Facile synthesis, topological study, and adsorption properties of a novel Co (II)-based coordination polymer for adsorptive removal of methylene blue and methyl orange dyes

CP1 explores the possibility of better adsorbent for the efficient adsorptive removal of organic hazardous (MB and MO) dyes from textile wastewater. Adsorption efficiency of CP1 was compared with two natural adsorbent sawdust and rice husk. The non-covalent contacts and hydrogen bonding are responsible for high adsorption efficiency between the coordination polymer (CP1) and dye structure. CP1 exhibits a high adsorption rate and adsorption capacity to proven better adsorbent as compare to natural adsorbent (sawdust, rice husk). [Display omitted] In this work, a 2D coordination polymer, [Co2(μ-HCOO)2(NC)2(HIPA)]⋅2H2O)n (CP1) has been reported as an efficient adsorbent for the removal of organic hazardous dyes methylene blue (MB) and methyl orange (MO) from the aqueous phase. The structure of CP1 was extensively established by diffraction (single crystal-XRD and powder-XRD), thermal (TGA), and spectroscopic (FTIR) techniques. The scanning electron microscopic (SEM) images of CP1 reveal the surface topography. The specific surface area, porosity, and pore distribution analysis were achieved by using a BET analyzer. The topological study of CP1 shows the hcb type of underlying net topology. CP1 exhibits appreciable adsorption efficiency towards MB dye at neutral pH and room temperature. Moreover, the presence of an intricate array of non-covalent interactions such as π-π and hydrogen-bonding plays a pivotal role in the adsorption of both the dyes over CP1. Kinetic studies of adsorption suggest the pseudo-second-order reaction. The adsorption efficiency of CP1 was also compared with two natural adsorbents (sawdust and rice husk) which show CP1 as a superior adsorbent for MB and MO dyes adsorption from the aqueous phase.