Bismuth molybdate photocatalyst preparation method

Abstract

The invention discloses a bismuth molybdate photocatalyst preparation method. According to the present invention, the nanometer photocatalyst is prepared with a surfactant polyethylene glycol as a template agent by adjusting the use amount of the template agent through a hydrothermal method; the prepared nanometer photocatalyst is characterized by using an X-ray diffractometer, a scanning electronmicroscope, an ultraviolet-visible diffuse reflection and specific surface meter, and the results show that the prepared bismuth molybdate is the mixture of cubic phase Bi3.64Mo0.36O6.55 and the monoclinic phase Bi2MoO6, and the morphology is the mixture of nano-sheets and nanoparticles; the photocatalytic degradation of rhodamine B and phenol by Bi3.64Mo0.36O6.55/Bi2MoO6 is studied under visiblelight irradiation, and the influence of the use amount of polyethylene glycol on the visible light activity during the preparation of the photocatalyst is investigated, wherein the results show thatthe photocatalytic activity is the best when the use amount of polyethylene glycol is 20 g.L<-1>; 2.5 h visible light irradiation can achieve the decoloration of 100% Rhodamine B, and the degradationrate of phenol after 12 h irradiation reaches 35.15%; and the hydrogen peroxide produced in the system is determined by using a DPD spectrophotometry method, and the tests with tert-butanol, potassiumiodide and other capture agents are supplemented, such that it is surmised that the catalytic mechanism mainly comprises hole oxidation and superoxide radical synergistic oxidation.

Description

technical field [0001] The invention relates to a preparation method of bismuth molybdate photocatalyst. Background technique [0002] Bismuth molybdate is a class of compounds with Oliveris layered features. For Bi with cubic phase structure 3.64 Mo 0.36 o 6.55 There are few studies, Wang et al. found that Bi 3.64 Mo 0.36 o 6.55 / Bi 2 MoO 6 The visible light catalytic activity of the catalyst is higher than that of pure Bi 2 MoO 6 or Bi 3.64 Mo 0.36 o 6.55 all good. The preparation methods of bismuth molybdate include solid phase method, molten salt method, ultrasonic reaction method, and hydrothermal method. The hydrothermal method is carried out in a sealed pressure vessel with water as a solvent under high temperature and high pressure conditions. Chemical reaction can obtain a catalyst with uniform solid particle size. However, when the solid particle size is small, its catalytic activity will be affected due to its high specific surface energy and easy a...

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Problems solved by technology

However, when the solid particle size is small, its catalytic activity w...