Hydrothermal fabrication of triazine-functionalized covalent organic polymer enfolded alginate biocomposite beads for Cr(vi) removal from water

Abstract

Hexavalent chromium [Cr(VI)] is highly water soluble and its compounds act as strong oxidizing agent that easily react with human organs and lead to various carcinogenic diseases. Cr(VI) removal is very important to provide safe drinking water. Hence, this research work targets Cr(VI) removal using a sustainable material namely triazine-assisted micro-porous covalent organic polymer enfolded alginate biocomposite beads (TCOP@Alg) synthesized by hydrothermal method. To determine the physicochemical properties of TCOP@Alg biocomposite beads, FTIR, PXRD, SEM, XPS, EDAX, BET and mapping analyses were scrutinized. The surface area of TCOP@Alg biocomposite beads was found to be 292 m² g⁻¹, showing an excellent sorption capacity (SC) of 42.89 mg g⁻¹. The sorption data of Cr(VI) removal onto TCOP@Alg biocomposite beads is well correlated with various isotherms and kinetic models. The thermodynamic equilibrium values indicated that Cr(VI) sorption onto TCOP@Alg biocomposite beads was endothermic and spontaneous. In addition, TCOP@Alg hybrid biocomposite beads can be efficiently regenerated up to three cycles using 0.1 M NaOH. TCOP@Alg biocomposite beads can be employed as potential sorbent for Cr(VI) removal from Cr(VI) contaminated ground water.