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Method for preparing pyramid-shaped Cr2WO6 microcrystalline by hydrothermal-assisted low-temperature calcination

A low-temperature calcination and hydrothermal assisted technology, which is applied in the field of tungstate nanomaterials, can solve the problems of reduced specific surface area of ​​catalysts, unsatisfactory photocatalytic efficiency, and large particle size, so as to achieve controllable product particle size, uniform size, and reaction The effect of low temperature

Active Publication Date: 2015-06-24
盐城抱璞文化传媒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method not only consumes a lot of energy, but also the particle size of the prepared sample is large, and the specific surface area of ​​the catalyst is greatly reduced. Although visible light response can be achieved, the photocatalytic efficiency is not ideal.

Method used

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  • Method for preparing pyramid-shaped Cr2WO6 microcrystalline by hydrothermal-assisted low-temperature calcination
  • Method for preparing pyramid-shaped Cr2WO6 microcrystalline by hydrothermal-assisted low-temperature calcination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: 6mmol analytically pure Cr(NO 3 ) 3 9H 2 O was added to 15mL of deionized water and stirred continuously to prepare a transparent solution A;

[0027] Step 2: 3mmol analytically pure Na 2 WO 4 2H2 Add O into 15mL deionized water, and keep stirring to prepare a transparent solution B;

[0028] Step 3: According to the volume ratio of transparent solution A: transparent solution B is 2:1, slowly add transparent solution A to transparent solution B, and stir with a magnetic stirrer for 30 minutes to form a green precursor suspension;

[0029] Step 4: adjust the pH of the green precursor suspension to 8.0 with 0.8mol / L sodium hydroxide aqueous solution to obtain a mixture;

[0030] Step 5: Pour the mixture into the hydrothermal reaction kettle, and control the filling degree at 40%; then seal the hydrothermal reaction kettle, put it into a homogeneous reactor, control the hydrothermal temperature at 160°C for 12 hours, and naturally cool to room temperature; ...

Embodiment 2

[0035] Step one: 8mmol analytically pure Cr(NO 3 ) 3 9H 2 O was added to 15mL of deionized water and stirred continuously to prepare a transparent solution A;

[0036] Step 2: 4mmol analytically pure Na 2 WO 4 2H 2 Add O into 15mL deionized water, and keep stirring to prepare a transparent solution B;

[0037] Step 3: According to the volume ratio of transparent solution A: transparent solution B is 1:1, slowly add transparent solution A to transparent solution B, and stir with a magnetic stirrer for 30 minutes to form a green precursor suspension;

[0038] Step 4: adjust the pH of the green precursor suspension to 7.0 with 1mol / L sodium hydroxide aqueous solution to obtain a mixture;

[0039] Step 5: Pour the mixture into the hydrothermal reaction kettle, and control the filling degree at 40%; then seal the hydrothermal reaction kettle, put it into a homogeneous reactor, control the hydrothermal temperature at 180°C for 12 hours, and naturally cool to room temperature;...

Embodiment 3

[0043] Step 1: 6mmol analytically pure Cr(NO 3 ) 3 9H 2 O was added to 20mL deionized water and stirred continuously to prepare a transparent solution A;

[0044] Step 2: 6mmol analytically pure Na 2 WO 4 2H 2 O was added to 20mL deionized water, and stirred continuously, to prepare a transparent solution B;

[0045] Step 3: Slowly add transparent solution A to transparent solution B according to the volume ratio of transparent solution A:transparent solution B of 1:2, and stir with a magnetic stirrer for 30 minutes to form a green precursor suspension;

[0046] Step 4: adjust the pH of the green precursor suspension to 10.0 with 1mol / L sodium hydroxide aqueous solution to obtain a mixture;

[0047] Step 5: Pour the mixture into the hydrothermal reaction kettle, and the filling degree is controlled at 50%; then seal the hydrothermal reaction kettle, put it into a homogeneous reactor, control the hydrothermal temperature at 170°C for 24 hours, and naturally cool to room ...

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Abstract

The invention provides a method for preparing pyramid-shaped Cr2WO6 microcrystalline by hydrothermal-assisted low-temperature calcinations. The method comprises the following steps of adding Cr(NO3)3 solution to Na2WO4 solution, adjusting pH value to 7.0-12.0, pouring the solution to a hydrothermal reaction kettle, reacting for 1-24h at hydrothermal temperature of 100-200 DEG C, centrifuging the product, washing, drying and calcining for 2-4h in a muffle furnace at 400-650 DEG C to obtain Cr2WO6 microcrystalline. The method has the advantages that the raw materials used for preparing Cr2WO6 microcrystalline are easily available, the yield is high, the time of low-temperature calcination is short, the reaction temperature is low, the reaction energy consumption is low, the cost is saved, the prepared Cr2WO6 microcrystalline develops completely and has high purity, even size and good dispersity, is suitable for large-scale production and has a bright development prospect.

Description

technical field [0001] The invention belongs to the technical field of tungstate nanomaterials, and in particular relates to a kind of hydrothermal assisted low-temperature calcination to prepare pyramidal Cr 2 WO 6 microcrystalline method. Background technique [0002] Tungstate has the characteristics of various types, good performance, changeable crystal morphology, and high added value. With its excellent optical and electrical properties, tungstate is not only widely used in the fields of sensors, optics, scintillation crystals, laser substrates, and acoustic fibers. It has potential applications in corrosion inhibition, electrodes, catalysis, photoanodes, light absorption, coatings and other fields. Chromium tungstate (Cr 2 WO 6 ) is one of the tungstate series, because of its special optical, electrical and magnetic properties, it is considered to have potential applications in the fields of optical fibers, scintillators, humidity sensors, magnetic materials and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00
Inventor 黄剑锋周文敏李嘉胤曹丽云卢靖欧阳海波吴建鹏孔新刚
Owner 盐城抱璞文化传媒有限公司
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