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

Composite photocatalytic system CQDS-KNbO3, preparation method and application thereof

A photocatalytic and composite technology, applied in the field of photocatalysis, can solve the problems of large band gap, high probability of recombination of holes and photogenerated electrons, inability to effectively use the visible part of sunlight, etc., and achieve strong redox Effect

Active Publication Date: 2017-06-30
LIAONING UNIVERSITY
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, KNbO 3 As a photocatalytic degradation material for hydrogen production, it has certain disadvantages
KbO 3 It has a wide bandgap (3.3eV) and a large forbidden band width, which cannot effectively use the visible light part of sunlight, and the light utilization rate is low
Also, KNbO 3 The probability of recombination of holes and photogenerated electrons is relatively high, which makes the utilization efficiency of photogenerated carriers low

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
  • Composite photocatalytic system CQDS-KNbO3, preparation method and application thereof
  • Composite photocatalytic system CQDS-KNbO3, preparation method and application thereof
  • Composite photocatalytic system CQDS-KNbO3, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 Composite photocatalytic system CQD S -KNbO 3

[0014] 1. KNbO 3 Preparation of granules:

[0015] Preparation of KNbO by Hydrothermal Method 3 particles. 3.57g Nb 2 o 5 The powder and 37.69 g of KOH flake solid were added to a beaker with 19 ml of deionized water and stirred on a magnetic stirrer for 30 min until Nb 2 o 5 Mix well with KOH and dissolve all. Then the mixture was sealed in a polytetrafluoroethylene-lined stainless steel autoclave and heated at 160 °C for 12 h. Cool to room temperature. The product was ground into granular form, put into a muffle furnace for calcination, the calcination temperature was 400° C., and the calcination time was 1 h. Cool to room temperature and grind to get KNbO 3 particles.

[0016] 2. Preparation of carbon quantum dots CQDs:

[0017] Preparation of CQDs by Hydrothermal Method S . Add 1.6 g of ascorbic acid, 15 ml of ethylene glycol and 25 ml of deionized water into the beaker and stir for 30 minutes...

Embodiment 2

[0020] Example 2 Composite photocatalytic system CQD S -KNbO 3 Catalytic degradation of crystal violet under visible light

[0021] (1) Effect of light time on photocatalytic degradation of crystal violet

[0022] Visible light catalytic degradation: take 50.0mL 10.0mg / L crystal violet solution in a 100mL Erlenmeyer flask, add the CQD prepared in Example 1 S -KNbO 3 50.0mg, irradiated under visible light for 1.0~5.0h. Filter and measure its UV spectrum at 200-800nm. Take the absorbance at 582nm to calculate the degradation rate of crystal violet.

[0023] Degradation rate (%) = (C 0 –C) / C 0 ×100% (where C 0 : the concentration of the stock solution; C: the concentration of the sample). The results are shown in Table 1.

[0024] Table 1 Composite photocatalytic system CQD S -KNbO 3 Visible light photocatalytic degradation of crystal violet

[0025]

[0026] As shown in Table 1, with the prolongation of the illumination time, the degradation rates of catalysts C / K...

Embodiment 3

[0032] Example 3 Composite photocatalytic system CQD S -KNbO 3 Photocatalytic hydrogen production using crystal violet as a sacrificial agent

[0033] (1) Effect of light time on photocatalytic hydrogen production with crystal violet as sacrificial agent

[0034] Method: Measure 500mL of 50.0mg / L crystal violet solution into a photocatalytic hydrogen production reactor, add 200.0mg of the catalyst prepared in Example 1, and irradiate under visible light for 1.0-5.0h. Gas chromatography was used to measure the amount of hydrogen generated during the reaction. The results are shown in Table 3.

[0035] Table 3 Composite system CQD S -KNbO 3 Visible light photocatalytic hydrogen production

[0036]

[0037] As shown in Table 3, the hydrogen production of catalysts C / K 0, C / K 0.5, C / K 1.0, and C / K 1.5 all increased with the increase of CQDs concentration with the prolongation of light time. When the C / K is 1.5 and the light time is 5.0h, the amount of hydrogen produced r...

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

No PUM Login to View More

Abstract

The invention relates to a composite photocatalytic system CQDS-KNbO3, a preparation method and application thereof. The preparation method includes the following steps: dissolving CQDS (carbon quantum dots) in deionized water; adding KNbO3 into CQDS water solution; stirring the solution for 1 hour and drying the solution at the temperature of 80 DEG C to obtain the composite photocatalytic system CQDS-KNbO3. The composite photocatalytic system CQDS-KNbO3 with strong oxidation-reduction activity can produce hydrogen while degrading an organic pollutant under visible light radiation, the pollutant is regarded as a resource, and clean energy is generated while environment management is realized.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a composite photocatalytic system CQD S -KNbO 3 Preparation and application in photocatalytic degradation of organic pollutants and simultaneous hydrogen production under visible light irradiation. Background technique [0002] Environmental pollution has evolved into a serious problem that human beings must face in the process of social development. In the dye industry, some azo dyes are produced. Due to their stable structure, high toxicity and electron-withdrawing groups, they are difficult to degrade. Such refractory pollutants will exist in the environment for a long time, causing great harm to the ecological environment and human health. However, it is also a waste of resources to degrade such refractory pollutants without utilizing them. So an economically reasonable solution should be proposed to solve this problem. In fact, refractory pollutants can be used as an avail...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20C01B3/02C02F1/30C02F101/38
CPCC01B3/02C02F1/30B01J23/20C02F2101/38B01J35/39Y02P20/10
Inventor 张朝红屈泽鹏刘逸伦纪剑峰王君宋有涛孙意忱
Owner LIAONING 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