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WO3-TiO2 nano composite material with egg yolk-egg shell structure and preparation method thereof

A nanocomposite material and eggshell technology, applied in the field of nanomaterials, can solve problems such as weak permeability, limited contact area, voids and small specific surface area, and achieve the effect of strong permeability, simple operation, and large specific surface area

Active Publication Date: 2018-11-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of the structure of WO 3 -TiO 2 Nanocomposite materials contain small voids and specific surface area, weak permeability, small amount of supported catalyst molecules, only one or two contact surfaces between catalyst molecules and reactant molecules, and the contact area is limited, which leads to photocatalytic performance will not be high

Method used

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  • WO3-TiO2 nano composite material with egg yolk-egg shell structure and preparation method thereof
  • WO3-TiO2 nano composite material with egg yolk-egg shell structure and preparation method thereof
  • WO3-TiO2 nano composite material with egg yolk-egg shell structure and preparation method thereof

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preparation example Construction

[0045] This embodiment proposes a WO with egg yolk-eggshell structure 3 -TiO 2 The method for nanocomposite material, the preparation method of this nanocomposite material comprises the following steps:

[0046] a. Using tungsten-based compounds as precursors, WO was prepared by hydrothermal method 3 nanoparticles;

[0047] b. Using surfactants in WO 3 Soft templates are formed on the surface of nanoparticles;

[0048] c. Using titanium-based compounds as precursors, using sol-gel method on WO coated with surfactants 3 Mesoporous TiO can be formed on the surface of nanoparticles 2 Crystalline titanium dioxide in the shell layer to produce WO with egg yolk-eggshell structure 3 -TiO 2 nanocomposites.

[0049] Specifically, step a includes the following steps:

[0050] a1. Dissolving soluble tungstate in distilled water to prepare a tungstate solution, and then adding an acidic solution to the tungstate solution during stirring, and mixing evenly to obtain a tungsten-bas...

Embodiment 1

[0067] like figure 2 Shown, embodiment 1 proposes a kind of WO with egg yolk-eggshell structure 3 -TiO 2 The preparation method of nano composite material specifically comprises the following steps:

[0068] a. Needle-shaped WO 3 Preparation of nanoparticles

[0069] a1. Weigh a certain amount of Na 2 WO 4 2H 2 O was prepared into a 0.6mol / L solution in 10ml distilled water to form a sodium tungstate solution;

[0070] During the stirring process, hydrochloric acid was added to the sodium tungstate solution to adjust the pH to 2.72, and after stirring for 30 minutes, a tungsten-based precursor solution was obtained.

[0071] a2. Transfer the tungsten-based precursor solution to the reaction kettle and seal it. Heat the reaction kettle at 160°C for 42 hours. After the reaction is completed, the reaction kettle is cooled to room temperature with the furnace to obtain the reaction solution; take the reaction solution out of the reaction kettle , Centrifuge the product at...

Embodiment 2

[0083] Example 2 proposes a WO with egg yolk-eggshell structure 3 -TiO 2 The preparation method of nano composite material specifically comprises the following steps:

[0084] a. Needle-shaped WO 3 Preparation of nanoparticles

[0085] a1. Weigh a certain amount of Na 2 WO 4 2H 2 O was prepared into a 0.3mol / L solution in 10ml distilled water to form a sodium tungstate solution;

[0086] During the stirring process, hydrochloric acid was added to the sodium tungstate solution to adjust the pH to 2.77, and after stirring for 40 minutes, a tungsten-based precursor solution was obtained.

[0087] a2. Transfer the tungsten-based precursor solution to the reaction kettle and seal it. Heat the reaction kettle at 170°C for 42 hours. After the reaction is completed, the reaction kettle is cooled to room temperature with the furnace to obtain the reaction solution; take the reaction solution out of the reaction kettle , Centrifuge the product at 3600rpm, use deionized water and ...

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Abstract

The invention discloses a WO3-TiO2 nano composite material with an egg yolk-egg shell structure and a preparation method thereof. The WO3-TiO2 nano composite material is characterized in that egg yolkis movable WO3 nanoparticles, egg shell is a mesoporous TiO2 shell layer formed by TiO2 nanocrystal aggregates, and cavities exist between the WO3 nanoparticles and the mesoporous TiO2 shell layer. The preparation method comprises the following steps: by adopting a tungsten-based compound as a precursor, and by utilizing a hydrothermal method, preparing the WO3 nanoparticles; by utilizing a surface active agent, forming a soft template on the surfaces of the WO3 nanoparticles; adopting a titanium-based compound as a precursor, utilizing a sol-gel method to coat a crystalline titanium dioxidecapable of forming the mesoporous TiO2 shell layer on the surfaces of the WO3 nanoparticles coated with the surface active agent. The WO3-TiO2 nano composite material disclosed by the invention has large gaps, large specific surface area and strong permeability, and has the beneficial effects that more catalyst molecules can be loaded, the catalyst molecules can be better contacted with reactant molecules, the contact area is enlarged and the photocatalytic property is enhanced.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a WO with egg yolk-eggshell structure 3 -TiO 2 Nanocomposites and methods for their preparation. Background technique [0002] In recent years, titanium dioxide, as one of the typical photocatalyst materials, has been extensively studied in both breadth and depth. Although TiO 2 It has high catalytic activity and excellent application prospects, but due to its wide band gap (3.0-3.2eV), it can only be excited by ultraviolet light with a wavelength less than 388nm, which limits its practical application. limit. Therefore, modifying titanium dioxide to make it applicable in the visible light range and improve its photocatalytic performance is a hotspot of current research. The main way to improve its photocatalytic performance is to modify it. The means of modification mainly include noble metal or semiconductor surface modification, shape control and element doping. commonly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/02B01J35/00
CPCB01J23/30B01J35/396B01J35/23B01J35/40B01J35/39
Inventor 付海涛王文文杨晓红安希忠张浩弓梦丽贾倩
Owner NORTHEASTERN UNIV