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

• Published in: Environmental science water research & technology 2020-03, Vol.6 (3), p.851-863
• Main Authors: Periyasamy, Soodamani, Naushad, Mu, Viswanathan, Natrayasamy
• Format: Article
• Language: English
• Subjects: Alginates; Alginic acid; Beads; Biomedical materials; Body organs; Carcinogens; Chromium; Composite materials; Drinking water; Fabrication; Groundwater; Groundwater pollution; Hexavalent chromium; Mapping; Organs; Oxidation; Oxidizing agents; Physicochemical processes; Physicochemical properties; Polymers; Porous materials; Removal; Seaweed meal; Sodium hydroxide; Soil contamination; Sorbents; Sorption; Sustainable materials; Thermodynamic equilibrium; Triazine; Water pollution; Water treatment; X ray photoelectron spectroscopy
• ISSN: 2053-1400; 2053-1419
• DOI: 10.1039/c9ew01096c

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 m 2 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. Covalent organic polymers (COPs) possesses high surface area and porosity. The synthesised triazine COP blended alginate (TCOP@Alg) biocomposite beads used for Cr( vi ) removal. TCOP@Alg beads reduces field chromium water to below tolerance limit.