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

Abstract

The invention discloses a bismuth vanadate nanowire-graphene photocatalyst preparation method. The method includes: proportionally mixing bismuth salt, ammonium metavanadate and oxalate dihydrate into distilled water, and ultrasonically mixing to obtain mixed liquid; adding graphene oxide into the mixed liquid, and ultrasonically mixing to obtain a precursor; finally transferring the precursor into a high-pressure reaction kettle with a substrate to realize hydrothermal reaction, and cleaning and drying the product loading substrate after reaction is finished, so that a bismuth vanadate nanowire-graphene photocatalyst is obtained. The bismuth vanadate nanowire-graphene photocatalyst preparation method is technically simple in preparation, mild in reaction condition and short in reaction time, prepared bismuth vanadate nanowires and graphene can be closely contacted and compounded, separation of photo-induced electron holes is benefited, and accordingly photocatalysis efficiency is improved. The method is a high visible light activity photocatalyst preparation method low in production cost, simple and feasible.

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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