阅读说明：本技术 一种双金属氧化物量子点和氮化碳纳米片的复合材料和制备方法及其应用 (Composite material of bimetallic oxide quantum dots and carbon nitride nanosheets, preparation method and application thereof ) 是由 夏红 刘铭恩 鲁福身 杨文欣 陈钊彬 刘潇宇 于 2020-12-30 设计创作，主要内容包括：本发明涉及一种双金属氧化物量子点和氮化碳纳米片的复合材料,包括连续相氮化碳纳米片,以及分散相铜氧化物量子点和铁氧化物量子点。其结构上具有较大比表面积和缺陷,可为光-芬顿催化提供更多的活性位点,提高芬顿反应的活性。所述双金属氧化物量子点和氮化碳纳米片的复合材料中,超薄氮化碳纳米片具有大量氮配位,以氮化碳纳米片作为载体,能有效锚定铜铁氧化物量子点,防止金属纳米粒子之间的团聚,促进Fe(Ⅲ)/Fe(Ⅱ)转化,同时,Fe～(3+)作为电子受体,可抑制氮化碳纳米片中光生电子-空穴对的复合,从而提高光-芬顿氧化降解有机污染物四环素的效率,弥补了现有技术的不足。(The invention relates to a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets, which comprises continuous-phase carbon nitride nanosheets, and dispersed-phase copper oxide quantum dots and iron oxide quantum dots. The structure of the photocatalyst has larger specific surface area and defects, can provide more active sites for photo-Fenton catalysis, and improves the activity of Fenton reaction. In the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets, the ultrathin carbon nitride nanosheets have a large number of nitrogen coordination, and the carbon nitride nanosheets are used as carriers, so that the copper-iron oxide quantum dots can be effectively anchored, the agglomeration among metal nanoparticles is prevented, the Fe (III)/Fe (II) conversion is promoted, and meanwhile, the Fe 3+ As an electron acceptor, the compound of photogenerated electron-hole pairs in the carbon nitride nanosheet can be inhibited, so that the efficiency of degrading the organic pollutant tetracycline by light-Fenton oxidation is improved, and the defects of the prior art are overcome.)

1. The composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets is characterized by comprising

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

2. A composite of bimetallic oxide quantum dots and carbon nitride nanoplates as in claim 1, wherein the average particle size of the copper oxide quantum dots and iron oxide quantum dots is 1.5-2.5 nm.

3. The composite of bimetallic oxide quantum dots and carbon nitride nanoplates as in claim 1, wherein the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 9:1-3: 7.

4. A method of preparing a composite of bimetallic oxide quantum dots and carbon nitride nanoplates as claimed in any of claims 1-3, comprising the steps of:

s1, heating urea at the temperature of 500-550 ℃, preserving heat, and calcining to obtain carbon nitride nanosheets;

s2, mixing the carbon nitride nanosheets with alcohol to obtain a suspension;

s3, adding water-soluble metal salt and ammonium salt into the suspension, and uniformly stirring to obtain a mixed solution;

s4, filtering and drying the mixed solution; then heating and annealing are carried out to obtain the product.

5. The method for preparing a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets as claimed in claim 4, wherein the heating of step S1 is a two-stage heating.

6. The method for preparing a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets as claimed in claim 4, wherein the holding time of step S1 is 2-4 h.

7. The method of preparing a composite of bimetallic oxide quantum dots and carbon nitride nanoplates as in claim 4, wherein the alcohol of step S2 is selected from methanol, ethanol, isopropanol or n-butanol.

8. The method for preparing a composite of bimetallic oxide quantum dots and carbon nitride nanosheets as claimed in claim 4, wherein the water-soluble metal salt of step S3 is selected from anhydrous FeCl₃、FeCl₃·6H₂O、Fe(NO₃)₃·9H₂O、FeSO₄·7H₂At least one of O, and anhydrous CuSO₄、CuCl₂·2H₂O、Cu(NO₃)₂·3H₂O、CuSO₄·5H₂At least one of O.

9. The method for preparing a composite of bimetallic oxide quantum dots and carbon nitride nanosheets as claimed in claim 4, wherein the ammonium salt of step S3 is selected from NH₄HCO₃、NH₄HSO₄One or two of (1).

10. Use of a composite of bimetallic oxide quantum dots according to any one of claims 1 to 3 and carbon nitride nanoplates in the field of photo-fenton catalysis.

Technical Field

The invention belongs to the field of catalyst materials, and particularly relates to a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets, a preparation method and application thereof.

Background

Water pollution caused by organic pollutants poses a serious threat to the environment and human health. Fenton (Fenton) and Photo-Fenton (Photo-Fenton) oxidation play an important role in water purification and treatment of organic contaminants in water. Classical homogeneous Fenton reaction from Fe²⁺/H₂O₂Composition of Fe²⁺Can catalyze H₂O₂The two substances generate electron transfer to generate active substances such as hydroxyl free radicals (. OH) and the like, further oxidize organic compounds in the sewage and convert the organic compounds into low-toxicity or even non-toxic compounds, and neither special reactants nor special devices are needed. Nevertheless, the use of homogeneous Fenton reactions is largely hampered by the disadvantage that H is present₂O₂And Fe²⁺The dosage is large; the optimal pH range is narrow (pH ≈ 3), requiring large amounts of acid to maintain; excess ferric iron hydroxide sludge is generated. In order to solve the problems of the homogeneous fenton reaction, many researchers have been gradually focusing on heterogeneous fenton catalysis.

Iron-based materials, such as metallic iron oxides, are widely used in Fenton's reactions due to their high properties, low cost, low toxicity, etc., and iron can be stabilized in the structure of the catalyst in heterogeneous catalytic systems, effectively from H₂O₂The intermediate excitation generates OH, thereby preventing the secondary pollution to the environment caused by the obvious leaching of iron ions and the generation of iron mud, and simultaneously, the iron-based composite material can be used for a plurality of times. However, heterogeneous iron-based fenton catalysts have poor activity due to low surface iron content, poor dispersion, and slow Fe (iii)/Fe (ii) conversion. In recent years, some research has been into semiconductor materials (e.g., TiO)₂、BiVO₄And g-C₃N₄) In combination with a heterogeneous fenton catalyst, the catalytic activity of fenton is enhanced by electrons continuously generated by the semiconductor. Graphite-like Carbon Nitride Nanosheets (CNNS) are a promising visible light response material, have a large number of nitrogen coordination, are ideal metal anchoring carriers, and can generate additional active oxygen species by solar drive so as to improve the degradation efficiency and promote Fe (III)/Fe (II) conversion to a certain extent. However, since the semiconductor has poor charge separability, the transport is slow, and the improvement effect is not satisfactory. Therefore, how to construct the iron-based composite material with excellent photo-Fenton performance by using the carbon nitride nanosheets has great significance and practical value.

Disclosure of Invention

The invention reports a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets, which structurally has large specific surface area and defects, can provide more active sites for photo-Fenton catalysis, and improves the activity of Fenton reaction. In the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets, the ultrathin carbon nitride nanosheets have a large number of nitrogen coordination, and the carbon nitride nanosheets are used as carriers, so that the copper-iron oxide quantum dots can be effectively anchored, the agglomeration among metal nanoparticles is prevented, the Fe (III)/Fe (II) conversion is promoted, and meanwhile, the Fe³⁺As an electron acceptor, the composite of photogenerated electron-hole pairs in the carbon nitride nanosheet can be inhibited, thereby making up for the deficiencies of the prior art.

One object of the present invention is to provide a composite material of bimetallic oxide quantum dots and carbon nitride nanosheets, which is achieved by the following technical means:

a composite material of bimetal oxide quantum dots and carbon nitride nanosheets comprises

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

Further, the average particle size of the copper oxide quantum dots and the iron oxide quantum dots is 1.5-2.5 nm.

Further, the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 9:1-3: 7.

Another object of the present invention is to provide a preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets, which is achieved by the following technical means:

the preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets comprises the following steps:

s1, heating urea at the temperature of 500-550 ℃, preserving heat, and calcining to obtain carbon nitride nanosheets;

s2, mixing the carbon nitride nanosheets with alcohol to obtain a suspension;

s3, adding water-soluble metal salt and ammonium salt into the suspension, and uniformly stirring to obtain a mixed solution;

s4, filtering and drying the mixed solution; then heating and annealing are carried out to obtain the product.

Further, the heating of step S1 is two-stage heating.

Further, the heat preservation time of the step S1 is 2-4 h.

Further, the alcohol of step S2 is selected from methanol, ethanol, isopropanol, or n-butanol.

Further, the water-soluble metal salt in step S3 is selected from anhydrous FeCl₃、FeCl₃·6H₂O、Fe(NO₃)₃·9H₂O、FeSO₄·7H₂O, anhydrous CuSO₄、CuCl₂·2H₂O、Cu(NO₃)₂·3H₂O、CuSO₄·5H₂One or more of O.

Further, the ammonium salt in step S3 is selected from NH₄HCO₃、NH₄HSO₄One or two of (1).

The invention also aims to provide application of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets in the field of photo-Fenton catalysis.

The invention has the beneficial effects that:

(1) the novel composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets is designed and synthesized by methods such as thermal polymerization, wherein the carbon nitride nanosheets not only have good visible light response, but also have a large number of nitrogen coordination, and can effectively anchor the metallic oxide quantum dots, so that the Fenton oxidation performance of the composite material is improved; meanwhile, by adding the copper oxide quantum dots and the iron oxide quantum dots, the separation of photo-generated electrons and holes on the surface of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets can be promoted, so that the photocatalytic capacity of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets is further improved.

(2) The composite material has simple preparation process, and the raw materials used in the preparation process are common ammonium salt and metal salt which are both simple and easily obtained materials, so that the composite material cannot cause environmental pollution.

(3) The composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets prepared by the method is used as a photo-Fenton catalyst, and has excellent degradation performance on organic pollutant Tetracycline (TC); meanwhile, the synergistic effect between the copper oxide quantum dots and the iron oxide quantum dots has a certain promotion effect on the adsorption of TC, so that the capacity of degrading TC of the composite material is further improved.

Drawings

Fig. 1 is an X-ray diffraction (XRD) spectrum of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets of example 1.

Fig. 2 (a) and (b) are Scanning Electron Microscope (SEM) images of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets of example 1 at scales of 1 μm and 200nm, respectively.

Fig. 3 (a) and (b) are Transmission Electron Microscope (TEM) images of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets in example 1 at scales of 500nm and 100nm, respectively.

Fig. 4 is a test result of a photo-fenton performance test of the composite material of the bimetal oxide quantum dots and the carbon nitride nanosheets in test example 1, and the samples in comparative experiment 1 and comparative experiment 2.

Fig. 5 (a) is a graph comparing photo-fenton performance tests of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets in test example 1 and the composite of the iron oxide quantum dots and the carbon nitride nanosheets in comparative experiment 3;

fig. 5 (b) is a reaction kinetics chart of a photo-fenton performance test of the composite of the bimetallic oxide quantum dot and the carbon nitride nanosheet in test example 1 and the composite of the iron oxide quantum dot and the carbon nitride nanosheet in comparative experiment 3.

Detailed Description

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Example 1

A composite material of bimetal oxide quantum dots and carbon nitride nanosheets comprises

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

Wherein the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 7: 3; the average particle size of the copper oxide quantum dots and the iron oxide quantum dots is 2.2 nm.

The preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets comprises the following steps:

s1, adding urea into a crucible with a cover, placing the crucible in a muffle furnace, heating the crucible to 550 ℃ at the speed of 2.5 ℃/min, and keeping the temperature for 4 hours as a first stage; then cooling the obtained crude product, opening a crucible cover, heating the crude product to 500 ℃ in a muffle furnace at the speed of 5 ℃/min, keeping the temperature for 2h as the second stage heating, and calcining the obtained product to obtain carbon nitride nanosheets;

s2.900 mg of carbon nitride nanosheets are placed in a 250mL beaker, 90mL of absolute ethyl alcohol is added, and ultrasonic dispersion is carried out for 90min to uniformly disperse the carbon nitride nanosheets so as to obtain a suspension;

s3, adding 1mmol CuCl in total into the suspension₂·2H₂O and FeCl₃·6H₂O(CuCl₂·2H₂O and FeCl₃·6H₂Molar ratio of O7: 3), then 3mmol of NH were added₄HCO₃Continuously stirring for 8 hours at room temperature to obtain a mixed solution;

s4, centrifugally separating the mixed solution, washing the mixed solution for a plurality of times by using distilled water and absolute ethyl alcohol, and putting the collected solid catalyst into a 40 ℃ oven for vacuum drying overnight. And finally, heating the prepared precursor to 350 ℃ in a muffle furnace at the speed of 5 ℃/min, and annealing for 2h to obtain the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets.

Fig. 1 is an X-ray diffraction (XRD) spectrum of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets of example 1. The figure shows two diffraction peaks of 13.0 degrees and 27.4 degrees, which are respectively assigned to the (100) crystal face and the (002) crystal face of the carbon nitride nanosheet, and shows that the addition of the copper oxide quantum dots and the iron oxide quantum dots does not cause the change of the crystal structure of the carbon nitride nanosheet. Meanwhile, diffraction peaks of the copper oxide quantum dots and the iron oxide quantum dots are not observed in the figure, which shows that the bimetallic oxide quantum dots are low in load, small in particle size and dispersed.

Fig. 2 (a) and (b) are Scanning Electron Microscope (SEM) images of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets of example 1 at scales of 1 μm and 200nm, respectively. The morphology of the composite of bimetallic oxide quantum dots and carbon nitride nanosheets is shown in fig. 2 (a) and (b), which consists of a plurality of curved ultrathin nanoflakes having a large number of folds sufficient to expose active sites for catalytic reactions.

Fig. 3 (a) and (b) are Transmission Electron Microscope (TEM) images of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets in example 1 at scales of 500nm and 100nm, respectively. The synthesized carbon nitride nanosheet layer is shown to be thin. In the figure, black dots are copper oxide quantum dots and iron oxide quantum dots loaded on carbon nitride nanosheets, and the tiny bimetallic oxide quantum dots are uniformly dispersed on the ultrathin carbon nitride nanosheet carrier. Because a large amount of nitrogen coordination exists on the carbon nitride nanosheet carrier, the quantum dots do not have obvious agglomeration.

Example 2

A composite material of bimetal oxide quantum dots and carbon nitride nanosheets comprises

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

Wherein the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 5: 5; the average particle size of the copper oxide quantum dots and the iron oxide quantum dots is 2.4 nm.

The preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets comprises the following steps:

s1, adding urea into a crucible with a cover, placing the crucible in a muffle furnace, heating to 540 ℃ at the speed of 2.5 ℃/min, heating as a first stage, and keeping for 4 hours; then cooling the obtained crude product, opening a crucible cover, heating to 520 ℃ in a muffle furnace at the speed of 5 ℃/min, keeping for 2h as second-stage heating, and calcining the obtained product to obtain carbon nitride nanosheets;

s2.900 mg of carbon nitride nanosheets are placed in a 250mL beaker, 90mL of absolute ethyl alcohol is added, and ultrasonic dispersion is carried out for 90min to uniformly disperse the carbon nitride nanosheets so as to obtain a suspension;

s3, adding 1mmol CuCl in total into the suspension₂·2H₂O and FeCl₃·6H₂O(CuCl₂·2H₂O and FeCl₃·6H₂Molar ratio of O5: 5), then 3mmol of NH were added₄HCO₃Continuously stirring for 8 hours at room temperature to obtain a mixed solution;

s4, centrifugally separating the mixed solution, washing the mixed solution for a plurality of times by using distilled water and absolute ethyl alcohol, and putting the collected solid catalyst into a 40 ℃ oven for vacuum drying overnight. And finally, heating the prepared precursor to 350 ℃ in a muffle furnace at the speed of 5 ℃/min, and annealing for 2h to obtain the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets.

Example 3

A composite material of bimetal oxide quantum dots and carbon nitride nanosheets comprises

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

Wherein the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 3: 7; the average particle size of the copper oxide quantum dots and the iron oxide quantum dots is 2.5 nm.

The preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets comprises the following steps:

s1, adding urea into a crucible with a cover, placing the crucible in a muffle furnace, heating to 530 ℃ at the speed of 2.5 ℃/min, heating as a first stage, and keeping for 4 hours; then cooling the obtained crude product, opening a crucible cover, heating to 510 ℃ in a muffle furnace at the speed of 5 ℃/min, keeping for 2h as second-stage heating, and calcining the obtained product to obtain carbon nitride nanosheets;

s2.900 mg of carbon nitride nanosheets are placed in a 250mL beaker, 90mL of absolute ethyl alcohol is added, and ultrasonic dispersion is carried out for 90min to uniformly disperse the carbon nitride nanosheets so as to obtain a suspension;

s3, adding 1mmol CuCl in total into the suspension₂·2H₂O and FeCl₃·6H₂O(CuCl₂·2H₂O and FeCl₃·6H₂Molar ratio of O3: 7), then 3mmol of NH were added₄HCO₃Continuously stirring for 8 hours at room temperature to obtain a mixed solution;

s4, centrifugally separating the mixed solution, washing the mixed solution for a plurality of times by using distilled water and absolute ethyl alcohol, and putting the collected solid catalyst into a 40 ℃ oven for vacuum drying overnight. And finally, heating the prepared precursor to 350 ℃ in a muffle furnace at the speed of 5 ℃/min, and annealing for 2h to obtain the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets.

Example 4

A composite material of bimetal oxide quantum dots and carbon nitride nanosheets comprises

Continuous phase carbon nitride nanosheets; and

dispersed phase copper oxide quantum dots and iron oxide quantum dots.

Wherein the molar ratio of the copper oxide quantum dots to the iron oxide quantum dots is 9: 1; the average particle size of the copper oxide quantum dots and the iron oxide quantum dots is 2.1 nm.

The preparation method of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets comprises the following steps:

s1, adding urea into a crucible with a cover, placing the crucible in a muffle furnace, heating the crucible to 550 ℃ at the speed of 2.5 ℃/min, and keeping the temperature for 4 hours as a first stage; then cooling the obtained crude product, opening a crucible cover, heating the crude product to 500 ℃ in a muffle furnace at the speed of 5 ℃/min, keeping the temperature for 2h as the second stage heating, and calcining the obtained product to obtain carbon nitride nanosheets;

s2.900 mg of carbon nitride nanosheets are placed in a 250mL beaker, 90mL of absolute ethyl alcohol is added, and ultrasonic dispersion is carried out for 90min to uniformly disperse the carbon nitride nanosheets so as to obtain a suspension;

s3, adding 1mmol CuCl in total into the suspension₂·2H₂O and FeCl₃·6H₂O(CuCl₂·2H₂O and FeCl₃·6H₂Molar ratio of O9: 1), then 3mmol of NH were added₄HCO₃Continuously stirring for 8 hours at room temperature to obtain a mixed solution;

s4, centrifugally separating the mixed solution, washing the mixed solution for a plurality of times by using distilled water and absolute ethyl alcohol, and putting the collected solid catalyst into a 40 ℃ oven for vacuum drying overnight. And finally, heating the prepared precursor to 350 ℃ in a muffle furnace at the speed of 5 ℃/min, and annealing for 2h to obtain the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets.

Test example

Test example 1

The composite of the bimetallic oxide quantum dots and carbon nitride nanosheets of example 1 was used as a catalyst for testing the degradation activity of Tetracycline (TC) in photo-fenton catalysis. The specific test method is as follows:

weighing 20mg of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets, placing the composite material in a jacket beaker, adding a TC aqueous solution (40mL,50mg/L), ultrasonically dispersing for 10min, and stirring for 60min in the dark by introducing condensed water to realize adsorption-desorption balance between the catalyst and the TC pollutants. The xenon lamp (300W, lambda. gtoreq.420 nm) was turned on and 100mM H was added immediately₂O₂. During the reaction, 2.5ml of the suspension were taken at given time intervals and immediately filtered to remove the catalyst, and the supernatant was measured at 357nm with a UV-visible spectrophotometer and analyzed for the residual concentration of TC.

And setting a comparison experiment.

Comparative experiment 1:

in the TC aqueous solution, the illumination is continuously carried out without adding any composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets as a catalyst.

Comparative experiment 2:

to the aqueous TC solution was added 100mM H equivalent to that in test example 1₂O₂And continuously performing illumination under the condition of not adding any composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets as a catalyst.

As shown in fig. 4, in comparative experiment 1, the degradation efficiency of TC after 60min of illumination was 12.81%; in comparative experiment 2, TC was added with H₂O₂After the light irradiation is carried out for 60min, the degradation efficiency is 18.58 percent; in example 1, TC is added with H₂O₂And the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets is used as a catalyst, and after the catalyst is illuminated for 60min, the degradation efficiency reaches 99.78%, and the photo-Fenton catalytic effect is obviously improved.

Comparative experiment 3:

to the aqueous TC solution was added 100mM H equivalent to that in test example 1₂O₂The composite material of the iron oxide quantum dots and the carbon nitride nanosheets is used as a catalyst and is irradiated for 60 min.

As shown in fig. 5 (a), in comparative experiment 3, after stirring in the dark for 60min, the adsorption of TC by the composite material of the iron oxide quantum dots and the carbon nitride nanosheets was only 14.25%; in example 1, after stirring in the dark for 60min, the adsorption of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets to TC is 39.97%, which indicates that the copper oxide quantum dots and the iron oxide quantum dots have a synergistic effect and have a certain promotion effect on the adsorption of TC, so that the capacity of the composite material for degrading TC can be further improved. In comparative experiment 3, H was added under light₂O₂After the reaction is carried out for 60min, the degradation rate of the composite material of the iron oxide quantum dots and the carbon nitride nanosheets is slower than that of the composite material of the bimetallic oxide quantum dots and the carbon nitride nanosheets which is used as a catalyst.

As shown in FIG. 5 (b), the degradation rate constant k of the composite of the bimetallic oxide quantum dots and the carbon nitride nanosheets is-3.38 × 10^-2min^-1Compared with the composite material of iron oxide quantum dots and carbon nitride nanosheets (k ═ 3.64X 10)^-2min^-1) The reaction rate of (3) is more excellent.

The above test examples fully reflect the advancement of the application of the composite material of the bimetallic oxide quantum dot and the carbon nitride nanosheet in the field of photo-Fenton catalysis.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.