CN112517047A - Preparation method of carbon nitride/titanium dioxide embedded heterojunction, product and application thereof - Google Patents

Preparation method of carbon nitride/titanium dioxide embedded heterojunction, product and application thereof Download PDF

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CN112517047A
CN112517047A CN202011595944.XA CN202011595944A CN112517047A CN 112517047 A CN112517047 A CN 112517047A CN 202011595944 A CN202011595944 A CN 202011595944A CN 112517047 A CN112517047 A CN 112517047A
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titanium dioxide
carbon nitride
nano titanium
heterojunction
dispersion liquid
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崔大祥
徐少洪
王敬锋
林琳
陈超
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Shanghai National Engineering Research Center for Nanotechnology Co Ltd
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    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
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    • B01J37/0009Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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Abstract

The invention relates to a preparation method of a carbon nitride/titanium dioxide embedded heterojunction, a product and application thereof, and the preparation method is used for preparing the carbon nitride/titanium dioxide embedded heterojunction photocatalyst by one-step roasting in a mode of mixing a nano titanium dioxide dispersion liquid and a carbon nitride precursor. The carbon nitride/titanium dioxide heterojunction prepared by the method has the advantages of high separation efficiency of photoproduction electrons and holes, good performance of photocatalytic degradation of formaldehyde, simple operation and lower difficulty, and is suitable for large-scale production.

Description

Preparation method of carbon nitride/titanium dioxide embedded heterojunction, product and application thereof
Technical Field
The invention belongs to the field of nano material preparation, and particularly relates to a preparation method of a carbon nitride/titanium dioxide embedded heterojunction, a product and application thereof.
Background
Energy is the material basis on which humans live and on which human civilization exists. Since the 21 st century, with the rapid development of industry, the demand of human beings for energy has been greatly increased, which causes the exhaustion of non-renewable fossil energy on the one hand and also brings about very serious environmental problems on the other hand. Because solar energy has the characteristics of cleanness, large energy, abundant reserves and the like, the technology for utilizing the solar energy becomes a key for solving the energy and environmental crisis in the new century. The photocatalytic technology is a new technology which can utilize solar energy to purify the environment and convert energy and is rapidly developed in recent years. The general energy band gap is moderate, electrons can jump under the irradiation of sunlight, so that high-energy photo-generated electrons and photo-generated hole pairs are formed, when the photo-generated electrons and the photo-generated hole pairs contact with oxygen and water in the air, redox reaction can be carried out to generate active free radicals such as superoxide free radicals, hydroxyl free radicals and the like, and the free radicals can degrade pollutants, kill bacteria, viruses and the like. Compared with other technologies, the photocatalysis technology is safe, efficient and free of secondary pollution, and pollutants are thoroughly oxidized and decomposed into CO2、H2O and the like. However, the existing photocatalytic materials still have various problems.
The carbon nitride is a yellow nano crystal synthesized by roasting a material rich in carbon elements and nitrogen elements to a certain extent. Its crystal structure is similar to that of graphite. Because the carbon nitride groups are only in one molecular layer, only weak van der waals forces can link different molecular layers. It is well known that light can generate electron-hole pairs in such materials. Therefore, carbon nitride has excellent photocatalytic performance. The device can convert low-density solar energy into high-density chemical energy or directly degrade and mineralize organic pollutants, and has important application prospect in the aspects of solving the problems of energy shortage, environmental pollution and the like. However, the photo-generated electrons and holes are easy to recombine before catalytic reaction occurs, which severely limits the catalytic efficiency.
Due to the difference of valence band and conduction band positions of the two semiconductors, when light is irradiated by sunlight to separate electrons and holes, the photogenerated electrons and the holes can migrate, so that the electrons and the holes are respectively positioned on the surfaces of different semiconductors, and the recombination of the photogenerated electrons and the holes is further inhibited. However, the heterojunction structure constructed at present is often too loose, and the transmission of photogenerated carriers at the interface of the two needs to cross a larger potential barrier, which causes unnecessary recombination at the interface of the two, and limits the improvement of the separation efficiency of the photogenerated electron/hole pairs.
Disclosure of Invention
Aiming at the defect that the conventional carbon nitride photogenerated electrons and holes are easy to recombine, the invention aims to provide a preparation method of a carbon nitride/titanium dioxide embedded heterojunction.
Yet another object of the present invention is to: provides a carbon nitride/titanium dioxide embedded heterojunction product prepared by the method.
Yet another object of the present invention is to: provides an application of the product.
The purpose of the invention is realized by the following scheme: a preparation method of a carbon nitride/titanium dioxide embedded heterojunction photocatalyst is a preparation method of a carbon nitride/titanium dioxide embedded heterojunction photocatalyst by one-step roasting in a mode of mixing a nano titanium dioxide dispersion liquid and a carbon nitride precursor, and comprises the following steps:
1) weighing nano titanium dioxide, a dispersing agent and deionized water according to a formula, firstly adding the dispersing agent into the deionized water, stirring to dissolve the dispersing agent, then adding the nano titanium dioxide, stirring and mixing uniformly, and then grinding in a sand mill to obtain nano titanium dioxide dispersion liquid; the mass ratio of the nano titanium dioxide to the dispersing agent to the deionized water is 1 (0.05-1) to 10-500;
2) adding melamine into the nano titanium dioxide dispersion liquid, wherein the mass ratio of the nano titanium dioxide dispersion liquid to the melamine is 1: 0.05-0.8, and then stirring at 60-100 ℃ until the solution is evaporated to dryness to obtain a uniform mixture of the melamine and the nano titanium dioxide; and grinding the mixture, putting the ground mixture into a crucible with a cover, heating the mixture to 450-600 ℃ in a muffle furnace at a heating rate of 2.5 ℃/min, preserving the heat for 1-7 hours, naturally cooling, centrifuging, washing and drying to obtain the carbon nitride/titanium dioxide embedded heterojunction.
Wherein, the dispersing agent in the step 1) is one or the combination of lauryl sodium sulfate, potassium monododecyl phosphate, nonylphenol polyoxyethylene ether, hexadecyl trimethyl ammonium bromide, monolauryl phosphate, potassium lauryl alcohol ether phosphate and polyvinylpyrrolidone.
Further, in the step 1), the grinding machine rotates at 500-3000 r/min for 1-10 hours.
The mass ratio of the nano titanium dioxide dispersion liquid to the melamine in the step 2) is 1: 0.05-0.8.
The invention provides a carbon nitride/titanium dioxide embedded heterojunction, which is prepared by any one of the methods.
The invention provides an application of a carbon nitride/titanium dioxide embedded heterojunction serving as a catalyst in photocatalytic degradation of formaldehyde.
The preparation method of the carbon nitride/titanium dioxide heterojunction provided by the invention comprises the following steps: accurately weighing nano titanium dioxide, a dispersing agent and deionized water, dissolving the dispersing agent in a proper amount of deionized water, then adding the nano titanium dioxide, uniformly stirring, adding the nano titanium dioxide into a sand mill, and grinding at a certain rotating speed to obtain a monodisperse nano titanium dioxide dispersion liquid. Mixing the carbon nitride/titanium dioxide embedded heterojunction with a proper amount of melamine, stirring at high temperature, evaporating to dryness, roasting the obtained solid substance in a crucible, grinding, centrifuging, washing and drying, and finally directly preparing the carbon nitride/titanium dioxide embedded heterojunction.
The carbon nitride/titanium dioxide heterojunction prepared by the method has the advantages of high separation efficiency of photoproduction electrons and holes, good performance of photocatalytic degradation of formaldehyde, simple operation and lower difficulty, and is suitable for large-scale production.
Drawings
FIG. 1 is a graph showing the formaldehyde decomposition efficiency of a conventional commercial titanium dioxide photocatalyst and samples according to the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The first embodiment is as follows:
a carbon nitride/titanium dioxide embedded heterojunction is prepared by a method for preparing a carbon nitride/titanium dioxide embedded heterojunction photocatalyst by one-step roasting in a mode of mixing a nano titanium dioxide dispersion liquid and a carbon nitride precursor, and comprises the following steps:
1) weighing nano titanium dioxide, a dispersant nonylphenol polyoxyethylene ether and deionized water according to a formula, wherein the mass ratio of the nano titanium dioxide to the dispersant to the deionized water is 1:0.2: 100; firstly, adding a dispersing agent into deionized water, stirring to dissolve the dispersing agent, adding nano titanium dioxide, stirring and mixing uniformly, and then grinding for 5 hours in a sand mill at the rotating speed of 2000 revolutions per minute to obtain nano titanium dioxide dispersion liquid;
2) adding melamine into the nano titanium dioxide dispersion liquid, wherein the mass ratio of the nano titanium dioxide dispersion liquid to the melamine is 1:0.7, and then stirring at 80 ℃ until the solution is evaporated to dryness to obtain a uniform mixture of the melamine and the nano titanium dioxide; and grinding the mixture, putting the ground mixture into a crucible with a cover, heating the mixture to 500 ℃ in a muffle furnace at a heating rate of 2.5 ℃/min, preserving the heat for 3 hours, naturally cooling, centrifuging, washing and drying to obtain the carbon nitride/titanium dioxide embedded heterojunction.
FIG. 1 is a graph showing the formaldehyde decomposition efficiency of a conventional commercial titanium dioxide photocatalyst and samples according to the present invention, and Table 1 shows the formaldehyde decomposition efficiency of a conventional commercial titanium dioxide photocatalyst and samples according to the present invention.
The prepared carbon nitride/titanium dioxide heterojunction has high separation efficiency of photo-generated electrons and holes, good performance of photocatalytic degradation of formaldehyde, and formaldehyde removal rate of more than 94.5 percent, which is shown in figure 1 and table 1.
Example two:
a carbon nitride/titanium dioxide embedded heterojunction is prepared by the following steps similar to the steps of the example 1:
1) accurately weighing nano titanium dioxide, a dispersant potassium lauryl ether phosphate and deionized water according to a formula, enabling the mass ratio of the nano titanium dioxide to the dispersant to the deionized water to be 1:0.2: 200, dissolving the dispersant in the deionized water, then adding the nano titanium dioxide, stirring uniformly, then adding the mixture into a sand mill, and grinding for 5 hours at the rotating speed of 1800 rpm to obtain a monodisperse nano titanium dioxide dispersion liquid;
2) mixing the nano titanium dioxide dispersion liquid with melamine according to the mass ratio of 1:0.5, and then stirring at the temperature of 100 ℃ until the solution is evaporated to dryness to obtain a uniform mixture of melamine and nano titanium dioxide; and grinding the solid mixture, putting the ground solid mixture into a crucible with a cover, heating the mixture to 550 ℃ in a muffle furnace at the heating rate of 2.5 ℃/min, preserving the heat for 5 hours, naturally cooling, centrifuging, washing and drying to obtain the carbon nitride/titanium dioxide embedded heterojunction.
The prepared carbon nitride/titanium dioxide heterojunction has high separation efficiency of photo-generated electrons and holes, good performance of photocatalytic degradation of formaldehyde, and formaldehyde removal rate of more than 93.1%, as shown in figure 1 and table 1.
Example three:
a carbon nitride/titanium dioxide embedded heterojunction is prepared by the following steps similar to the steps of the example 1:
1) accurately weighing the nano titanium dioxide, the dispersant sodium dodecyl sulfate and the deionized water according to the formula, wherein the mass ratio of the nano titanium dioxide to the dispersant to the deionized water is 1:0.3: 500; dissolving a dispersing agent in deionized water, adding nano titanium dioxide, uniformly stirring, adding into a sand mill, and grinding for 1 hour at the rotating speed of 2500 rpm to obtain a monodisperse nano titanium dioxide dispersion liquid;
2) mixing the nano titanium dioxide dispersion liquid with melamine according to the mass ratio of 1:0.3, and then stirring at the temperature of 90 ℃ until the solution is evaporated to dryness to obtain a uniform mixture of melamine and nano titanium dioxide; and grinding the solid mixture, putting the ground solid mixture into a crucible with a cover, heating the mixture to 550 ℃ in a muffle furnace at the heating rate of 2.5 ℃/min, preserving the heat for 7 hours, naturally cooling, centrifuging, washing and drying to obtain the carbon nitride/titanium dioxide embedded heterojunction.
The prepared carbon nitride/titanium dioxide heterojunction has high separation efficiency of photoproduction electrons and holes, good performance of photocatalytic degradation of formaldehyde, and formaldehyde removal rate of more than 96.2 percent, as shown in figure 1 and table 1:
Figure DEST_PATH_IMAGE001

Claims (5)

1. a preparation method of a carbon nitride/titanium dioxide embedded heterojunction is characterized in that the preparation method of the carbon nitride/titanium dioxide embedded heterojunction photocatalyst is prepared by one-step roasting in a mode of mixing a nano titanium dioxide dispersion liquid and a carbon nitride precursor, and comprises the following steps:
1) weighing nano titanium dioxide, a dispersing agent and deionized water according to a formula, firstly adding the dispersing agent into the deionized water, stirring to dissolve the dispersing agent, then adding the nano titanium dioxide, stirring and mixing uniformly, and then grinding in a sand mill to obtain nano titanium dioxide dispersion liquid; the mass ratio of the nano titanium dioxide to the dispersing agent to the deionized water is 1 (0.05-1) to 10-500;
2) adding melamine into the nano titanium dioxide dispersion liquid, wherein the mass ratio of the nano titanium dioxide dispersion liquid to the melamine is 1: 0.05-0.8, and then stirring at 60-100 ℃ until the solution is evaporated to dryness to obtain a uniform mixture of the melamine and the nano titanium dioxide; and grinding the mixture, putting the ground mixture into a crucible with a cover, heating the mixture to 450-600 ℃ in a muffle furnace at a heating rate of 2.5 ℃/min, preserving the heat for 1-7 hours, naturally cooling, centrifuging, washing and drying to obtain the carbon nitride/titanium dioxide embedded heterojunction.
2. The method for preparing a carbon nitride/titanium dioxide embedded heterojunction as claimed in claim 1, wherein in the step 1), the dispersant is one or a combination of sodium dodecyl sulfate, potassium monododecyl phosphate, polyoxyethylene nonylphenol ether, cetyltrimethylammonium bromide, monolauryl phosphate, potassium lauryl ether phosphate and polyvinylpyrrolidone.
3. The method for preparing the carbon nitride/titanium dioxide embedded heterojunction as claimed in claim 1 or 2, wherein in the step 1), the grinding machine is 500-3000 r/min for 1-10 hours.
4. A carbon nitride/titanium dioxide embedded heterojunction, characterized in that it is prepared according to the method of any one of claims 1 to 3.
5. Use of the carbon nitride/titanium dioxide embedded heterojunction as claimed in claim 4 as a catalyst in the photocatalytic degradation of formaldehyde.
CN202011595944.XA 2020-12-29 2020-12-29 Preparation method of carbon nitride/titanium dioxide embedded heterojunction, product and application thereof Pending CN112517047A (en)

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Cited By (3)

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CN113522337A (en) * 2021-07-13 2021-10-22 上海市农业科学院 Preparation method and application method of titanium-based nano material for photocatalytic degradation of DON
CN114471146A (en) * 2022-02-10 2022-05-13 杭州妙蓝环保科技有限公司 Green odorless formaldehyde scavenger and preparation method thereof
CN115141398A (en) * 2022-06-22 2022-10-04 吉翔宝(太仓)离型材料科技发展有限公司 Degradable is from type membrane

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CN113522337A (en) * 2021-07-13 2021-10-22 上海市农业科学院 Preparation method and application method of titanium-based nano material for photocatalytic degradation of DON
CN114471146A (en) * 2022-02-10 2022-05-13 杭州妙蓝环保科技有限公司 Green odorless formaldehyde scavenger and preparation method thereof
CN115141398A (en) * 2022-06-22 2022-10-04 吉翔宝(太仓)离型材料科技发展有限公司 Degradable is from type membrane

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