Multi-morphologic Ho/BiVO4 composite photocatalyst, and preparation method and application thereof

Abstract

Multi-morphology Ho / BiVO4 composite photocatalyst and its preparation method and application. Its main component is BiVO4, which is a tetragonal zircon phase structure, and the crystal lattice of BiVO4 contains Ho3+. Dissolve bismuth nitrate pentahydrate and ammonium metavanadate in water to obtain a bismuth salt solution and a vanadium salt solution respectively. Add the vanadium salt solution to the bismuth salt solution to obtain a mixed solution according to a molar ratio of Bi to V of 1:1. Adjust the mixed solution The pH value is 8, then add holmium nitrate hexahydrate, the molar ratio of Ho to Bi is (2.04~13.64):100, and use microwave hydrothermal method to prepare Ho / BiVO4 at 180°C for 40 minutes with a power of 300W. The invention has uniform heating, fast heating speed, mild reaction conditions, and simple process flow, shortens the reaction time, and improves work efficiency. The synthesized multi-morphology Ho / BiVO4 composite photocatalyst has high photocatalytic activity and can be used for degradation. environmental pollutants.

Description

technical field [0001] The invention belongs to the field of functional materials, in particular to a multi-morphology Ho / BiVO 4 Composite photocatalyst and its preparation method and application. Background technique [0002] At present, human beings are faced with two major problems of energy and environment. With the depletion of fossil energy and the aggravation of environmental pollution caused by industrial production, it is a challenge for scientists all over the world to find new clean energy and effectively control environmental pollutants. However, the use of photocatalysis can effectively utilize solar energy and realize the process of photocatalytic degradation of organic dyes under mild conditions. Here, semiconductor photocatalysts are the core of this process. [0003] BiVO 4 It is a semiconductor photocatalyst material that has been studied more in recent years. It has a high ability to respond to visible light to catalyze the decomposition of water and de...

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Problems solved by technology

But since BiVO 4 The conduction band position of BiVO is lower than the reduction potential of hydrogen, which cannot achieve the purpose of reducing water to produce hydrogen, which limits its application in photolysis of water to produce hydrogen; and BiVO 4 The electrons and holes generated by light excitation are easy to recombine, and the photocatalytic performance is still limited, so many scholars have begun to study the BiVO 4 The photocatalytic performance of the photocatalyst is modified to improve the effect of photocatalytic degradation of pollutants, and finally it is widely used in actual life production

Doping improves BiVO 4 The photocatalytic reaction efficiency and selectivity of BiVO 4 The method of doping modification is mostly the impregnation method, that is, the pure phase BiVO is prepared by the traditional solid-state reaction method, chemical co-precipitation method, sol-gel method and hydrothermal method. 4 Finally, select the appropriate metal source and dope it by impregnation method, which has many processes and complicated process

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