固相反应法通常选择三聚氰胺和三聚氰氯等具有三嗪环结构的化合物为前躯体，

The solid-phase reaction method usually selects a compound with a triazine ring structure such as melamine and melamine chloride as a precursor, and then adds a nitrogen-containing compound as a nitrogen source, and causes the two to react under higher temperature and pressure. Carbon nitride powder was obtained. In 2000, Khabashesku et al. Used cyanuric chloride as a precursor and lithium nitride as a nitrogen source. Under the protection of a nitrogen atmosphere, they reacted at 300-380 ° C for 0.5-4 hours to obtain an amorphous C3N4 product. In addition, they added melamine fluoride to the raw materials and changed the solid-phase reaction conditions to obtain a hollow spherical structure of amorphous C3N4 with a C / N ratio of 0.8. Zhang et al. Used melamine instead of lithium nitride to perform solid-phase reaction with melamine chloride under the conditions of 1-1.5GPa and 500-600 ℃, and successfully obtained g-C3N4 with better crystallinity.

The regrade method usually selects compounds with triamcinolone structure such as melamine and melamine chlorine as the former body, then adds a nitrogen-containing compound as a nitrogen source, and reacts at a higher temperature and pressure, and finally obtains carbon nitride powder. In 2000, Khabashesku and others used melamine chlorine as a precursor, lithium nitride as a nitrogen source, under the protection of the nitrogen atmosphere, in the nitrogen atmosphere of about 300-380 degrees C reaction 0.5-4 hours, obtained a fixed form of C3N4 products. In addition, they added melamine fluorine to the raw material, changed the fixed opposite condition, and obtained the amorphous C3N4 of the hollow ball structure, with a C/N ratio of 0.8. Zhang and so on to melamine instead of lithium nitride, in 1-1.5GPa, 500-600 degrees C conditions and melamine chlorine solid, successfully obtained a better crystallization of g-C3N4.

In the solid-phase reaction method, melamine and cyanuric chloride with triazine ring structure are usually selected as the precursor, and then a nitrogen-containing compound is added as the nitrogen source, and they react under high temperature and pressure to obtain carbon nitride powder. In 2000, khabashesku et al. Used cyanuric chloride as the precursor and lithium nitride as the nitrogen source. Under the protection of nitrogen atmosphere, they reacted at about 300-380 ℃ for 0.5-4 hours, and obtained the product of C3N4 without definite form. In addition, they added cyanuric fluoride to the raw materials, changed the solid-state reaction conditions, and obtained the amorphous C3N4 with hollow sphere structure, with a C / N ratio of 0.8. Zhang et al. Used melamine instead of lithium nitride to react with cyanuric chloride in solid state at 1-1.5gpa, 500-600 ℃, and successfully obtained g-c3n4 with good crystallinity.<br>