Check patentability & draft patents in minutes with Patsnap Eureka AI!

Preparation method and application of zinc oxide quantum dot-potassium niobate photocatalyst

A photocatalyst and quantum dot technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, carbon dioxide reduction method preparation, physical/chemical process catalyst, etc., can solve the problems of low visible light activity and reduced catalytic activity of the catalyst, Achieve the effects of simple operation, high yield, and cheap raw materials

Inactive Publication Date: 2017-09-12
TIANJIN UNIVERSITY OF TECHNOLOGY
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rapid recombination of photogenerated electrons and holes in the photocatalytic reaction leads to the reduction of catalytic activity and the low visible light activity of the catalyst cannot be ignored.
Although domestic and foreign researchers have effectively improved the reactivity of photocatalysis and the utilization rate of light energy by depositing precious metals on the surface of semiconductor catalysts, compounding with narrow-bandgap semiconductor catalysts, doping ions, and dye sensitization, etc. still can not solve the fundamental problem of photocatalysis

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
  • Preparation method and application of zinc oxide quantum dot-potassium niobate photocatalyst
  • Preparation method and application of zinc oxide quantum dot-potassium niobate photocatalyst
  • Preparation method and application of zinc oxide quantum dot-potassium niobate photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Zinc oxide quantum dots were synthesized by a solvothermal method, and the specific experimental steps were as follows:

[0035] (1) Weigh 1.387g (0.01mol) of zinc chloride and dissolve it in 100mL of triethylene glycol.

[0036] (2) Weigh 0.8g (0.02mol) of sodium hydroxide and dissolve it in 100mL of triethylene glycol.

[0037] (3) Put the above two solutions into an ultrasonic instrument and sonicate for 1 hour.

[0038] (4) Put the two sonicated solutions into a 250mL three-necked flask, heat the oil bath at 90°C for 3h under magnetic stirring at 500rpm, and then raise the temperature to 120°C for 1h.

[0039] (5), take out the well-reacted solution from the oil bath, after cooling to room temperature.

[0040] (6), wash with absolute ethanol and deionized water 3 times to obtain a pale yellow product.

[0041] (7) Put the product into an air blast drying oven at 80° C., and dry it at a constant temperature for 12 hours.

[0042] (8) Put the dried product into a...

Embodiment 2

[0044] Preparation of flaky KNb by secondary hydrothermal method 3 o 8 catalyst:

[0045] (1) Weigh 6.72g of potassium hydroxide (KOH) and dissolve it in 30mL of deionized water, and magnetically stir until it becomes a transparent and colorless solution.

[0046] (2), then weigh 0.442g of niobium pentoxide (Nb 2 o 5 ) was added to the above colorless solution, and magnetic stirring was continued for 30 min.

[0047] (3) Transfer the above white turbid liquid to a 75mL polytetrafluoroethylene reaction kettle, and conduct a hydrothermal reaction at 180°C for 48h.

[0048] (4) After the reaction is finished, take out the reactor and cool to room temperature to obtain a clear solution.

[0049] (5) Take the above solution into a 100mL beaker, put it into a constant temperature condensed water area at a constant temperature of 25°C, slowly add hydrochloric acid dropwise under magnetic stirring, and adjust the pH of the reaction system to 5-6.

[0050] (6) With the addition o...

Embodiment 3

[0056] Preparation of ZnO—KNb by hydrothermal method 3 o 8 catalyst:

[0057] (1) Weigh 6.72g of potassium hydroxide (KOH) and dissolve it in 30mL of deionized water, and magnetically stir until it becomes a transparent and colorless solution.

[0058](2), then weigh 0.442g of niobium pentoxide (Nb 2 o 5 ) was added to the above colorless solution, and magnetic stirring was continued for 30 min.

[0059] (3) Transfer the above white turbid liquid to a 75mL polytetrafluoroethylene reaction kettle, and conduct a hydrothermal reaction at 180°C for 48h.

[0060] (4) After the reaction is finished, take out the reactor and cool to room temperature to obtain a clear solution.

[0061] (5) Take the above solution into a 100mL beaker, put it into a constant temperature condensed water area at a constant temperature of 25°C, slowly add hydrochloric acid dropwise under magnetic stirring, and adjust the pH of the reaction system to 5-6.

[0062] (6) With the addition of hydrochlori...

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 discloses a preparation method and application of a zinc oxide quantum dot-potassium niobate photocatalyst; the preparation method comprises: using zinc chloride, sodium hydroxide and triethylene glycol as raw materials to prepare zinc oxide quantum dots via a solvothermal process, and using potassium hydroxide, niobium pentoxide and hydrochloric acid as raw materials to prepare flaky potassium niobate via a double hydrothermal process, and supporting the zinc oxide quantum dots. The materials used herein are low in price and easy to obtain, the preparation method is simple to perform, and high yield can be achieved by applying the prepared photocatalyst to the preparation of methanol from isopropanol solution via CO2 photocatalytic reduction.

Description

technical field [0001] The invention relates to the preparation of a novel photocatalyst, which is used in the field of photocatalytic reduction of carbon dioxide. Background technique [0002] Today, the massive combustion of fossil fuels such as oil, coal, and natural gas has resulted in atmospheric CO 2 The sharp increase in the concentration of the pollutants will cause the greenhouse effect and seriously affect the survival and development of human beings. How to reduce and utilize CO in a timely and effective manner 2 imminent. Photocatalysis is to imitate the photosynthesis of plants in nature, and convert CO 2 Conversion into organic matter, not only the comprehensive utilization of CO 2 , to truly realize the carbon cycle, and at the same time alleviate the problem of global resource shortage, which is of great significance. [0003] The rapid recombination of photogenerated electrons and holes in the photocatalytic reaction leads to the reduction of catalytic ...

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): B01J23/20B01J23/06C07C29/15C07C31/04
CPCC07C29/15B01J23/06B01J23/20B01J35/39C07C31/04Y02P20/52
Inventor 尹晓红邵啸张泷方
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com