NiO/WO3 photocatalyst with hierarchical nanostructure, and preparation method and application thereof

Abstract

The invention relates to a NiO/WO3 photocatalyst with a hierarchical nanostructure, and a preparation method and an application thereof. The preparation method comprises the following steps: dissolving a nickel salt and a tungsten salt in a mixed solvent of water and an organic solvent, then adding a polymer binder, and uniformly mixing to obtain a spinning solution; carrying out electrostatic spinning on the spinning solution to obtain a precursor fiber net; calcining the precursor fiber net to obtain the NiO/WO3 photocatalyst with the hierarchical nanostructure, wherein in terms of the molarweight of nickel atoms and tungsten atoms, the molar ratio of the nickel salt to the tungsten salt is (0.2-1.5): 1; and the calcining condition is that the temperature is kept at 400-900 DEG C for 1h or more. NiO is added as a cocatalyst, and the NiO/WO3 photocatalyst with the hierarchical nanostructure is prepared by adopting electrostatic spinning and calcining processes, so that the photocatalytic efficiency of the catalyst is remarkably improved, the microstructure of the catalyst is improved, and the catalyst is of a self-supported moss cluster nanostructure and is convenient to recycle.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a multilevel nanostructure NiO / WO 3 Photocatalyst and its preparation method and application. Background technique [0002] Tungsten trioxide WO 3 It is a cheap and stable transition metal oxide with a low band gap (about 2.6-2.7eV) and high solar light absorption efficiency. It has high activity in photocatalytic degradation of organic matter under visible light, especially for diazo Dye degradation shows remarkable catalytic ability and is a promising n-type semiconductor photocatalyst after TiO2. But in the absence of cocatalyst, WO 3 exhibited a lower photodegradation rate of organic matter, while traditional WO 3 The catalyst is in the form of powder or discrete fibers without a self-supporting structure, which is difficult to recycle and will cause secondary pollution. In order to solve the above problems, the patent application CN107460562B introduced co-catalyst and ele...

AI Technical Summary

Problems solved by technology

But in the absence of cocatalyst, WO 3 exhibited a lower photodegradation rate of organic matter, while traditional WO 3 The catalyst is in the form of powder or discrete fibers, without a self-supporting structure, difficult to recycle, and will cause secondary pollution

In order to solve the above problems, the patent application CN107460562B introduced co-catalyst and electrospinning process, and WO 3 Mixed with copper salt, the nanofibrous web with high specific surface area is prepared by electrospinning process. Although this technology improves the catalytic efficiency to a certain extent and realizes self-supporting, the improvement of catalytic efficiency is limited, and it still cannot meet the growing demand. High-tech requirements, but also unable to meet increasingly stringent environmental protection requirements

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