尽管通过固相反应可以很好的制备出氮化碳粉末，但是这种方法需要在高温高压

Although carbon nitride powder can be well prepared by solid-phase reaction, this method needs to be carried out under high temperature and high pressure, and the requirements on instruments and reaction conditions are very strict. Therefore, some researchers have improved the traditional solid-phase method to synthesize carbon nitride through a solid-phase reaction at a lower temperature and pressure. Gao et al. Used melamine as a nitrogen-containing precursor, acid-pretreated it, and then heat-treated it at 350 ° C in an air atmosphere to obtain a hollow tube g-C3N4 material. This method is simple and easy. The g-C3N4 nanotube has a length of millimeters, the diameter of the nanotube and the thickness of the tube wall are 300-500 nm and 20 nm, respectively, and have good fluorescence.

Although carbon nitride powders should be well prepared by sequestration, this method needs to be done at high temperatures and high pressures and the instrument and reaction conditions are demanding. As a result, some researchers have improved the traditional solid phase method, and at lower temperatures and pressures, carbon nitride should be synthesized by fixing the opposite. Gao and so on use melamine as a nitrogen-containing precursor, and acid pre-treatment, and then in the air atmosphere at 350 degrees C heating treatment to obtain the hollow tube g-C3N4 material, the method is simple and easy. The g-C3N4 nanotube length of up to millimeter, nanotube diameter and pipe wall thickness of 300-500nm and 20nm, respectively, with good fluorescence.

Although carbon nitride powder can be well prepared by solid-state reaction, this method needs to be carried out under high temperature and pressure, and the requirements of instrument and reaction conditions are very strict. Therefore, some researchers have improved the traditional solid-phase method to synthesize carbon nitride by solid-phase reaction at low temperature and pressure. Gao et al. Used melamine as nitrogen-containing precursor and pretreated it with acid, then heated it at 350 ℃ in air atmosphere to obtain hollow tube g-c3n4. This method is simple and easy. The length of the g-c3n4 nanotubes is millimeter. The diameter and wall thickness of the nanotubes are 300-500nm and 20nm, respectively.<br>