalytic degradation test is a methylene blue solution, 50mL of 20mg/L methylene blue solution is prepared, the pH is adjusted to 3, 20 mu L of hydrogen peroxide is added to serve as a raw material solution, and the concentration is 1kW/m 2 The reaction is carried out for 30min under a xenon lamp, the ultraviolet-visible light absorbance change before and after the reaction is tested, and the dye concentration after the reaction is compared. The photothermal evaporation and photocatalysis synergistic sewage treatment material prepared in each example and comparative example has the photothermal water evaporation rate and photocatalytic degradation efficiency data shown in table 1 below.
TABLE 1
From the above examples 1 to 3, it is understood that the thickness of the carbonized layer of the wood increases with the increase of the carbonization time, but the photo-thermal water evaporation rate of the material does not change much, but the photodegradation efficiency slightly decreases due to the corresponding decrease of the thickness of the photocatalytic layer.
From the above example 1 and examples 4 to 7, it can be seen that as the hydrolysis time of the ferric chloride solution increases, the supported amount of FeOOH nanoparticles in the photocatalytic layer of the material increases, the evaporation performance of the photothermal water is not affected basically, and the photodegradation performance is stable after the hydrolysis time exceeds 12 hours. The photothermal water evaporation rate and photothermal degradation efficiency of the sewage treatment materials prepared in examples 8 and 9 were comparable to those of example 1.
As can be seen from comparative example 1 and example 1, the wood of comparative example 1, which was not carbonized and not loaded with FeOOH nanoparticles, had a photothermal water evaporation rate of 0.67 kg/(m) 2 H) the photodegradation efficiency was 23.6%, all much lower than in example 1. The wood not loaded with FeOOH nano particles in the comparative example 1 has a certain degradation efficiency, because the photodegradation efficiency is obtained by calculating the solution concentration before and after the reaction, and because the wood has a certain adsorption effect, the solution concentration after the treatment is reduced; the hydrophilic nature of wood promotes interfacial water transport and therefore has a certain rate of water evaporation.
As can be seen from comparative example 2 and example 1, in example 1, compared to comparative example 2, the lower photocatalytic layer loaded with FeOOH nanoparticles is formed, the photocatalytic degradation efficiency of the material in example 1 is greatly improved, and the photo-thermal water evaporation rate of the upper carbonized layer is also improved to some extent, which indicates that there is a synergistic effect between the lower photocatalytic layer and the upper carbonized layer.
It can be seen from comparative example 3 and example 1 that, in example 1, compared with comparative example 3, the delignification treatment is performed on the wood, and it is obvious that in example 1 in which the delignification treatment is performed, the loading amount of the material loaded with FeOOH nanoparticles is greatly improved, and further the photodegradation efficiency of the material is improved. The method shows that after the wood is delignified, a large amount of cellulose is exposed on the surface and can be chelated with iron ions, so that FeOOH nanoparticles generated by hydrolysis are successfully loaded in the pore channels of the wood in the non-carbonized layer. In addition, the removal of lignin is also beneficial to the improvement of the photo-thermal water evaporation efficiency. Compared with the embodiment 4, the carbonization layer has the same thickness, the FeOOH nano-particle loading is similar, but the photothermal water evaporation rate and the photodegradation efficiency of the embodiment 4 are far better than those of the embodiment 3, because the hydrophilicity of the wood is greatly improved after the lignin is removed, a water transmission path is provided, and the water at the bottom of the wood is more favorably supplemented to an evaporation interface in time, so that the photothermal water evaporation effect is greatly improved; in a similar way, the water evaporation process also drives the contaminated substrate in the solution to be transmitted upwards, so that dye molecules are in more complete contact with FeOOH nanoparticles, and the degradation efficiency is improved. This further embodies the synergy of the present invention. As can be seen from comparative example 4 and example 1, in example 1, compared with comparative example 4, the water evaporation rate of the material is greatly improved when the wood is carbonized; in addition, the carbonization treatment also influences the photocatalytic degradation efficiency of the material to a certain degree.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is conceivable, and the examples presented herein demonstrate the results of applicants' actual experiments. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The utility model provides a sewage treatment material that light and heat evaporation and photocatalysis are collaborative, its characterized in that, sewage treatment material is for taking off lignin timber, including upper photothermal layer and lower floor's photocatalysis layer, upper photothermal layer is the carbonization layer through surface carbonization treatment, lower floor's photocatalysis layer load has the photocatalysis material that degrades.
2. The sewage treatment material according to claim 1, wherein the carbonized layer has a thickness of 10 to 50%.
3. The sewage treatment material according to claim 1 or 2, wherein the loading amount of the photocatalytic degradation material is 5 to 13.5wt%.
4. The sewage treatment material according to claim 1, wherein the carbonized layer has a thickness ratio of 10-40%; the load capacity of the photocatalytic degradation material is 10-13.5 wt%.
5. The wastewater treatment material of claim 1, wherein the photocatalytic degradation material is FeOOH nanoparticles.
6. A preparation method of a sewage treatment material with photo-thermal evaporation and photocatalysis cooperated is characterized by comprising the following steps:
s1, carbonizing delignified wood to form delignified wood with a carbonized layer as an upper layer;
s2, placing the delignified wood with the upper layer being a carbonized layer in an iron salt solution to enable the carbonized layer to face upwards, adjusting the pH value of the iron salt solution to be acidic, heating the delignified wood with water in a water bath at the temperature of 40-90 ℃ to load FeOOH nano-particles generated by hydrolysis in a pore canal of the lower layer wood which is not carbonized, cleaning and drying to obtain the sewage treatment material with the cooperation of photothermal evaporation and photocatalysis.
7. The production method according to claim 6, wherein in the step S1, the carbonization treatment is: heating the delignified wood for 8-45 s at 250-550 ℃; preferably, the delignified wood is heated at 250 to 550 ℃ for 15 to 30s.
8. The method according to claim 6 or 7, wherein in the step S2, the water bath heating time is 6-96 h; preferably, the time for heating in the water bath is 12-96 h.
9. The method according to claim 6, wherein in step S2, the ferric salt solution is ferric chloride solution.
10. Use of the wastewater treatment material with the cooperation of photothermal evaporation and photocatalysis as defined in any one of claims 1 to 5 or the wastewater treatment material with the cooperation of photothermal evaporation and photocatalysis as obtained by the preparation method as defined in any one of claims 6 to 9 in photocatalytic degradation and/or photothermal water evaporation.
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| CN116585909A (en) * | 2023-07-14 | 2023-08-15 | 中南大学 | Iron-based photo-thermal conversion film and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116585909A (en) * | 2023-07-14 | 2023-08-15 | 中南大学 | Iron-based photo-thermal conversion film and preparation method and application thereof |
| CN116585909B (en) * | 2023-07-14 | 2023-09-29 | 中南大学 | Iron-based photo-thermal conversion film and preparation method and application thereof |
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