Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing carbon nitride/ titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way

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: 2017-12-12
WUHAN POLYTECHNIC UNIVERSITY
View PDF6 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing carbon nitride/ titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way
  • Method for preparing carbon nitride/ titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way
  • Method for preparing carbon nitride/ titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of photocatalysts for degrading organic sewage, and specifically relates to a method for preparing a carbon nitride / titanium dioxide heterojunction photocatalyst in one-step electrostatic spinning way. The heterojunction photocatalyst is prepared in the one-step electrostatic spinning way, wherein the one-step electrostatic spinning way specifically comprises the following steps: adding melamine or guanidine hydrochloride or urea to a mixed solution containing glacial acetic acid, tetrabutyl titanate, polyvinylpyrrolidone and an organic solvent; then performing the electrostatic spinning technology and the high-temperature sintering treatment to obtain the carbon nitride / titanium dioxide heterojunction photocatalyst. The prepared photocatalyst is outstanding in heterojunction and outstanding in performance of photocatalyzing degrading the organic sewage; the preparation technology of the carbon nitride / titanium dioxide heterojunction photocatalyst is simplified; the technology is simple; the time is saved. Therefore, the method has a good application prospect in organic sewage treatment.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J27/24B01J35/06B01J37/34B01J37/08C02F1/30C02F101/38
CPCC02F1/30B01J27/24B01J37/082B01J37/342C02F2305/10C02F2101/38B01J35/58B01J35/39Y02W10/37
Inventor 闫俊涛王春蕾李建芬范国枝
Owner WUHAN POLYTECHNIC UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com