A kind of preparation method of bismuth vanadate nanowire-graphene photocatalyst

Abstract

A method for preparing a bismuth vanadate nanowire-graphene composite photocatalyst. Bismuth salt, ammonium metavanadate, and oxalic acid dihydrate are dissolved in distilled water in a certain proportion, mixed ultrasonically to form a mixed solution, and then graphene oxide is added. Add to the above mixed liquid, ultrasonic mixing to obtain a precursor, and finally move the precursor into a high-pressure reactor containing a substrate for hydrothermal reaction. After the reaction is completed, the substrate loaded with the product is washed and dried to obtain the described A bismuth vanadate nanowire-graphene composite photocatalyst. The preparation process of the present invention is simple, the reaction conditions are mild and the reaction time is short. The prepared bismuth vanadate nanowires and graphene can be closely contacted and combined, which is beneficial to the separation of photogenerated electron holes, thereby improving the photocatalytic efficiency and providing a A low-cost, simple and easy preparation method for highly visible light active photocatalysts.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst, in particular to a method for preparing a bismuth vanadate nanowire-graphene photocatalyst, and belongs to the technical field of photocatalyst preparation. Background technique [0002] In recent years, with the rapid development of the global economy, the total amount of industrial waste gas, waste water and waste residue has continued to increase, and the production rate of domestic waste water has also continued to increase. Sewage purification has become the focus of global attention. Traditional waste water treatment methods mostly use physical adsorption. , chemical gasification, etc., but these methods are too inefficient and consume a lot of energy. As environmental problems become more and more serious, the energy crisis is becoming increasingly prominent. Using free solar energy for photocatalytic degradation of organic pollutants and decomposition of water to produce oxygen Mo...

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Problems solved by technology

However, these three methods are all hydrothermal methods, and their hydrothermal treatment time is longer and the temperature is higher

Yan et al. (Microwave-assisted in situsynthesis of reduced graphene oxide-BiVO 4 composite photocatalysts and their enhanced photocatalytic performance for the degradation of ciprofloxacin, Journal of Hazardous Materials 2013 ， 250, 106–114) prepared rGO / BiVO by microwave-assisted in situ growth 4 Composite photocatalyst, but the microwave generator of the microwave method is expensive, and the volume of the current microwave generator is too small, which limits the BiVO 4 Product output

Chinese Patent Publication No. CN104383910A, the publication date is March 4, 2015, and the title of the invention is "a preparation method of a bismuth vanadate / graphene composite photocatalyst with controllable particle size", adding graphene to the bismuth vanadate solution Bismuth vanadate particle-composite graphene composite is prepared. Although the photocatalyst has good catalytic performance, it needs to be treated at a high temperature of 400~500℃.

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