Preparation method and application of degradable bio-based fiber composite foam

Abstract

The invention discloses a preparation method and application of degradable bio-based fiber composite foams, ferric trichloride hexahydrate and terephthalic acid are stirred and dispersed in an N, N-dimethylformamide solution, then the solution is placed in high-temperature water, and a hydrothermal reaction is performed until the mixture is fully mixed; the octahedral metal organic framework material is obtained; weighing polyvinyl alcohol, adding water for dissolving, then putting into high-temperature water, and stirring in a water bath until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution; adding absolutely dry bleached softwood pulp into a polyvinyl alcohol solution, then adding the obtained octahedral metal organic framework material, continuously stirring and mixing, finally adding sodium dodecyl benzene sulfonate into the mixed solution, and continuously stirring to obtain a fiber composite foam material; and putting the obtained fiber composite foam into a drying oven for constant-temperature treatment. The invention provides a novel, effective and environment-friendly water treatment photocatalyst, a potential new method is provided for continuous purification of water pollutants, and a direction is pointed out for development of green water treatment materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional preparation of biomass materials, and specifically relates to a preparation method and application of a degradable bio-based fiber composite foam with photocatalytic activity. Background Art

[0002] With the development of the leather-making, textile industries and the pharmaceutical industry, a large amount of industrial dye and antibiotic wastewater enters the environment, posing a major threat to human health. Traditional pollution removal methods, including adsorption, flocculation, filtration, and biological treatment, all have the disadvantages of incomplete pollutant removal and high material consumption. Therefore, developing efficient and environmentally friendly dye wastewater treatment technologies has become an important research direction in the current field of environmental science. As an efficient advanced oxidation process, photocatalytic technology shows great potential in degrading organic pollutants. However, it still faces the test of carrier materials and catalyst stability in large-scale application of catalysts.

[0003] Currently, photocatalysts still face some challenges in practical applications, such as low reaction efficiency, narrow light absorption range, and poor reusability. Therefore, how to optimize the design and preparation process of photocatalysts and improve their performance is one of the current research hotspots.

[0004] Although a variety of composite materials have been developed, most of them still have problems such as insufficient mechanical properties, poor heat resistance, and poor environmental friendliness. In addition, the understanding of the interaction mechanism between different components in the existing technology is not deep enough, which leads to unstable performance of composite materials. Therefore, reasonable design of the composite system, optimization of the composition ratio, and adoption of advanced preparation processes will be important ways to improve the overall performance of composite materials. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a preparation method and application of a degradable bio-based fiber composite foam, which solves the above technical problems existing in the existing technology.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A preparation method of a degradable bio-based fiber foam with photocatalytic activity, comprising the following steps: S1. Stir and disperse ferric chloride hexahydrate and terephthalic acid in an N,N-dimethylformamide solution, and then place it in hot water at 100 - 110°C for hydrothermal reaction for more than 20 h until the mixture is fully mixed; After the reaction is completed, cool naturally, centrifuge, wash, and dry to obtain MIL-101(Fe) octahedral metal-organic framework material; S2. Weigh polyvinyl alcohol, add water to dissolve it, then place it in hot water at 90 - 95 °C, and stir it in a water bath for 1.5 h until it is completely dissolved to obtain a polyvinyl alcohol solution; S3. Add absolutely dry bleached softwood pulp with a concentration of 40.0 g / L to the polyvinyl alcohol solution, mix again, then add the MIL-101(Fe) octahedral metal-organic framework material obtained in S1 and continue to stir and mix. Finally, add sodium dodecylbenzenesulfonate with a concentration of 0.8 g / L to the mixed solution, continue to stir and mix to obtain a fiber composite foam material; S4. Place the obtained fiber composite foam in an oven at 60 - 80 °C and keep it at a constant temperature for 48 h; For the obtained fiber composite foam, the removal rates of tetracycline hydrochloride and rhodamine B reach more than 85% within 180 min, and the removal efficiency remains above 70% after continuously treating 20 mg / L of tetracycline hydrochloride in 4 cycles of 12 h each.

[0007] Further, in S1, the mass concentration of ferric chloride hexahydrate is 75 mg / mL, and the mass concentration of terephthalic acid is 13.7 mg / mL.

[0008] Further, in S1, ferric chloride hexahydrate and terephthalic acid are stirred and dispersed in N,N-dimethylformamide solution and first magnetically stirred and mixed for more than 1 h.

[0009] Further, in S1, the centrifugation rate is 9000 r / min, and the drying temperature is 60 - 80 °C.

[0010] Further, in S2, the mass concentration of polyvinyl alcohol is 2.0 wt%.

[0011] Further, in S3, the mixing and stirring rate is 3000 r / min, and the stirring time is 10 min.

[0012] Further, in S3, the mass ratio of the dosage of polyvinyl alcohol to absolutely dry bleached softwood pulp is 1:1.

[0013] Further, in S3, the mass addition concentration of the MIL-101(Fe) octahedral metal-organic framework material is 0.25 - 0.50 g / g.

[0014] Further, in S4, the temperature of the drying oven is 60 °C.

[0015] Further, for the application of the degradable bio-based fiber composite foam, the application of the cellulose composite foam in the photocatalytic degradation of organic dyes.

[0016] Advantages of the present invention: 1. The present invention utilizes the synergistic effect of photocatalysis and adsorption. The porous structure of the cellulose foam can adsorb organic dyes in water, enriching them on the surface of the catalyst, thereby increasing the local concentration and efficiency of the photocatalytic reaction.

[0017] 2. In the examples of the present invention, the degradation rates of Rhodamine B and Tetracycline Hydrochloride by the MIL-101(Fe) / cellulose foam material under light are significantly higher than those of the comparative materials. Specifically, MIL-101(Fe) / cellulose foam-1 and foam-2 achieved degradation rates of 97.9% and 96.9% of 20 mg / L Rhodamine B within 180 minutes, respectively, while the degradation rate of the comparative material was only 53.9%. A similar trend was also shown for the degradation rate of Tetracycline Hydrochloride, which were 85.9% and 84.8% respectively, while the degradation rate of the comparative material was only 45.0%.

[0018] 3. The present invention uses the MIL-101(Fe) / cellulose foam material to still maintain a pollutant removal efficiency of over 70% after continuous light irradiation for 12 hours, showing excellent mechanical stability and persistent photocatalytic activity, and having the characteristics of high mechanical properties, low cost, and easy recovery. The material undergoes self-degradation of over 80% after 36 days in the natural environment, indicating its good environmental friendliness.

[0019] 4. The present invention provides a new, effective and environmentally friendly photocatalyst for water treatment, providing a potential new method for the continuous purification of water pollutants and indicating a direction for the development of green water treatment materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is the synthetic route diagram of the preparation method of the present invention.

[0022] Figure 2 It is the XRD diffraction pattern of the materials prepared in Example 1, Example 3 and Comparative Example 1.

[0023] Figure 3 Scanning electron micrographs of the octahedra of MIL-101(Fe), bleached softwood fibers and MIL-101(Fe) / cellulose foam materials prepared in Example 1, Example 3 and Comparative Example 1.

[0024] Figure 4It is a line graph of the photocatalytic degradation performance of Rhodamine B and a liquid UV spectrum changing with time for MIL-101(Fe) / cellulose foam-1, MIL-101(Fe) / cellulose foam-2, and pure cellulose foam prepared in Example 4 and Comparative Example 2.

[0025] Figure 5 It is a line graph of the photocatalytic degradation performance of tetracycline and a liquid UV spectrum changing with time for MIL-101(Fe) / cellulose foam-1, MIL-101(Fe) / cellulose foam-2, and pure cellulose foam prepared in Example 4 and Comparative Example 3.

[0026] Figure 6 It is a line graph of the photocatalytic degradation performance of tetracycline hydrochloride for 12 consecutive hours in Example 6.

[0027] Figure 7 It is a self-degradation change graph of the prepared cellulose foam in the natural environment (from March 10, 2025 to April 14, 2025, a total of 36 days) Detailed implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] Figure 1 It is a synthesis route diagram of the preparation method of the present invention. Weigh a certain amount of ferric chloride hexahydrate and terephthalic acid, disperse them in an N,N-dimethylformamide solution and stir to mix, transfer to a polytetrafluoroethylene reaction kettle, carry out a solvothermal reaction, and obtain the MIL-101(Fe) metal-organic framework material by centrifugation, washing, and drying. Subsequently, disperse MIL-101(Fe) in the PVA solution of bleached softwood pulp mixed oil, mechanically stir at room temperature, pour into a mold and dry to obtain the MIL-101(Fe) / cellulose foam material.

[0030] Using the porous material cellulose foam as a carrier, by in-situ loading the MIL-101(Fe) photocatalytic material, it solves the technical problems of easy loss of the catalyst and unstable activity in the traditional photocatalytic system. Innovatively, a fiber foam material is prepared by crosslinking biodegradable polyvinyl alcohol with plant fibers and the MIL-101(Fe) material. And it has been applied in the large-scale treatment of water-soluble organic dye pollution and antibiotic pollution by photocatalytic technology.

[0031] Example 1 First step: Put 4.5 g of FeCl3·6H2O and 0.824 g of terephthalic acid into 60 mL of N, N-dimethylformamide solution (the mass concentration of ferric chloride hexahydrate is 75 mg / mL, and the mass concentration of terephthalic acid is 13.7 mg / mL, both relative to the N, N-dimethylformamide solution), and stir on a magnetic stirrer for 30 minutes; Second step: Transfer the solution obtained in the first step to a 100 mL polytetrafluoroethylene reaction kettle, take it out and cool naturally after hydrothermal treatment at 110 °C for 20 h; Third step: Centrifuge and wash the sample obtained in the second step, and dry it at 60 °C to obtain the MIL-101(Fe) metal-organic framework material.

[0032] Example 2 First step: Put 15.0 g of PVA-2499 (polyvinyl alcohol) into 500 mL of water, and stir in a water bath at 90 °C for 1.5 h until it is completely dissolved; Second step: Add 20.0 g of absolutely dry bleached softwood (to obtain a concentration of 40.0 g / L) to the solution obtained in the first step, and stir at 3000 rpm for 10 minutes; Third step: Add 5 g of MIL-101(Fe) to the suspension obtained in the second step, and continue to stir at 3000 rpm for 10 minutes; Fourth step: Continue to add 0.6 g of sodium dodecylbenzenesulfonate and 250 mL of water (to obtain a concentration of 0.8 g / L) to the mixed suspension obtained in the third step, and stir at 3000 rpm for 10 minutes; Fifth step: Pour the mixed suspension obtained in the fourth step into a mold, and place it in an oven at 60 °C for 48 h to obtain the MIL-101(Fe) / cellulose foam-1 material.

[0033] Example 3 First step: Put 15.0 g of PVA-2499 into 500 mL of water, and stir in a water bath at 90 °C for 1.5 h until it is completely dissolved; Second step: Add 20.0 g of absolutely dry bleached softwood (to obtain a concentration of 40.0 g / L) to the solution obtained in the first step, and stir at 3000 rpm for 10 minutes; Third step: Add 10 g of MIL-101(Fe) to the suspension obtained in the second step, and continue to stir at 3000 rpm for 10 minutes; Fourth step: Continue to add 0.6 g of sodium dodecylbenzenesulfonate and 250 mL of water (to obtain a concentration of 0.8 g / L) to the mixed suspension obtained in the third step, and stir at 3000 rpm for 10 minutes; Step 5: Pour the mixed suspension obtained in Step 4 into a mold and place it in an oven at 60 °C for 48 h to obtain the MIL-101(Fe) / cellulose foam-2 material.

[0034] Example 4 Step 1: Disperse the 5×5 cm 2 MIL-101(Fe) / cellulose foam material in 500 mL of 20 mg / L rhodamine B solution and stir magnetically. Step 2: Irradiate the suspension obtained in Step 1 under a 300 W xenon lamp (λ > 420 nm), and take 3 mL of the liquid every 30 minutes. Step 3: Centrifuge the liquid sample obtained in Step 2 at 9000 r / min for 1 min to remove the detached foam debris material. Step 4: Detect the centrifuged liquid obtained in Step 3 with a UV-visible spectrophotometer to evaluate the photocatalytic performance.

[0035] Example 5 Step 1: Disperse the 5×5 cm 2 MIL-101(Fe) / cellulose foam material in 500 mL of 20 mg / L tetracycline hydrochloride solution and stir magnetically. Step 2: Irradiate the suspension obtained in Step 1 under a 300 W xenon lamp (λ > 420 nm), and take 3 mL of the liquid every 30 minutes. Step 3: Centrifuge the liquid sample obtained in Step 2 at 9000 r / min for 1 min to remove the detached foam debris material. Step 4: Detect the centrifuged liquid obtained in Step 3 with a UV-visible spectrophotometer to evaluate the photocatalytic performance.

[0036] Example 6 Step 1: Disperse the 5×5 cm 2 MIL-101(Fe) / cellulose foam material in 500 mL of 20 mg / L tetracycline hydrochloride solution and stir magnetically. Step 2: Irradiate the suspension obtained in Step 1 under a 300 W xenon lamp (λ > 420 nm), and take 3 mL of the liquid every 60 minutes. Step 3: Centrifuge the liquid sample obtained in Step 2 at 9000 r / min for 1 min to remove the detached foam debris material. Step 4: Detect the centrifuged liquid obtained in Step 3 with a UV-visible spectrophotometer to evaluate the photocatalytic performance.

[0037] Step 5: Add 9 mL of deionized water and 10 mg of tetracycline hydrochloride powder every 3 h to ensure a concentration of 20 mg / L of tetracycline hydrochloride solution, and continuously perform the light irradiation test for 12 h.

[0038] Comparative Example 1 Step 1: Place 15.0 g of PVA-2499 in 500 mL of water, and stir in a water bath at a high temperature of 90 °C for 1.5 h until it is completely dissolved; Step 2: Add 20.0 g of absolutely dry bleached softwood (to obtain a concentration of 40.0 g / L) to the solution obtained in Step 1, and stir at 3000 rpm for 10 minutes; Step 3: Continuously add 0.6 g of sodium dodecylbenzenesulfonate and 250 mL of water (to obtain a concentration of 0.8 g / L) to the mixed suspension obtained in Step 2, and stir at 3000 rpm for 10 minutes; Step 4: Pour the mixed suspension obtained in Step 3 into a mold, and place it in an oven at 60 °C for 48 h to obtain the cellulose foam material.

[0039] Comparative Example 2 Step 1: Disperse the 5×5 cm 2 cellulose foam material in 500 mL of 10 mg / L rhodamine B solution, and stir magnetically; Step 2: Place the suspension obtained in Step 1 under irradiation of a 300 W xenon lamp (λ > 420 nm), and take 3 mL of the liquid every 30 minutes; Step 3: Centrifuge the liquid sample obtained in Step 2 at 9000 r / min for 1 min to remove the exfoliated foam debris material; Step 4: Detect the centrifuged liquid obtained in Step 3 with a UV-visible spectrophotometer to evaluate the photocatalytic performance.

[0040] Comparative Example 3 Step 1: Disperse the 5×5 cm 2 cellulose foam material in 500 mL of 20 mg / L tetracycline hydrochloride solution, and stir magnetically; Step 2: Place the suspension obtained in Step 1 under irradiation of a 300 W xenon lamp (λ > 420 nm), and take 3 mL of the liquid every 30 minutes; Step 3: Centrifuge the liquid sample obtained in Step 2 at 9000 r / min for 1 min to remove the exfoliated foam debris material; Step 4: Detect the centrifuged liquid obtained in Step 3 with a UV-visible spectrophotometer to evaluate the photocatalytic performance.

[0041] Figure 2XRD diffraction patterns of the materials prepared in Example 1, Example 3, and Comparative Example 1. In the figure, the characteristic diffraction peaks of MIL-101(Fe) and cellulose I correspond to Example 1 and Comparative Example 1, respectively. The XRD pattern of Example 1 has characteristic peaks of MIL-101(Fe) at 5.2°, 5.8°, 9.0°, and 16.4°; the diffraction peaks observed in the XRD pattern of Comparative Example 1 at 15.6° and 22.5° are typical characteristic peaks of cellulose I. Further, analyzing the XRD pattern of Example 3, characteristic diffraction peaks of both MIL-101(Fe) and cellulose appear, indicating the successful synthesis of the composite material.

[0042] Figure 3 Scanning electron micrographs of MIL-101(Fe), bleached softwood fibers, and MIL-101(Fe) / cellulose foam materials prepared in Example 1, Example 3, and Comparative Example 1. (a) shows the prepared MIL-101(Fe) metal-organic framework material with an octahedral morphology; (b) shows the prepared bleached softwood fibers, and (c), (d) show the MIL-101(Fe) / cellulose foam materials. Comparing Figure (a) and Figure (b), it can be found that the MIL-101(Fe) material can be effectively connected to the fiber surface through the cross-linking effect of polyvinyl alcohol.

[0043] Figure 4 Line graphs of the photocatalytic degradation performance of MIL-101(Fe) / cellulose foam-1, MIL-101(Fe) / cellulose foam-2, and pure cellulose foam prepared in Example 4 and Comparative Example 2, and liquid UV spectra changing with time. As can be seen from Figure (a), the MIL-101(Fe) / cellulose foam-1 material prepared in Example 2 2 The degradation rate of 500 mL of 20 mg / L rhodamine B by the catalyst reached over 97.9% within 180 min; The MIL-101(Fe) / cellulose foam-2 material prepared in Example 3 2 The degradation rate of 500 mL of 20 mg / L rhodamine B by the catalyst reached over 96.9% within 180 min; both have higher photocatalytic activity than the material prepared in Comparative Example 1. Comparative Example 1 achieved an adsorption rate of 53.9% for 500 mL of 20 mg / L rhodamine B within 180 min. Figure 4 (b), (c), and (d) are the liquid UV spectra of photocatalytic degradation corresponding to the three materials. As can be seen from the figure, as the illumination time increases, the substances in the solution are gradually mineralized and decomposed, and the intensity of the UV spectral characteristic peaks between 500 and 600 nm gradually decreases.

[0044] Figure 5It is a line graph of the photocatalytic degradation performance of MIL-101(Fe) / cellulose foam-1, MIL-101(Fe) / cellulose foam-2, and pure cellulose foam prepared in Example 4 and Comparative Example 3, as well as a liquid UV spectrum diagram showing the change over time. As can be seen from Figure (a), the MIL-101(Fe) / cellulose foam-1 material prepared in Example 2 achieved a degradation rate of more than 85.9% for 500 mL of 20 mg / L tetracycline hydrochloride degraded by the catalyst within 180 min; the MIL-101(Fe) / cellulose foam-2 material prepared in Example 3 achieved a degradation rate of more than 84.8% for 500 mL of 20 mg / L tetracycline hydrochloride degraded by the catalyst within 180 min; both showed higher photocatalytic activity than the material prepared in Comparative Example 1. Comparative Example 1 achieved an adsorption rate of 45.0% for 500 mL of 20 mg / L tetracycline hydrochloride within 180 min. 2 The degradation rate of 500 mL of 20 mg / L tetracycline hydrochloride degraded by the catalyst reached more than 85.9% within 180 min; for the MIL-101(Fe) / cellulose foam-2 material prepared in Example 3, within 180 min, 2 the degradation rate of 500 mL of 20 mg / L tetracycline hydrochloride degraded by the catalyst reached more than 84.8%; both had higher photocatalytic activity than the material prepared in Comparative Example 1. Comparative Example 1 achieved an adsorption rate of 45.0% for 500 mL of 20 mg / L tetracycline hydrochloride within 180 min. Figure 5 (b), (c), and (d) are the liquid UV spectrum diagrams corresponding to the photocatalytic degradation of the three materials. As can be seen from the figure, as the illumination time increased, the substances in the solution were gradually mineralized and decomposed, and the intensity of the UV spectral characteristic peaks between 350 and 400 nm gradually decreased.

[0045] Figure 6 It is a line graph of the photocatalytic degradation performance of tetracycline hydrochloride for 12 consecutive hours in Example 6. After continuous illumination treatment of water with MIL-101(Fe) / cellulose foam-2 for 12 h, it could still maintain a removal efficiency of more than 70% of pollutants, demonstrating its excellent mechanical stability and photocatalytic activity.

[0046] Figure 7 It is a graph showing the self-degradation change of the prepared cellulose foam in the natural environment (from March 10, 2025 to April 14, 2025, a total of 36 days). The material self-degraded by more than 80% within 36 days, indicating its sufficient environmental friendliness.

[0047] In summary, a self-degrading bio-based foam material with photocatalytic activity can be prepared through a simple mechanical mixing and drying forming process, which will provide a potential new method for the preparation of a novel photocatalyst for the continuous purification of water pollutants and point the way for the preparation and application of green water treatment materials.

[0048] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A preparation method of a degradable bio-based fiber composite foam with photocatalytic activity, characterized in that, It includes the following steps: S1. Stir and disperse ferric chloride hexahydrate and terephthalic acid in N,N-dimethylformamide solution, and then place it in hot water at 100 - 110 °C for hydrothermal reaction for more than 20 h until they are fully mixed; After the reaction ends, cool it naturally, centrifuge, wash, and dry to obtain MIL-101(Fe) octahedral metal-organic framework material; S2. Weigh polyvinyl alcohol, dissolve it in water, and then place it in hot water at 90 - 95 °C and stir it in a water bath for 1.5 h until it is completely dissolved to obtain polyvinyl alcohol solution; S3. Add absolutely dry bleached softwood pulp with a concentration of 40.0 g / L to the polyvinyl alcohol solution and mix again. Then add the MIL-101(Fe) octahedral metal-organic framework material obtained in S1 and continue to stir and mix. Finally, add sodium dodecylbenzenesulfonate with a concentration of 0.8 g / L to the mixed solution and continue to stir and mix to obtain fiber composite foam material; S4. Place the obtained fiber composite foam in an oven at 60 - 80 °C and keep it at a constant temperature for 48 h; For the obtained fiber composite foam, the removal rates of tetracycline hydrochloride and rhodamine B reach more than 85% within 180 min, and the removal efficiency remains above 70% after continuously treating 20 mg / L tetracycline hydrochloride for 4 cycles for 12 h.

2. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S1, the mass concentration of ferric chloride hexahydrate is 75 mg / mL, and the mass concentration of terephthalic acid is 13.7 mg / mL.

3. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S1, ferric chloride hexahydrate and terephthalic acid are stirred and dispersed in N,N-dimethylformamide solution and mixed by magnetic stirring for 30 - 60 min.

4. The preparation method of the degradable bio-based fiber composite foam according to claim 1, wherein In S1, the centrifugation rate is 9000 r / min, and the drying temperature is 60 - 80 °C.

5. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S2, the mass concentration of polyvinyl alcohol is 2.0 wt%.

6. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S3, the mixing and stirring rate is 3000 r / min, and the stirring time is 10 min.

7. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S3, the mass ratio of polyvinyl alcohol to absolutely dry bleached softwood pulp is 1:

1.

8. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S3, the mass addition concentration of MIL-101(Fe) octahedral metal-organic framework material is 0.25 - 0.50 g / g.

9. The preparation method of the degradable bio-based fiber composite foam according to claim 1, characterized in that, In S4, the temperature of the drying oven is 60 °C.

10. Use of the degradable bio-based fiber composite foam according to any one of claims 1 to 9, characterized in that The application of the cellulose composite foam in photocatalytic degradation of organic dyes.

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