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A method for preparing cr2wo6 nanocrystals by a sonochemically assisted hydrothermal method

A nanocrystalline and hydrothermal technology, applied in the field of tungstate nanomaterials, can solve the problems of reduced catalyst specific surface area, unsatisfactory photocatalytic efficiency, large particle size, etc. control, good crystallinity

Active Publication Date: 2015-11-11
盐城大数据资产经营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method for preparing cr2wo6 nanocrystals by a sonochemically assisted hydrothermal method
  • A method for preparing cr2wo6 nanocrystals by a sonochemically assisted hydrothermal method

Examples

Experimental program
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Embodiment 1

[0030] Step 1: Analytical pure Cr(NO 3 ) 3 9H 2 O was added to deionized water with constant stirring to prepare Cr 3+ A transparent solution A with a concentration of 0.2mol / L;

[0031] Step 2: Analytical pure Na 2 WO 4 2H 2 O was added to deionized water with constant stirring to prepare WO 4 2- A transparent solution B with a concentration of 0.1mol / L;

[0032] 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;

[0033] Step 4: adjust the pH of the green precursor suspension to 5.0 with 1mol / L sodium hydroxide aqueous solution to obtain a mixture;

[0034] Step 5: Put the mixture into an ultrasonic cleaner for ultrasonic vibration, set the ultrasonic time to 30min, the ultrasonic power to 400W, and the ultrasonic temperature to 60°C;

[0035] Step 6: Pour the ultrasonically o...

Embodiment 2

[0039] Step 1: Analytical pure Cr(NO 3 ) 3 9H 2 O was added to deionized water with constant stirring to prepare Cr 3+ A transparent solution A with a concentration of 0.10mol / L;

[0040] Step 2: Analytical pure Na 2 WO 4 2H 2 O was added to deionized water with constant stirring to prepare WO 4 2- A transparent solution B with a concentration of 0.05mol / L;

[0041] 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;

[0042] Step 4: Use 1mol / L sodium hydroxide aqueous solution to adjust the pH of the green precursor suspension to 3.0 to obtain a mixture;

[0043] Step 5: Put the mixture into an ultrasonic cleaner for ultrasonic vibration, set the ultrasonic time to 50min, the ultrasonic power to 300W, and the ultrasonic temperature to 50°C;

[0044] Step 6: Pour the ultrasonically...

Embodiment 3

[0047] Step 1: Analytical pure Cr(NO 3 ) 3 9H 2 O was added to deionized water with constant stirring to prepare Cr 3+ A transparent solution A with a concentration of 0.25mol / L;

[0048] Step 2: Analytical pure Na 2 WO 4 2H 2 O was added to deionized water with constant stirring to prepare WO 4 2- A transparent solution B with a concentration of 0.125mol / L;

[0049] 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;

[0050] Step 4: adjust the pH of the green precursor suspension to 7.0 with 1mol / L sodium hydroxide aqueous solution to obtain a mixture;

[0051] Step 5: Put the mixture into an ultrasonic cleaner for ultrasonic vibration, set the ultrasonic time to 60min, the ultrasonic power to 300W, and the ultrasonic temperature to 80°C;

[0052] Step 6: Pour the ultrasonicall...

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Abstract

The invention provides a method for preparing Cr2WO6 nanocrystalline by using hydrothermal method assisted by phonochemistry. The method comprises the following steps of adding a Cr(NO3)3 solution into an Na2WO4 solution, adjusting the pH to be 1.0-7.0, then carrying out ultrasonic concussion for 10-60 minutes, pouring into a hydrothermal reaction to control the hydrothermal temperature to be 150-200DEG C and reacting for 1-24 hours, carrying out centrifugation, washing and drying on a product obtained through the reaction to obtain the Cr2WO6 nanocrystalline. The method provided by the invention is a method for synthesizing Cr2WO6 nanocrystalline under condition of low temperature and liquid phase, is simple in process, high in yield, short in period, low in cost, and can be used for expanding the synthetic technique range of the Cr2WO6 nanocrystalline, and the raw materials are easily available. The Cr2WO6 nanocrystalline prepared by the method in the invention grows completely, has relatively high purity, is uniform in size and has relative good dispersibility, and can change precursor liquid formation to regulate the grain size of products.

Description

technical field [0001] The invention belongs to the technical field of tungstate nanomaterials, in particular to a sonochemically assisted hydrothermal method for preparing Cr 2 WO 6 nanocrystal approach. 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 ferroelectric materials; the research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00B82Y30/00
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 盐城大数据资产经营管理有限公司
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