Cobalt selenide, graphite and carbon nitride composite material and preparation method and application thereof

Abstract

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a cobalt selenide, graphite and carbon nitride composite material and a preparation method and application thereof. Co<0.85>Se is formed through hydrothermal treatment, and graphite carbon nitride (g-C3N4) is formed through calcination; and Co<0.85>Se and g-C3N4 are dispersed into deionized water, then ultrasonic treatment is conducted, washing and drying are conducted, and finally calcining is conducted to obtain the Co<0.85>Se / g-C3N4 composite material. The cobalt selenide, graphite and carbon nitride composite photocatalytic material is synthesized through simple hydrothermal ultrasonic calcination, the preparation raw materials are low in price, precious metal and heavy metal polluting the environment are not contained, the composite photocatalytic material is used for efficient photocatalytic decomposition of water under visible light to prepare hydrogen, and the hydrogen is high-heat-energy, pollution-free and renewable energy.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a cobalt selenide graphite carbon nitride composite material and a preparation method thereof and the photocatalytic decomposition of water under visible light to produce hydrogen. Background technique [0002] Energy shortage and environmental problems are becoming more and more serious in today's world, and the development of clean energy is imminent. Hydrogen energy is a very good clean energy. It will not produce any pollutants in the process of consumption. It has high energy density and is an ideal choice. However, the current situation is that the industrial hydrogen production technology is far from the ideal requirements, not only high energy consumption, but also low efficiency. The development of photocatalytic technology and the use of solar energy to split water to generate hydrogen is an important way for clean and sustainable hydrogen ...

AI Technical Summary

Problems solved by technology

[0004] However, there are some problems in the actual synthesis and preparation, such as the use of rare and expensive precious metals as raw materials, strict and complex conditions in the synthesis process, and the production of substances that pollute the environment, etc.

Chinese patent CN106268874A discloses a kind of Ag / g-C 3 N 4 Composite film and its preparation method and application, high cost of raw materials

Chinese patent CN107715859A discloses a preparation method of a graphene perovskite composite photocatalytic hydrogen production catalyst. Weigh nitrate, tetrabutyl titanate and complexing agent and dissolve them in ethanol, add graphene, and stir until it becomes Dry gel, then roasted to remove organic matter and then vacuum calcined to obtain, the preparation process is complex, such as graphene preparation conditions are more difficult; Chinese patent CN108927222A discloses a preparation method of CdS-PAN / graphene composite nanofibers, the preparation is complicated, The reaction conditions are harsh and involve heavy metal sulfide CdS, which pollutes the environment

In addition, most of the current semiconductor catalysts are only active under ultraviolet light, and do not respond to visible light, and the main part of sunlight is visible light, so the utilization efficiency of sunlight is very low

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