Method for preparing TiO2/BiVO4 composite photocatalyst by MH method

A microwave hydrothermal and catalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effects of short reaction time, inhibition of recombination, and simple process flow

Active Publication Date: 2012-07-18
南通润能机械有限公司
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Problems solved by technology

The present invention uses microwave hydrothermal synthesis technology to rapidly synthesize TiO 2 / BiVO 4 Composite photocatalysts have not been reported yet

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  • Method for preparing TiO2/BiVO4 composite photocatalyst by MH method
  • Method for preparing TiO2/BiVO4 composite photocatalyst by MH method
  • Method for preparing TiO2/BiVO4 composite photocatalyst by MH method

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Embodiment Construction

[0016] Step 1: Bi(NO 3 ) 3 ·5H 2 O and (NH 4 ) 2 TiF 6 Dissolve in 20mL of HNO with a concentration of 2mol / L 3 solution, where n Bi : n Ti =1:0.2, stir on a magnetic stirrer for 10-20min, and prepare mother salt solution A;

[0017] Step 2: Add NH 4 VO 3 Dissolve in 20mL NaOH solution with a concentration of 4mol / L, where n Bi : n V = 1: 1 Stir on a magnetic stirrer for 10-20 minutes to prepare mother salt solution B;

[0018] Step 3: mix the mother salt solution A obtained in step 1 and the mother salt solution B obtained in step 2 evenly, stir on a magnetic stirrer for 10-30 minutes, and prepare a precursor solution;

[0019] Step 4: Add the precursor solution into the microwave hydrothermal reaction kettle with a filling ratio of 40-60%, then place the reaction kettle in a microwave-assisted hydrothermal synthesizer, set the reaction temperature at 180-220°C, and hold the time for 60~120min;

[0020] Step 5: After the reaction is completed, cool down, take ou...

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Abstract

The invention discloses a method for preparing TiO2/BiVO4 composite photocatalyst by a MH (microwave-hydrothermal) method. The method comprises the steps as follows: Bi(NO3)3 5H2O and (NH4)2TiF6 are resolved in HNO3 to form mother salt solution A, NH4VO3 is resolved in NaOH solution to form mother salt solution B, the mother salt solution A and the mother salt solution B are mixed uniformly to form precursor solution, the precursor solution is placed in a microwave hydrothermal reaction kettle for microwave hydrothermal reaction and is cooled after the reaction is over, and yellow sediment in the reaction kettle is taken out and is washed and dried. According to the invention, TiO2/BiVO4 powder is synthesized quickly through a microwave-hydrothermal synthesis technology, and the photocatalysis performance of the powder is better because TiO2 particles are carried on the surface of BiVO4 to serve as an electron acceptor, and then compounding of a photon-generated carrier is inhibited, further the photocatalysis efficiency of pure-phase BiVO4 powder can be improved.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a microwave hydrothermal preparation of TiO 2 / BiVO 4 Method for composite photocatalysts. Background technique [0002] BiVO 4 With its special physical and optical properties, it has been gradually applied to the field of visible light photocatalysis, especially in the photodegradation of water, and has become a new type of visible light degradable water material, which has aroused widespread interest. However, BiVO 4 The electrons generated by photoexcitation in the body are difficult to migrate and easily recombine with holes, which reduces the photon quantum efficiency and visible light activity of the catalyst. [0003] In order to further increase the BiVO 4 The photocatalytic efficiency of two semiconductors with different bandgap widths is recombined, and its complementary properties can enhance charge separation, inhibit electron-hole recombination and expand the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J37/10B01J37/34C02F1/30
Inventor 谈国强魏莎莎
Owner 南通润能机械有限公司
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