CN111203159A - Preparation method and application of curcumin-titanium dioxide-three-dimensional graphene composite aerogel - Google Patents
Preparation method and application of curcumin-titanium dioxide-three-dimensional graphene composite aerogel Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 94
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- 239000004964 aerogel Substances 0.000 title claims abstract description 56
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- VFLDPWHFBUODDF-FCXRPNKRSA-N curcumin Chemical compound C1=C(O)C(OC)=CC(\C=C\C(=O)CC(=O)\C=C\C=2C=C(OC)C(O)=CC=2)=C1 VFLDPWHFBUODDF-FCXRPNKRSA-N 0.000 claims abstract description 64
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/0091—Preparation of aerogels, e.g. xerogels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/22—Organic complexes
- B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
- B01J31/2208—Oxygen, e.g. acetylacetonates
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- B01J35/23—
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- B01J35/39—
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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Abstract
The invention discloses a preparation method and application of curcumin-titanium dioxide-three-dimensional graphene composite aerogel, wherein the preparation method of the graphene aerogel comprises the following steps: firstly, ultrasonically dispersing curcumin and graphene oxide uniformly; then ascorbic acid and tetrabutyl titanate are respectively added for uniform ultrasonic dispersion; and preparing the curcumin-titanium dioxide-graphene ternary composite hydrogel by adopting a sol-gel method, and freeze-drying to obtain the aerogel. The beneficial effects of the invention include: the structure of the graphene is not easy to damage in the freeze drying process, functional groups on the structure of the graphene are easy to store, and the freeze-dried graphene is not easy to agglomerate. The aerogel has large porous surface area, good electron transfer capacity and repeated utilization.
Description
Technical Field
The invention belongs to the technical field of functional materials, and particularly relates to a preparation method of curcumin-titanium dioxide-three-dimensional graphene composite aerogel and application of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel in photocatalytic degradation of sulfonamide drugs in water.
Background
With the improvement of environmental analysis technology and the enhancement of environmental awareness of people, trace organic pollutants in the environment attract extensive attention, and particularly, the drugs and personal care products (PPCPs) are emerging pollutants, including human and veterinary pharmaceuticals, diagnostic agents, health care products, musk, cosmetics, light screening agents, disinfectants, preservatives and the like. In recent years, PPCPs with the level of ng/L-mug/L are detected in water, soil, sewage and sludge in different countries and regions, and even reach the level of mg/L in some media. As China has a large population and livestock aquaculture industry is developed, the production and use amount of PPCPs is very large, so that the environmental pollution and ecological toxicity problems of the PPCPs in China become serious.
Sulfonamides (SAs) are typically PPCPs, and have the basic chemical structure sulfanilamide. Residual sulfonamides in the water environment can cause the development of microbial drug resistance, promote the mass propagation of drug-resistant bacteria and seriously destroy the balance and diversity of colonies and communities in the water environment. Meanwhile, the water can enter human and animal bodies again through water circulation, so that the normal immune function and hematopoietic system of human can be damaged, the urinary system, the cranial nerve system, the digestive system and the like of human bodies can be damaged, and the organism of the animals can be seriously damaged and the reproductive capacity of the animals can be influenced. The existing methods for removing SAs comprise a resin adsorption method, a reverse osmosis membrane method, an advanced oxidation method and the like, wherein the resin adsorption method is not suitable for adsorbing trace sulfonamides in a water body due to the characteristics of the resin adsorption method, and the reverse osmosis membrane method adopts the advanced oxidation method for most wastewater treatment due to high energy consumption and high requirements on operating conditions. The photocatalysis advanced oxidation method is a method for generating a hole-electron pair by light excitation, then generating OH free radicals by a chain reaction, and gradually converting organic pollutants in an aqueous solution into micromolecular organic matters until the organic pollutants are completely mineralized.
TiO2The semiconductor material as the photocatalysis has the advantages of stable property, no toxicity, high catalytic activity, no secondary pollution and the like, and particularly realizes the degradation of certain pollutants which are difficult to be biodegraded until mineralization, so that the semiconductor material can be widely applied to the reduction and the decrement of organic pollutants. TiO 22The key to photocatalytic generation of OH is whether holes and electrons generated by photoexcitation can be absorbed by TiO2H adsorbed on the surface2O or OH-and an electron acceptor, if at TiO2Without electron acceptors or H on the surface2O or OH-, the degradation rate of organic pollutants is low. Thus, how to improve the separation of the photoexcited electron-hole pairs is to improve the TiO2The catalytic efficiency is critical.
Curcumin is a compound capable of being stably adsorbed on TiO2A natural dye sensitizer which is surface reproducible. It is a polyphenol substance extracted from Zingiberaceae plant and having multiple uses such as food and medicinal value, its main chain is unsaturated aliphatic and aromatic group, and contains symmetrical bisphenol and diacetone structure, and has wide application in visible light polymerization field, and can be used as photosensitizer of iodonium salt to promote electron transfer. In addition, phenolic hydroxyl on curcumin can also complex TiO2The effect of ensuring curcumin in TiO2Efficient adsorption of the surface.
Single sensitizer TiO2The nano particles have fine strength, are easy to run off along with water during recovery, and have limitation on recycling, so that the TiO content is improved2Another key to catalytic efficiency is TiO2And (4) fixing technology. The carrier can be usually fixed on materials such as polymer resin, natural polymer and the like, and the carrier generally requires the requirements of high specific surface area, large pore diameter, good activity, large solid loading amount, strong impact resistance and the like. Graphene is an excellent carrier, has a high specific surface area and good conductivity, and can effectively improve the catalytic efficiency, so that the graphene is an excellent carrierThe light transmittance of the outer graphene does not influence the absorption of the titanium dioxide to light.
Therefore, the invention selects sulfonamides as target pollutants, and prepares the curcumin-titanium dioxide-three-dimensional graphene composite photocatalytic material by a sol-gel method. According to the invention, curcumin and titanium dioxide are loaded on the three-dimensional graphene aerogel, not only can photoproduction electrons and holes be separated by virtue of the conductivity of graphene, but also organic pollutants are enriched in the catalytic material by the graphene aerogel, and the catalytic efficiency is improved. In addition, the graphene aerogel has hydrophobicity, so that the composite material is also beneficial to separation of the catalyst and a water body.
Disclosure of Invention
The invention aims to provide a preparation method and application of a three-dimensional graphene composite aerogel, and aims to solve the problems that the existing titanium dioxide is poor in catalytic activity and difficult to recover powder materials in the visible light preparation process, so that the preparation method and application of the curcumin-titanium dioxide-three-dimensional graphene aerogel are provided.
The invention relates to a preparation method and application of a curcumin-titanium dioxide-three-dimensional graphene aerogel composite material, which comprises the following steps:
the method comprises the following steps: preparing a graphene oxide solution. Dispersing a certain amount of graphene oxide in deionized water to obtain a brownish yellow suspension, and dispersing under an ultrasonic condition to obtain a stable dispersion liquid.
Step two: preparing curcumin solution. Dissolving curcumin in anhydrous ethanol, and dispersing under ultrasonic condition to obtain stable dispersion.
Step three: tetrabutyl titanate-absolute ethanol solution was prepared. Adding tetrabutyl titanate into absolute ethyl alcohol, and dispersing under an ultrasonic condition to obtain a stable dispersion liquid.
Step four: preparing the curcumin-titanium dioxide-vitamin graphene composite hydrogel. Measuring the graphene oxide solution prepared in the step one and the curcumin solution prepared in the step two, and performing ultrasonic treatment to uniformly disperse the graphene oxide solution and the curcumin solution; adding tetrabutyl titanate-absolute ethyl alcohol solution prepared in the third step, and performing ultrasonic treatment to uniformly disperse the tetrabutyl titanate-absolute ethyl alcohol solution; adding a proper amount of ascorbic acid, and performing ultrasonic treatment to uniformly disperse the solution; and (3) putting the hydrogel into an oil bath for reaction and heating for a period of time, cooling to room temperature, and taking out to obtain the hydrogel.
Step five: preparing the curcumin-titanium dioxide-three-dimensional graphene composite aerogel. And washing the hydrogel prepared in the step four with deionized water for 2-3 times to remove impurities, putting the hydrogel into a freeze-drying machine for freeze drying, and taking out the hydrogel to obtain the curcumin-titanium dioxide-three-dimensional graphene composite aerogel.
The invention also provides an application of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel for degrading sulfonamides in water, a sulfonamide solution with a certain concentration is prepared, the sulfonamides in water are degraded by the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in the fifth step, and meanwhile, an ultraviolet visible light spectrophotometer is used for detecting the characteristic absorption peak intensity of the sulfonamide solution. When the characteristic absorption peak disappears, indicating complete degradation of the sulfonamide in solution, the time taken for degradation is recorded.
Preferably, the concentration of the graphene oxide solution is 1-5 mg/mL.
Preferably, the concentration of the curcumin solution is 0.1-2 mg/mL.
Preferably, the concentration of the tetrabutyl titanate-absolute ethyl alcohol solution is 0.1-1 mg/mL.
Preferably, the volume ratio of the graphene oxide solution to the curcumin solution in the step four is 1:0.5-1:5, the volume ratio of the graphene oxide solution to tetrabutyl titanate-anhydrous ethanol is 1:0.5-1:5, and the mass ratio of the graphene oxide to the ascorbic acid is 1:1-1: 20.
Preferably, the ultrasonic time in the fourth step is 10-40 min.
Preferably, the reaction temperature in the fourth step is 70-100 ℃, and the reaction time is 1-2 h.
Preferably, the temperature of freeze drying in the fifth step is-30 to-50 ℃, vacuum pumping is carried out while freeze drying is carried out, the vacuum degree is 0.1 to 0.15 torr, and the drying time is 24 to 72 hours.
Preferably, the concentration of the sulfonamide in the sixth step is 0.01mol/L-1 mol/L.
Preferably, the dosage of the curcumin-titanium dioxide-three-dimensional graphene composite material in the sixth step is 0.01g/L-1 g/L.
According to the method, the dispersion of the nano-metal titanium dioxide on the graphene matrix material is realized by a sol-gel method, and the regulation and control of the shape and the structure of the titanium dioxide on the surface of the graphene matrix material are realized by controlling the concentration of reactants, the reaction temperature and the reaction time.
Compared with the prior art, the invention has the beneficial effects that:
(1) the preparation method is simple in preparation process, environment-friendly and easy to operate, and is a green chemical preparation method.
(2) The invention has novel design and provides the synergistic effect of curcumin and three-dimensional graphene and TiO2The electron transmission capability of the photocatalyst can inhibit electron-hole recombination and improve the photocatalytic efficiency.
(3) Curcumin used in the invention is used for improving TiO as a sensitizer2Besides the photocatalytic efficiency, the graphene oxide can also be used as an antioxidant to reduce graphene oxide, and phenolic hydroxyl groups are utilized to fix TiO2The synthesis process is simplified, and the repeatability of the catalytic degradation of the composite material is improved.
(4) The curcumin-titanium dioxide-three-dimensional graphene aerogel prepared by the method can degrade sulfonamides under the irradiation of visible light, and has huge application potential in the degradation of organic pollutants in surface water.
Drawings
Fig. 1A and 1B are digital photographs of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in the first example.
Fig. 2 is an SEM image of the composite aerogel prepared in example one, in which the titanium dioxide nanoparticles are uniformly dispersed on the graphene sheet layer.
FIG. 3 is pure TiO2XRD pattern of (a).
Fig. 4 is an XRD pattern of the composite aerogel prepared in example one.
Fig. 5 is a graph of degradation rate of the composite aerogel prepared by the first example of the present invention under ultraviolet light irradiation for degrading sulfonamides at different times.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
Example 1
A curcumin-titanium dioxide-three-dimensional graphene composite aerogel is prepared by loading curcumin and titanium dioxide on a graphene oxide sheet layer by adopting a sol-gel method.
The preparation method of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel in the embodiment comprises the following specific steps:
step 1: preparing a graphene oxide solution. And adding deionized water into the graphite oxide, and performing ultrasonic treatment for 6 hours under the ultrasonic power of 60kHz to obtain a brown uniform graphene oxide solution. Wherein the volume ratio of the mass of the graphite oxide to the deionized water is 0.4g:200 mL.
Step 2: preparing curcumin solution. Adding curcumin into anhydrous ethanol, and performing ultrasonic treatment at ultrasonic power of 30kHz for 15 min. Wherein the volume ratio of the mass of the curcumin to the absolute ethyl alcohol is 6mg:30 mL.
And step 3: tetrabutyl titanate-absolute ethanol solution was prepared. Adding tetrabutyl titanate into absolute ethyl alcohol, and performing ultrasonic treatment for 15min under the ultrasonic power of 30 kHz. Wherein the volume ratio of the mass of the tetrabutyl titanate to the absolute ethyl alcohol is 6mg:30 mL.
And 4, step 4: preparing the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel. Measuring 5mL of curcumin solution, slowly adding the curcumin solution into 10mL of graphene oxide solution, and carrying out ultrasonic treatment on the obtained mixed solution for 15min to obtain a uniformly dispersed solution; then adding 5mL of tetrabutyl titanate-absolute ethyl alcohol solution, and continuing performing ultrasonic treatment on the mixed solution for 15min to obtain a uniformly dispersed solution; adding 0.8g of ascorbic acid into the mixed solution, and continuing to perform ultrasonic treatment for 15min to obtain a uniformly dispersed solution; and (3) putting the obtained product into an oil bath pot, reacting at the temperature of 80 ℃ for 30min, and cooling to room temperature to obtain the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel.
And 5: preparing the curcumin-titanium dioxide-three-dimensional graphene composite aerogel. Compounding the curcumin-titanium dioxide-three-dimensional grapheneWashing the hydrated gel with deionized water for 2-3 times to remove impurities, then putting the hydrated gel into a freeze-drying machine, wherein the freeze-drying temperature is-30 ℃, the freeze-drying and the vacuum pumping are carried out simultaneously, the vacuum degree is 0.15 torr, and the drying time is 72 hours to obtain the curcumin-titanium dioxide-three-dimensional graphene composite aerogel which is recorded as Cur-TiO2-GA 1. As shown in fig. 1, the figure is a digital photograph of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in this example, fig. 2 is an SEM image of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in this example, and fig. 3 is a pure TiO composite aerogel2Fig. 4 is an XRD pattern of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in this example, and as can be seen from fig. 3 and 4, the curcumin-titanium dioxide-three-dimensional graphene composite aerogel is successfully prepared in this example.
Example 2
The concentration of the curcumin solution in the step 2 in the example 1 is changed to 0.3mg/mL, the concentration of the tetrabutyl titanate-absolute ethyl alcohol solution in the step 3 is changed to 0.3mg/mL, the rest is the same as the example 1, and the aerogel finally obtained is marked as Cur-TiO2-GA2。
Example 3
The concentration of the curcumin solution in the step 2 in the example 1 is changed to 0.4mg/mL, the concentration of the tetrabutyl titanate-absolute ethyl alcohol solution in the step 3 is changed to 0.4mg/mL, the rest is the same as the example 1, and the aerogel finally obtained is marked as Cur-TiO2-GA3。
Example 4
The concentration of the curcumin solution in the step 2 in the example 1 is changed to 0.5mg/mL, the concentration of the tetrabutyl titanate-absolute ethyl alcohol solution in the step 3 is changed to 0.5mg/mL, the rest is the same as the example 1, and the aerogel finally obtained is marked as Cur-TiO2-GA4。
Example 5
The concentration of the curcumin solution in the step 2 in the example 1 is changed to 0.6mg/mL, the concentration of the tetrabutyl titanate-absolute ethyl alcohol solution in the step 3 is changed to 0.6mg/mL, the rest is the same as the example 1, and the aerogel finally obtained is marked as Cur-TiO2-GA5。
The curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment is respectively used for degrading wastewater containing sulfonamides, and the method specifically comprises the following steps:
the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment is respectively added into wastewater with the concentration of the sulfonamide being 100mg/mL, then stirred for 30min at the stirring speed of 1000r/min in the dark, and then the wastewater is irradiated by an ultraviolet lamp, so that the treated wastewater is obtained.
The quality of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel and the sulfonamides
| Cur-TiO2-GA1 | Cur-TiO2-GA2 | Cur-TiO2-GA3 | Cur-TiO2-GA4 | Cur-TiO2-GA5 | |
| Rate of degradation | 72.2％ | 66.9％ | 55.5％ | 40.9％ | 38.2％ |
The volume ratio of the wastewater with the concentration of 100mg/mL is 0.3 g: 500 mL.
TABLE A degradation Rate for the degradation of sulfonamides in a different example
Table 1 shows the degradation rate of sulfonamides when the curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in different examples is used for degrading wastewater containing sulfonamides. Fig. 5 is a graph of degradation rate of curcumin-titanium dioxide-three-dimensional graphene composite aerogel prepared in example one under ultraviolet irradiation for degrading sulfonamides at different times. As can be seen from FIG. 5, the degradation rate of the sulfonamide under the ultraviolet light is 72.2%, and the sulfonamide has great application potential in the degradation of wastewater containing organic pollutants.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.
Claims (10)
1. A preparation method of curcumin-titanium dioxide-three-dimensional graphene composite aerogel is characterized in that curcumin and titanium dioxide are loaded on a graphene oxide three-dimensional structure by a sol-gel method, and the preparation method comprises the following steps:
step one, preparing a graphene oxide solution: adding deionized water into the graphene oxide, and then carrying out ultrasonic treatment at the ultrasonic power of 30 kHz-60 kHz to obtain a brown uniform graphene oxide solution.
Step two, preparing a curcumin solution: adding the curcumin into absolute ethyl alcohol, and then carrying out ultrasonic treatment at the ultrasonic power of 30 kHz-60 kHz to prepare curcumin solution.
Step three, preparing tetrabutyl titanate-ethanol solution: weighing tetrabutyl titanate, adding the tetrabutyl titanate into absolute ethyl alcohol, and performing ultrasonic treatment at an ultrasonic power of 30 kHz-60 kHz to prepare tetrabutyl titanate-ethyl alcohol solution.
Step four, preparing curcumin-titanium dioxide-three-dimensional graphene hydrogel: measuring a curcumin solution, adding the curcumin solution into the graphene oxide solution, and performing ultrasonic dispersion on the obtained mixed solution uniformly; sequentially adding tetrabutyl titanate-ethanol solution and ascorbic acid, and uniformly dispersing by ultrasonic; putting the obtained product into an oil bath pot, loading curcumin and titanium dioxide particles on a graphene oxide three-dimensional structure by a sol-gel method, cooling to room temperature, and taking out to obtain the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel.
Step five, preparing curcumin-titanium dioxide-three-dimensional graphene aerogel: washing the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel with deionized water for 2-3 times to remove impurities, then putting the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel into a freeze-drying machine for freeze drying, and taking out the curcumin-titanium dioxide-three-dimensional graphene composite hydrogel to obtain the curcumin-titanium dioxide-three-dimensional graphene composite aerogel.
2. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the concentration of the graphene oxide solution in the first step is 1-5 mg/mL.
3. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the concentration of the curcumin solution in the second step is 0.1-2 mg/mL.
4. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the concentration of tetrabutyl titanate-ethanol solution in step three is 0.1-2 mg/mL.
5. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the volume ratio of the graphene oxide solution to the curcumin solution in the step four is 1:0.5-1:5, the volume ratio of the graphene oxide solution to the tetrabutyl titanate-ethanol solution is 1:0.5-1:5, and the mass ratio of the graphene oxide to the ascorbic acid is 1:1-1: 20.
6. The preparation method of curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the ultrasound time in the fourth step is 10-40 min.
7. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the reaction temperature in the fourth step is 70-100 ℃ and the reaction time is 1-2 h.
8. The method for preparing curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 1, wherein the temperature of freeze-drying in the step five is-30 to-50 ℃, vacuum is simultaneously pumped during freeze-drying, the vacuum degree is 0.1 to 0.15 torr, and the drying time is 24 to 72 hours.
9. Application of curcumin-titanium dioxide-three-dimensional graphene composite aerogel, which is characterized in that the curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claims 1 to 8 is used for degrading wastewater containing sulfonamides.
10. The application of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel according to claim 9, which comprises the following steps:
adding curcumin-titanium dioxide-three-dimensional graphene composite aerogel into wastewater containing sulfonamide drugs with the concentration of 50-250 mg/mL, stirring at the stirring speed of 500-1000 r/min in the dark for 30-60 min, and irradiating the wastewater for 0.5-3 h by using ultraviolet light to obtain treated wastewater; the volume ratio of the mass of the curcumin-titanium dioxide-three-dimensional graphene composite aerogel to the concentration of the sulfonamide-containing medicament in the wastewater of 50-250 mg/mL (0.05-0.3 g) is 500 mL.
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