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Method and application for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate

A technology of nanosheets and concentrates is applied in the field of scheelite concentrate to synthesize Au-doped WO3 nanosheets, which can solve the problems of high price and achieve the effects of good reversibility, low preparation cost and good application prospects.

Active Publication Date: 2019-06-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Prepare WO in existing 3 In the research of nanomaterials, sodium tungstate, ammonium paratungstate, tungsten hexachloride, tungstic acid and other analytically pure or high-purity elemental tungsten metals are mostly used as tungsten sources. These agents are expensive and have certain pollution.

Method used

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  • Method and application for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate
  • Method and application for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate
  • Method and application for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate

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Embodiment 1

[0052] The invention is a kind of synthetic Au-doped WO with scheelite concentrate 3 The method of nanosheet and its function in NO 2 Application of gas sensor. The X-ray diffraction spectrum and the scanning electron microscope photograph of the scheelite concentrate (grade being 62.36%) adopted in the present invention are as follows figure 1 As shown, the results show that the raw material of scheelite concentrate is composed of irregular massive particles, and its main useful mineral is CaWO 4 . A gas-sensitive coating for Au-doped WO 3 The gas sensor of nanosheets, its structure schematic diagram is as follows figure 2 As shown, where the heating wire 2 is made from Al 2 o 3 The ceramic tube 1 traverses and is welded on the heating electrode of the hexagonal base, the gold electrode 3 is coated on the outer surface of the ceramic tube 1 and welded on the measuring electrode of the hexagonal base through the platinum wire 4, the gas-sensitive coating 5 is coated c...

Embodiment 2

[0068] A gas-sensitive coating for Au-doped WO 3 The gas sensor of nanosheets, its structure schematic diagram is as follows figure 2 shown.

[0069] A kind of synthesis of Au-doped WO from scheelite concentrate 3 Preparation method of nanosheets and NO 2 Gas sensor, follow the steps below:

[0070] ①Under the conditions of NaOH concentration of 17.57mol / L, liquid-solid ratio of 1:1, reaction temperature of 180°C, holding time of 120min, and stirring speed of 400rpm, the scheelite concentrate was leached with NaOH to obtain the leached product, and the leached product was filtered to obtain The filtrate and the leaching slag were washed with deionized water for 3 times to obtain a washing solution, and the filtering solution and the leaching solution were combined to obtain a leaching solution containing sodium tungstate;

[0071] ② Dilute the solution obtained in step ①, and add 70 mL of deionized water to 2 mL of the leaching solution containing sodium tungstate with a ...

Embodiment 3

[0078] A gas-sensitive coating for Au-doped WO 3 The gas sensor of nanosheets, its structure schematic diagram is as follows figure 2 shown.

[0079] A kind of synthesis of Au-doped WO from scheelite concentrate 3 Preparation method of nanosheets and NO 2 Gas sensor, follow the steps below:

[0080] ①Under the conditions of NaOH concentration of 17.57mol / L, liquid-solid ratio of 1:1, holding time of 120min, stirring speed of 400rpm, and reaction temperature of 180°C, the scheelite concentrate was leached with NaOH to obtain the leached product, and the leached product was filtered to obtain The filtrate and the leaching slag were washed with deionized water for 3 times to obtain a washing solution, and the filtering solution and the leaching solution were combined to obtain a leaching solution containing sodium tungstate;

[0081] ② Dilute the solution obtained in step ①, and add 70 mL of deionized water to 10 mL of leaching solution containing sodium tungstate with a W c...

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Abstract

A method and application for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate relates to the field of gas sensors of semiconductor oxides. The method for synthesizing Au-doped WO3 nano-sheets from scheelite concentrate is as follows: the scheelite concentrate is transformed and preliminarily purified by NaOH leaching process to obtain a leach solution containing sodium tungstate, wherein the solution is diluted into a solution with a sodium tungstate concentration of 0.019-0.044 mol / L as a precursor, and is mixed with a HAuCl4 solution and a CaCl2 solution, wherein the mixing ratio is Au, W and Ca is 0.3-1%: 1: 3-14. The Au-doped WO3 nano-sheets NO2 gas sensor prepared by the method of the invention can realize high sensitivity and high selectivity rapid detection of low concentration, even ppb-level NO2 gas. Low-cost and low-pollution scheelite concentrate is used as tungsten source, which greatly reduces the cost from raw materials and preparation process.

Description

technical field [0001] The invention relates to the technical field of gas sensors of semiconductor oxides, in particular to a method for synthesizing Au-doped WO with scheelite concentrate. 3 Methods and applications of nanosheets. Background technique [0002] In the past few decades, with the rapid development of economic construction and the continuous acceleration of industrialization, more and more toxic and harmful gases have been discharged into the air, causing serious air pollution and seriously endangering human physical and mental health. NO 2 It is a corrosive and highly toxic gas, mainly from the emissions of factories and motor vehicles and the high-temperature combustion of some petroleum fuels. It is the main cause of acid rain and photochemical smog, and can also cause the thinning of the ozone layer, acidification of the land and surface A series of environmental problems such as water eutrophication. Most importantly, NO 2 It is extremely harmful to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02G01N27/12B82Y40/00
Inventor 沈岩柏李停停钟祥熙李国栋高淑玲崔宝玉魏德洲
Owner NORTHEASTERN UNIV
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