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Visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and preparation method thereof

A ternary composite and photocatalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of poor photocatalytic activity, slow rate, It is difficult to adsorb organic matter and other problems, and achieve the effect of improving adsorption capacity, inhibiting agglomeration, and simple preparation method

Active Publication Date: 2016-09-21
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Second, the heterogeneous photocatalytic process is accompanied by the adsorption process of the catalyst to the degradation products, and the binary composite nanoparticles are all inorganic particles, and it is difficult to effectively adsorb organic substances on the hydrophilic surface, which makes the photogenerated carriers transfer to the organic molecules. The rate slows down, resulting in poor photocatalytic activity

Method used

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  • Visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and preparation method thereof
  • Visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and preparation method thereof
  • Visible-light-responsive BiVO4/TiO2/graphene tri-material composite light catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Catalyst preparation

[0052] ①At room temperature, 0.485g Bi(NO 3 ) 3 ·5H 2 O dissolved in 10mL concentrated nitric acid (14.5mol / L), 0.117gNH 4 VO 3 Dissolve in 10mL NaOH solution (6mol / L), mix the two solutions evenly under the action of ultrasound, adjust the pH value to 7 with NaOH solution, and the generated product contains BiVO 4 Suspension of nanoparticles.

[0053] ②At room temperature, ultrasonically disperse 0.20 g of graphene oxide and 2.0 g of tetrabutyl titanate in a mixed solution of 250 mL of absolute ethanol and 10 mL of deionized water to form a suspension system containing titanium dioxide sol-gel and graphene oxide.

[0054] ③BiVO prepared in step ① 4 The solution was added dropwise to the mixed solution containing tetrabutyl titanate and graphene oxide prepared in step ②, and heated in an oil bath at 120°C for 8 hours to obtain BiVO 4 / TiO 2 / mixed solution of graphene oxide composite material, the mixed solution was placed in a 60°C ov...

Embodiment 2

[0065] (1) Catalyst preparation

[0066] ①At room temperature, 0.970g Bi(NO 3 ) 3 ·5H 2 O dissolved in 10mL concentrated nitric acid (14.5mol / L), 0.234gNH 4 VO 3 Dissolve in 10mL NaOH solution (6mol / L), mix the two solutions evenly under the action of ultrasound, adjust the pH value to 7 with NaOH solution, and the generated product contains BiVO 4 Suspension of nanoparticles.

[0067] ②At room temperature, ultrasonically disperse 0.20 g of graphene oxide and 2.0 g of tetrabutyl titanate in a mixed solution of 250 mL of absolute ethanol and 10 mL of deionized water to form a suspension system containing titanium dioxide sol-gel and graphene oxide.

[0068] ③BiVO prepared in step ① 4 The solution was added dropwise to the mixed solution containing tetrabutyl titanate and graphene oxide prepared in step ②, and heated in an oil bath at 120°C for 8 hours to obtain BiVO 4 / TiO 2 / mixed solution of graphene oxide composite material, the mixed solution was placed in a 60°C ov...

Embodiment 3

[0079] (1) Catalyst preparation

[0080] ①At room temperature, 1.94g Bi(NO 3 ) 3 ·5H 2 O dissolved in 10mL concentrated nitric acid (14.5mol / L), 0.468gNH 4 VO 3 Dissolve in 10mL NaOH solution (6mol / L), mix the two solutions evenly under the action of ultrasound, adjust the pH value to 7 with NaOH solution, and the generated product contains BiVO 4 Suspension of nanoparticles.

[0081] ②At room temperature, ultrasonically disperse 0.20 g of graphene oxide and 2.0 g of tetrabutyl titanate in a mixed solution of 250 mL of absolute ethanol and 10 mL of deionized water to form a suspension system containing titanium dioxide sol-gel and graphene oxide.

[0082] ③BiVO prepared in step ① 4 The solution was added dropwise to the mixed solution containing tetrabutyl titanate and graphene oxide prepared in step ②, and heated in an oil bath at 120°C for 8 hours to obtain BiVO 4 / TiO 2 / mixed solution of graphene oxide composite material, the mixed solution was placed in a 60°C ove...

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Abstract

The present invention discloses a visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst and a preparation method thereof. The preparation method comprises the steps of (1) preparing a suspension system A containing BiVO4 nano particles, and a suspension system B containing a TiO2 sol-gel and graphene oxide; (2) proportionally mixing up the suspension system A and the suspension system B, conducting the heating treatment, separating and drying to obtain a BiVO4 / TiO2 / graphene oxide composite material; (3) suspending the BiVO4 / TiO2 / graphene oxide composite material in short-chain alcohol, adding a reducing agent, conducting the hydrothermal reaction and drying to obtain the visible-light-responsive BiVO4 / TiO2 / graphene tri-material composite light catalyst. The preparation method is simple and easy to operate, and low in cost. Based on the preparation method, the structure and the properties of the composite light catalyst can be regulated and controlled through simply changing the conditions of reactions and heat treatments.

Description

technical field [0001] The invention relates to the field of composite photocatalyst preparation and photocatalytic oxidation degradation of pollutants, in particular to a visible light responsive BiVO 4 / TiO 2 / The preparation method of graphene ternary composite photocatalyst. Background technique [0002] While the rapid development of industry has enhanced our country's economic strength, it has also brought serious environmental pollution. For example, the organic dye pollutant wastewater accompanying the development of the textile industry has become one of the most serious pollution sources in industrial wastewater due to its complex composition, high toxicity and large discharge. In order to effectively treat these organic pollutants, researchers have developed a variety of efficient degradation technologies such as biological methods and membrane methods. Among them, TiO 2 The representative heterogeneous photocatalysis has attracted widespread attention due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22
CPCB01J23/002B01J23/22B01J37/16B01J2523/00B01J35/393B01J35/399B01J35/39B01J2523/47B01J2523/54B01J2523/55
Inventor 张雪杨吴礼光王挺庄仁哲陶立铭
Owner ZHEJIANG GONGSHANG UNIVERSITY
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