Novel N-riched crystalline covalent organic framework as a highly porous adsorbent for effective cadmium removal

One of the emerging issues in environmental remediation is the introduction of efficient adsorbents with high abundance active sites, to achieve quick uptake and high capacity for the contaminants such as cadmium. In this work, we explain how N-riched crystalline covalent organic framework (COF) which was prepared through the condensation of 2,4,6-tris(hydrazino)-1,3,5-triazine and 2,4,6-tris(p-formylphenoxy)-1,3,5-triazine serves as an ideal adsorbent for removing cadmium from aqueous solutions. More significantly, results demonstrated the adsorption isotherm is in consistent with the Langmuir model with high correlation coefficients of 0.9999 and the adsorption kinetic followed by the pseudo-second order model. Also, the result of the Langmuir constant (KL) for N-riched crystalline COF was found about of 0.39 which is related to the impressive performance in the adsorption of cadmium. Moreover, COF was characterized by XRD, TEM, BET, FE-SEM, TGA, FT-IR, CHN, and Raman spectroscopy.