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Preparation method for TiO2/InVO4 composite porous micro-sphere

A technology of porous microspheres and microspheres, applied in chemical instruments and methods, vanadium compounds, titanium oxide/hydroxide, etc., can solve the problems of difficult recovery of nano-powders, avoid homogeneous precipitation, large specific surface area and Effect of apparent size, high catalytic activity

Active Publication Date: 2014-04-30
ZHEJIANG UNIV
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Problems solved by technology

In the early stage, researchers have carried out combined research on the two and achieved good results. However, such research is still mainly focused on the preparation of nano-powde

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  • Preparation method for TiO2/InVO4 composite porous micro-sphere
  • Preparation method for TiO2/InVO4 composite porous micro-sphere

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preparation example Construction

[0020] TiO 2 / InVO 4 The preparation method of composite porous microsphere comprises the following steps:

[0021] Step A: Under stirring conditions, a certain amount of NH 4 VO 3 The aqueous solution was added dropwise with InCl 3 A clear yellow solution was formed in aqueous solution. Use ammonia water to adjust the pH value of the solution system to 4, and obtain a precipitate after stirring for 2 hours; filter and wash the precipitate for 3 times, then add it to an aqueous solution of cetyltrimethylammonium bromide (CTAB), continue stirring for 1 hour, and then transfer to a hydrothermal The reactor was subjected to hydrothermal reaction; after the hydrothermal reaction, the resulting precipitate was filtered, washed three times with distilled water and absolute ethanol, dried at 60°C for 4 hours, and then heat-treated in a muffle furnace to obtain InVO 4 porous microspheres.

[0022] Among them, NH 4 VO 3 The molar concentration of the aqueous solution is 0.1mol / ...

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Abstract

The invention relates to the field of semiconductor materials and aims to provide a preparation method for a TiO2/InVO4 composite porous micro-sphere. The method comprises the following steps: adding an NH4VO3 water solution into an InCl3 water solution; adjusting the pH value to 4 and agitating to obtain precipitate; adding the precipitate into a CTAB (Cetyltrimethyl Ammonium Bromide) water solution and carrying out a hydrothermal reaction; filtering, washing and drying the obtained precipitate and carrying out heat treatment to obtain an InVO4 porous micro-sphere; dispersing the InVO4 porous micro-sphere into absolute ethyl alcohol to obtain a dispersion system; gradually dripping polymer type TiO2 sol; filtering and drying the precipitate to finish a dip-coating procedure to obtain a TiO2 gel coated InVO4 porous micro-sphere; adding the TiO2 gel coated InVO4 porous micro-sphere into the water, agitating in a water bath, and filtering, washing and drying the precipitate to obtain a product. According to the preparation method for the TiO2/InVO4 composite porous micro-sphere, the nucleation and growth problems of a TiO2 nano crystal are solved so as to accelerate the TiO2 nano crystal to grow in the InVO4 composite porous micro-sphere in an in-situ manner and prevent homogeneous separation of the nano crystal in the solution in a traditional method; the problem that the high specific surface area and the recycling of catalytic materials cannot be considered at the same time is solved and the large specific surface area and apparent size can be obtained simultaneously.

Description

technical field [0001] The present invention relates to the field of semiconductor materials, in particular to TiO 2 / InVO 4 Preparation method of composite porous microspheres. Background technique [0002] InVO 4 It is an important narrow bandgap semiconductor with a forbidden band width of about 2.0eV. In recent years, due to the InVO 4 It has potential application prospects in solar energy utilization, environmental protection, gas sensing and other fields, and has attracted widespread attention. Early InVO 4 mainly In 2 o 3 and V 2 o 5 As a raw material, it is prepared by a high-temperature solid-phase method, but the product has coarse grains, a small specific surface area, and is prone to impurity phases. At present, InVO is prepared by wet chemical methods such as hydrothermal 4 Nanocrystalline particles have become a commonly used method, and many literature studies have reported that InVO 4 Research on morphology control and related properties of nanoma...

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Application Information

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IPC IPC(8): C01G23/047C01G31/00B82Y30/00
Inventor 申乾宏杨辉沈建超蔡奇风冯宇盛建松程笛
Owner ZHEJIANG UNIV
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