An in-situ photoinduced Janus Ni-site catalyst, its preparation method and application
By constructing atomically dispersed Janus structure nickel active center catalyst on the surface of BiOBr, the problem of low accuracy of Janus structure catalyst is solved, efficient photocatalytic CO2 reduction and tetracycline oxidation are achieved, and applied to photocatalytic energy conversion and environmental purification.
Patent Information
- Application Number
- CN202411940851.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2044-12-26
AI Technical Summary
The prior art is difficult to accurately construct high-quality Janus structural metal center catalyst, resulting in uneven distribution of active components and low catalytic activity.
In situ light induction method was used to construct a new atomically dispersed Janus structure nickel active center catalyst on BiOBr rich in amino and hydroxyl groups on the surface. Through the dual anchor positioning point and single metal atom strategy, NH2-Ni and OH-Ni bistructure Ni sites were formed, which were involved in CO2 reduction and TC oxidation, respectively.
The uniform distribution of active components of the catalyst and high catalytic activity are achieved, which avoids the problem of low accuracy in traditional methods, and demonstrates significant photocatalytic CO2 reduction coupled tetracycline oxidation activity, which is suitable for photocatalytic energy conversion and environmental purification.
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Figure CN119733548B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of inorganic nanomaterials, and in particular to an in-situ light-induced Janus Ni site catalyst and a preparation method and application thereof. Background Art
[0002] Recently, Janus (two-sided) composite materials have been widely used in optical imaging, emulsion stabilizers, catalysis and drug delivery. The coupling interface of Janus structure can provide an effective strategy for the design of photoelectric catalysts, overcoming the problems of uneven distribution of active components, poor effective contact and low catalytic activity of traditional bimetallic active site catalysts. However, most of the current research is to construct Janus structure metal center catalysts based on traditional synthesis strategies, fix anchoring points, and change the types of metal atoms to construct Janus structure active site catalysts. Due to the random dispersion of the two metal atoms on the substrate, it often causes the aggregation of metal atoms, resulting in a large number of homonuclear diatomic, single atom and even multi-metal atomic configurations in the synthesized catalyst. There is still room for breakthroughs in the research on the precise synthesis of Janus metal active sites. Therefore, the precise construction of high-quality Janus structure metal center catalysts is still a very challenging research topic.
[0003] Different from the traditional synthesis strategy of Janus active sites, the present invention starts from the anchoring site and the anchoring metal atom in reverse, replaces the "traditional single anchoring site" with the "double anchoring site", and replaces the "traditional double metal atom" with the "single metal atom", to construct a new atomically dispersed Janus structure nickel active center catalyst on BiOBr with rich amino and hydroxyl groups on the surface. The Janus active center catalyst constructed by this strategy can not only retain the advantages of the Janus structure, but also effectively avoid the disadvantages of the above-mentioned construction of the Janus structure active site catalyst. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide an in-situ light-induced Janus Ni site catalyst and a preparation method and application thereof, which can not only retain the advantages of the Janus structure, but also effectively avoid the problem of low precision of constructing Janus structure active site catalysts by traditional methods.
[0005] The present invention adopts the following technical solutions to solve the above technical problems:
[0006] A method for preparing an in-situ light-induced Janus Ni site catalyst comprises the following steps:
[0007] (1) Preparation of hydroxylated BiOBr
[0008] Dissolve Bi(NO3)3·5H2O in ethylene glycol solution and stir until clear; then, add KBr and continuously stir for 2 - 4 h; next, perform hydrothermal treatment at 115 - 125 °C for 8 - 12 h, wash and dry to obtain hydroxylated BiOBr, labeled as BOB-OH;
[0009] (2) Amino functionalization treatment
[0010] Disperse the BOB-OH powder obtained in step (1) in dilute ammonia water and stir evenly; after irradiating with a xenon lamp for 1 - 3 h, wash with deionized water; then, dry at 45 - 55 °C for 10 - 14 h to obtain NH2-BOB-OH;
[0011] (3) Preparation of Ni@NH2-BOB-OH
[0012] Disperse the NH2-BOB-OH powder obtained in step (2) in water and ultrasonically treat for 3 - 7 min; then, add an aqueous solution of NiCl2·6H2O and ultrasonically treat the resulting suspension for 8 - 12 min; after the ultrasonic treatment ends, start stirring and perform a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; finally, wash several times with deionized water, centrifuge, and collect the obtained powder for vacuum drying to obtain Ni@NH2-BOB-OH, which is the in-situ photoinduced Janus Ni-site catalyst required for the target.
[0013] As one of the preferred embodiments of the present invention, in step (1), specifically weigh 0.97 g of Bi(NO3)3·5H2O and dissolve it in 60 mL of ethylene glycol solution, and then add 0.238 g of KBr.
[0014] As one of the preferred embodiments of the present invention, in step (2), specifically weigh 0.5 g of BOB-OH powder and disperse it in 20 mL of dilute ammonia water.
[0015] As one of the preferred embodiments of the present invention, in step (2), the method for obtaining dilute ammonia water is: dilute 500 μL of 25% concentrated ammonia water to 20 mL with ultrapure water.
[0016] As one of the preferred embodiments of the present invention, in step (3), specifically weigh 200 mg of NH2-BOB-OH and disperse it in 80 mL of water. After ultrasonic treatment, add an aqueous solution of x mg of NiCl2·6H2O; where x takes 20, 40, 60, 80, or 100 mg to obtain Ni@NH2-BOB-OH with different ratios.
[0017] As one of the preferred embodiments of the present invention, in step (3), during the photodeposition reaction, maintain the solution temperature at 30 °C through a circulating water system.
[0018] As one of the preferred embodiments of the present invention, in the step (3), the vacuum drying temperature is 70 °C.
[0019] An in-situ photoinduced Janus Ni-site catalyst is prepared by the above method.
[0020] An application of the above in-situ photoinduced Janus Ni-site catalyst in photocatalytic energy conversion and collaborative environmental purification.
[0021] As one of the preferred embodiments of the present invention, the catalyst is used for photocatalytic CO2 reduction coupled with tetracycline (TC) oxidation.
[0022] Design idea and principle:
[0023] In traditional synthesis techniques of Janus active sites, mainly "dual metal atoms" are anchored on a "single active group" of a metal-free support. The random dispersion of the two metal atoms on the substrate causes aggregation of the metal atoms, resulting in the possible existence of a large number of homonuclear diatoms, single atoms, and even multi-metal atom configurations in the synthesized catalyst.
[0024] However, the present invention uses the abundant amino groups and hydroxyl groups on NH2-BOB-OH (metal-containing support) to anchor Ni atoms, respectively forming "NH2-Ni" and "OH-Ni" dual-structured Ni sites (Janus Ni sites). The formed dual-structured Ni sites are respectively involved in CO2 reduction coupled with TC oxidation; among them, NH2-Ni serves as a reduction site to reduce CO2, and the OH-Ni site serves as an oxidation site to oxidize TC.
[0025] The advantages of the present invention compared with the prior art are as follows:
[0026] (1) The present invention constructs a novel atomically dispersed Janus-structured nickel active center catalyst on BiOBr rich in amino and hydroxyl groups on the surface. The obtained catalyst can not only retain the advantages of the Janus structure (uniform distribution of active components, good effective contact, and high catalytic activity), but also effectively avoid the problem of low precision in traditional catalysts for constructing Janus-structured active sites;
[0027] (2) The present invention proposes a simple, green, and in-situ photoreduction method to achieve the anchoring of atomically dispersed single atoms on a BiOBr substrate material rich in active groups on the surface, and exhibits significant photocatalytic CO2 reduction coupled with tetracycline (TC) oxidation activity, which can be applied to the field of photocatalytic energy conversion and collaborative environmental purification;
[0028] (3) The preparation process of the catalyst of the present invention has mild conditions, does not require special equipment, is simple to operate, and the solvents used are all non-toxic and harmless. Brief Description of the Drawings
[0029] Figure 1 is the electron microscope structure diagram of the catalyst of the present invention (in the figure, Figure A is the electron microscope image of NH2-BOB-OH before Ni deposition, and Figure B is the electron microscope image of 0.2Ni@NH2-BOB-OH after Ni deposition);
[0030] Figure 2 is the photocatalytic CO2 reduction coupled TC oxidation activity results of a series of catalysts of the present invention;
[0031] Figure 3 is the photocatalytic CO2 reduction coupled TC oxidation activity results of catalysts based on different substrate materials;
[0032] Figure 4 is the catalytic activity results of the catalyst of the present invention in different reaction systems. Detailed Description of the Preferred Embodiments
[0033] The following is a detailed description of the embodiments of the present invention. The embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. At the same time, the reagent products and experimental methods used in the following embodiments, unless otherwise specified, are all conventional reagents or methods in the art and will not be described in detail.
[0034] Example 1
[0035] A preparation method of a catalyst "0.1Ni@NH2-BOB-OH" in this example includes the following steps:
[0036] (1) Preparation of hydroxylated BiOBr
[0037] Weigh 0.97 g of Bi(NO3)3·5H2O and dissolve it in 60 mL of ethylene glycol solution, and stir until it is clear; then, add 0.238 g of KBr and continuously stir for 3 h; then, perform hydrothermal treatment at 120 °C for 10 h, wash and dry to obtain hydroxylated BiOBr, labeled as BOB-OH.
[0038] (2) Amino functionalization treatment
[0039] Disperse 0.5 g of BOB-OH powder in 20 mL of dilute ammonia water (dilute 500 μL of 25% concentrated ammonia water to 20 mL with ultrapure water), and stir evenly; after irradiating with a xenon lamp for 2 h, wash with deionized water; then, dry at 50 °C for 12 h to obtain NH2-BOB-OH (amino-functionalized BOB-OH).
[0040] (3) Preparation of 0.1Ni@NH2-BOB-OH
[0041] Disperse 200 mg of NH2-BOB-OH powder in 80 mL of water and ultrasonically treat for 5 min; subsequently, add 20 mg of an aqueous solution of NiCl2·6H2O, and ultrasonically treat the resulting suspension for 10 min; after the ultrasonic treatment ends, start stirring, and carry out a photo-deposition reaction under the full arc irradiation of a 300 W xenon lamp; during the reaction process, maintain the solution temperature at 30 °C through a circulating water system; finally, wash several times with deionized water, and after centrifugation, collect the obtained powder and vacuum dry it at 70 °C to obtain 0.1Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.1:1), which is the in-situ photo-induced Janus Ni-site catalyst required for the target.
[0042] Example 2
[0043] A preparation method of a catalyst "0.1Ni@NH2-BOB-OH" in this example includes the following steps:
[0044] (1) Preparation of hydroxylated BiOBr
[0045] Weigh 0.97 g of Bi(NO3)3·5H2O, dissolve it in 60 mL of ethylene glycol solution, and stir until clear; subsequently, add 0.238 g of KBr and continuously stir for 2 h; then, carry out hydrothermal treatment at 115 °C for 12 h, wash and dry to obtain hydroxylated BiOBr, labeled as BOB-OH.
[0046] (2) Amino-functionalization treatment
[0047] Disperse 0.5 g of BOB-OH powder in 20 mL of dilute ammonia water (dilute 500 μL of 25% concentrated ammonia water to 20 mL with ultrapure water), stir evenly; after irradiating with a xenon lamp for 1 h, wash with deionized water; then, dry at 45 °C for 14 h to obtain NH2-BOB-OH (amino-functionalized BOB-OH).
[0048] (3) Preparation of 0.1Ni@NH2-BOB-OH
[0049] Disperse 200 mg of NH2-BOB-OH powder in 80 mL of water and ultrasonically treat for 3 min; subsequently, add 20 mg of an aqueous solution of NiCl2·6H2O and ultrasonically treat the resulting suspension for 8 min; after the ultrasonic treatment ends, start stirring and carry out a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; during the reaction process, maintain the solution temperature at 30 °C through a circulating water system; finally, wash several times with deionized water, centrifuge, and collect the resulting powder, which is vacuum dried at 70 °C to obtain 0.1Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.1:1), namely the in-situ photoinduced Janus Ni site catalyst required for the target.
[0050] Example 3
[0051] A preparation method of a catalyst "0.1Ni@NH2-BOB-OH" in this example includes the following steps:
[0052] (1) Preparation of hydroxylated BiOBr
[0053] Weigh 0.97 g of Bi(NO3)3·5H2O, dissolve it in 60 mL of ethylene glycol solution, and stir until clear; subsequently, add 0.238 g of KBr and continuously stir for 4 h; then, perform hydrothermal treatment at 125 °C for 8 h, wash and dry to obtain hydroxylated BiOBr, labeled as BOB-OH.
[0054] (2) Amino functionalization treatment
[0055] Disperse 0.5 g of BOB-OH powder in 20 mL of dilute ammonia water (dilute 500 μL of 25% concentrated ammonia water to 20 mL with ultrapure water), stir evenly; after irradiating with a xenon lamp for 3 h, wash with deionized water; then, dry at 55 °C for 10 h to obtain NH2-BOB-OH (amino-functionalized BOB-OH).
[0056] (3) Preparation of 0.1Ni@NH2-BOB-OH
[0057] Disperse 200 mg of NH2-BOB-OH powder in 80 mL of water and ultrasonically treat for 7 min; subsequently, add an aqueous solution of 20 mg of NiCl2·6H2O and ultrasonically treat the resulting suspension for 12 min; after the ultrasonication ends, start stirring and carry out a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; during the reaction, maintain the solution temperature at 30 °C through a circulating water system; finally, wash several times with deionized water, centrifuge, and collect the resulting powder and vacuum dry it at 70 °C to obtain 0.1Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.1:1), which is the in-situ photoinduced Janus Ni-site catalyst required for the target.
[0058] Example 4
[0059] The preparation method of a catalyst "0.2Ni@NH2-BOB-OH" in this example is basically the same as that in Example 1, and the main difference is that in step (3), disperse 200 mg of NH2-BOB-OH powder in 80 mL of water and ultrasonically treat for 5 min; subsequently, add an aqueous solution of 40 mg of NiCl2·6H2O and ultrasonically treat the resulting suspension for 10 min; after the ultrasonication ends, start stirring and carry out a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; during the reaction, maintain the solution temperature at 30 °C through a circulating water system; finally, wash several times with deionized water, centrifuge, and collect the resulting powder and vacuum dry it at 70 °C to obtain 0.2Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.2:1), which is the in-situ photoinduced Janus Ni-site catalyst required for the target.
[0060] Example 5
[0061] The preparation method of a catalyst "0.3Ni@NH2-BOB-OH" in this example is basically the same as that in Example 1, and the main difference is that in step (3), disperse 200 mg of NH2-BOB-OH powder in 80 mL of water and ultrasonically treat for 5 min; subsequently, add an aqueous solution of 60 mg of NiCl2·6H2O and ultrasonically treat the resulting suspension for 10 min; after the ultrasonication ends, start stirring and carry out a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; during the reaction, maintain the solution temperature at 30 °C through a circulating water system; finally, wash several times with deionized water, centrifuge, and collect the resulting powder and vacuum dry it at 70 °C to obtain 0.3Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.3:1), which is the in-situ photoinduced Janus Ni-site catalyst required for the target.
[0062] Example 6
[0063] The preparation method of a catalyst "0.4Ni@NH2-BOB-OH" in this example is basically the same as that in Example 1. The main difference is that in step (3), 200 mg of NH2-BOB-OH powder is dispersed in 80 mL of water and ultrasonically treated for 5 min; subsequently, an aqueous solution of 80 mg of NiCl2·6H2O is added, and the resulting suspension is ultrasonically treated for 10 min; after the ultrasonic treatment ends, stirring is started, and a photoreduction reaction is carried out under the full arc irradiation of a 300 W xenon lamp; during the reaction process, the solution temperature is maintained at 30 °C through a circulating water system; finally, it is washed several times with deionized water, centrifuged, and the obtained powder is collected and vacuum dried at 70 °C to obtain 0.4Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.4:1), that is, the in-situ photoinduced Janus Ni-site catalyst required by the target.
[0064] Example 7
[0065] The preparation method of a catalyst "0.5Ni@NH2-BOB-OH" in this example is basically the same as that in Example 1. The main difference is that in step (3), 200 mg of NH2-BOB-OH powder is dispersed in 80 mL of water and ultrasonically treated for 5 min; subsequently, an aqueous solution of 100 mg of NiCl2·6H2O is added, and the resulting suspension is ultrasonically treated for 10 min; after the ultrasonic treatment ends, stirring is started, and a photoreduction reaction is carried out under the full arc irradiation of a 300 W xenon lamp; during the reaction process, the solution temperature is maintained at 30 °C through a circulating water system; finally, it is washed several times with deionized water, centrifuged, and the obtained powder is collected and vacuum dried at 70 °C to obtain 0.5Ni@NH2-BOB-OH (mass ratio of NiCl2·6H2O:NH2-BOB-OH = 0.5:1), that is, the in-situ photoinduced Janus Ni-site catalyst required by the target.
[0066] Experimental Example 1
[0067] This experimental example is used to analyze the structural characteristics of the in-situ photoinduced Janus Ni-site catalyst of the present invention.
[0068] Taking the catalyst 0.2Ni@NH2-BOB-OH prepared in Example 4 as an example, observe its microstructure before and after Ni deposition.
[0069] Figure 1 It is the electron microscope structure diagram of the catalyst of the present invention. In the figure, Figure A is the electron microscope image of NH2-BOB-OH before Ni deposition, and Figure B is the electron microscope image of 0.2Ni@NH2-BOB-OH after Ni deposition. Figure 1It can be seen that NH2-BOB-OH is a spherical structure composed of nanosheets. After the deposition of Ni atoms, the nanospherical structure of NH2-BOB-OH is still retained. Accordingly, the catalyst of the present invention retains the advantages of the Janus structure.
[0070] Experimental Example 2
[0071] This experimental example is used to verify the photocatalytic CO2 reduction coupled with TC oxidation activity of the catalyst of the present invention.
[0072] A series of in-situ photoinduced Janus Ni-site catalysts prepared by the present invention are respectively used in the coupled reaction system of photocatalytic CO2 reduction coupled with TC oxidation decomposition. The specific process is as follows:
[0073] After adding 50 mg of the photocatalyst 0.1Ni@NH2-BOB-OH (Example 1), 0.2Ni@NH2-BOB-OH (Example 4), 0.3Ni@NH2-BOB-OH (Example 5), 0.4Ni@NH2-BOB-OH (Example 6) or 0.5Ni@NH2-BOB-OH (Example 7) to the photocatalytic reactor, 50 mL of TC aqueous solution (20 mg / L) is added and dispersed evenly by ultrasonic for 5 min. Then, the reactor is installed on the reaction system, and the whole system is evacuated. Then, 50 mL of CO2 (purity 99.999%) reaction gas is introduced into the system. Finally, a gas chromatograph is used to measure the gas products of the photocatalytic reaction, and an ultraviolet-visible spectrophotometer is used to measure the absorbance of the TC supernatant after the catalytic reaction.
[0074] Figure 2 are the photocatalytic CO2 reduction coupled with TC oxidation activity results of a series of catalysts of the present invention (using BOB-OH and NH2-BOB-OH as controls). Figure 2 It can be seen that the photocatalytic performance of NH2-BOB-OH is significantly superior to that of BOB-OH; once Ni atoms are deposited, the Ni@NH2-BOB-OH is significantly improved, and with the increase of the Ni atom deposition amount, the photocatalytic CO2 reduction coupled with TC oxidation activity of Ni@NH2-BOB-OH increases accordingly until it increases to 0.2 wt%, and the photocatalytic redox performance reaches the maximum value. However, with the further increase of the Ni atom deposition amount, the photocatalytic redox performance of Ni@NH2-BOB-OH gradually decreases.
[0075] Experimental Example 3
[0076] This experimental example is used to verify the influence of different substrate materials on the photocatalytic activity of the catalyst of the present invention.
[0077] Referring to the method of Example 4, catalysts 0.2Ni@NH2-BOB-OH, 0.2Ni@BOB, 0.2Ni@BOB-OH, and 0.2Ni@NH2-BOB were prepared respectively, and their corresponding photocatalytic CO2 reduction coupled with TC oxidation activities were measured (the measurement method is the same as that in Experimental Example 2).
[0078] The results are as Figure 3 shown. It can be Figure 3 seen that 0.2Ni@NH2-BOB-OH exhibits excellent photocatalytic redox performance compared with 0.2Ni@BOB, 0.2Ni@BOB-OH, and 0.2Ni@NH2-BOB. This is mainly attributed to the fact that the Ni dual-atom sites with Janus structure anchored by dual active groups are the main factors for improving photocatalytic redox performance.
[0079] Experimental Example 4
[0080] This experimental example is used to verify the influence of different reaction systems on the catalytic activity of the catalyst of the present invention.
[0081] Referring to the method of Example 2, different reaction systems were constructed respectively (single TC oxidation system, coupled reaction system of CO2 reduction coupled with TC oxidation, single CO2 reduction system), and the 0.2Ni@NH2-BOB-OH catalyst was used for activity detection in the above systems respectively. Among them, the coupled reaction system is the coupled reaction system of photocatalytic CO2 reduction coupled with TC oxidation corresponding to Experimental Example 2; no CO2 is added to the single TC oxidation system; no aqueous TC solution is added to the single CO2 reduction system.
[0082] The detection results are as Figure 4 shown. It can be Figure 4 seen that the 0.2Ni@NH2-BOB-OH photocatalyst exhibits the best photocatalytic redox performance in the "coupled reaction system of photocatalytic CO2 reduction coupled with TC oxidation", which is significantly superior to other "single reaction systems", further confirming that the coupled reaction system realizes the full utilization of carriers, thus presenting significant photocatalytic oxidation performance. It can be seen that the Janus Ni-site catalyst material prepared by the present invention has potential application prospects in synergistically alleviating the energy crisis and treating industrial wastewater.
[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. A preparation method of an in-situ photoinduced Janus Ni-site catalyst, characterized in that, It includes the following steps: (1) Preparation of hydroxylated BiOBr Dissolve Bi(NO3)3·5H2O in ethylene glycol solution and stir until clear; then, add KBr and continuously stir for 2 - 4 h; next, perform hydrothermal treatment at 115 - 125 °C for 8 - 12 h, wash and dry to obtain hydroxylated BiOBr, labeled as BOB-OH; (2) Amino functionalization treatment Disperse the BOB-OH powder obtained in step (1) in dilute ammonia water and stir evenly; after irradiating with a xenon lamp for 1 - 3 h, wash with deionized water; then, dry at 45 - 55 °C for 10 - 14 h to obtain amino-functionalized BOB-OH, namely NH2-BOB-OH; (3) Preparation of Ni@NH2-BOB-OH Disperse the NH2-BOB-OH powder obtained in step (2) in water and ultrasonically treat for 3 - 7 min; then, add an aqueous solution of NiCl2·6H2O and ultrasonically treat the resulting suspension for 8 - 12 min; after the ultrasonic treatment ends, start stirring and perform a photodeposition reaction under the full arc irradiation of a 300 W xenon lamp; finally, wash several times with deionized water, centrifuge, and collect the obtained powder for vacuum drying to obtain Ni@NH2-BOB-OH, which is the in-situ photoinduced Janus Ni-site catalyst required for the target.
2. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, wherein, In step (1), specifically weigh 0.97 g of Bi(NO3)3·5H2O and dissolve it in 60 mL of ethylene glycol solution, and then add 0.238 g of KBr.
3. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, characterized in that, In step (2), specifically weigh 0.5 g of BOB-OH powder and disperse it in 20 mL of dilute ammonia water.
4. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, wherein In step (2), the method for obtaining dilute ammonia water is: dilute 500 μL of 25% concentrated ammonia water to 20 mL with ultrapure water.
5. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, wherein In step (3), specifically weigh 200 mg of NH2-BOB-OH and disperse it in 80 mL of water. After ultrasonic treatment, add an aqueous solution of x mg of NiCl2·6H2O; where x takes 20, 40, 60, 80, or 100 mg to obtain Ni@NH2-BOB-OH with different ratios.
6. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, wherein, In step (3), during the photodeposition reaction, keep the solution temperature at 30 °C through a circulating water system.
7. The preparation method of the in-situ photoinduced Janus Ni-site catalyst according to claim 1, characterized in that, In step (3), the vacuum drying temperature is 70 °C.
8. An in-situ photoinduced Janus Ni-site catalyst, characterized in that, It is prepared by the method described in any one of claims 1 - 7.
9. Application of an in-situ photoinduced Janus Ni-site catalyst as described in claim 8 in photocatalytic energy conversion and synergistic environmental purification.
10. The application according to claim 9, characterized in that, Use the catalyst for photocatalytic CO2 reduction coupled with tetracycline TC oxidation; the NH2-Ni and OH-Ni dual-structured Ni sites in the catalyst respectively participate in CO2 reduction coupled with TC oxidation; and among them, NH2-Ni serves as a reduction site to reduce CO2, and the OH-Ni site serves as an oxidation site to oxidize TC.