CN111530484A - Lighting lamp with air purification function - Google Patents

Lighting lamp with air purification function Download PDF

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Publication number
CN111530484A
CN111530484A CN202010380522.4A CN202010380522A CN111530484A CN 111530484 A CN111530484 A CN 111530484A CN 202010380522 A CN202010380522 A CN 202010380522A CN 111530484 A CN111530484 A CN 111530484A
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photocatalyst
nano
product
bismuth titanate
bismuth
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张景松
张爱芬
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Quanzhou Xinchuangyuan Intelligent Technology Co ltd
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Quanzhou Xinchuangyuan Intelligent Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39—Photocatalytic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/864—Removing carbon monoxide or hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/18—Arsenic, antimony or bismuth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/31—Chromium, molybdenum or tungsten combined with bismuth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/20—Carbon compounds
    • B01J27/22—Carbides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/80—Type of catalytic reaction
    • B01D2255/802—Photocatalytic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7027—Aromatic hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

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Abstract

The invention relates to a lighting lamp with an air purification function, which comprises an electric light source, a lamp holder and a lampshade, wherein the outer surface of the lampshade is uniformly sprayed with a layer of photocatalyst film, the photocatalyst film is prepared from a photocatalyst and a film-forming agent, the photocatalyst is formed by aggregating bismuth titanate nano-sheets and titanium carbide nano-sheets on nano-alumina particles and has a porous surface; the multifunctional air purifier combines air purification with a daily lighting lamp, purifies indoor air while lighting, realizes the multifunction of the lighting lamp, and has the characteristics of good purification effect and long service life.

Description

Lighting lamp with air purification function
Technical Field
The invention relates to the field of lighting lamps, in particular to a lighting lamp with an air purification function.
Background
Interior decoration and buildingThe household environmental pollution caused by the pollutants in the materials is well noticed by people, a plurality of volatile organic compounds exist in indoor air, carcinogenic substances and pathogenic viruses are not lacked, unknown components are quite complex, most representative formaldehyde greatly increases carcinogenic risk, and therefore various purifiers are produced at the same time2The oxide-type photocatalyst represented by the above has excellent catalytic properties and stable chemical properties, but has a wide forbidden band and absorbs only ultraviolet light, and a ternary bismuth oxide semiconductor represented by bismuth titanate attracts attention as a photocatalyst having visible light catalytic activity, but pure Bi has been used as the photocatalyst4Ti3O12The absorption efficiency of visible light is not high, and the electron-hole recombination rate is high, so that the photocatalysis efficiency is low; in addition, the lamp is an indoor lighting device which is commonly used, and the function is single.
Disclosure of Invention
In order to solve the problems, the invention provides an illuminating lamp with an air purification function.
The purpose of the invention is realized by adopting the following technical scheme:
a lighting lamp with air purification function comprises an electric light source, a lamp holder and a lampshade, wherein a layer of photocatalyst film is uniformly sprayed on the outer surface of the lampshade; the photocatalyst film is prepared from a photocatalyst and a film-forming agent;
the photocatalyst comprises bismuth titanate nano sheets and titanium carbide nano sheets, and the preparation method comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, filtering out a product after self-cooling, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170 ℃ and 180 ℃ for 18-20h, filtering out a product after self-cooling, washing the product with deionized water and absolute ethyl alcohol respectively, and drying the product for 8h at 70 ℃ to obtain a bismuth titanate nano sheet;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding a bismuth titanate nano sheet and a titanium carbide nano sheet, wherein the mass ratio of aluminum oxide to bismuth titanate to titanium carbide is 1 (1.6-2.4) to 0.6-0.8, the solid-to-liquid ratio is 50-80, stirring at a low speed for 2-5h by a magnetic force of 120r/min for 100-one year, filtering out a product, washing with deionized water, and drying to obtain the photocatalyst.
Preferably, the photocatalyst thin film has a thickness of 5 to 10 μm.
Preferably, the film former is polyvinyl alcohol.
Preferably, the bismuth titanate nanosheet is a chromium-doped bismuth titanate nanosheet, and the preparation method thereof is as follows:
before the hydrothermal reaction for preparing the precursor product is started, chromium nitrate nonahydrate with the molar weight of 10-20% of tetrabutyl titanate is added into a reaction system, then the hydrothermal reaction is carried out, and the bismuth titanate nanosheet is prepared from the prepared precursor product.
Preferably, the photocatalyst surface is also modified and grafted with amino groups, and the preparation method comprises the following steps:
dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding bismuth titanate nano sheets and titanium carbide nano sheets, stirring at a magnetic force of 120r/min at a low speed for 2-5h and keeping the temperature and stirring, adding 10% of N, N-dimethylformamide of the solution volume, adding epoxy chloropropane with the final concentration of 0.5-1%, dropwise adding pentaethylenehexamine or triethylenetetramine with the volume being twice that of epoxy chloropropane, continuously stirring at a low speed for 1h, obtaining a product, washing with dilute ammonia water and deionized water respectively, and drying to obtain the nano aluminum oxide.
Preferably, the particle size of the nano alumina is in the range of 20-80 nm.
Preferably, an ultraviolet light emitting element for assisting in exciting the photocatalyst is further disposed in the lamp housing.
The invention has the beneficial effects that:
(1) the invention combines an air purifier with a daily lighting lamp, provides a lighting lamp with an air purification function, purifies indoor air while lighting by loading a photocatalyst coating on the outer surface of a lampshade, and realizes the multifunction of the lighting lamp.
(2) The method takes dispersed nano aluminum oxide with positive surface charge as a core, titanium carbide nano sheets with negative charge and bismuth titanate nano sheets in an induction solution are gathered and combined on the surface of the nano aluminum oxide to form a porous micro-nano structure, a catalyst with ultrathin, microporous and mesoporous structures has extremely high specific surface area, the catalytic degradation activity of bismuth titanate is improved, and the high electron conductivity and photo-thermal effect of titanium carbide also play a role in promoting catalysis of bismuth titanate.
Detailed Description
The invention is further described with reference to the following examples.
The embodiment of the application relates to an illuminating lamp with an air purification function, which comprises an electric light source, a lamp holder and a lampshade, wherein a layer of photocatalyst film is uniformly sprayed on the outer surface of the lampshade; the photocatalyst film is prepared from a photocatalyst and a film-forming agent;
the photocatalyst comprises bismuth titanate nano sheets and titanium carbide nano sheets, and the preparation method comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, filtering out a product after self-cooling, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170 ℃ and 180 ℃ for 18-20h, filtering out a product after self-cooling, washing the product with deionized water and absolute ethyl alcohol respectively, and drying the product for 8h at 70 ℃ to obtain a bismuth titanate nano sheet;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding a bismuth titanate nano sheet and a titanium carbide nano sheet, wherein the mass ratio of aluminum oxide to bismuth titanate to titanium carbide is 1 (1.6-2.4) to 0.6-0.8, the solid-to-liquid ratio is 50-80, stirring at a low speed for 2-5h by a magnetic force of 120r/min for 100-one year, filtering out a product, washing with deionized water, and drying to obtain the photocatalyst.
Bismuth titanate (Bi)4Ti3O12) As a typical Aurivillius compound, the compound has a unique crystal structure (alternate (Bi) as a photocatalyst with visible light catalytic activity2O2)2+And (Bi)2Ti3O10)2-Layer) and electronic structures (hybrid bandgaps in Bi6s and O2 p), have received much attention. However, Bi alone4Ti3O12Relatively limited visible light absorption capability, and the high electron-hole recombination rate limits its further applications; titanium carbide (Ti)3C2Tx) The two-dimensional layered transition metal carbide has good conductivity, excellent microwave absorption and electromagnetic shielding performance, and high light absorption rate and high-efficiency photothermal conversion.
The invention takes dispersed nano-alumina with positive surface charge as a core, induces titanium carbide nano-sheets and bismuth titanate nano-sheets with negative charge in solution to be aggregated and combined on the surface, because the edge charge density of the nano-sheets is higher, the nano-sheets tend to be vertically combined on the surface of the alumina core, and the aggregation of the nano-sheets forms a multi-pore micro-nano structure, on one hand, the catalyst with ultrathin, micropore and mesoporous structure has extremely high specific surface area, can expose a large number of active sites, shortens the transmission distance of current carriers, reduces the recombination probability of electron-hole, thereby improving the catalytic degradation activity, on the other hand, the light absorption utilization rate of light is improved through multiple reflections in the multi-pore structure, and simultaneously, the photo-generated current carriers can be rapidly led out due to the high electron conductivity of titanium carbide, therefore, the composition is reduced, the absorption efficiency of visible light is improved by the efficient photo-thermal effect of the bismuth titanate nano-sheet, the bismuth titanate nano-sheet can be activated by local energy generated by the bismuth titanate nano-sheet, the bismuth titanate nano-sheet can play a role in promoting catalysis, and the photocatalytic reaction is promoted.
Preferably, the photocatalyst thin film has a thickness of 5 to 10 μm.
If the thickness of the photocatalyst film is too small, the catalytic effect is not good, while if the thickness of the photocatalyst film is too thick, the transmittance of light and the lighting effect are affected, and the requirements on the catalytic effect and the lighting effect can be balanced by proper film thickness.
Preferably, the film former is polyvinyl alcohol.
The polyvinyl alcohol has high solubility, good film forming property and excellent flexibility of formed film.
Preferably, the bismuth titanate nanosheet is a chromium-doped bismuth titanate nanosheet, and the preparation method thereof is as follows:
before the hydrothermal reaction for preparing the precursor product is started, chromium nitrate nonahydrate with the molar weight of 10-20% of tetrabutyl titanate is added into a reaction system, then the hydrothermal reaction is carried out, and the bismuth titanate nanosheet is prepared from the prepared precursor product.
The introduction of the chromium element can improve the photocatalytic performance of bismuth titanate and the catalytic degradation rate and degradation effect of the catalyst on organic matters, and the contribution of the 3d orbit of the chromium element to the conduction band and valence band electrons of bismuth titanate promotes the electron transmission on the energy level, so that the band gap value is reduced, the response range to a visible light region is widened, and the catalytic activity is improved.
Preferably, the photocatalyst surface is also modified and grafted with amino groups, and the preparation method comprises the following steps:
dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding bismuth titanate nano sheets and titanium carbide nano sheets, stirring at a magnetic force of 120r/min at a low speed for 2-5h and keeping the temperature and stirring, adding 10% of N, N-dimethylformamide of the solution volume, adding epoxy chloropropane with the final concentration of 0.5-1%, dropwise adding pentaethylenehexamine or triethylenetetramine with the volume being twice that of epoxy chloropropane, continuously stirring at a low speed for 1h, obtaining a product, washing with dilute ammonia water and deionized water respectively, and drying to obtain the nano aluminum oxide.
The invention introduces functional groups with Lewis basic centers on the surface of the catalyst by surface modification of grafted amino groups, so that the catalyst is not easy to generate carbon deposition and is inactivated, the catalytic stability is improved, and the effects of stabilizing cavities and prolonging the service life of carriers are achieved.
Preferably, the particle size of the nano alumina is in the range of 20-80 nm.
The particle size of the nano-alumina has great influence on the performance of the prepared photocatalyst, and the formation of aggregates is not facilitated by too small or too large particle size, so that the catalytic activity is influenced.
Preferably, an ultraviolet light emitting element for assisting in exciting the photocatalyst is further disposed in the lamp housing.
Bismuth titanate has photoresponse activity to ultraviolet light, can further improve the catalytic degradation effect to organic pollutant through set up the ultraviolet component in the lamp shade, but set up the ultraviolet component and probably cause to have the ultraviolet ray to reveal.
Example 1
A photocatalyst comprises bismuth titanate nano-sheets and titanium carbide nano-sheets, and the preparation method comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, filtering out a product after self-cooling, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170-;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, wherein the particle size of the nano aluminum oxide is 20-80nm, heating in a water bath to 60-65 ℃, adding bismuth titanate nanosheets and titanium carbide nanosheets, wherein the mass ratio of the aluminum oxide to the bismuth titanate to the titanium carbide is 1 (1.6-2.4) to (0.6-0.8), the solid-liquid ratio is 50-80, stirring at a low speed for 2-5h by a magnetic force of 120r/min for 100 plus materials, filtering out a product, washing with deionized water, and drying to obtain the photocatalyst.
Example 2
A photocatalyst, the preparation method of which comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, adding 0.124g of chromium nitrate nonahydrate, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, self-cooling, filtering out a product, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170-;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, wherein the particle size of the nano aluminum oxide is 20-80nm, heating in a water bath to 60-65 ℃, adding bismuth titanate nanosheets and titanium carbide nanosheets, wherein the mass ratio of the aluminum oxide to the bismuth titanate to the titanium carbide is 1 (1.6-2.4) to (0.6-0.8), the solid-liquid ratio is 50-80, stirring at a low speed for 2-5h by a magnetic force of 120r/min for 100 plus materials, filtering out a product, washing with deionized water, and drying to obtain the photocatalyst.
Example 3
A photocatalyst, the preparation method of which comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, adding 0.124g of chromium nitrate nonahydrate, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, self-cooling, filtering out a product, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170-;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, wherein the particle size of the nano aluminum oxide is 20-80nm, heating in a water bath to 60-65 ℃, adding bismuth titanate nanosheets and titanium carbide nanosheets, stirring at a low speed for 2-5h by using a magnetic force of 120r/min and keeping the temperature and stirring, adding N, N-dimethylformamide with the volume of 10% of the solution, adding epoxy chloropropane with the final concentration of 0.5-1%, dropwise adding pentaethylenehexamine or triethylenetetramine with the volume twice that of the epoxy chloropropane, continuously stirring at a low speed for 1h, obtaining a product, washing with dilute ammonia water and deionized water respectively, and drying to obtain the photocatalyst.
Example 4
A lighting lamp with air purification function comprises an electric light source, a lamp holder and a lampshade, wherein a layer of photocatalyst film is uniformly sprayed on the outer surface of the lampshade, the thickness of the photocatalyst film is 5-10 mu m, and the photocatalyst film is prepared from photocatalyst and polyvinyl alcohol; the photocatalyst is prepared by the preparation method of the embodiment 1, the embodiment 2 or the embodiment 3;
and an ultraviolet light emitting element for assisting in exciting the photocatalyst is also arranged in the lampshade.
Evaluation of catalytic Activity:
a fixed bed microreactor in a continuous flow mode is adopted, the reaction temperature is controlled to be 30 ℃, 0.1g of catalyst and 1g of 60-mesh high-purity quartz sand are mixed and then are loaded into a reactor, catalyst samples comprise the catalyst prepared by the preparation method in the embodiment 1-3, barium titanate nanosheets and direct mixtures of the barium titanate nanosheets and titanium carbide nanosheets, xenon lamps are arranged around the reactor for irradiation, a xenon lamp with a 420nm cut-off filter is used for comparison, 250ppm of benzene vapor or 100ppm of formaldehyde is used as reaction gas, the flow rate is 30ml/min, an online gas chromatograph is used for detecting the concentration of residual benzene or formaldehyde, and the degradation rate is calculated according to the concentration difference, wherein the results are as follows:
Figure BDA0002481880950000061
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. The photocatalyst is characterized by comprising bismuth titanate nanosheets and titanium carbide nanosheets, and the preparation method comprises the following steps:
s1 preparation of bismuth titanate nanosheet
Adding 10ml of N, N-dimethylformamide into 25ml of isopropanol, uniformly mixing, adding 1ml of tetrabutyl titanate while stirring, continuously stirring to fully mix, transferring into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 180 ℃ and the hydrothermal time of 20-24h, filtering out a product after self-cooling, washing with absolute ethyl alcohol, and drying at 80 ℃ for 10h to obtain a precursor product; weighing 9.7g of bismuth nitrate pentahydrate, dissolving the bismuth nitrate pentahydrate into ethylene glycol, weighing 2.4g of a precursor product, dissolving the precursor product into water, slowly adding an aqueous solution of the precursor product into an ethylene glycol solution of the bismuth nitrate while stirring, fully and uniformly mixing, then moving the mixture into a polytetrafluoroethylene hydrothermal reaction kettle for hydrothermal reaction at the hydrothermal temperature of 170 ℃ and 180 ℃ for 18-20h, filtering out a product after self-cooling, washing the product with deionized water and absolute ethyl alcohol respectively, and drying the product for 8h at 70 ℃ to obtain a bismuth titanate nano sheet;
s2 preparation of photocatalyst
Dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding a bismuth titanate nano sheet and a titanium carbide nano sheet, wherein the mass ratio of aluminum oxide to bismuth titanate to titanium carbide is 1 (1.6-2.4) to 0.6-0.8, the solid-to-liquid ratio is 50-80, stirring at a low speed for 2-5h by a magnetic force of 120r/min for 100-one year, filtering out a product, washing with deionized water, and drying to obtain the photocatalyst.
2. The photocatalyst as claimed in claim 1, wherein the nano alumina has a particle size in the range of 20 to 80 nm.
3. The photocatalyst as claimed in claim 1, wherein the bismuth titanate nanosheet is a chromium-doped bismuth titanate nanosheet, and the preparation method thereof is:
before the hydrothermal reaction for preparing the precursor product is started, chromium nitrate nonahydrate with the molar weight of 10-20% of tetrabutyl titanate is added into a reaction system, then the hydrothermal reaction is carried out, and the bismuth titanate nanosheet is prepared from the prepared precursor product.
4. The photocatalyst of claim 1, wherein the photocatalyst surface is further modified and grafted with amino groups, and the preparation method comprises:
dispersing nano aluminum oxide in an aqueous solution, heating in a water bath to 60-65 ℃, adding bismuth titanate nano sheets and titanium carbide nano sheets, stirring at a magnetic force of 120r/min at a low speed for 2-5h and keeping the temperature and stirring, adding 10% of N, N-dimethylformamide of the solution volume, adding epoxy chloropropane with the final concentration of 0.5-1%, dropwise adding pentaethylenehexamine or triethylenetetramine with the volume being twice that of epoxy chloropropane, continuously stirring at a low speed for 1h, obtaining a product, washing with dilute ammonia water and deionized water respectively, and drying to obtain the nano aluminum oxide.
5. A lighting lamp with air purification function, characterized by that, including electric light source, lamp holder and lamp shade, the outer surface of the lamp shade sprays a layer of light catalyst film evenly; the photocatalyst film is prepared from a photocatalyst and a film-forming agent; the photocatalyst is the photocatalyst according to any one of claims 1 to 4.
6. The illumination lamp with air purification function according to claim 5, wherein the thickness of the photocatalyst film is 5-10 μm.
7. The illuminating lamp with the air purifying function according to claim 5, wherein the film forming agent is polyvinyl alcohol.
8. The illuminating lamp with the air purifying function according to claim 5, wherein an ultraviolet light emitting element for assisting in exciting the photocatalyst is further provided in the lamp housing.
CN202010380522.4A 2020-05-08 2020-05-08 Lighting lamp with air purification function Withdrawn CN111530484A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113341015A (en) * 2021-06-04 2021-09-03 国家烟草质量监督检验中心 Method for determining triazole fungicide in plant-derived food

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113341015A (en) * 2021-06-04 2021-09-03 国家烟草质量监督检验中心 Method for determining triazole fungicide in plant-derived food
CN113341015B (en) * 2021-06-04 2023-09-22 国家烟草质量监督检验中心 Method for determining triazole fungicide in plant-derived food

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Application publication date: 20200814