Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing tungstate with visible-light photocatalytic activity by microwave hydrothermal process

A microwave hydrothermal method and photocatalytic activity technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of low utilization of sunlight, and achieve low reaction temperature and good visible light The effect of response and pollution control

Active Publication Date: 2014-12-24
盐城市鹤业实业投资有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The band gap is large, and it can only absorb ultraviolet light with a wavelength less than 387nm, and the utilization rate of sunlight is very 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
  • Method for preparing tungstate with visible-light photocatalytic activity by microwave hydrothermal process
  • Method for preparing tungstate with visible-light photocatalytic activity by microwave hydrothermal process
  • Method for preparing tungstate with visible-light photocatalytic activity by microwave hydrothermal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and NaN 3 Put into the beaker, add 60ml deionized water in the beaker, obtain mixed liquor, wherein Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NaN 3 The amount added is R N =1,R N is NaN 3 The molar ratio of N atoms and Bi atoms in

[0026] Step 2: After magnetically stirring the mixed solution obtained in Step 1, add the activator NH 4 Cl, and the reducing agent N was added dropwise 2 h 4 ·H 2 O, to adjust pH=7, and control NH 4 Cl and N 2 h 4 ·H 2 O follow with NaN 3 The molar ratio of 1:1:3 was added, and then stirred at room temperature for one hour, so that it was fully mixed to obtain a precursor solution for microwave hydrothermal reaction;

[0027] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, and use N 2 Seal the kettle, then put the reaction kettle into the microwave hydrothermal rea...

Embodiment 2

[0030] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H2 O and NaN 3 Put into the beaker, add 60ml deionized water in the beaker, obtain mixed liquor, wherein Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NaN 3 The amount added is R N =2,R N is NaN 3 The molar ratio of N atoms and Bi atoms in

[0031] Step 2: After magnetically stirring the mixed solution obtained in Step 1, add the activator NH 4 Cl, and the reducing agent N was added dropwise 2 h 4 ·H 2 O, to adjust pH=10, and control NH 4 Cl and N 2 h 4 ·H 2 O follow with NaN 3 The molar ratio of 1:1:3 was added, and then stirred at room temperature for one hour, so that it was fully mixed to obtain a precursor solution for microwave hydrothermal reaction;

[0032] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, and use N 2 Seal the kettle, then put the reaction kettle into the microwave hydrothermal reac...

Embodiment 3

[0035] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and NaN 3 Put into the beaker, add 60ml deionized water in the beaker, obtain mixed liquor, wherein Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NaN 3 The amount added is R N =3,R N is NaN 3 The molar ratio of N atoms and Bi atoms in

[0036] Step 2: After magnetically stirring the mixed solution obtained in Step 1, add the activator NH 4 Cl, and the reducing agent N was added dropwise 2 h 4 ·H 2 O, to adjust pH=12, and control NH 4 Cl and N 2 h 4 ·H 2 O follow with NaN 3 The molar ratio of 1:1:3 was added, and then stirred at room temperature for one hour, so that it was fully mixed to obtain a precursor solution for microwave hydrothermal reaction;

[0037] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, and use N 2 Seal the kettle, then put the reaction kettle into the microwave hydrothermal re...

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 provides a method for preparing tungstate with visible-light photocatalytic activity by a microwave hydrothermal process, which comprises the following steps: adding bismuth nitrate pentahydrate, sodium tungstate dihydrate and sodium azide respectively used as a Bi source, a W source and an N source, a small amount of hydrazine hydrate used as reducer and a small amount of ammonium chloride used as an activating agent, wherein the bismuth nitrate pentahydrate and the sodium tungstate dihydrate are added according to the Bi:W mol ratio of 2:1, and the sodium azide is added according to the N:Bi mol ratio of 1-3; regulating the pH value to 7-12, and mixing and stirring to obtain a precursor solution; after transferring the precursor solution into a reaction kettle, sealing the kettle with N2; carrying out microwave reaction in an N2 atmosphere at 180 DEG C for 60 minutes; and when the temperature drops to room temperature, taking out the reaction kettle, collecting the precipitate, cleaning and drying. The method provided by the invention has the advantages of low reaction temperature and short time. The prepared powder has high reaction activity, has high degradation effect for organic dye rhodamine B under visible light irradiation, and thus, is a tungstate material with very high visible-light photocatalytic activity.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a method for preparing a tungstate with visible light photocatalytic activity by a microwave hydrothermal method. Background technique [0002] Catalytic reaction is a way to use the most abundant energy in nature—sunlight energy for material conversion, and it is one of the many ways of interaction between light and matter. Under the light, the photocatalyst converts the light energy into the energy required by the chemical reaction to produce a catalytic effect, so that the surrounding oxygen and water molecules are excited into free negative ions with great oxidative power. [0003] Photocatalysis has become an ideal environmental pollution control technology and clean energy production technology due to its unique properties such as deep reaction at room temperature and direct use of solar energy as a light source to drive the reaction. Photocatalytic technolo...

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): B01J23/31B01J37/34C02F1/30
CPCY02W10/37
Inventor 谈国强黄靖
Owner 盐城市鹤业实业投资有限公司