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One-step preparation of carbon nitride/titanium dioxide heterojunction photocatalyst by electrospinning

A titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of poor photocatalytic performance, small specific surface area, complicated methods, etc., and achieve low cost and process. Simple, easy-to-use effects

Active Publication Date: 2020-01-10
湖北省亨德利医疗器械有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Carbon nitride is a non-metallic photocatalyst with strong visible light absorption, but the specific surface area is small, and the photogenerated electron holes are easy to recombine, so the photocatalytic performance is poor
Titanium dioxide is one of the common semiconductor materials. It has good photoelectric performance, photocatalytic performance, good chemical stability, and non-toxicity. Photoexcitation, it does not respond to visible light, which accounts for about 50% of sunlight, and photogenerated electrons and holes are easy to recombine. Therefore, it is necessary to find a simple way to combine two semiconductor materials to prepare carbon nitride / titanium dioxide heterogeneous Junction photocatalysts to improve the utilization rate of sunlight, increase the specific surface area of ​​heterojunction photocatalysts, effectively inhibit the recombination of electrons and holes, thus greatly improving the photocatalytic performance of heterojunctions
Existing electrospinning methods for preparing carbon nitride / titanium dioxide heterojunction photocatalysts are complex and time-consuming
In addition, there is no report on the method of directly adding melamine, guanidine hydrochloride or urea to the spinning solution and calcining the carbon nitride / titanium dioxide heterojunction photocatalyst using the one-step electrospinning method.

Method used

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  • One-step preparation of carbon nitride/titanium dioxide heterojunction photocatalyst by electrospinning
  • One-step preparation of carbon nitride/titanium dioxide heterojunction photocatalyst by electrospinning
  • One-step preparation of carbon nitride/titanium dioxide heterojunction photocatalyst by electrospinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Grind 0.3g of melamine for 6min, add it to a conical flask, then add 8ml of methanol, ultrasonicate at 200w for 5min, then add 0.3ml of glacial acetic acid, 2ml of tetrabutyl titanate and 0.52g of polyvinylpyrrolidone, stir magnetically for 2h to obtain a uniform Spinning solution; the spinning solution is packed into a plastic syringe with a stainless steel needle for high-voltage electrospinning, the spinning voltage is 12kV; the distance between the needle tip and the receiving plate is 14cm; the air humidity is 40%; melamine / tetrabutyl titanate is obtained The ester / polyvinylpyrrolidone fiber membrane was transferred into a muffle furnace and calcined at 5°C / min and 520°C for 2h to obtain a carbon nitride / titanium dioxide heterojunction photocatalyst.

Embodiment 2

[0027] Grind 0.8 g of melamine for 7 minutes, add it to the Erlenmeyer flask, then add 9ml of methanol, ultrasonicate at 200w for 5 minutes, then add 0.4ml of glacial acetic acid, 2ml of tetrabutyl titanate and 0.6g of polyvinylpyrrolidone, stir magnetically for 2.5h to obtain a uniform Spinning solution; put the spinning solution into a plastic syringe with a stainless steel needle for high-voltage electrospinning, the spinning voltage is 14kV; the distance between the needle tip and the receiving plate is 14cm; the air humidity is 38%; The butyl ester / polyvinylpyrrolidone fiber membrane was transferred into a muffle furnace, and calcined at 4°C / min and 510°C for 2h to obtain a carbon nitride / titanium dioxide heterojunction photocatalyst.

Embodiment 3

[0029] Grind 0.6 g of guanidine hydrochloride for 5 min, add it to a conical flask, add 8 ml of methanol, ultrasonicate at 250w for 4 min, then add 0.3 ml of glacial acetic acid, 2.5 ml of tetrabutyl titanate and 0.8 g of polyvinylpyrrolidone, and stir magnetically for 2.5 h Obtain uniform spinning solution; The spinning solution is packed into a plastic syringe with a stainless steel needle to carry out high-voltage electrospinning, and the spinning voltage is 15kV; the distance between the needle tip and the receiving plate is 14cm; air humidity 35%; obtain guanidine hydrochloride / The tetrabutyl titanate / polyvinylpyrrolidone fiber membrane was transferred into a muffle furnace, and calcined at 5°C / min and 520°C for 2h to obtain a carbon nitride / titanium dioxide heterojunction photocatalyst.

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Abstract

The invention belongs to the technical field of photocatalysts for organic sewage degradation, and particularly relates to a method for preparing carbon nitride / titanium dioxide heterojunction photocatalysts by one-step electrospinning. The heterojunction photocatalyst is prepared by a one-step electrospinning method. Specifically, melamine or guanidine hydrochloride or urea is added to a mixed solution containing glacial acetic acid, tetrabutyl titanate, polyvinylpyrrolidone and an organic solvent, and electrospinning is performed. The carbon nitride / titanium dioxide heterojunction photocatalyst is prepared by the process and high temperature calcination treatment. The prepared photocatalyst has a good heterostructure and excellent photocatalytic degradation performance of organic sewage, which simplifies the preparation process of carbon nitride / titanium dioxide heterojunction photocatalyst, and the process is simple and time-saving. It has better application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts for organic sewage degradation, and in particular relates to a method for preparing carbon nitride / titanium dioxide heterojunction photocatalysts by one-step electrospinning. Background technique [0002] Heterojunction photocatalysts have improved photocatalytic effect, which can improve the utilization rate of solar energy and have been widely studied, and are applied in organic sewage treatment and comprehensive utilization of solar energy. Carbon nitride is a non-metallic photocatalyst with strong visible light absorption, but its specific surface area is small, and photogenerated electrons and holes are easy to recombine, so its photocatalytic performance is poor. Titanium dioxide is one of the common semiconductor materials. It has good photoelectric performance, photocatalytic performance, good chemical stability, and non-toxicity. Photoexcitation, it does not respond to visible lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/06B01J37/34B01J37/08C02F1/30C02F101/38
CPCB01J27/24B01J35/004B01J35/06B01J37/082B01J37/342C02F1/30C02F2101/38C02F2305/10Y02W10/37
Inventor 闫俊涛王春蕾李建芬范国枝
Owner 湖北省亨德利医疗器械有限公司
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