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Synthesis method of tungsten trioxide

A tungsten trioxide and synthesis method technology, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve the problems of many operation steps and low degradation efficiency, achieve good repeatability, high photodegradation efficiency, and reduce production costs

Inactive Publication Date: 2013-04-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has many steps and the degradation efficiency is not high, so it is necessary to find a new synthesis method, which is simple to operate and can improve the degradation efficiency

Method used

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  • Synthesis method of tungsten trioxide
  • Synthesis method of tungsten trioxide
  • Synthesis method of tungsten trioxide

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0053] (1) Weigh 0.825g of sodium tungstate dihydrate and 0.29g of sodium chloride respectively, and add them into 75mL of water so that the concentration of sodium tungstate dihydrate in water is 0.033mol / L. Ultrasound for 5min, under magnetic stirring, Use hydrochloric acid to adjust the pH value of the solution to 1.5, and continue stirring for 1 hour to obtain a precursor solution;

[0054] (2) Transfer the precursor solution to the reaction kettle, conduct a hydrothermal reaction at 180°C for 24 hours, and cool to room temperature naturally. The obtained product is washed with distilled water and absolute ethanol in turn, centrifuged and dried to obtain WO 3 Powder.

[0055] The synthetic WO of embodiment 1 3 X-ray diffraction pattern of powder (RigakuMax-2550 X-ray diffraction analyzer, XRD) see figure 1 , scanning electron micrograph (SEM, SHIMADZUSSX-550 scanning electron microscope) see figure 2 , UV-visible absorption spectrum (Shimadzu company UV-3600 UV-visible...

Embodiment 2

[0058] Adjust the pH value of the precursor solution to 2.1 to prepare WO 3 , the synthesis process is the same as in Example 1.

[0059] The synthetic WO of embodiment 2 3 For powder XRD see Image 6 , see SEM Figure 7 , see the UV-Vis absorption spectrum Figure 8 , the surface photovoltage spectrum is shown in Figure 9 , the photodegradation curve of catalytic degradation of RhB is shown in Figure 10 .

[0060] Depend on Figure 7 It can be seen that the WO obtained under the condition of pH=2.1 3 The shape of the disc is 6 μm in diameter and 2 μm in thickness, with a porous structure; Figure 8 with Figure 9 Visible, the WO 3 With visible light response characteristics, the absorption of visible light extends to 460nm, and the maximum light response intensity is about 60μV; by Figure 10 Visible to WO 3 powder as a catalyst, when WO 3 When the dosage is 0.02g, 20mL RhB with a concentration of 10mg / L is catalytically degraded, and RhB is degraded by 90% whe...

Embodiment 3

[0062] Adjust the pH value of the precursor solution to 3.0 to prepare WO 3 , the synthesis process is the same as in Example 1.

[0063] The synthetic WO of embodiment 3 3 For powder XRD see Figure 11 , see SEM Figure 12 , see the UV-Vis absorption spectrum Figure 13 , the surface photovoltage spectrum is shown in Figure 14 , the photodegradation curve of catalytic degradation of RhB is shown in Figure 15 .

[0064] Depend on Figure 11 It can be seen that when the pH of the precursor is 3, WO 3 For orthorhombic crystal form; by Figure 12 It can be seen that when the pH of the precursor is 3, the resulting WO 3 It has a uniform nanowire morphology with a length of about 10 μm; by Figure 13 with Figure 14 It can be seen that the sample has strong ultraviolet light response characteristics, and also has a weak response to visible light, and the response wavelength range to light is less than 440nm; Figure 15 Visible to WO 3 powder as a catalyst, when WO 3...

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Abstract

The invention provides a synthesis method of tungsten trioxide, belongs to the technical field of inorganic synthesis chemistry, and particularly relates to the synthesis method of the tungsten trioxide. The synthesis method comprises the following steps of: taking sodium tungstate dihydrate and sodium chloride as raw materials; utilizing hydrochloric acid to adjust a pH (Potential of Hydrogen) value of a reaction system to adjust the pH value to 1.5-3.0; carrying out hydrothermal reaction at 170-190 DEG C for 22-28 hours; and washing, centrifuging and drying to obtain tungsten trioxide powder. The obtained tungsten trioxide powder has different shapes and different photoelectric properties. According to the synthesis method disclosed by the invention, a one-step hydrothermal synthesis method is adopted, so that the operation is simple, the repetitiveness is good and the raw material cost is low; and the pH value is simply adjusted to obtain the tungsten trioxide powder with the different shapes and the different photoelectric properties, and the photocatalytic degradation efficiency on an organic dye is higher.

Description

technical field [0001] The invention relates to the technical field of inorganic synthetic chemistry, in particular to a one-step hydrothermal synthesis method of tungsten trioxide. Background technique [0002] Metal oxides have played a key role in the development of many advanced functional materials and smart devices. Among many metal oxides, tungsten trioxide (WO 3 ) is a relatively unique material that has attracted much attention due to its versatility. [0003] WO 3 It is an N-type semiconductor with a variety of crystal forms, a band gap of 2.5~2.8eV, and a visible light response characteristic. Therefore WO 3 Can be used as light sensing devices, such as photochromic devices and transparent electrodes; while WO 3 It can also be used as a visible light photocatalyst to degrade organic pollutants and heavy metal ions in sewage by photodynamic force, which is environmentally friendly and economical; in terms of indoor environmental detection, WO 3 Can be made in...

Claims

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Application Information

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IPC IPC(8): C01G41/02
Inventor 谢腾峰徐丹丹王德军
Owner JILIN UNIV
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