Carbon nitride photocatalytic material doped with heterogeneous elements and its preparation method and application

A technology of heterogeneous elements and catalytic materials, applied in chemical instruments and methods, physical/chemical process catalysts, non-metallic elements, etc., to achieve the effects of increasing porosity, simplifying the process, and improving performance

Active Publication Date: 2021-01-12
德州新动能铁塔发电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Again for example CN107008496A discloses a kind of preparation method of lipophilic modified graphite phase carbon nitride, after graphite phase carbon nitride is mixed with organic modifier, add ultrasonic in glacial acetic acid, then transfer to hydrothermal kettle for water heating Thermal reaction, finally the sample is washed to neutral, and dried to obtain modified graphite phase carbon nitride. This method is simple to prepare, but only organically modifies the material to improve the solubility of carbon nitride materials in organic solvents.

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  • Carbon nitride photocatalytic material doped with heterogeneous elements and its preparation method and application
  • Carbon nitride photocatalytic material doped with heterogeneous elements and its preparation method and application
  • Carbon nitride photocatalytic material doped with heterogeneous elements and its preparation method and application

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[0031] The first aspect of the present invention provides a method for preparing a carbon nitride photocatalytic material doped with heterogeneous elements, comprising the following steps:

[0032] (1) reacting the graphite-phase carbon nitride precursor and the plant extract in a solution to obtain a gel material, wherein the plant extract is a mixture containing phosphorus-containing compounds and inositol extracted from plants;

[0033] (2) Calcining the gel material by temperature programming under the protection of an inert gas to prepare a carbon nitride photocatalytic material doped with heterogeneous elements.

[0034] step 1)

[0035] Specifically, the graphitic carbon nitride precursor in step (1) of the present invention is generally a C-rich and N-rich compound, examples of which include but are not limited to melamine, dicyandiamide, cyanamide, thiourea and urea. The plant extract of the present invention is a mixture obtained by extracting plants as raw materi...

Embodiment 1

[0044] This embodiment is an exemplary extraction and detection process of plant extracts used in the preparation process of heterogeneous element-doped carbon nitride photocatalytic materials. The specific steps are as follows:

[0045] a. use sodium sulfate and acetic acid solution to soak the selected rapeseed meal to obtain the soaking liquid, and use a pH meter to adjust the pH value of the solution at 2.5;

[0046] b. filter the resulting soaking solution, then neutralize it with a 10% sodium hydroxide solution to obtain a neutralizing solution, and use a pH meter to adjust the pH value of the solution to 7.5;

[0047] c. Filtrating the neutralization solution to obtain a precipitate, and performing secondary acidification of the obtained precipitate with 1 mol / l hydrochloric acid, and using a pH meter to adjust the pH value of the solution to 1.5 to obtain a plant extract.

Embodiment 2

[0049] This embodiment is another exemplary extraction and detection process of the plant extract used in the preparation process of the heterogeneous element-doped carbon nitride photocatalytic material. The specific steps are as follows:

[0050] a. use sodium sulfate and acetic acid solution to soak the selected rapeseed meal to obtain the soaking liquid, and use a pH meter to adjust the pH value of the solution at 2.5;

[0051] b. filter the resulting soaking solution, then neutralize it with a solution containing 10% sodium hydroxide and 5% ammonium sulfate to obtain a neutralizing solution, and use a pH meter to adjust the pH value of the solution to 7.5;

[0052] c. Filtrating the neutralization solution to obtain a precipitate, and performing secondary acidification of the obtained precipitate with 1 mol / l hydrochloric acid, and using a pH meter to adjust the pH value of the solution to 1.5 to obtain a plant extract.

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Abstract

The invention discloses a heterogeneous element doping carbon nitride photocatalytic material, as well as a preparation method and application thereof. The preparation method of the heterogeneous element doping carbon nitride photocatalytic material comprises the steps of (1) reacting a graphite-phase carbon nitride precursor with a plant extract in a solution so as to obtain a hydrogel material,wherein the plant extract is a mixture obtained through extraction by adopting plants as raw materials and containing a phosphorous compound and inositol; and freeze-drying the hydrogel material so asto obtain an aerogel material; and (2) under the inert gas shielding, roasting the aerogel material through temperature programming, and obtaining the heterogeneous element doping carbon nitride photocatalytic material. According to the heterogeneous element doping carbon nitride photocatalytic material, as well as the preparation method and the application thereof provided by the invention, by utilizing static electricity and hydrogen-bond interaction between the plant extract and the graphite-phase carbon nitride precursor, materials are orderly arranged and assembled, so that a photocatalytic performance is improved; and in addition, an applied phosphorus source has no any toxic or side effects, so that the product purity is high, the process flow is simple, the hydrogen production speed is high, and the heterogeneous element doping carbon nitride photocatalytic material is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a carbon nitride photocatalytic material doped with heterogeneous elements and a preparation method and application thereof. Background technique [0002] In the graphitic phase carbon nitride (g-C 3 N 4 ) catalysts, g-C with a stable layered structure similar to graphene 3 N 4 Widely used in the field of heterogeneous catalysis, its band gap and semiconductor band edge position can meet the thermodynamic requirements of photocatalytic conversion. Compared with other photocatalysts, its advantages are very prominent: good thermal and chemical stability, The source is abundant and the preparation process is simple. g-C 3 N 4 The structure determines that it has a wide range of applications. Currently, g-C 3 N 4 Mainly used in photo-splitting water to produce hydrogen and photocatalytic reduction of CO 2 , photocatalytic pollutant degradation and sterilization, etc., but it faces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042Y02E60/36
Inventor 张丁朱玉坤石爱民陈筱林
Owner 德州新动能铁塔发电有限公司
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