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Method for preparing fluorine-mixed bismuth tungstate powder through microwave hydrothermal method

A microwave hydrothermal and bismuth tungstate technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of low activity, small specific surface area, large particles, etc., and achieve high reaction activity, low reaction temperature, The effect of low energy consumption

Active Publication Date: 2012-10-10
盐城青墩津邦水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The bismuth tungstate reported earlier in the literature is mostly prepared by high-temperature solid-state reaction method, with large particles and small specific surface area, resulting in relatively low activity.

Method used

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  • Method for preparing fluorine-mixed bismuth tungstate powder through microwave hydrothermal method
  • Method for preparing fluorine-mixed bismuth tungstate powder through microwave hydrothermal method
  • Method for preparing fluorine-mixed bismuth tungstate powder through microwave hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and NH 4 Put F into a beaker, add deionized water to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NH 4 F concentration is 0.025mol / L;

[0016] Step 2: Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for microwave hydrothermal reaction;

[0017] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 300W, and set the temperature at 180°C Stop reaction after reacting for 60mins;

[0018] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reactor;

[0019] Step 5: washing the precipitate with water and absolute ethanol to neutrality;

[0020] Step 6: Dry at 80°C for 12 hours, take it out...

Embodiment 2

[0022] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and NH 4 Put F into a beaker, add deionized water to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NH 4 F concentration is 0.05mol / L;

[0023] Step 2: Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for microwave hydrothermal reaction;

[0024] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 300W, and set the temperature at 160°C Stop reaction after reacting for 60mins;

[0025] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reactor;

[0026] Step 5: washing the precipitate with water and absolute ethanol to neutrality;

[0027] Step 6: Dry at 80°C for 12 hours, take it out ...

Embodiment 3

[0029] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and NH 4 Put F into a beaker, add deionized water to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 O concentration is 0.1mol / L, Na 2 WO 4 2H 2 O concentration is 0.05mol / L, NH 4 F concentration is 0.075mol / L;

[0030] Step 2: Stir magnetically at room temperature for 30 minutes to mix the raw materials evenly to obtain a precursor solution for microwave hydrothermal reaction;

[0031] Step 3: Put the precursor solution obtained in step 2 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 300W, and set the temperature at 240°C Stop reaction after reacting for 60mins;

[0032] Step 4: After the reaction temperature drops to room temperature, take out the precipitate in the reactor;

[0033] Step 5: washing the precipitate with water and absolute ethanol to neutrality;

[0034] Step 6: Dry at 80°C for 12 hours, take it out...

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Abstract

The invention provides a method for preparing fluorine-mixed bismuth tungstate powder through a microwave hydrothermal method. The method comprises the steps as follows: with bismuth nitrate pentahydrate, sodium tungstate dehydrate and ammonium fluoride as raw materials, dissolving Bi(NO3)3.5H20 and Na2WO4.2H2O into deionized water according to the mole ratio of Bi:W of 2:1, adding a certain amount of NH4F, magnetically stirring the raw material at a room temperature to make the raw material be uniformly mixed so as to obtain a precursor solution for microwave hydrothermal reaction, transferring the precursor solution into a reaction kettle, adopting the microwave hydrothermal method to react the precursor solution at the temperature of 160 DEG C to 240 DEG C, and controlling the time for heat preservation for 60 minutes so as to obtain the fluorine-mixed bismuth tungstate powder. The method provided by the invention has the advantages of simple device, low temperature (about 200 DEG C), high efficiency (the reaction time is about 60 minutes), high powder reacting activity, simple technology, high efficiency, low energy consumption, low cost, environment protection and the like.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a method for preparing fluorine-doped bismuth tungstate powder by a microwave hydrothermal method. Background technique [0002] As a new type of environmental pollutant reduction technology, semiconductor photocatalysis technology uses the surface of semiconductor oxide materials to be activated under light, effectively oxidizes and decomposes organic matter, reduces heavy metal ions and other characteristics, antibacterial and odor removal, and is used in sewage treatment and air pollution. It has broad application prospects in purification, solar energy utilization, antibacterial and self-cleaning functions. As a new type of photocatalyst, bismuth tungstate has the characteristics of good ultraviolet and visible light response, thermal stability, photocatalytic stability, relatively low cost, and environmental friendliness. [0003] In order to improve the utilization rate of...

Claims

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Application Information

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IPC IPC(8): C01G41/00
Inventor 谈国强黄靖
Owner 盐城青墩津邦水务有限公司
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