Method for preparing pucherite-graphene composite photocatalyst

A graphene composite and photocatalyst technology, which is applied in the field of photocatalytic degradation of organic pollutants, can solve problems such as the inability to ensure the tight connection between bismuth vanadate and graphene, limited improvement in photocatalytic performance, and difficulty in separating photogenerated carriers. Improve photocatalytic performance, facilitate transportation, and have strong adsorption capacity

Active Publication Date: 2014-05-21
ZHEJIANG UNIV
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Problems solved by technology

However, bismuth vanadate as a photocatalyst also faces some problems: bismuth vanadate grown by ordinary methods, due to the excessive growth rate, obtains irregular particles with large grain size, poor adsorption capacity, and it is difficult to generate photogenerated carriers. Separation, electron-hole pairs are easy to recombine, which makes the photocatalytic efficiency low; the recombination of bismuth vanadate and graphene is an effective modification technology, which uses the excellent electron transport performance of graphene to achieve effective separation of photogenerated carriers. improve the photocatalytic performance of the material
However, the physical loading formed by simple mixing cannot guarantee the tight connection between bismuth vanadate and graphene, so the photocatalytic performance of bismuth vanadate-graphene composite photocatalysts obtained by ordinary composite methods is limited.

Method used

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  • Method for preparing pucherite-graphene composite photocatalyst
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  • Method for preparing pucherite-graphene composite photocatalyst

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preparation example Construction

[0025] combine figure 1 , the preparation method concrete steps of acid bismuth-graphene composite photocatalyst among the present invention are as follows:

[0026] 1) Preparation of uniform porous olive-shaped bismuth vanadate powder: Bismuth nitrate and ammonium metavanadate are used as raw materials, and a mixture of water and ethylene glycol with a volume ratio of 2:1 is used as a solvent, prepared by an organic solvent-hydrothermal method Uniformly dispersed porous olive-like bismuth vanadate powder;

[0027] 2) Prepare graphene oxide colloidal suspension: use graphite powder as raw material, prepare graphene oxide by Hume method, wash graphene oxide with water, dry after alcohol washing, and disperse it in ethanol solution after grinding;

[0028] 3) Pretreatment of bismuth vanadate powder: ultrasonically disperse bismuth vanadate powder annealed at 300-500 °C in absolute ethanol, add silane coupling agent, and continue stirring at room temperature. Finally, the treate...

Embodiment 1

[0032] Step 1: 1) 1.458 g (3 mmol) Bi(NO 3 ) 3 ·5H 2 O and 0.351 g (3 mmol) NH 4 VO 3 respectively dissolved in 4 mol / L HNO 3 solution (50 mL) and 2 mol / L NaOH solution (50 mL); 2) Add 25 mL of ethylene glycol to each of the above two solutions, stir well, and add NH 4 VO 3 The solution was slowly added dropwise to the Bi(NO 3 ) 3 3) adjust the pH to 1, transfer it to a polytetrafluoroethylene hydrothermal kettle after fully stirring, and conduct a hydrothermal reaction at 180 °C for 12 hours. The final precipitate is washed with water and alcohol, and then dried. figure 2 The SEM shows that the bismuth vanadate particles have a regular shape, a porous structure, and a particle size of 2-3 um; image 3 The XRD pattern of the machine shows that the bismuth vanadate prepared by the machine is a monoclinic scheelite phase with high crystallinity and the highest catalytic activity, corresponding to the standard card (JCPDS NO.83-1699).

[0033] The second step: 1) Use gr...

Embodiment 2

[0037] Step 1: 1) 1.458 g (3 mmol) Bi(NO 3 ) 3·5H 2 O and 0.351 g (3 mmol) NH 4 VO 3 respectively dissolved in 4 mol / L HNO 3 solution (50 mL) and 2 mol / L NaOH solution (50 mL); 2) Add 25 mL of ethylene glycol to each of the above two solutions, stir well, and add NH 4 VO 3 The solution was slowly added dropwise to the Bi(NO 3 ) 3 3) adjust the pH to 1, transfer it to a polytetrafluoroethylene hydrothermal kettle after fully stirring, and conduct a hydrothermal reaction at 160 °C for 12 hours. The final precipitate is washed with water and alcohol, and then dried.

[0038] The second step: 1) Use graphene as raw material to prepare graphene oxide by the Hume method; 2) Grind the graphene after pickling, alcohol washing and drying, and disperse it in absolute ethanol to obtain the concentration 0.1 mg / mL.

[0039] The third step: 1) Anneal the bismuth vanadate powder obtained in the first step at 300 °C in the atmosphere for 3 hours; 2) Disperse 0.5 g of the annealed bi...

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Abstract

The invention discloses a method for preparing a pucherite-graphene composite photocatalyst. The method comprises the following steps: 1, preparing uniform porous olive-shaped pucherite powder from bismuth nitrate and ammonium metavanadate serving as raw materials by using an organic solvent-hydrothermal method; 2, preparing a graphene oxide colloid suspension; 3, pretreating the pucherite powder by adopting a silane coupling agent; and 4, simultaneously reducing the graphene oxide and compounding pucherite and grapheme by utilizing ultraviolet irradiation. In order to solve the problems that a conventional photocatalyst is low in visible light utilization rate and a single pucherite catalyst photon-generated carrier is easy to have compounding limitation on photocatalysis efficiency, the invention provides a high visible light activity photocatalyst preparation method which is low in production cost, simple and feasible. The pucherite-graphene composite photocatalyst prepared by adopting the method has good properties in the aspect of organic pollutant photocatalysis degradation, and has wide application prospects in the field of environment friendliness.

Description

technical field [0001] The invention relates to the field of photocatalytic degradation of organic pollutants, in particular to the preparation of a composite photocatalyst with high visible light activity through modification treatment with a silane coupling agent and ultraviolet light. Background technique [0002] Environmental pollution is an increasingly serious problem facing mankind, and it is related to the sustainable development of human society. Toxic organic pollutants represented by industrial wastewater have seriously threatened human health and existence. Semiconductor photocatalytic degradation of organic pollutants is a promising technology with the advantages of low energy consumption, no secondary pollution, green simplicity and wide applicability. The traditional photocatalytic technology mainly uses titanium dioxide as a photocatalyst, but due to the large band gap of titanium dioxide, it can only absorb the ultraviolet light part of the solar spectrum,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J37/34
Inventor 吕斌汪银洲叶志镇
Owner ZHEJIANG UNIV
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