Investigation of Adsorption of Heavy Metal Ions on C3N4 Nanosheets by Batch and Microscopic Methods.

This paper mainly studies the adsorption of C₃N₄ on a series of heavy metals and focuses on the adsorption performance of C₃N₄ on Nd and Th. The main conclusions are as follows: Through the use of the thermal stripping method and melamine as the raw material, C₃N₄ was obtained at a lower cost, with superior adsorption performance. Through SEM-EDS, TEM, and other characterization analyses, the results show that C₃N₄ has a clear multilayer sheet structure, and the surface of the material is more uniformly dispersed. The maximum adsorption capacity of C₃N₄ for Th is 86.6 mg.g^-1, and the maximum adsorption capacity for Nd is 60.1 mg.g^-1. The kinetic model is also used for fitting, and the results showed that the kinetic of the adsorption was in line with the pseudo-second-order model, indicating that the adsorption was chemical interaction. After C₃N₄ adsorbed heavy metal elements, it was characterized by SEM-EDS, TEM, UHRTEM, and AFM. The results showed that a variety of heavy metal ions can be adsorbed by C₃N₄, which proved that C₃N₄ has good adsorption performance. Due to factors such as metal particle size, the adsorption of C₃N₄ on heavy metal elements is different. [ABSTRACT FROM AUTHOR]