Silver tungstate nanowire and preparation method thereof

A technology of nanowires and silver tungstate, which is applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of difficult recovery of silver tungstate, achieve nanowires with excellent shape, perfect shape, and low production cost Effect

Inactive Publication Date: 2017-01-18
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention solves the technical problem that the silver tungstate prepared by the exis...
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Abstract

The invention discloses silver tungstate nanowire and a preparation method thereof and belongs to the field of semiconductor photocatalysis materials and nano-materials. The invention aims to solve the technical problem that silver tungstate prepared by existing methods is hard to recover. The silver tungstate nanowire is prepared by using sodium tungstate and silver nitrate as main raw materials through a hydrothermal synthesis method. The preparation method of the invention comprises the following steps: stirring while dropwise adding a silver nitrate solution into a sodium tungstate solution, and adjusting pH value to 2.5-3 by the use of dilute nitric acid; putting the solution into a polytetrafluoroethylene-lined reaction vessel and carrying out a hydrothermal synthesis reaction; cooling after the hydrothermal reaction, opening the reaction vessel, fetching sediments, carrying out ultrasonic cleaning successively by the use of deionized water and anhydrous ethanol, and carrying out vacuum drying to obtain the silver tungstate nanowire. The invention is of great practical application significance and application value in photocatalytic degradation of environmental organic pollutants such as organic dye, etc.

Application Domain

Tungsten compounds

Technology Topic

Photocatalytic degradationPolytetrafluoroethylene +14

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  • Silver tungstate nanowire and preparation method thereof
  • Silver tungstate nanowire and preparation method thereof
  • Silver tungstate nanowire and preparation method thereof

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0031] Specific embodiment one: select analytically pure sodium tungstate (Na 2 WO 4 ) And silver nitrate (AgNO 3 ) Is the chemical raw material for the synthesis of silver tungstate. The raw materials are weighed according to the following chemical reaction ratio and then prepared into solutions: Na 2 WO 4 +2AgNO 3 →Ag 2 WO 4 +2NaNO 3. The preparation method of silver tungstate nanowires in this embodiment is specifically completed by the following steps:
[0032] Step 1. While stirring, add 50ml of 0.01M silver nitrate solution dropwise to 50ml of 0.005M sodium tungstate solution (generally 15-20 minutes), the sodium tungstate solution The molar ratio of sodium tungstate to silver nitrate in the silver nitrate solution is 1:2, and then the pH value of dilute nitric acid (the mass percentage concentration is 2%) is adjusted to 2.5;
[0033] Step 2. Then place it in a reaction kettle lined with polytetrafluoroethylene (PTFE) (the kettle material is chromium-nickel alloy (304II)), tighten the reaction kettle with a bench vise, and place it in an electric blast drying box. Carry out hydrothermal synthesis reaction for 12h under the condition of 150℃;
[0034] Step 3. After the hydrothermal reaction is finished, cool, open the reactor, remove the supernatant in the inner tank of the reactor, take the deposit, wash, and vacuum dry at 60°C for 2 hours to obtain silver tungstate nanowires;
[0035] Among them, the cleaning described in step 3 is carried out according to the following steps:
[0036] Step 1. Clean the sediment with deionized water, then ultrasonically clean for 5 minutes, and centrifuge at 15000r/min for 5 minutes;
[0037] Step 2. Repeat step 1 for 2 times;
[0038] Step 3. Finally, clean it once with absolute ethanol by centrifugation.

PUM

PropertyMeasurementUnit
Size100.0 ~ 300.0nm
Optical bandgap3.23eV

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