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Method for preparing nitrogen-doped bismuth tungstate powder photocatalyst through microwave hydrothermal method

A microwave hydrothermal method and photocatalyst technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of low utilization of sunlight, low photocatalytic activity, small specific surface area, etc. problem, to achieve the effect of no hysteresis effect, high photocatalytic activity, and large specific surface area

Inactive Publication Date: 2012-07-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional photocatalyst titanium dioxide (TiO 2 ) has the advantages of low cost, non-toxicity, high stability, and easy preparation. 2 The band gap is large, and it has photocatalytic activity only under the irradiation of ultraviolet light, and the energy in the ultraviolet region accounts for less than 5% of the sunlight energy, and the utilization rate of sunlight is not high
[0005] The high-temperature solid-phase method is a traditional method for preparing powders, which has the advantages of low cost, large output, and simple preparation process. 2 WO 6 The preparation of powders mostly adopts high-temperature solid-state reaction method, but this method consumes a lot of energy and has low efficiency, and the prepared particles are larger and have a smaller specific surface area, resulting in relatively low photocatalytic activity.

Method used

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  • Method for preparing nitrogen-doped bismuth tungstate powder photocatalyst through microwave hydrothermal method
  • Method for preparing nitrogen-doped bismuth tungstate powder photocatalyst through microwave hydrothermal method
  • Method for preparing nitrogen-doped bismuth tungstate powder photocatalyst through microwave hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and CO(NH 2 ) 2 Put it into a beaker, add an appropriate amount of deionized water to the beaker, in which Bi(NO 3 ) 3 Concentration is 0.05mol / L, Na 2 WO 4 The concentration is 0.025mol / L, R N for: R N =0(R N is the molar ratio of N to Bi), fully stirred until a white precipitate is produced, put the container containing the white precipitate into the ultrasonic instrument for 30mins, the precipitation reaction is complete, and the precursor solution of the microwave hydrothermal reaction is obtained;

[0024] Step 2: Put the precursor solution obtained in step 1 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 400w, and set the temperature at 180°C Stop reaction after reacting 60 minutes;

[0025] Step 3: After cooling down to room temperature, take out the precipitate in the reaction kettle, wash the precipitate with water ...

Embodiment 2

[0027] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and CO(NH 2 ) 2 Put it into a beaker, add an appropriate amount of deionized water to the beaker, in which Bi(NO 3 ) 3 The concentration is 0.1mol / L, Na 2 WO 4 Concentration is 0.05mol / L, R N for R N =2(R N is the molar ratio of N to Bi), fully stirred until a white precipitate is produced, put the container containing the white precipitate into an ultrasonic instrument for 30mins, the precipitation reaction is complete, and the precursor solution of the microwave hydrothermal reaction is obtained;

[0028] Step 2: Put the precursor solution obtained in step 1 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power to 500w, and set the temperature at 200°C Stop reaction after 30 minutes of reaction;

[0029] Step 3: After cooling down to room temperature, take out the precipitate in the reaction kettle, wash the precipitate with water a...

Embodiment 3

[0031] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and CO(NH 2 ) 2 Put it into a beaker, add an appropriate amount of deionized water to the beaker, in which Bi(NO 3 ) 3 Concentration is 0.04mol / L, Na 2 WO 4 The concentration is 0.02mol / L, RN for R N =0.8(R N is the molar ratio of N to Bi), fully stirred until a white precipitate is produced, put the container containing the white precipitate into an ultrasonic instrument for 10 mins, and the precipitation reaction is complete, and the precursor solution of the microwave hydrothermal reaction is obtained;

[0032] Step 2: Put the precursor solution obtained in step 1 into a polytetrafluoroethylene-lined reactor, then put the reactor into a microwave hydrothermal reactor MDS-8, set the power at 350w, and set the temperature at 200°C Stop reaction after 40 minutes of reaction;

[0033] Step 3: After cooling down to room temperature, take out the precipitate in the reaction kettle, wash the precipitate with w...

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Abstract

The invention provides a method for preparing a nitrogen-doped bismuth tungstate powder photocatalyst through a microwave hydrothermal method. The method comprises the following steps of: adding de-ionized water into bismuth nitrate pentahydrate and sodium tungstate dihydrate serving as raw materials and urea serving as an N source, stirring to uniformly mix the raw materials, stopping the stirring and producing white precipitate; placing in an ultrasonic instrument to perform ultrasonic treatment for 10-30 minutes; performing complete precipitation reaction to obtain precursor of microwave hydrothermal reaction; transferring the precursor into a reaction kettle; reacting by using the microwave hydrothermal method for 30-90 minutes at 160-200 DEG C; and taking out of the reaction kettle, collecting the precipitate, cleaning and drying. The method has the advantages of low reaction temperature of about 180 DEG C and short reaction time of probability 50-60 minutes; and the prepared powder has high reaction activity and low energy consumption and is environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a method for preparing a nitrogen-doped bismuth tungstate powder photocatalyst by a microwave hydrothermal method. Background technique [0002] Photocatalysis is one of the unique properties of semiconductors. The use of semiconductor photocatalysts can photolyze water to produce hydrogen, purify indoor air, photocatalytic self-cleaning, anti-mildew, photocatalytic antibacterial, photocatalytic sewage treatment, etc. Photocatalytic technology plays an important role in pollution control It has broad application prospects in protecting the environment, developing new energy sources and changing the energy structure. [0003] The traditional photocatalyst titanium dioxide (TiO 2 ) has the advantages of low cost, non-toxicity, high stability, and easy preparation. 2 The forbidden band width is large, and it has photocatalytic activity only under the irradiation of ultraviolet li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J37/10B01J37/34C02F1/30
CPCY02W10/37
Inventor 谈国强宋丽花
Owner SHAANXI UNIV OF SCI & TECH
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