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

Abstract

The invention relates to a multi-morphologic Ho/BiVO4 composite photocatalyst, and a preparation method and an application thereof. The main component of the multi-morphologic Ho/BiVO4 composite photocatalyst is BiVO4, the BiVO4 has a tetragonal zircon phase structure, and the crystal lattice of the BiVO4 contains Ho<3+>. The preparation method comprises the following steps: respectively dissolving bismuth nitrate pentahydrate and ammonium metavanadate in water to obtain a bismuth salt solution and a vanadium salt solution, adding the vanadium salt solution to the bismuth salt solution according to a molar ratio of Bi to V of 1:1 to obtain a mixed solution, adjusting the pH value of the mixed solution to 8, adding holmium nitrate hexahydrate according to a molar ratio of Ho to Bi of (2.04-13.64):100, and maintaining the temperature at 180DEG C unchanged for 40min under a power of 300W by using a microwave hydrothermal method to prepare Ho/BiVO4. The preparation method has the advantages of uniform heating, fast heating speed, mild reaction condition, simple process flow, shortened reaction time and increased work efficiency, and the synthesized multi-morphologic Ho/BiVO4 composite photocatalyst has a high photocatalytic activity and can be used for degrading 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...

AI Technical Summary

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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