Development of novel microporous guanazole complex for CO2 adsorption

Abstract

A novel complex, resulting from the synthesis of a guanazole ligand coordinated with Zn(II), has been successfully synthesized through an environmentally friendly method and carefully characterized using a combination of analytical techniques, including Fourier-transform infrared (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), N2 adsorption–desorption, scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). The Brunauer–Emmett–Teller surface (BET) surface area of the guanazole complex is determined to be approximately 407.50 m2/g, featuring pore diameters and pore volume of 1.84 nm and 0.187 cm3/g, respectively. The emergence of micropores in the guanazole complex significantly enhances its CO2 adsorption capacity. The maximum CO2 adsorption capacity of the complex is observed to be 3.18, 2.08, and 1.51 mmol/g at temperatures of 273, 298, and 313 K, respectively. This study presents novel prospects for the controlled synthesis of nitrogen-rich complexes and their potential application in CO2 capture.