CN113877610B - CdS quantum dot modified bismuth-based composite material and preparation method and application thereof - Google Patents

CdS quantum dot modified bismuth-based composite material and preparation method and application thereof Download PDF

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CN113877610B
CN113877610B CN202111221170.9A CN202111221170A CN113877610B CN 113877610 B CN113877610 B CN 113877610B CN 202111221170 A CN202111221170 A CN 202111221170A CN 113877610 B CN113877610 B CN 113877610B
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moo
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冉琪
蒋严波
蒋建谊
兰小威
张龙
吴思仪
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Guangxi Beitou Environmental Water Group Co ltd
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Abstract

The invention discloses a CdS quantum dot modified bismuth-based composite material as well as a preparation method and application thereof, belonging to the technical field of research of visible light catalytic materials and degradation of environmental pollutants. First, Bi (NO) is treated by ultrasonication 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 Preparation of O to obtain Bi 2 MoO 6 The nano microsphere of/BiOCl, CdS quantum dot is fixed on BiOCl/Bi 2 MoO 6 To obtain the target product Bi 2 MoO 6 the/BiOCl/CdS composite material. The composite material is a double II type heterojunction, and realizes the rapid transfer of photoproduction electrons; has photocatalytic degradation performance, has good degradation performance on ciprofloxacin under visible light, and is obviously higher than that of single BiOCl and Bi 2 MoO 6 And degradation properties of CdS.

Description

CdS quantum dot modified bismuth-based composite material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of research on visible light catalytic materials and treatment of environmental pollutants, and particularly relates to a CdS quantum dot modified bismuth-based composite material and a preparation method and application thereof.
Background
Antibiotics are widely used to treat infectious diseases in humans and animals, among which Ciprofloxacin (CIP) belongs to the third generation of broad spectrum fluoroquinolone antibiotics, which are commonly used to treat bacterial infections. However, research shows that less than half of fluoroquinolone medicines can be metabolized after entering a human body, and discharged antibiotics cannot be completely degraded by municipal sewage treatment plants due to poor biodegradability. In addition, CIP also produces various metabolites that are potentially harmful to the environment and even to humans during the deconversion process. Therefore, how to effectively remove the CIP in the wastewater becomes an important research and development issue.
The semiconductor-based photocatalytic degradation technology is considered to be a green and efficient antibiotic wastewater treatment method. During the photocatalytic reaction, the photocatalyst generates electrons (e) under light irradiation - ) And a cavity (h) + ) And further generating an active group (. OH,. O) 2 - ) The active substances can react with pollutants adsorbed on the surface of the photocatalytic material to effectively degrade the pollutants, and secondary pollution is avoided.
Bismuth oxychloride (BiOCl) is an important environmental remediation material with highly exposed active crystal planes. The preparation of the high-activity photocatalyst through crystal surface engineering has huge research potential, but the research on the synergistic effect of the crystal face heterojunction is rarely reported. Bismuth molybdate (Bi) 2 MoO 6 ) Is an important metal oxide with a layered structure, which is prepared from Bi 2 O 2 Layer and octahedral MoO 6 And (3) layer composition. Bi growing on the dominant crystal face constructed on the BiOCl crystal face 2 MoO 6 The electronic transmission performance of the heterogeneous interface can be further enhanced.
The application of bismuth-based materials is often limited by the response capability of visible light, and the combination of bismuth-based materials and narrow-bandgap semiconductors is one of effective methods for solving the problem of poor light response capability. CdS quantum dots (CdS QDs) are visible light catalysts with narrow band gaps, and can utilize thermal electrons or single high-energy photons to generate a plurality of current carriers to improve the photocatalytic activity of materials. And the CdS quantum dots prepared by a hydrothermal method are easy to agglomerate, so that the exposed active crystal face is less. Therefore, there is a need to develop a novel composite material capable of efficiently treating environmental pollutants.
Disclosure of Invention
In order to solve the technical problems, the invention provides a CdS quantum dot modified bismuth-based composite material and a preparation method and application thereof, and Bi is used for preparing the CdS quantum dot modified bismuth-based composite material 2 MoO 6 The double II type heterojunction prepared from BiOCl and CdS transfers electrons rapidly through a heterogeneous interface, realizes high photocatalytic activity, and has the degradation capability of 96% on ciprofloxacin under the illumination condition.
In order to achieve the purpose, the invention provides the following technical scheme:
a CdS quantum dot modified bismuth-system composite material is prepared from Bi (NO) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 Preparing BiOCl/Bi from O 2 MoO 6 After the nano-microsphere, in BiOCl/Bi 2 MoO 6 CdS quantum dots are introduced in situ to obtain Bi 2 MoO 6 BiOCl and CdS as well as Bi composite material constructed by BiOCl and CdS 2 MoO 6 /BiOCl/CdS。
The invention provides a preparation method of a CdS quantum dot modified bismuth-based composite material, which comprises the following steps of:
taking Bi (NO) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 O, NaCl adding into ethylene glycol, respectively, and dispersing in ultrasonic environment for 40-60 min; mixing the three dispersed solutions together, performing ultrasonic treatment for 8-10min, performing microwave reaction, collecting the product after the reaction is finished, washing the product with deionized water and ethanol, and drying to obtain the BiOCl/Bi product 2 MoO 6 The nano-microsphere is marked as X-BOCl/BMO;
(2)BiOCl/Bi 2 MoO 6 preparation of CdS nano-microspheres
Adding CdCl 2 Adding to a solvent; adding thioacetamide and X-BOCl/BMO into another part of solvent; dispersing the two solutions respectively under the ultrasonic condition for 8-10min, then mixing the two solutions, and then adding cyclohexane to limit the growth of CdS particles; slowly adding NaOH until the solution turns yellow; filtering and collecting the precipitate and drying to obtain the final product, namely the composite material Bi 2 MoO 6 /BiOCl/CdS, denoted BMO/BOCl/CdS. X is the molar ratio of NaCl.
Further, said Bi (NO) of step (1) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 O, NaCl is in a molar ratio of 1:2: 1-2.
Further, the power of the microwave reaction in the step (1) is 800W; the temperature is programmed to 160 ℃ in three times, the temperature is increased from room temperature to 120 ℃ for the first time and is kept constant for 8-10min, the temperature is increased from 120 ℃ to 150 ℃ for the second time and is kept constant for 8-10min, and the temperature is increased to 120 ℃ for the third time and is kept constant for 8-10 min.
Further, the solvent in the step (2) is 0.05-0.1mol/L hexadecyl trimethyl ammonium bromide water solution.
Further, the CdCl of step (2) 2 The plastid ratio of the solvent is 114: 20; the plastid ratio of the thioacetamide to the X-BOCl/BMO to the solvent is 38:50-150: 20.
Further, the concentration of NaOH in the step (2) is 1.25 mol/L; the dosage ratio of the cyclohexane to the NaOH is 0.5-1.5: 8; when the NaOH is dripped into the solution, the dripping number is controlled within 80 drops.
Further, the drying in the steps (1) and (2) is drying for 10-12h at 60 ℃.
The invention provides an application of a CdS quantum dot modified bismuth-based composite material, wherein the composite material is used for photodegrading organic pollutants under the irradiation of visible light.
Furthermore, the degradation rate of the composite material for ciprofloxacin under visible light reaches over 96%.
The invention has the following beneficial effects:
1. the invention prepares ternary Bi by a simple two-step synthesis method 2 MoO 6 the/BiOCl/CdS composite material is a double II-type heterojunction and is used as a photocatalyst, and the method greatly promotes the separation of current carriers and obviously promotes the photocatalytic degradation activity.
2. The invention prepares CdS with dispersed quantum size of CdS QDs by a template method, fully exposes active sites, responds to visible light to the maximum extent, and loads the CdS QDs to BiOCl/Bi 2 MoO 6 Surface construction of Bi 2 MoO 6 the/BiOCl/CdS heterojunction widens the visible light response range of the material and promotes the quick separation of photon-generated carriers, so that the photocatalytic performance of the material is further improved, and the removal rate of ciprofloxacin under the visible light condition reaches 96%.
3. The material provided by the invention is combined with a room temperature synthesis method by combining a microblog auxiliary synthesis method, is simple to operate, low in production cost and high in synthesis purity, can still maintain high photocatalytic activity after repeated use, presents good stability, and is suitable for expanded industrial application.
Drawings
FIG. 1 is a sample X-ray powder diffraction contrast diagram of a material to be examined according to the present invention.
FIG. 2 is a high resolution transmission electron micrograph of the composite material 100-BMO/BOCl/CdS of the present invention.
FIG. 3 is a Raman spectrum of a sample of the material to be examined according to the present invention.
FIG. 4 is a comparison graph of the UV-visible diffuse reflectance spectra of a sample of a material to be inspected according to the present invention.
FIG. 5 is a diagram showing the effect of degrading ciprofloxacin by photocatalysis of a sample of the material to be detected.
FIG. 6 is a diagram of the photocatalytic mechanism of the composite material 100-BMO/BOCl/CdS of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following detailed description and the accompanying drawings, but the invention is not limited to the scope of protection. The following raw materials were purchased from chemical raw materials companies at home and abroad.
Example 1
(1)BiOCl/Bi 2 MoO 6 Preparation of nano-microspheres
Taking Bi (NO) 3 ) 3 ·5H 2 O(1mmol)、Na 2 MoO 4 ·2H 2 O(2mmolNa 2 MoO 4 ·2H 2 O) and NaCl (1.75mmol) are respectively added into 15 ml of ethylene glycol and are subjected to ultrasonic dispersion for 60 min;
mixing the three dispersed solutions together, performing ultrasonic treatment for 10min, and then putting the mixture into a microwave-assisted synthesizer for reaction to prepare BiOCl/Bi 2 MoO 6 ；
Finally, collecting the product, washing with deionized water and ethanol for several times, drying at 60 ℃ for 12h, collecting the product and marking as 1.75-BOCl/BMO;
(2)BiOCl/Bi 2 MoO 6 preparation of CdS nano-microspheres
114mg of CdCl 2 Adding into 20ml (0.08mol/L) CTAB water solution;
38mg thioacetamide and 50mg 1.75-BOCl/BMO are added to another 20ml CTAB aqueous solution;
dispersing the two solutions for 10min under ultrasonic condition, mixing, and adding 1ml cyclohexane; after 8 ml NaOH (1.25mol/L) was added dropwise to the solution, the amount was controlled at 80 drops, and finally the product was collected by filtration, washed several times with deionized water and ethanol, and then dried at 60 ℃ for 12h, and collected, and labeled as 50-BMO/BOCl/CdS.
Example 2
(1)BiOCl/Bi 2 MoO 6 Preparation of nano-microspheres
Taking Bi (NO) 3 ) 3 ·5H 2 O(1mmol)、Na 2 MoO 4 ·2H 2 O(2mmolNa 2 MoO 4 ·2H 2 O) and NaCl (1.25mmol) are respectively added into 15 ml of ethylene glycol and are subjected to ultrasonic dispersion for 60 min;
mixing the three dispersed solutions together, performing ultrasonic treatment for 10min, and then putting the mixture into a microwave-assisted synthesizer for reaction to prepare BiOCl/Bi 2 MoO 6 ；
Finally, collecting the product, washing with deionized water and ethanol for several times, drying at 60 ℃ for 12h, collecting the product and marking as 1.25-BOCl/BMO;
(2)BiOCl/Bi 2 MoO 6 preparation of CdS nano-microsphere
114mg of CdCl 2 Added to 20ml (0.05mol/L) of aqueous CTAB solution;
38mg of thioacetamide and 100mg of 1.25-BOCl/BMO are added to a further 20ml (0.05mol/L) of aqueous CTAB solution;
dispersing the two solutions for 10min under ultrasonic condition, mixing, and adding 0.5 ml cyclohexane; after 8 ml of NaOH (1.25mol/L) was added dropwise to the solution, the amount of drops was controlled to 80 drops. Finally, the product was collected by filtration, washed several times with deionized water and ethanol, then dried at 60 ℃ for 12h and collected, labeled 100-BMO/BOCl/CdS.
Example 3
(1)BiOCl/Bi 2 MoO 6 Of nanovesiclesPreparation of
1mmol of Bi (NO) is taken 3 ) 3 ·5H 2 O、2mmol Na 2 MoO 4 ·2H 2 O and 2mmol NaCl are respectively added into 15 ml ethylene glycol and are subjected to ultrasonic dispersion for 60 min;
mixing the three dispersed solutions together, performing ultrasonic treatment for 10min, and then putting the mixture into a microwave-assisted synthesizer for reaction to prepare BiOCl/Bi 2 MoO 6 ；
Finally, collecting the product, washing the product for a plurality of times by deionized water and ethanol, then drying the product for 12h at the temperature of 60 ℃, and collecting the product and marking the product as 2-BOCl/BMO;
(2)BiOCl/Bi 2 MoO 6 preparation of CdS nano-microsphere
114mg of CdCl 2 Adding into 20ml (0.1mol/L) CTAB water solution;
38mg of thioacetamide and 150mg of 2-BOCl/BMO are added to a further 20ml (0.1mol/L) of aqueous CTAB solution;
dispersing the two solutions for 10min under ultrasonic condition, mixing, and adding 1.5 ml cyclohexane; after 8 ml of NaOH (1.25mol/L) was added dropwise to the solution, the amount of drops was controlled to 80 drops.
The product was filtered and collected, washed several times with deionized water and ethanol, then dried at 60 ℃ for 12h and collected, labeled 150-BMO/BOCl/CdS.
Comparative example 1 Synthesis of CdS Quantum dots
CdS QDs are synthesized by adopting a room temperature template method. The synthesis method comprises the following steps: 144 mg of CdCl 2 And 38mg of thioacetamide were added to 20ml of cetyltrimethylammonium bromide (0.08mol/L, CTAB), respectively, and each was ultrasonically dispersed for 10 min. The two solutions were then mixed with continued sonication and cyclohexane (1mL) was added. At the same time, NaOH (1.25mol/L) was added dropwise to the solution using a microinjector measuring 10 uL. Finally, the product was washed three times with ethanol and dried overnight at 60 ℃ and the obtained product was labelled CdS.
Comparative example 2 Synthesis of Bi 2 MoO 6 Nano microsphere
1mmol of Bi (NO) 3 ) 3 ·5H 2 O and 2mmol Na 2 MoO 4 ·2H 2 And O is respectively added into 15 ml of ethylene glycol, and ultrasonic dispersion is carried out for 60 min. Subsequently, Na is added 2 MoO 4 ·2H 2 O solution and Bi (NO) 3 ) 3 ·5H 2 Mixing the O solution and carrying out ultrasonic treatment for 10 min. The solution was transferred to a 100 ml inner tank, placed in a microwave reactor with a controlled power of 800W, and after the temperature programming was maintained at 160 ℃ for 10 min. Finally, collecting Bi 2 MoO 6 The product, washed several times with deionized water and ethanol, dried overnight at 60 ℃, and the product obtained was labeled BMO.
Comparative example 3 Synthesis of BiOCl nanospheres
1mmol of Bi (NO) 3 ) 3 ·5H 2 O and 1.75mmol NaCl are respectively added into 15 ml ethylene glycol and ultrasonically dispersed for 60 min. Subsequently, the NaCl solution is mixed with Bi (NO) 3 ) 3 ·5H 2 The O solution was mixed and the sonication was maintained for 10 min. And keeping the constant temperature hydrothermal reaction at 160 ℃ for 10 min. Finally, the product, labeled BOCl, was collected, washed several times with deionized water and ethanol, and then dried at 60 ℃ for 12 h.
Comparative example 4
Preparation of 100-BMO/CdS
114mg of CdCl 2 Adding into 20ml (0.08mol/L) CTAB water solution;
38mg thioacetamide and 100mg BMO are added to another 20ml (0.08mol/L) CTAB aqueous solution;
dispersing the two solutions for 10min under ultrasonic condition, mixing, and adding 1ml cyclohexane; after 8 ml of NaOH (1.25mol/L) was added dropwise to the solution, the amount of drops was controlled to 80 drops.
Finally, the product was collected by filtration, washed several times with deionized water and ethanol, and then collected after drying at 60 ℃ for 12h, labeled 100-BMO/CdS.
Comparative example 5
Preparation of 100-BOCl/CdS
114mg of CdCl 2 Adding into 20ml (0.08mol/L) CTAB water solution;
38mg thioacetamide and 100mg BOCl are added to a further 20ml aqueous CTAB solution;
dispersing the two solutions for 10min under ultrasonic condition, mixing, and adding 1ml cyclohexane; after 8 ml of NaOH (1.25mol/L) was added dropwise to the solution, the amount of drops was controlled to 80 drops.
Finally, the product was collected by filtration, washed several times with deionized water and ethanol, then dried at 60 ℃ for 12h and collected, labeled as 100-BOCl/CdS.
Firstly, the following characterization and analysis are carried out on the following materials to be detected
Material to be detected: 1.75-BOCl/BMO, 50-BMO/BOCl/CdS in example 1, 100-BMO/BOCl/CdS in example 2, 150-BMO/BOCl/CdS in example 3, CdS quantum dots in comparative example 1, BMO in comparative example 2, BOCl in comparative example 3, 100-BMO/CdS in comparative example 4, and 100-BOCl/CdS in comparative example 5.
The detection method comprises the following steps: x-ray diffraction scanning, transmission electron microscope scanning, Raman spectrum analysis and ultraviolet visible diffuse reflection spectrum analysis.
And (3) detection results:
FIG. 1 is a sample X-ray powder diffraction contrast diagram of a material to be examined according to the present invention. FIG. 2 is a high resolution transmission electron micrograph of the composite material 100-BMO/BOCl/CdS of the present invention. The X-ray powder diffraction pattern of fig. 1 and the transmission electron micrograph of fig. 2 show that: the nanorod structure shown in fig. 2a has a lattice spacing of 0.72nm, corresponding to the (001) crystal plane of BOCl; the lattice spacing of the material in FIG. 2b is 0.27nm and 0.33nm, respectively attributed to the (110) crystal plane of BOCl and to the (111) crystal plane of CdS.
FIG. 3 is a Raman spectrum of a sample of the material to be examined according to the present invention. As can be seen from FIG. 3, BMO, BOCl and 1.75-BOCl/BMO were at 72cm -1 The peak value can be attributed to Bi 0 Eg vibration mode of (1). BOCl and 1.75-BOCl/BMO at 146cm -1 And a characteristic peak appears at the position, belonging to A1g vibration mode of Bi. At 300cm -1 And 598cm -1 The diffraction peaks of CdS quantum dots respectively correspond to the first-order longitudinal optical phonon (1LO) and the second-order phonon peak (2LO) of CdS. CdS phonon peak is not detected in 100-BMO/CdS and 100-BOCl/CdS composite materials, but the peak is detected along with 1.75-BOCl/BMO (50-BMO/BO)Cl/CdS, 100-BMO/BOCl/CdS, and 150-BMO/BOCl/CdS) concentration, CdS intensity appeared and gradually increased. The coexistence of BMO, BOCl and CdS is further confirmed, and meanwhile, the construction of a BMO/BOCl binary sample is favorable for the compounding of CdS quantum dots.
FIG. 4 is a comparison graph of the UV-visible diffuse reflectance spectra of a sample of a material to be inspected according to the present invention. As shown in FIG. 4, the light absorption ranges of pure BOCl and BMO are narrow, the absorption edges are 382nm and 486nm, respectively, and the light absorption edge of pure CdS can reach the near infrared region of 584 nm. In the ternary composite material BMO/BOCl/CdS, the red shift amplitude is larger and larger along with the increase of the 1.75-BMO/BOCl content in the component, and the ternary composite material presents stronger response capability to visible light.
Secondly, performing photocatalytic degradation on the composite material to degrade organic wastewater and analyzing
The photocatalytic degradation activity of the BMO/BOCl/CdS composite material synthesized by the method is detected by degrading ciprofloxacin solution under the irradiation of simulated sunlight.
The detection method comprises the following steps: the degradation activity of the prepared photocatalytic material (CdS, BMO, BOCl, 1.75-BOCl/BMO, 100-BMO/CdS, 100-BOCl/CdS, 50-BMO/BOCl/CdS, 100-BMO/BOCl/CdS, 150-BMO/BOCl/CdS) was evaluated using ciprofloxacin as a model contaminant. 10 mg of the photocatalyst was weighed out and dispersed in 100 ml of an aqueous ciprofloxacin (20 mg/L) solution. The adsorption capacity and photocatalytic activity of the prepared samples were studied in a glass apparatus equipped with a circulating cooling water system.
A300W xenon lamp and a cut-off filter (. lamda. >400nm) were used as the visible light source. In general, magnetic stirring was carried out for 30min in the dark to reach the adsorption-desorption equilibrium of ciprofloxacin, and then the light source of a xenon lamp was turned on to carry out the photocatalytic experiment.
2 ml of the suspension were taken every 15min and the suspension was filtered through a nylon filter with a pore size of 0.22 μm. The absorbance of ciprofloxacin was measured at the absorption peak at 275nm with an ultraviolet-visible spectrophotometer (UV-5100, METASH, Shanghai, p.r. china) and the degradation rate was calculated. The cuvette used was a quartz cuvette, and the absorbance value of the water before measurement of the sample was zero.
FIG. 5 is a graph showing the effect of degrading ciprofloxacin by photocatalysis of a sample of the material to be detected. As shown in FIG. 5, under the condition of simulated sunlight, the ternary composite 100-BMO/BOCl/CdS photocatalyst has stronger photocatalytic degradation performance, and the degradation rate of ciprofloxacin under 60min illumination can reach 96%.
FIG. 6 is a diagram of the photocatalytic mechanism of the composite material 100-BMO/BOCl/CdS of the present invention. The photocatalytic performance enhancement is mainly due to the rapid separation of the photogenerated carriers. The migration path in the ternary composite follows the double type II heterostructure shown in fig. 6. The composite material generates e under the response of visible light - And h + And further generating an active group (. OH,. O) 2 - ) The active substances can react with ciprofloxacin adsorbed on the surface of the photocatalytic material, and the efficient degradation of the ciprofloxacin is realized due to the strong oxidation-reduction capability of the BMO/BOCl/CdS.
The above description only creates a better embodiment for the present invention, but the scope of the present invention is not limited thereto, and the application field can relate to the photocatalytic degradation of organic wastewater and the photocatalytic reduction of CO 2 The field of hydrogen production by photocatalytic decomposition.

Claims (8)

1. The CdS quantum dot modified bismuth-based composite material is characterized by utilizing Bi (NO) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 Preparing BiOCl/Bi from O 2 MoO 6 After the nano-microsphere, in BiOCl/Bi 2 MoO 6 CdS quantum dots are introduced in situ to obtain Bi 2 MoO 6 BiOCl and CdS as well as Bi composite material constructed by BiOCl and CdS 2 MoO 6 /BiOCl/CdS；
The preparation method of the CdS quantum dot modified bismuth-based composite material comprises the following steps of:
（1）BiOCl/Bi 2 MoO 6 preparation of nano-microspheres
Taking Bi (NO) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 O, NaCl adding into ethylene glycol, respectively, and dispersing in ultrasonic environment for 40-60 min; mixing the three dispersed solutions, andultrasonic treatment is carried out for 8-10min, then microwave reaction is carried out, products are collected after the reaction is finished, and the products are washed by deionized water and ethanol and dried to obtain BiOCl/Bi products 2 MoO 6 The nano-microsphere is marked as X-BOCl/BMO;
（2）BiOCl/Bi 2 MoO 6 preparation of CdS nano-microsphere
Adding CdCl 2 Adding to a solvent; adding thioacetamide and X-BOCl/BMO into another part of solvent; dispersing the two solutions respectively under the ultrasonic condition for 8-10min, then mixing the two solutions, and then adding cyclohexane to limit the growth of CdS particles; slowly adding NaOH until the solution turns yellow; filtering, collecting and drying the precipitate to obtain the final product, namely the composite material Bi 2 MoO 6 /BiOCl/CdS, denoted BMO/BOCl/CdS.
2. The CdS quantum dot modified bismuth-based composite material as defined in claim 1, wherein Bi (NO) is used in step (1) 3 ) 3 ·5H 2 O、Na 2 MoO 4 ·2H 2 O, NaCl is in a molar ratio of 1:2: 1-2.
3. The CdS quantum dot modified bismuth-based composite material as claimed in claim 1, wherein the solvent in step (2) is 0.05-0.1mol/L hexadecyl trimethyl ammonium bromide aqueous solution.
4. The CdS quantum dot modified bismuth-based composite material as defined in claim 1, wherein the CdCl in step (2) 2 The plastid ratio of the solvent is 114-120 mg: 20 mL; the plastid ratio of the thioacetamide, X-BOCl/BMO and the solvent is 38 mg: 50-150 mg: 20 mL.
5. The CdS quantum dot modified bismuth-based composite material as defined in claim 1, wherein the concentration of NaOH in step (2) is 1.25 mol/L; the volume ratio of the cyclohexane to the NaOH is 0.5-1.5: 8; when the NaOH is dripped into the solution, the dripping number is controlled within 80 drops.
6. The CdS quantum dot modified bismuth-based composite material as defined in claim 1, wherein the drying in steps (1) and (2) is performed at 55-60 deg.C for 10-12 h.
7. The use of the CdS quantum dot modified bismuth-based composite material as defined in claim 1, wherein the composite material is used for photodegradation of organic pollutants under visible light.
8. The application of the CdS quantum dot modified bismuth-based composite material as claimed in claim 7, wherein the degradation rate of ciprofloxacin in the composite material under visible light is above 96%.
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