CN112657518A - Carbon dioxide reduction composite photocatalytic material and preparation method thereof - Google Patents

Carbon dioxide reduction composite photocatalytic material and preparation method thereof Download PDF

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CN112657518A
CN112657518A CN202110016894.3A CN202110016894A CN112657518A CN 112657518 A CN112657518 A CN 112657518A CN 202110016894 A CN202110016894 A CN 202110016894A CN 112657518 A CN112657518 A CN 112657518A
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photocatalytic material
carbon dioxide
preparation
composite photocatalytic
dioxide reduction
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孙松美
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Donghua University
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Donghua University
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Abstract

The invention discloses a carbon dioxide reduction composite photocatalytic material and a preparation method thereof. The chemical composition of the carbon dioxide reduction composite photocatalytic material is MoS2/SnS2‑x. The preparation method comprises the following steps: dissolving thiourea in water, and stirring to obtain a solution; adding molybdenum salt and tin salt into the solution and stirring to form a precursor solution; and transferring the precursor solution into a hydrothermal kettle, carrying out hydrothermal reaction at 100-300 ℃, washing, and drying to obtain the carbon dioxide reduction composite photocatalytic material. The interface defects of the photocatalytic material obtained by the method are greatly reduced, the interface conductivity is higher, and the photocatalytic material has smaller particle size and higher catalytic performance; the preparation method of the invention does not need toSpecial equipment and harsh conditions, simple process, strong controllability, easy realization of large-scale production and practicability.

Description

Carbon dioxide reduction composite photocatalytic material and preparation method thereof
Technical Field
The invention relates to a preparation method of a high-efficiency carbon dioxide reduction composite photocatalytic material, belonging to the technical field of photocatalytic materials.
Background
At present, the development of human society is severely restricted by the problem of environmental pollution caused by exhaustion and use of traditional fossil energy. The development and utilization of new energy sources become the focus of attention of people. Among a plurality of new energy technologies, photocatalytic solar fuel preparation can convert solar energy into hydrogen energy (photocatalytic water decomposition) and other chemical energy (photocatalytic carbon dioxide fixation) and is one of the technologies with the most application prospect. Although the photocatalytic technology is very attractive and has great potential for development in the field of solar energy conversion, large-scale application cannot be realized, and the core problems of the photocatalytic technology are that the utilization rate of solar energy by a catalyst is not high, a photon-generated carrier is easy to recombine, the adsorption and activation capacity of the catalyst on pollutants is low, and the like. Therefore, the search for new catalytic materials and catalytic technologies to solve the above problems and improve the solar energy conversion efficiency has become an important research subject in this direction.
CO2The key of the reduction reaction is CO2Adsorption and activation. Conventional CO2The reduction requires the activation of CO in a high-temperature and high-pressure environment2A molecule. If light energy is introduced into this reaction system, it is possible to effect this reaction at normal temperature and pressure. Photocatalytic CO2Reduction is achieved by reacting CO with a semiconductor photocatalyst in response to light2The conversion of C-H organic matters such as methane, methanol, ethanol and the like into light energy into chemical energy is a new technology, and has become an important scientific and technical problem in the field of photocatalysis due to energy conservation and environmental protection.
Photocatalytic CO2The core problem of reduction is the design, development and development of suitable photocatalysts. The current research is mainly focused on transition metal doped TiO2A base series photocatalyst. But in the case of TiO2There are several key technical difficulties, such as TiO2Has a band gap of 3.2eV, can be excited only by ultraviolet light (accounting for only 3.8% of solar energy), and further TiO2The recombination rate of photon-generated carriers is high, the quantum efficiency is low (less than 4 percent), the utilization rate of solar energy is low, and almost no photoresponse exists in the visible light range; for photocatalytic CO2When reducing, the methane yield is generally 0.1-10 mu mol/g without adding a cavity sacrificial agentcatalyst·h。
The research and development of a novel high-efficiency photocatalytic material for realizing photocatalytic CO by utilizing solar energy2The key to reduction is the inevitable trend and development direction for further practical application of photocatalysis. Solar CO improving photocatalytic material2Reduction efficiency, on the one hand, needs to reduce the band gap of the semiconductor catalytic material in order to utilize visible light and infrared light in solar energyExciting a photocatalytic material; on the other hand, the separation and transmission efficiency of the photon-generated carriers needs to be improved, and the effective carrier concentration transmitted to the surface of the material is increased, so that the photocatalytic performance is improved. Compared with oxide semiconductor photocatalytic materials, sulfides have narrower band gaps, and can absorb more visible light to participate in catalytic reaction. In MoS2For example, the semiconductor band gap is only about 1.8eV, and the semiconductor band gap can be excited by visible light and ultraviolet light with the wavelength of less than 688nm, so the semiconductor band gap is expected to be a high-activity visible light catalytic material. But MoS2The narrow band gap also causes valence band holes to recombine more easily with conduction band electrons, thereby rendering the excited electrons ineffective in participating in the photocatalytic reaction. In order to solve the problems, a method for preparing a composite photocatalytic material is generally adopted at present, so that a photo-generated electron and a photo-generated hole are respectively transferred to two mutually contacted semiconductors, the recombination probability of a current carrier on the same semiconductor is reduced, and the photocatalytic efficiency is increased. Semiconductor SnS2The band gap is about 2.4eV, and the catalyst is an ideal visible light semiconductor catalyst. There are reports that have confirmed MoS2And SnS2Composite prepared photocatalytic material performance ratio pure MoS2And SnS2High in activity, and is expected to become an applicable high-activity visible-light catalyst. But currently MoS2/SnS2The preparation of the composite material adopts a two-step method, and MoS is prepared firstly2Or SnS2And (3) dispersing the powder in a precursor solution of another component, and growing a second component on the original powder by heating or hydrothermal method. The composite material obtained by the step preparation method is difficult to realize in-situ growth at the interface of the composite material, so that the interface resistance is increased, the migration of electron holes between two catalysts is hindered, and an ideal semiconductor composite catalyst cannot be formed. Therefore, the invention discloses a one-step method in-situ growth technology for preparing two-phase composite MoS2/SnS2The photocatalytic material has high scientific value and practical significance for relieving energy crisis and preventing and treating environmental pollution.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to improve solar energy CO of photocatalysis material2And (4) reducing efficiency.
In order to solve the technical problem, the invention provides a carbon dioxide reduction composite photocatalytic material which is characterized in that the chemical composition of the carbon dioxide reduction composite photocatalytic material is MoS2/SnS2-x
Preferably, the carbon dioxide reduction composite photocatalytic material is obtained by in-situ growth from a precursor solution by a one-step hydrothermal method.
The invention also provides a preparation method of the carbon dioxide reduction composite photocatalytic material, which is characterized in that thiourea is dissolved in water and stirred into a solution; adding molybdenum salt and tin salt into the solution and stirring to form a precursor solution; and transferring the precursor solution into a hydrothermal kettle, carrying out hydrothermal reaction at 100-300 ℃, washing, and drying to obtain the carbon dioxide reduction composite photocatalytic material.
Preferably, the molybdenum salt is at least one of soluble molybdate, molybdenum chloride and molybdenum complex; the tin salt is at least one of tin sulfate, tin chloride and a tin complex.
More preferably, the soluble molybdate is at least one of sodium molybdate and potassium molybdate.
Preferably, the molar concentration of thiourea in the precursor solution is 0.01-10 mol/L, the molar concentration of molybdenum is 0.005-0.5 mol/L, and the molar concentration of tin is 0.005-0.5 mol/L.
Preferably, the temperature for dissolving the thiourea in the water is 0-90 ℃ and the time is 0.5-2 h.
Preferably, the molybdenum salt and the tin salt are added into the solution and stirred for 0.5-2 hours.
Preferably, the filling degree of the hydrothermal kettle is 40-80%.
Preferably, the hydrothermal reaction time is 2-24 h, and the temperature is 100-250 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. MoS obtained by the method of the invention2/SnS2Photocatalytic material, SnS2Nanosheet and MoS2The nano-sheets are in front of the same homogeneous phaseFormation of MoS in the solution of the driver2And SnS2One-step in-situ growth is realized by sharing S atoms to obtain MoS2/SnS2MoS is adopted as the composite photocatalytic material ratio2Or SnS2The composite material grown as the precursor has greatly reduced interface defects and higher interface conductivity. And the MoS obtained by in-situ growth2/SnS2Photocatalytic material, SnS2The particles grow on MoS2On the surface, the catalyst has smaller particle size and higher catalytic performance. The composite material grown in situ photocatalyzes CO in pure water under the condition of simulating the sun illumination for 10 hours2Reduction can produce 49 mu mol/gcatalyst61. mu. mol/g of methanecatalyst257. mu. mol/g of COcatalystH of (A) to (B)2Showing a higher MoS than the two-step preparation2/SnS2Catalytic material (23. mu. mol/g)catalystMethane of (2), 22. mu. mol/gcatalystCO of 196. mu. mol/gcatalystH of (A) to (B)2) Higher performance.
2. The preparation method does not need special equipment and harsh conditions, has simple process and strong controllability, is easy to realize large-scale production and has practicability.
Drawings
FIG. 1 shows MoS obtained in example 12/SnS2XRD diffraction pattern of photocatalytic material.
FIG. 2 shows MoS obtained in example 12/SnS2Transmission electron micrographs of photocatalytic materials.
FIG. 3 shows MoS obtained in examples 1 and 42/SnS2Photocatalytic material for photocatalytic CO under simulated sunlight2Comparative plot of reduction efficiency.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
A preparation method of a carbon dioxide reduction composite photocatalytic material comprises the following steps:
dissolving 30mmoL of thiourea in 70mL of deionized water at room temperature, and magnetically stirring for 0.5 hour to form a transparent solution;
adding 2.5mmol of Na2MoO4·2H2O and 2.5mmol SnCl4·5H2Adding O into the solution, and stirring at room temperature for 0.5 hour to form a transparent precursor solution;
transferring the precursor suspension into a 100mL hydrothermal kettle, carrying out hydrothermal reaction at 220 ℃ for 18 hours, and naturally cooling to room temperature;
washing a solid sample in a hydrothermal kettle by deionized water, ethanol and the like, and then using a vacuum freeze drying technology to obtain powder, namely MoS growing in situ2/SnS2A photocatalytic material.
FIG. 1 shows MoS obtained in the present example2/SnS2XRD diffraction pattern of the photocatalytic material shows that the MoS is obtained through XRD analysis2/SnS2The photocatalytic material is mainly composed of MoS2,SnS2Composition, containing a small amount of SnS.
FIG. 2 shows MoS obtained in the present example2/SnS2Transmission electron micrograph of photocatalytic material, visible from fig. 2: the diameter of the pore wall of the obtained ordered mesoporous BiO photocatalytic material is 2-3 nm.
To study the photocatalytic CO of the samples prepared2Reduction performance, designing the material to convert pure CO in a pure water system under simulated sunlight2Reduction to methane and CO.
The methane and CO concentrations were measured experimentally by gas chromatography.
Equal amount of MoS2/SnS2Photocatalytic material and pure MoS prepared by hydrothermal method2(obtained in example 2), pure SnS2Photocatalytic Material (obtained in example 3) and MoS prepared in two-step Process2/SnS2Photocatalytic Material (obtained in example 4, labelled MoS2/SnS2TS) are respectively added into 100mL of pure water, and pure CO with 1 atmospheric pressure is introduced into the reactor2And sealing, and then placing under a 300W xenon lamp for irradiating for 6 hours, and detecting the concentration of methane and CO in the reactor.
FIG. 3 shows the MoS obtained in this example2/SnS2Photocatalytic material and comparative photocatalytic material (MoS)2,SnS2,MoS2/SnS2TS) reduction of CO in aqueous xenon lamp solutions2Efficiency versus a graph. As can be seen from fig. 3: the MoS obtained2/SnS2The photocatalytic material exhibits higher catalytic performance than other comparative photocatalytic materials.
Example 2
A preparation method of a carbon dioxide reduction composite photocatalytic material comprises the following steps:
dissolving 15mmoL of thiourea in 70mL of deionized water at room temperature, and magnetically stirring for 0.5 hour to form a transparent solution;
adding 2.5mmol of Na2MoO4·2H2Adding O into the solution, and stirring at room temperature for 0.5 hour to form a transparent precursor solution;
transferring the precursor suspension into a 100mL hydrothermal kettle, carrying out hydrothermal reaction at 220 ℃ for 18 hours, and naturally cooling to room temperature;
washing a solid sample in a hydrothermal kettle by deionized water, ethanol and the like, and then using a vacuum freeze drying technology to obtain powder, namely pure MoS2A photocatalytic material.
Example 3
A preparation method of a carbon dioxide reduction composite photocatalytic material comprises the following steps:
dissolving 15mmoL of thiourea in 70mL of deionized water at room temperature, and magnetically stirring for 0.5 hour to form a transparent solution;
adding 2.5mmol of SnCl4·5H2Adding O into the solution, and stirring at room temperature for 0.5 hour to form a transparent precursor solution;
transferring the precursor suspension into a 100mL hydrothermal kettle, carrying out hydrothermal reaction at 220 ℃ for 18 hours, and naturally cooling to room temperature;
washing a solid sample in a hydrothermal kettle by deionized water, ethanol and the like, and then using a vacuum freeze drying technology to obtain powder, namely pure SnS2A photocatalytic material.
Example 4
A preparation method of a carbon dioxide reduction composite photocatalytic material comprises the following steps:
dissolving 15mmoL of thiourea in 20mL of deionized water at room temperature, and magnetically stirring for 0.5 hour to form a transparent solution;
adding 2.5mmol of SnCl4·5H2Adding O into the solution, and stirring at room temperature for 0.5 hour to form a transparent solution;
0.455g of MoS obtained in example 2 was charged2Ultrasonically dispersing in 50mL of water for 2 hours, and then adding the precursor solution to obtain a precursor suspension;
transferring the precursor suspension into a 100mL hydrothermal kettle, carrying out hydrothermal reaction at 220 ℃ for 18 hours, and naturally cooling to room temperature;
washing a solid sample in a hydrothermal kettle by deionized water, ethanol and the like, and then using a vacuum freeze drying technology to obtain powder, namely MoS prepared by a two-step method2/SnS2A photocatalytic material.

Claims (10)

1. The carbon dioxide reduction composite photocatalytic material is characterized in that the chemical composition of the carbon dioxide reduction composite photocatalytic material is MoS2/SnS2-x
2. The carbon dioxide reducing composite photocatalytic material as set forth in claim 1, wherein the carbon dioxide reducing composite photocatalytic material is obtained by in-situ growth from a precursor solution by a one-step hydrothermal method.
3. The method for preparing the carbon dioxide reduction composite photocatalytic material as recited in claim 1 or 2, wherein thiourea is dissolved in water and stirred into a solution; adding molybdenum salt and tin salt into the solution and stirring to form a precursor solution; and transferring the precursor solution into a hydrothermal kettle, carrying out hydrothermal reaction at 100-300 ℃, washing, and drying to obtain the carbon dioxide reduction composite photocatalytic material.
4. The method of claim 3, wherein the molybdenum salt is at least one of a soluble molybdate, molybdenum chloride and a molybdenum complex; the tin salt is at least one of tin sulfate, tin chloride and a tin complex.
5. The method of claim 4, wherein the soluble molybdate is at least one of sodium molybdate and potassium molybdate.
6. The method according to claim 3, wherein the molar concentration of thiourea, the molar concentration of molybdenum and the molar concentration of tin in the precursor solution are respectively 0.01-10 mol/L, 0.005-0.5 mol/L and 0.005-0.5 mol/L, respectively.
7. The preparation method according to claim 3, wherein the thiourea is dissolved in the water and stirred at the temperature of 0-90 ℃ for 0.5-2 h.
8. The method according to claim 3, wherein the molybdenum salt and the tin salt are added to the solution and stirred for 0.5 to 2 hours.
9. The preparation method according to claim 3, wherein the degree of filling of the hydrothermal reactor is 40 to 80%.
10. The preparation method according to claim 3, wherein the hydrothermal reaction is carried out for 2-24 hours at 100-250 ℃.
CN202110016894.3A 2021-01-07 2021-01-07 Carbon dioxide reduction composite photocatalytic material and preparation method thereof Pending CN112657518A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116139874A (en) * 2023-04-20 2023-05-23 潍坊学院 Catalyst for preparing methanol by circularly using photocatalytic reduction of carbon dioxide and preparation method thereof

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EP3536798A1 (en) * 2018-03-08 2019-09-11 Indian Oil Corporation Limited Bio-assisted process for conversion of carbon-dioxide to fuel precursors
CN110252346A (en) * 2019-05-29 2019-09-20 江苏大学 A kind of MoS2/SnS2The preparation method and purposes of/r-GO composite photo-catalyst
CN112121826A (en) * 2020-10-16 2020-12-25 安徽理工大学 1T @2H-MoS2/SnS2Preparation method, product and application of visible light response photocatalyst

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EP3536798A1 (en) * 2018-03-08 2019-09-11 Indian Oil Corporation Limited Bio-assisted process for conversion of carbon-dioxide to fuel precursors
CN110252346A (en) * 2019-05-29 2019-09-20 江苏大学 A kind of MoS2/SnS2The preparation method and purposes of/r-GO composite photo-catalyst
CN112121826A (en) * 2020-10-16 2020-12-25 安徽理工大学 1T @2H-MoS2/SnS2Preparation method, product and application of visible light response photocatalyst

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116139874A (en) * 2023-04-20 2023-05-23 潍坊学院 Catalyst for preparing methanol by circularly using photocatalytic reduction of carbon dioxide and preparation method thereof
CN116139874B (en) * 2023-04-20 2023-06-16 潍坊学院 Catalyst for preparing methanol by circularly using photocatalytic reduction of carbon dioxide and preparation method thereof

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