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Carbon nitride/lanthanum hydroxide nanofiber membrane as well as preparation method and application thereof

A nanofiber membrane and lanthanum hydroxide technology, which is applied in the field of photocatalytic materials, can solve the problems of low utilization rate of visible light, easy reunion of carbon nitride, cumbersome post-processing, etc., to alleviate the crisis of non-renewable energy, prevent reunion, and improve photocatalysis. The effect of catalytic activity

Active Publication Date: 2020-12-15
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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  • Carbon nitride/lanthanum hydroxide nanofiber membrane as well as preparation method and application thereof
  • Carbon nitride/lanthanum hydroxide nanofiber membrane as well as preparation method and application thereof
  • Carbon nitride/lanthanum hydroxide nanofiber membrane as well as preparation method and application thereof

Examples

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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 as well as a preparation method and application thereof. Nanofiber loading and lanthanum electron-deficient orbital characteristics are combined, an electrostatic spinning nanofiber membrane serves as a support to load carbon nitride, the agglomeration of the carbon nitride is prevented, the specific surface area thereof is increased, lanthanum hydroxide grows on a carbon nitride sheet layer in situ, and by means of the unique electron-deficient orbital structure of the lanthanum hydroxide, the separation of carbonnitride photo-induced electrons and holes is promoted, so that the photocatalytic activity is improved. In the prepared carbon nitride / lanthanum hydroxide nanofiber membrane, the carbon nitride and the lanthanum hydroxide are wrapped in nanofibers, and lanthanum hydroxide nanosheets grow on a carbon nitride sheet layer in situ. The prepared carbon nitride / lanthanum hydroxide nanofiber membrane canbe used for catalytically degrading dyes and catalytically producing hydrogen under visible light. The problems that carbon nitride is prone to agglomeration, aftertreatment is tedious, and the visible light utilization rate is low are solved.

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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IPC IPC(8): B01J31/06C01B3/02C01B15/01C02F1/30C02F101/30
CPCB01J31/069C02F1/30C01B3/02C01B15/01C02F2101/308C02F2305/10B01J35/39
Inventor 卢灿辉张伟敖成鸿
Owner SICHUAN UNIV
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