Synthetic process of bismuth-doped potassium niobate

A synthesis process, the technology of potassium niobate, which is applied in the field of synthesis process of bismuth-doped potassium niobate, can solve the problems of many impurities, uneven crystal form, expensive ethoxide, etc., and achieve lower reaction temperature, high sintering activity, good The effect of applying value

Inactive Publication Date: 2016-07-06
FOSHAN UNIVERSITY
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the exploratory research, although the solid-phase synthesis in the synthesis method of niobate is simple, the prepared particles have a large particle size, and the crystal form is not uniform, and there are many impurities, which are obviously detrimental to its photocatalytic activity.
The sol-gel method is feasible, but the ethoxides of niobium and tantalum are too expensive and the cost is too high

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
  • Synthetic process of bismuth-doped potassium niobate
  • Synthetic process of bismuth-doped potassium niobate
  • Synthetic process of bismuth-doped potassium niobate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 0.2000g analytically pure Nb 2 o 5 Add 0.3604g of analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 240°C for 24 hours to obtain monoclinic Structural K 4 Nb 6 o 17 niobate with a lattice constant of This complies with the standard card JCPDS76-0977. After the reaction, the reaction kettle was taken out, naturally cooled to room temperature, the lid of the kettle was opened, the product was taken out, filtered, washed several times with deionized water and absolute ethanol, and dried under normal pressure at 60°C to obtain potassium niobate.

Embodiment 2

[0026] 0.2000g analytically pure Nb 2 o 5 Add 0.7723g of analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 240°C for 24 hours to obtain monoclinic Structural K 4 Nb 6 o 17 niobate with a lattice constant of This complies with the standard card JCPDS76-0977. After the reaction, the reaction kettle was taken out, naturally cooled to room temperature, the lid of the kettle was opened, the product was taken out, filtered, washed several times with deionized water and absolute ethanol, and dried under normal pressure at 60°C to obtain potassium niobate.

Embodiment 3

[0028] 0.2000g analytically pure Nb 2 o 5 Add 2.0594g of analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven at 240°C for 24 hours to obtain monoclinic Structural K 4 Nb 6 o 17 niobate with a lattice constant of This complies with the standard card JCPDS76-0977. After the reaction, the reaction kettle was taken out, naturally cooled to room temperature, the lid of the kettle was opened, the product was taken out, filtered, washed several times with deionized water and absolute ethanol, and dried under normal pressure at 60°C to obtain potassium niobate.

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 synthesis process method of bismuth-doped potassium niobate, comprising the following steps: analyzing pure Nb 2 o 5 Add analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven to react for a certain period of time; after the reaction, take out the reaction kettle and let it cool naturally to room temperature, open the lid of the kettle, take out the product and filter, wash with deionized water and absolute ethanol several times, and obtain potassium niobate after drying under normal pressure at 60°C; take Nb 2 o 5 0.2g, KOH0.36g, Bi(NO 3 )·5H 2 O, according to the molar ratio of Bi / Nb is 0.25%, 0.5%, 0.75%, 1%, and 5% added in different proportions, at 240 ° C, hydrothermal reaction for 24 hours, the obtained samples of potassium niobate doped with Bi are all Appears as white powder. The invention develops a doped modified niobate nano-catalyst with catalytic activity under sunlight through the modification treatment of metal bismuth functional components doped with potassium niobate.

Description

technical field [0001] The invention relates to semiconductor heterogeneous photocatalytic oxidation technology, in particular to a synthesis process method of bismuth-doped potassium niobate. Background technique [0002] The key to photocatalytic research is to develop highly efficient photocatalysts. As a new photocatalytic material, perovskite-type niobium (tantalum) salt compounds have become the most popular photocatalysts due to their controllable composition and structure, good thermal stability, and low price. However, niobium (tantalum) salt compounds have their own limitations, such as low catalytic activity, especially high band gap energy, and cannot efficiently absorb the abundant visible light in the solar spectrum, which limits the promotion of this technology. Although it has been reported in the literature that the absorption spectrum of niobium (tantalum) salt compounds can be red-shifted by modifying them with metal or non-metal doping alone, the current...

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 Patents(China)
IPC IPC(8): B01J23/20
Inventor 蔡河山黎晓霞孙明兰永红
Owner FOSHAN UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap