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Preparation method of BiVO4/TiO2 core-shell composite photocatalyst

A composite light and catalyst technology, applied in the field of photocatalysis, to achieve good visible light photocatalytic activity, simple and controllable preparation method, and low cost effects

Inactive Publication Date: 2017-11-10
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, BiVO was prepared by hydrothermal method 4 / TiO 2 The method of core-shell composite photocatalyst has not been reported yet

Method used

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  • Preparation method of BiVO4/TiO2 core-shell composite photocatalyst
  • Preparation method of BiVO4/TiO2 core-shell composite photocatalyst
  • Preparation method of BiVO4/TiO2 core-shell composite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0039] figure 1 and figure 2 For the BiVO prepared in Example 1 of the present invention 4 / TiO 2 Schematic diagram of the surface morphology of the core-shell composite photocatalyst, using the BiVO prepared in Example 1 of the present invention 4 / TiO 2 The photocatalytic powder is a large particle with a core-shell structure.

[0040] image 3 and Figure 4 For the BiVO prepared in Example 1 of the present invention 4 / TiO 2 The EDS test positions A and B of the core-shell composite photocatalyst, using the BiVO prepared in Example 1 of the present invention 4 / TiO 2 The core-shell composite photocatalyst support is TiO 2, the cladding layer contains V and Bi elements.

[0041] Figure 5 For the BiVO prepared in Example 1 of the present invention 4 / TiO 2 The XRD spectrum of the core-shell composite photocatalyst, using the BiVO prepared in Example 1 of the present invention 4 / TiO 2 The core-shell composite photocatalyst is mainly composed of TiO 2 .

[...

Embodiment 2

[0048] Figure 6 and Figure 7 For the BiVO prepared in Example 2 of the present invention 4 / TiO 2 Schematic diagram of the surface morphology of the core-shell composite photocatalyst, using the BiVO prepared in Example 2 of the present invention 4 / TiO 2 The photocatalytic powder is a large particle with a core-shell structure.

[0049] Figure 8 and Figure 9 For the BiVO prepared in Example 2 of the present invention 4 / TiO 2 The EDS test positions C and D of the core-shell composite photocatalyst, using the BiVO prepared in Example 2 of the present invention 4 / TiO 2 The core-shell composite photocatalyst support is mainly TiO 2 , the transition layer contains a small amount of Bi and V elements, and the Bi and V elements in the cladding layer increase, indicating that the cladding layer is BiVO 4 .

[0050] Figure 10 For the BiVO prepared in Example 2 of the present invention 4 / TiO 2 The XRD spectrum of the core-shell composite photocatalyst, using the ...

Embodiment 3

[0058] Will 32gTiOSO 4 Add it into deionized water, fully stir and dissolve, and prepare a 1000mL solution with a concentration of 0.2mol / L; take a certain amount of TiOSO 4 solution, according to Ti:(NH 4 )=1:2 add urea, continue to stir until the urea is completely dissolved; transfer the mixed solution to a three-necked flask, heat to 95°C and keep it warm for 5h, white precipitate appears in the solution during the heating process; after the reaction is completed, the reaction product is used Centrifuge and wash with deionized water until neutral, then dry in an oven at 60°C; put the prepared powder in a muffle furnace for heat treatment, the heating system is: raise the temperature at 5°C / min to 300°C for 1 hour, Then heat up to 500°C at 5°C / min for 2h to obtain TiO 2 Carrier powder; 0.06gBi(NO 3 ) 3 ·5H 2 O was dissolved in 30mL deionized water and stirred until completely dissolved; 0.014gNH 4 VO 3 Dissolve in 30mL of deionized water at 50℃, stir until completely...

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Abstract

The invention provides a preparation method of a BiVO4 / TiO2 core-shell composite photocatalyst. The method comprises the following steps of adding TiOSO4 to deionized water; adding urea into the solution; transferring the solution into a three-mouth flask, heating the solution to 95 DEG C, maintaining the temperature for 5 h, and generating a white precipitate in the solution; conducting centrifugal washing on a reaction product with deionized water to until the reaction product is neutral, and drying the reaction product; placing prepared power into a muffle to heat, maintaining the temperature of the powder for 2 h, and obtaining a TiO2 carrier; dissolving Bi (NO3) 3 5H2O into deionized water; dissolving a NH4VO3 solution to deionized water; adding the TiO2 carrier to a prepared Bi (NO3)3 solution, after the mixed solution is stirred evenly, dropwise adding the NH4VO3 solution to the mixed solution slowly, adjusting the solution with ammonia until pH is equal to 7, and continuously stirring the solution for 1 h; transferring a suspension liquid into a tetrafluoroethylene reaction still, and then adding the liquid into a drying oven; after the reaction is finished, washing the reaction product with deionized water and absolute ethyl alcohol to neural, drying the product, and obtaining BiVO4 / TiO2 powder. The preparation method of the BiVO4 / TiO2 core-shell composite photocatalyst is high in visible light photocatalytic activity, low in cost, simple and easy to control.

Description

technical field [0001] The present invention relates to the technical field of photocatalysis, especially a kind of BiVO 4 / TiO 2 Preparation method of core-shell composite photocatalyst. Background technique [0002] Using solar energy and other natural resources to solve problems such as environmental pollution is one of the research hotspots in the world today. In the 1970s, Fujishima and Houda discovered TiO excited by light 2 After the electrode can decompose water into hydrogen and oxygen, photocatalytic oxidation technology came into being. But TiO 2 As a wide bandgap semiconductor, it can only be excited by ultraviolet light with a wavelength less than 385nm, which limits its effective use of sunlight. In recent years, some new narrow bandgap semiconductor compound TiO 2 Reports continue to appear, such as WO 3 / TiO 2 , CdS / TiO 2 , Fe 2 o 3 / TiO 2 Wait. However, BiVO was prepared by hydrothermal method 4 / TiO 2 The method of core-shell composite photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/648
CPCB01J23/002B01J23/6482B01J35/39
Inventor 鄂磊赵心雨赵丹赵巍周彩楼
Owner TIANJIN CHENGJIAN UNIV
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