Molybdenum dioxide nanosheet/graphene-like carbon nitride photocatalytic material with visible-light response as well as preparation and application thereof

Abstract

The invention relates to a preparation method of visible light responsive photocatalysts, in particular to a molybdenum dioxide nanosheet / graphene-like carbon nitride composite photocatalytic materialwhich can serve as an environment function material to be applied to the field of photocatalytic environment control. The composite photocatalyst is prepared by compounding molybdenum dioxide nanosheets (MoO2) and graphene-like carbon nitride (GL-C3N4) of a certain mass. The preparation method specifically comprises the following preparation steps: adding the prepared MoO2 and GL-C3N4 into ethylene glycol for performing stirred ultrasonic treatment, transferring the mixture into a reactor, and maintaining the temperature in a drying oven of 160-200 DEG C for 8-16 hours; finally, performing centrifugal washing and drying, so as to obtain the molybdenum dioxide nanosheet / graphene-like carbon nitride (MoO2 / GL-C3N4) composite photocatalyst. Experiments prove that compare with monomer carbon nitride, the composite photocatalyst has the advantage that the photocatalytic performance is obviously improved. In the preparation method provided by the invention, the raw materials are cheap, the process flow is simple, the reaction is mild, the whole synthetic process is green and environmental-friendly, the product cost is effectively reduced, and the composite photocatalyst has extremely high application prospects and application value in the aspects such as sewage treatment and the like.

Description

technical field [0001] The invention relates to a preparation method of a visible light-responsive molybdenum dioxide / graphene-like carbon nitride composite photocatalyst, which can be used in the technical field of photocatalytic degradation of pollutants. Background technique [0002] The contradiction between the two major problems of energy shortage and environmental pollution and the sustainable development of society has become increasingly prominent. As an efficient, safe and environmentally friendly environmental purification technology, photocatalytic technology has been recognized by the international academic community for its improvement of indoor air quality. It has aroused widespread concern of scientists in environmental pollution control and other aspects. However, many photocatalytic materials have problems such as large band gap and only ultraviolet light response, which make them unable to be applied on a large scale. [0003] Graphite carbon nitride (g-C...

AI Technical Summary

Problems solved by technology

However, many photocatalytic materials have problems such as large band gap and only ultraviolet light response, which make them unable to be applied on a large scale. Therefore, new photocatalysts with high efficiency visible light response have gradually become a research hotspot

[0003] Graphite carbon nitride (g-C3N4) has a layered structure like graphite, has a large conjugated π bond, and has good chemical stability. Due to its suitable band gap, it is only 2.70 eV, and has non Metallicity, stability, and non-toxicity have quickly become a research hotspot in the field of photocatalysis; g-C3N4 has good application prospects as a high-temperature-resistant, non-metallic, and non-toxic catalyst, but the study of its properties found that a single Bulk g-C3N4 has a low utilization rate of light, and the electron-hole recombination rate is high under light conditions

Inspired by the research on graphene, if g-C3N4 can be treated like graphene, and exfoliated to obtain a single-layer or few-layer graphene-like structure carbon nitride two-dimensional material, it may be possible to reduce its photogenerated electrons and space. recombination rate

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