CN114515591A - B, N codoped TiO2Preparation method of nanosheet photocatalyst - Google Patents

B, N codoped TiO2Preparation method of nanosheet photocatalyst Download PDF

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CN114515591A
CN114515591A CN202210244662.8A CN202210244662A CN114515591A CN 114515591 A CN114515591 A CN 114515591A CN 202210244662 A CN202210244662 A CN 202210244662A CN 114515591 A CN114515591 A CN 114515591A
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China
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tio
nanosheet
photocatalyst
catalyst
codoped
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Chinese (zh)
Inventor
王红菊
陈西孟
马中军
朱桂芬
武大鹏
蒋凯
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Henan Normal University
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Henan Normal University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24Nitrogen compounds
    • B01J35/39
    • B01J35/40
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027Powdering
    • B01J37/0036Grinding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/04Mixing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08Heat treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08Heat treatment
    • B01J37/10Heat treatment in the presence of water, e.g. steam
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2/00Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10LFUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/08Production of synthetic natural gas
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/36Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Abstract

The invention discloses a B, N codoped TiO2The preparation method of the nanosheet photocatalyst comprises the steps of uniformly mixing tetrabutyl titanate and hydrofluoric acid, transferring the mixture into a reaction kettle, and carrying out hydrothermal reaction at 180 ℃ to prepare TiO2Nanosheet, centrifugal washingDrying for later use after washing; adding TiO into the mixture2Mixing the nano-sheets and ammonia borane, ball-milling, putting the mixture into a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 1-3 ℃/min under protection, carrying out heat treatment for 3-6h, and cooling to room temperature to obtain the B, N co-doped TiO2A nanosheet photocatalyst. B, N codoped TiO prepared by the invention2Nano-sheet photocatalyst for photocatalytic reduction of CO2Not only broadens the photoresponse range of the catalyst, but also increases CO2The amount of gas adsorbed on the catalyst surface.

Description

B, N codoped TiO2Preparation method of nanosheet photocatalyst
Technical Field
The invention belongs to the technical field of preparation of photocatalytic materials, and particularly relates to a B and N co-doped TiO2A preparation method of a nanosheet photocatalyst.
Background
The carbon dioxide is converted into useful renewable fuel, so that the global warming can be relieved, the energy crisis is solved, and the strategic goals of carbon peak reaching and carbon neutralization are realized early. However, carbon dioxide is highly stable, chemically inert, and not readily adsorbed on the catalyst, making its activation and conversion very challenging. The conversion methods commonly used at present include electrochemical conversion, biological conversion, photocatalytic conversion and the like. Wherein the photocatalytic conversion is used for simulating photosynthesis in nature and using solar energy to convert CO under mild conditions 2Conversion to CO, CH4Useful small molecule fuels such as CHOOH. Since a catalyst plays an important role in photocatalysis, it is a problem that researchers have made efforts to find a catalyst having high catalytic activity and high selectivity.
TiO2It is often used as a photocatalyst because of its advantages of stable physicochemical properties, non-toxicity, and low cost. However, TiO2The wide band gap (-3.2 eV) can only absorb the ultraviolet part (-5%) in sunlight, and the application of the solar cell in practice is limited to a great extent. In order to overcome the defects, the invention introduces the capture trap of electrons while doping the foreign atoms through one-step reaction, and uses the catalyst for photocatalytic reduction of CO2The doped B element improves the CO surface to the material2The adsorption capacity of the molecule can provide abundant raw materials in the catalysis process; the introduction of the anisotropic element B, N can widen the response range of the catalyst to incident light, and the generated trapping trap can temporarily store electrons and accelerate photo-generated chargesAnd separating, so that the material shows better charge separation efficiency. Based on the above analysis, the catalyst is used for photocatalytic reduction of CO2Has better catalytic activity. In the related reports at present, B, N codoped TiO is rare 2For photocatalytic reduction of CO2The field of application.
Disclosure of Invention
The invention solves the technical problem of providing a catalyst which has simple process and low cost and can efficiently catalyze and reduce CO2B, N codoped TiO of (1)2A preparation method of a nanosheet photocatalyst.
The invention adopts the following technical scheme to solve the technical problems that B and N are codoped with TiO2The preparation method of the nanosheet photocatalyst is characterized by comprising the following specific steps of: tetrabutyl titanate and hydrofluoric acid are evenly mixed and then transferred into a reaction kettle for hydrothermal reaction at 180 ℃ to prepare TiO2Centrifugally washing the nanosheets, and drying for later use; adding TiO into the mixture2Mixing the nano-sheets and ammonia borane, ball-milling, putting the mixture into a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 1-3 ℃/min under protection, carrying out heat treatment for 3-6h, and cooling to room temperature to obtain the B, N co-doped TiO2Nanosheet photocatalyst, the B, N codoped TiO2The nano-sheet photocatalyst improves CO due to the doped B element2The adsorption amount of molecules on the surface of the catalyst provides rich raw materials for catalytic reaction, the introduction of B, N element widens the photoresponse range of the catalyst, the utilization rate of incident light is improved, a capture trap generated by the defects on the surface of the catalyst can temporarily store electrons, and the separation of photo-generated charges is accelerated, so that the catalyst shows better charge separation efficiency, and further the B and N co-doped TiO is enabled to be 2The nano-sheet photocatalyst can be used for efficiently catalyzing and reducing CO2
Further defined, the TiO2The feeding mass ratio of the nanosheet to the ammonia borane is 2: 0.0342-0.684.
Further limiting, the ball milling time of the ball milling process is 4-8 h.
Compared with the prior art, the invention has the following advantages and beneficial effects: prepared by the inventionB, N codoped TiO2Nano-sheet photocatalyst for photocatalytic reduction of CO2Not only broadens the photoresponse range of the catalyst, but also increases CO2The amount of gas adsorbed on the catalyst surface; in the catalysis process, the defect characteristic of the catalyst can be used as trap hydrazine to temporarily store electrons, and the separation of photo-generated charges is accelerated, so that the recombination efficiency of the photo-generated electrons is reduced, and the prepared B and N co-doped TiO is further enabled to be2Photocatalytic reduction of CO with nanosheet photocatalyst2The performance is obviously improved.
Drawings
FIG. 1 shows the B, N codoped TiO prepared in example 1 of the present invention2SEM image of nanoplatelet photocatalyst;
FIG. 2 shows pure TiO prepared according to example 1 of the present invention2SEM images of the nanoplatelets;
FIG. 3 shows the B, N codoped TiO prepared in example 2 of the present invention2Nanosheet photocatalyst and pure TiO2XPS plot of nanoplates;
FIG. 4 shows the B, N codoped TiO prepared in example 2 of the present invention 2Nanosheet photocatalyst and pure TiO2Photocatalytic reduction of CO from nanosheets2Performance map of (2).
Detailed Description
The present invention is described in further detail below with reference to examples, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples, and that all the technologies realized based on the above subject matter of the present invention belong to the scope of the present invention.
Example 1
Uniformly mixing 25mL of tetrabutyl titanate and 3mL of hydrofluoric acid, transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 24 hours, and centrifugally washing the obtained product to obtain TiO2Centrifugally washing the nanosheets, and drying for later use; 2g of the TiO prepared above2Mixing the nano sheets with 0.0342g of ammonia borane, ball-milling for 4h, placing the mixture in a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 3 ℃/min under protection, carrying out heat treatment for 3h, and then cooling to room temperature to obtain the B, N co-doped TiO2A nanosheet photocatalyst. FIG. 1 shows the B, N-codoped TiO prepared in this example2SEM image of nanosheet photocatalyst, and pure TiO2Compared with the nano-sheet (figure 2), the sample after doping is changed into an irregular sheet structure from a rectangular structure, and the size of the nano-sheet is reduced, because the doping of B element limits TiO 2And (4) growing the nanosheet.
Example 2
Uniformly mixing 25mL of tetrabutyl titanate and 3mL of hydrofluoric acid, transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 24 hours, and centrifugally washing the obtained product to obtain TiO2Centrifugally washing the nanosheets, and drying for later use; 2g of the TiO prepared above2Mixing the nano sheets with 0.342g of ammonia borane, ball-milling for 6h, placing the mixture in a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 3 ℃/min under protection, carrying out heat treatment for 4h, and then cooling to room temperature to obtain the B, N co-doped TiO2A nanosheet photocatalyst. It can be seen from XPS spectrum (FIG. 3) that B element and N element are successfully doped into TiO2In the sample. The B, N-codoped TiO prepared in the example2Application of nanosheet photocatalyst to photocatalytic reduction of CO2As can be seen from fig. 4, the catalytic performance was significantly improved. This is because the incorporation of B increases CO2The adsorption capacity of molecules on the surface of the catalyst provides abundant raw materials for catalytic reaction. Meanwhile, the introduction of B, N element widens the photoresponse range of the catalyst and improves the utilization rate of incident light. In addition, the trap generated by the surface defects of the catalyst can temporarily store electrons, and the separation of photo-generated charges is accelerated, so that the catalyst shows better charge separation efficiency. Based on the advantages, the B and N codoped TiO prepared by the invention 2The nanoplatelet photocatalyst finally exhibits satisfactory catalytic activity.
Example 3
Uniformly mixing 25mL of tetrabutyl titanate and 3mL of hydrofluoric acid, transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 24 hours, and centrifugally washing the obtained product to obtain TiO2Centrifugally washing the nanosheets, and drying for later use; 2g of the TiO prepared above2Mixing the nano sheets with 0.684g of ammonia borane, ball-milling for 8 hours, placing the mixture in a tube furnace, and adding N2Heating to the temperature of 2 ℃/min under protectionHeat treatment is carried out for 6h at 500 ℃, and then the temperature is reduced to room temperature to prepare the B, N codoped TiO2A nanosheet catalyst.
Example 4
Uniformly mixing 25mL of tetrabutyl titanate and 3mL of hydrofluoric acid, transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 24 hours, and centrifugally washing the obtained product to obtain TiO2Centrifugally washing the nanosheets, and drying for later use; 2g of the TiO prepared above2Mixing the nano sheets with 0.684g of ammonia borane, ball-milling for 8 hours, placing the mixture in a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 1 ℃/min under protection, carrying out heat treatment for 6h, and then cooling to room temperature to obtain the B, N co-doped TiO2A nanosheet catalyst.
The foregoing embodiments illustrate the principles, principal features and advantages of the invention, and it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made therein without departing from the scope of the principles of the invention.

Claims (3)

1. B, N codoped TiO2The preparation method of the nanosheet photocatalyst is characterized by comprising the following specific steps of: mixing tetrabutyl titanate and hydrofluoric acid uniformly, transferring the mixture into a reaction kettle, and carrying out hydrothermal reaction at 180 ℃ to obtain TiO2Centrifugally washing the nanosheets, and drying the nanosheets for later use; mixing TiO with2Mixing the nano-sheets and ammonia borane, ball-milling, putting the mixture into a tube furnace, and adding N2Heating to 500 ℃ at a heating rate of 1-3 ℃/min under protection, carrying out heat treatment for 3-6h, and cooling to room temperature to obtain the B, N co-doped TiO2Nanosheet photocatalyst, the B, N codoped TiO2The nano-sheet photocatalyst improves CO due to the doped B element2The adsorption quantity of molecules on the surface of the catalyst provides rich raw materials for catalytic reaction, the introduction of B, N element widens the photoresponse range of the catalyst, improves the utilization rate of incident light, and the capture trap generated by the defects on the surface of the catalyst can temporarily store electrons to accelerate the separation of photo-generated chargesSo that the catalyst shows better charge separation efficiency, and further the B and N co-doped TiO2The nanosheet photocatalyst can be used for efficiently catalyzing and reducing CO2
2. The B, N-codoped TiO of claim 12The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: the TiO is 2The feeding mass ratio of the nanosheet to the ammonia borane is 2: 0.0342-0.684.
3. The B, N-codoped TiO of claim 12The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: the ball milling time in the ball milling process is 4-8 h.
CN202210244662.8A 2022-03-14 2022-03-14 B, N codoped TiO2Preparation method of nanosheet photocatalyst Pending CN114515591A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100213046A1 (en) * 2009-01-06 2010-08-26 The Penn State Research Foundation Titania nanotube arrays, methods of manufacture, and photocatalytic conversion of carbon dioxide using same
CN110586060A (en) * 2019-09-25 2019-12-20 江南大学 Composite photocatalyst with oxidation-reduction performance and preparation method thereof
CN113731503A (en) * 2021-09-08 2021-12-03 河南师范大学 Preparation method of metal phthalocyanine complex-titanium dioxide composite photocatalyst

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100213046A1 (en) * 2009-01-06 2010-08-26 The Penn State Research Foundation Titania nanotube arrays, methods of manufacture, and photocatalytic conversion of carbon dioxide using same
CN110586060A (en) * 2019-09-25 2019-12-20 江南大学 Composite photocatalyst with oxidation-reduction performance and preparation method thereof
CN113731503A (en) * 2021-09-08 2021-12-03 河南师范大学 Preparation method of metal phthalocyanine complex-titanium dioxide composite photocatalyst

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DAPENG WU等: "Green synthesis of boron and nitrogen co-doped TiO2 with rich B-N motifs as Lewis acid-base couples for the effective artificial CO2 photoreduction under simulated sunlight", JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol. 585, pages 97 *
MING-YANG XING等: "Formation of New Structures and Their Synergistic Effects in Boron and Nitrogen Codoped TiO 2 for Enhancement of Photocatalytic Performance", THE JOURNAL OF PHYSICAL CHEMISTRY, vol. 115, pages 7858 - 7865 *
YUEXIANG LI: "Boron and nitrogen co-doped titania with enhanced visible-light photocatalytic activity for hydrogen evolution", APPLIED SURFACE SCIENCE, vol. 254, pages 6831 - 6836, XP023977162, DOI: 10.1016/j.apsusc.2008.04.075 *

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