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A carbon nitride/lanthanum hydroxide nanofiber membrane and its preparation method and application

A technology of nanofiber membrane and lanthanum hydroxide, which is applied in the field of photocatalytic materials, can solve the problems of easy agglomeration of carbon nitride, low utilization rate of visible light, and cumbersome post-processing.

Active Publication Date: 2021-09-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the prior art, to provide a carbon nitride / lanthanum hydroxide nanofiber membrane and its preparation method and application, to solve the problems of easy agglomeration of carbon nitride, cumbersome post-processing, and low utilization rate of visible light, etc. Obtaining a carbon nitride / lanthanum hydroxide nanofibrous membrane with high visible-light photocatalytic activity and easy recycling

Method used

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  • A carbon nitride/lanthanum hydroxide nanofiber membrane and its preparation method and application
  • A carbon nitride/lanthanum hydroxide nanofiber membrane and its preparation method and application
  • A carbon nitride/lanthanum hydroxide nanofiber membrane and its preparation method and application

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Effect test

Embodiment 1

[0038] Preparation of carbon nitride / lanthanum hydroxide nanofiber membrane (with cotton fiber as substrate):

[0039] (1) Preparation of carbon nitride: put a certain amount of urea in a crucible with a cover, raise the temperature to 550°C at a heating rate of 2°C / min, heat cure and peel in air for 4h, and obtain yellow carbon nitride powder.

[0040] (2) Preparation of spinning solution: Soak cotton in water, methanol and dimethylacetamide successively for 1 hour activation respectively, then filter the activation solution by suction filtration, fully dissolve the polymer matrix after suction filtration in DMAC / In the LiCl (mixed solvent of mass ratio 92:8) solvent system, obtain the cellulose spinning solution that mass concentration is 1%; Add the carbon nitride of cotton quality 10% and spinning solution quality 0.5 in the cellulose spinning solution % lanthanum chloride, fully stirred at room temperature for 12h and mixed evenly.

[0041](3) One-step preparation of ca...

Embodiment 2

[0052] Preparation of carbon nitride / lanthanum hydroxide nanofiber membrane (based on chitosan):

[0053] (1) Preparation of carbon nitride: put a certain amount of urea in a crucible with a cover, raise the temperature to 550°C at a heating rate of 2°C / min, heat cure and peel in air for 4h, and obtain yellow carbon nitride powder.

[0054] (2) Configuration of spinning solution: soak the chitosan matrix in water, methanol, and dimethylacetamide successively for 1.5 hours to activate respectively, then suction filter, and fully dissolve the polymer matrix after the suction filtration in DMAC / In LiCl (mass ratio 92:8) solvent system, obtain the chitosan spinning solution of mass concentration 1%; Add the carbon nitride of chitosan quality 20% and spinning solution quality 1% in chitosan spinning solution % lanthanum sulfate, fully stirred at room temperature for 12h and mixed evenly.

[0055] (3) One-step preparation of carbon nitride / lanthanum hydroxide nanofiber membrane: p...

Embodiment 3

[0057] Preparation of carbon nitride / lanthanum hydroxide nanofiber membrane (using polyvinyl alcohol as the base material):

[0058] (1) Preparation of carbon nitride: put a certain amount of melamine in a crucible with a cover, heat up to 550°C at a heating rate of 2°C / min, and heat-cure and peel in air for 4 hours to obtain yellow carbon nitride powder.

[0059] (2) Configuration of spinning solution: The hydrogen bonds between polyvinyl alcohols are weak, and the activation process can be ignored. Directly dissolve polyethylene in isopropanol / water (7 / 3, v / v) solvent system to obtain the mass concentration It is a 1.5% polyvinyl alcohol solution; add 30% of the mass of polyvinyl alcohol, 1% of the mass of carbon nitride spinning solution, and 1% of lanthanum nitrate to the polyvinyl alcohol spinning solution, and stir well at room temperature for 12 hours to mix evenly.

[0060] (3) One-step preparation of carbon nitride / lanthanum hydroxide nanofiber membrane: put the chito...

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Abstract

The invention provides a carbon nitride / lanthanum hydroxide nanofiber membrane, a preparation method and application thereof. Combining nanofiber loading and the characteristics of lanthanum electron-deficient orbitals, electrospun nanofiber membranes are used as scaffolds to load carbon nitride to prevent carbon nitride agglomeration, increase its specific surface area, and grow hydrogen in situ on carbon nitride sheets Lanthanum oxide, using the unique electron-deficient orbital structure of lanthanum hydroxide, promotes the separation of photogenerated electrons and holes in carbon nitride, thereby improving the photocatalytic activity. In the prepared carbon nitride / lanthanum hydroxide nanofiber membrane, carbon nitride and lanthanum hydroxide are wrapped in nanofibers, and lanthanum hydroxide nanosheets are grown on the carbon nitride sheet in situ. The prepared carbon nitride / lanthanum hydroxide nanofiber membrane can be used for catalytic degradation of dyes and catalytic hydrogen production under visible light. The invention solves the problems of easy agglomeration of carbon nitride, cumbersome post-treatment, low utilization rate of visible light and the like.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and in particular relates to a visible light responsive catalytic film and a preparation method thereof. Background technique [0002] Graphite carbon nitride has been widely used in the fields of visible light catalytic degradation, hydrogen production by hydrolysis, nitrogen fixation, and carbon dioxide reduction due to its simple preparation method, low preparation cost, good chemical stability, and visible light response activity. However, most graphite-phase carbon nitrides are in the form of powders, which are easy to agglomerate during use and difficult to collect after use. They need to be treated by centrifugation before they can be used again, which is not conducive to recycling. In addition, graphitic carbon nitride has low catalytic activity under visible light due to the easy recombination of holes and electrons. Improving the separation of holes and charges is an effective m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06C01B3/02C01B15/01C02F1/30C02F101/30
CPCB01J31/069B01J35/004C01B3/02C01B15/01C02F1/30C02F2101/308C02F2305/10
Inventor 张伟卢灿辉敖成鸿
Owner SICHUAN UNIV
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