Method for preparing g-C3N4 photocatalysts with different shapes

The invention relates to a method for preparing g-C3N4 photocatalysts with different shapes. The method comprises the following steps: adding three raw materials of melamine, urea and cyanuric acid to ethanol at a certain ratio; performing agitating, ultrasonic treatment, agitating again and drying so as to obtain a precursor, and then burning in a tube furnace, thereby finally preparing the g-C3N4 photocatalysts with different shapes. Compared with the prior art, the method has the advantage that the change of the shapes of the prepared g-C3N4 photocatalysts from a porous block body to blank pipe insetting to worm shape can be controlled by adjusting the proportion of the precursor. The prepared material is even and porous in structure and large in specific surface area, is beneficial to separation of photogenerated electron holes, and has greatly improved photocatalytic performance.