Preparation method of graphite-phase carbon nitride with large specific surface area

Abstract

The invention belongs to the field of visible light catalytic materials, and particularly relates to a method for preparing a large-specific-surface-area graphite-phase carbon nitride material by utilizing a low-melting-point precursor and carrying out low-temperature heat treatment on the precursor in a roasting process. The preparation method comprises the following steps: (1) putting a nitrogen-containing precursor into a three-necked flask, putting the three-necked flask filled with the nitrogen-containing precursor into an oil bath pot after the temperature of the oil bath pot reaches themelting point of the nitrogen-containing precursor, and heating and stirring to enable the nitrogen-containing precursor to be in a molten state; (2) heating to keep a molten state, taking out the three-neck flask, and cooling and crystallizing the nitrogen-containing precursor at the molten state at room temperature; and (3) grinding the crystallized nitrogen-containing precursor into powder, putting the powder into a crucible, putting the crucible into a muffle furnace, carrying out programmed heating, and roasting in an air atmosphere to obtain a target product. The method has the advantages of simple process, environmental protection, low cost, high purity of the target product, and high catalytic performance.

Description

Technical field [0001] The invention belongs to the field of visible light catalytic materials, and specifically relates to a method for preparing a graphite phase carbon nitride material with a large specific surface area by using a precursor with a low melting point and low-temperature heat treatment of the precursor during a roasting process. Background technique [0002] At present, human society is facing the two thorny problems of environmental pollution and energy crisis. A lot of research has been devoted to the development of green and efficient semiconductor photocatalysts, which are used to photocatalyze the decomposition of water to produce hydrogen and degrade pollutants in water and gas to solve Environmental energy issues. Among them, the core of visible light catalysis technology is to explore and develop a green-friendly, cheap and easy-to-obtain visible light catalyst with high efficiency and excellent performance. [0003] In recent years, graphite phase carbon ...

AI Technical Summary

Problems solved by technology

But the technology requires HF, NH 4 HF 2 Etching with other template agents, the process is complex and volatile and corrosive HF, NH 4 HF 2 Templating agents also do not meet the requirements of green chemistry

The soft stencil agent mainly synthesizes the ordered mesoporous graphite phase carbon nitride by the self-assembly method of the surfactant, which emphasizes the chemical matching between the organic phase and the inorganic phase, and the specific surface area of ​​the prepared porous graphite phase carbon nitride is 84m 2 / g, although this method is simple to operate, but due to g-C 3 N 4 The CN structure will extend at high temperature, g-C 3 N 4 The condensation temperature of the soft template is obviously higher than the decomposition temperature of the soft template, and the premature removal of the soft template will cause the pores to close, and the improvement of the specific surface area is limited.

However, like using concentrated sulfuric acid or concentrated hydrochloric acid for precursor pretreatment, although a porous graphite phase carbon nitride with a large specific surface area is obtained, the use of concentrated acid will still cause certain safety hazards.

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