Laminated photocatalytic microreactor based on solar fluorescence collection effect

Abstract

The present invention provides a laminated photocatalytic microreactor based on the solar fluorescence light collection effect, comprising an upper microchannel reaction layer, a fluorescent emission layer, and a lower microchannel reaction layer. The fluorescent emission layer is located between the upper and lower microchannel reaction layers, and the upper, fluorescent emission, and lower microchannel reaction layers are all made of transparent materials. The upper and lower microchannel reaction layers are respectively used to perform different photocatalytic reactions and use two different photocatalysts. The wavelength of sunlight absorbed by the fluorescent material in the fluorescent emission layer is different from the excitation wavelength required by the photocatalyst in the upper microchannel reaction layer. The fluorescence wavelength excited by the fluorescent material in the fluorescent emission layer matches the excitation wavelength required by the photocatalyst in the lower microchannel reaction layer. This microreactor has the advantages of fully absorbing sunlight of different wavelengths and improving solar energy utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of photocatalytic reactions, in particular to a laminated photocatalytic microreactor based on solar fluorescent light collection effect. Background Art

[0002] Photocatalysis is a chemical reaction that occurs under the influence of light. Photocatalysts absorb light of a specific wavelength and become excited, promoting the conversion of reactants. The wavelength of light required to stimulate this reaction varies depending on the type of photocatalyst used.

[0003] The solar spectrum is broad, divided into infrared, visible, and ultraviolet regions. For photocatalysts that absorb only specific wavelengths, the efficiency of light energy utilization is low. To improve light energy utilization and increase the efficiency of photocatalytic reactors, researchers have conducted extensive research in recent years, leading to the development of microreactor technology.

[0004] Microreactor technology is widely used in photocatalytic reactions due to its large specific surface area and excellent heat and mass transfer properties. Compared with conventional reactors, the transmission distance of light and reactants in photocatalytic microreactors is shortened, and the mass transfer efficiency is improved.

[0005] However, for photocatalysts, the received light intensity does not increase. Except for the specific wavelength of light absorbed by the catalyst, the rest of the sunlight escapes from the reactor, and the light energy utilization rate is not high. Therefore, it is very necessary to improve the structure and performance of photocatalytic microreactors to improve the light energy utilization rate.

[0006] The solar fluorescence collection effect can use fluorescent substances to absorb sunlight of a certain wavelength and convert it into fluorescence of different wavelengths, thereby achieving the effect of sunlight wavelength conversion. Therefore, the fluorescence collection effect is applied to microreactors to improve light utilization efficiency. However, the current application methods are relatively simple and do not give full play to the fluorescence collection effect. There is still the problem of some sunlight escaping.

[0007] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0008] The purpose of the present invention is to address the deficiencies of the existing technology and thus provide a laminated photocatalytic microreactor based on the solar fluorescence light collection effect that fully utilizes sunlight, fully absorbs sunlight of different wavelengths, and improves solar energy utilization efficiency.

[0009] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a laminated photocatalytic microreactor based on the solar fluorescence light collection effect, comprising an upper microchannel reaction layer, a fluorescence emission layer and a lower microchannel reaction layer, wherein the fluorescence emission layer is located between the upper microchannel reaction layer and the lower microchannel reaction layer, and the upper microchannel reaction layer, the fluorescence emission layer and the lower microchannel reaction layer are all made of transparent materials;

[0010] The upper microchannel reaction layer and the lower microchannel reaction layer are respectively used to perform different photocatalytic reactions and use two different photocatalysts;

[0011] The wavelength of sunlight absorbed by the fluorescent material in the fluorescent emission layer is different from the excitation wavelength required by the photocatalyst in the upper microchannel reaction layer;

[0012] The fluorescence wavelength excited by the fluorescent material in the fluorescent emission layer matches the excitation wavelength required by the photocatalyst in the underlying microchannel reaction layer.

[0013] Based on the above, the upper microchannel reaction layer, the fluorescent emission layer and the lower microchannel reaction layer constitute a reaction unit, and the reaction unit is wrapped with a light reflecting container with a transparent top and reflective sides and bottom.

[0014] Based on the above, the light reflective container includes an upper cover plate, a lower cover plate and surrounding side plates. The upper cover plate is made of highly transparent material, the lower cover plate is made of reflective material, and the side plates are reflectors.

[0015] Based on the above, the side plates are fixed to the periphery of the upper microchannel reaction layer or the lower microchannel reaction layer or the fluorescent emission layer by ultraviolet curing adhesive.

[0016] Based on the above, serpentine microchannels are distributed in the upper microchannel reaction layer and the lower microchannel reaction layer.

[0017] Based on the above, the photocatalyst is supported on the wall surface of the serpentine microchannel.

[0018] Based on the above, the inlet and outlet of the reaction channel in the upper microchannel reaction layer are located at the top, and the inlet and outlet of the reaction channel in the lower microchannel reaction layer are located at the bottom.

[0019] Based on the above, the inlet and outlet of the upper microchannel reaction layer are arranged through the upper cover plate, and the inlet and outlet of the lower microchannel reaction layer are arranged through the lower cover plate.

[0020] Based on the above, the fluorescent emission layer includes a mixture of a transparent solid medium and a fluorescent material.

[0021] Based on the above, the upper cover plate and the upper microchannel reaction layer are made of highly transparent organic glass, and the lower cover plate is made of white organic glass.

[0022] The present invention has outstanding substantial features and significant progress compared to the prior art. Specifically, the present invention has the following advantages:

[0023] 1. This solution utilizes stacked microreactors and the principle of fluorescence light collection to enable the upper and lower microchannel reaction layers to absorb light of different matching wavelengths, significantly improving the utilization efficiency of solar energy. Compared with a simple stacking method, the light energy utilization rate of the lower microchannel reaction layer is not reduced.

[0024] 2. Set up a light-reflecting container to fully reflect and utilize the incident sunlight, prevent light from escaping, and improve light utilization efficiency.

[0025] 3. The internal microchannel adopts a serpentine structure, and the catalyst is loaded on the inner wall of the microchannel. With the help of transparent microreactors and light-reflecting containers, it is fully exposed to light from all sides, further improving the efficiency of light utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective exploded structural diagram of a laminated photocatalytic microreactor based on the solar fluorescent light collection effect in the present invention.

[0027] Figure 2 It is a schematic diagram of the explosion structure of the laminated photocatalytic microreactor based on the solar fluorescence light collection effect in the present invention.

[0028] Figure 3 It is a structural diagram of the upper and lower microchannel reaction layers in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the upper and lower cover plates in the present invention.

[0030] In the figure: 1. Upper microchannel reaction layer; 2. Fluorescence emission layer; 3. Lower microchannel reaction layer; 4. Front side plate; 5. Back side plate; 6. Left side plate; 7. Right side plate; 8. Upper cover plate; 9. Lower cover plate; 10. Serpentine microchannel; 11. Inlet; 12. Outlet. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0032] like Figure 1-Figure 3As shown, a stacked photocatalytic microreactor based on the solar fluorescent light collection effect includes an upper microchannel reaction layer 1, a fluorescent emission layer 2 and a lower microchannel reaction layer 3. The fluorescent emission layer 2 is located between the upper microchannel reaction layer 1 and the lower microchannel reaction layer 3. In this way, after the sunlight is absorbed by the upper microchannel reaction layer 1, the remaining wavelength of light enters the fluorescent emission layer 2 and is excited by the fluorescent emission layer to become light of other wavelengths.

[0033] Serpentine microchannels 10 are distributed in the upper microchannel reaction layer 1 and the lower microchannel reaction layer 3 to increase the length of the reaction channel. The photocatalyst is loaded on the wall of the serpentine microchannel and can fully contact with light from all directions to catalyze the reaction substances.

[0034] The upper microchannel reaction layer 1 , the fluorescent emission layer 2 and the lower microchannel reaction layer 3 are all made of transparent materials, allowing sunlight to pass through and react with the reaction substances inside.

[0035] The upper microchannel reaction layer 1 and the lower microchannel reaction layer 3 are made of highly transparent organic glass or a polymer material, polydimethylsiloxane, which has good machinability and stability. Therefore, the serpentine microchannels can be prepared by machining or photolithography. The photocatalyst can be loaded onto the microchannels by physical or chemical deposition.

[0036] The fluorescent emission layer includes a mixture of a transparent solid medium and a fluorescent material. The fluorescent material can be selected from fluorescent organic dyes, semiconductor quantum dots or transition metal ion complexes. The transparent solid medium can be selected from polymethyl methacrylate (PMMA) as a matrix material. Thanks to the excellent optical properties and dopability of PMMA, the fluorescent material can be directly physically doped into the PMMA prepolymer, and the fluorescent emission layer can be obtained by stirring and molding.

[0037] The upper microchannel reaction layer 1 and the lower microchannel reaction layer 3 are respectively used to carry out different photocatalytic reactions and use two different photocatalysts. The wavelength of sunlight absorbed by the fluorescent material in the fluorescent emission layer 2 is different from the excitation wavelength required by the photocatalyst in the upper microchannel reaction layer 1; the fluorescence wavelength excited by the fluorescent material in the fluorescent emission layer 2 matches the excitation wavelength required by the photocatalyst in the lower microchannel reaction layer 3.

[0038] Its function is as follows: the upper microchannel reaction layer 1 absorbs the spectrum of matching wavelengths from sunlight and reacts with the reactants in the upper microchannel. The remaining sunlight is irradiated to the fluorescent emission layer 2, and after being absorbed by the fluorescent emission layer 2, it excites the required wavelength in the lower microchannel reaction layer 3, and then reacts with the reactants in the lower microchannel reaction layer 3, thereby achieving an improvement in the utilization rate of solar energy.

[0039] In a preferred embodiment, in order to further improve the utilization rate of sunlight and prevent sunlight from escaping, the upper microchannel reaction layer 1, the fluorescent emission layer 2 and the lower microchannel reaction layer 3 constitute a reaction unit. The reaction unit is wrapped with a light-reflecting container with a transparent top and reflective sides and bottom. The size of the light-reflecting container can completely block the reaction unit, so that the overflowing fluorescence can be reflected back, increasing the light intensity of the reaction.

[0040] Specifically, the light reflective container includes an upper cover plate 8, a lower cover plate 9, and a front side plate 4, a rear side plate 5, a left side plate 6, and a right side plate 7 around it. The upper cover plate 8 is made of highly transparent organic glass, the lower cover plate 9 is made of white organic glass, and the side plates are all reflectors. The side plates are respectively fixed to the upper microchannel reaction layer or the lower microchannel reaction layer or the fluorescent emission layer by ultraviolet curing glue.

[0041] The inlet 11 and outlet 12 of the reaction channel in the upper microchannel reaction layer 1 are located at the top and are arranged through the upper cover plate 8, and the inlet and outlet of the reaction channel in the lower microchannel reaction layer are located at the bottom and are arranged through the lower cover plate.

[0042] Working principle:

[0043] Sunlight enters the light reflective container from the top cover plate 8, and first contacts the reactants and photocatalyst in the upper microchannel reaction layer 1. Due to the limited spectral absorption range of the photocatalyst, a portion of the light is absorbed by the photocatalyst and promotes the reaction of the reactants. The solar spectrum not absorbed in the upper microchannel reaction layer 1 is absorbed by the middle fluorescent emission layer and then excited to form a spectrum that matches the photocatalyst in the lower microchannel reaction layer 2. The reactants in the lower microchannel reaction layer 2 promote the reaction of the reactants under the catalysis of the photocatalyst, thereby improving the overall utilization rate of the solar energy spectrum.

[0044] In addition, during this process, the light-reflecting container uses the reflectors on all sides and the white glass at the bottom to reflect the overflowing sunlight and fluorescence back into the reaction unit, thereby increasing the light intensity and promoting the improvement of the conversion rate.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention. They should all be included in the scope of the technical solution for protection of the present invention.

Claims

1. A laminated photocatalytic microreactor based on solar fluorescence collection effect, characterized by: It includes an upper microchannel reaction layer, a fluorescent emission layer and a lower microchannel reaction layer, wherein the fluorescent emission layer is located between the upper microchannel reaction layer and the lower microchannel reaction layer, and the upper microchannel reaction layer, the fluorescent emission layer and the lower microchannel reaction layer are all made of transparent materials; The upper microchannel reaction layer and the lower microchannel reaction layer are respectively used to perform different photocatalytic reactions and use two different photocatalysts; The wavelength of sunlight absorbed by the fluorescent material in the fluorescent emission layer is different from the excitation wavelength required by the photocatalyst in the upper microchannel reaction layer; The fluorescence wavelength excited by the fluorescent material in the fluorescent emission layer matches the excitation wavelength required by the photocatalyst in the lower microchannel reaction layer; The upper microchannel reaction layer absorbs the spectrum of matching wavelengths from sunlight and reacts with the reactants in the upper microchannel. The remaining sunlight is irradiated to the fluorescent emission layer, absorbed by the fluorescent emission layer, and excites the required wavelength in the lower microchannel reaction layer, which then reacts with the reactants in the lower microchannel reaction layer.

2. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 1, characterized in that: The upper microchannel reaction layer, the fluorescent emission layer and the lower microchannel reaction layer constitute a reaction unit, and the reaction unit is wrapped with a light reflecting container with a transparent top and reflective sides and bottom.

3. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 2, characterized in that: The light reflecting container comprises an upper cover plate, a lower cover plate and surrounding side plates. The upper cover plate is made of a highly transparent material, the lower cover plate is made of a reflective material, and the side plates are reflectors.

4. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 3, characterized in that: The side plates are fixed to the periphery of the upper microchannel reaction layer or the lower microchannel reaction layer or the fluorescent emission layer respectively through ultraviolet curing adhesive.

5. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to any one of claims 1 to 4, characterized in that: Serpentine microchannels are distributed in the upper microchannel reaction layer and the lower microchannel reaction layer.

6. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 5, characterized in that: The photocatalyst is supported on the wall surface of the serpentine microchannel.

7. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 1, 2, 3, 4 or 6, characterized in that: The inlet and outlet of the reaction channel in the upper microchannel reaction layer are located at the top, and the inlet and outlet of the reaction channel in the lower microchannel reaction layer are located at the bottom.

8. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 7, characterized in that: The inlet and outlet of the upper microchannel reaction layer are arranged through the upper cover plate, and the inlet and outlet of the lower microchannel reaction layer are arranged through the lower cover plate.

9. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 1 or 2 or 3 or 4 or 6 or 8, characterized in that: The fluorescent emission layer comprises a mixture of a transparent solid medium and a fluorescent material.

10. The laminated photocatalytic microreactor based on solar fluorescence light collection effect according to claim 3, characterized in that: The upper cover plate and the upper microchannel reaction layer are made of highly transparent organic glass, and the lower cover plate is made of white organic glass.

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