Development of triaminotriazine functionalized graphene oxide capped chitosan porous composite beads for nutrients remediation towards water purification

The porous, definite and nitrogen rich triaminotriazine (TAT) grafted graphene oxide (GO) known as TATGO composite was developed for nutrients (NO3- and PO43-) retention. Additionally, the structural property of TATGO composite was improved with the use of chitosan (CS) to produce easily separable TATGO@CS hybrid beads which possess the significant NO3- and PO43- adsorption capacities of 58.46 and 61.38 mg/g respectively than their individual materials. The instrumentations such as SEM, TGA, MR, EDAX, XRD and BET studies were executed for adsorbents. The optimization of the parameters accountable for adsorption process was performed in batch scale. The effect of isotherms (Langmuir, Freundlich and Dubinin-Radushkevich (D-R)), kinetics (pseudo-first/second order and partide/intraparticle diffusion) and thermodynamic parameters (Delta G degrees, Delta N degrees and Delta S degrees) of the adsorption was explored. The removal mechanism of TATGO@CS hybrid beads was to be electrostatic attraction on NO3- and PO43-. The field applicability and reuse of TATGO@CS hybrid beads was also inspected. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The TATGO composite, with improved structural properties through the addition of chitosan, demonstrated significant adsorption capacities for NO3- and PO43-. Various instrumental analyses were conducted, along with optimization of parameters and exploration of isotherms, kinetics, and thermodynamic parameters. The removal mechanism of electrostatic attraction on NO3- and PO43- was identified in TATGO@CS hybrid beads.