Third International Conference on Advances in Bio-Informatics and Environmental Engineering - ICABEE 2015
Author(s) : JAE-KYU YANG, JANARDHAN REDDY KODURU, LAKSHMI PRASANNA LINGMADINNE, YOON-YOUNG CHANG, YU-LIM CHOI
The synthesized rGONF was characterized using X-ray diffraction (XRD), Fourier transform-infrared resonance (FT–IR), and X-ray photoelectron (XPS) spectroscopes. The morphology, the surface area and pore volume of GONF was evaluated by scanning electron microscopy (SEM) and BET analysis, respectively. rGONF was successfully used for the removal of U(VI) by batch adsorption techniques. Batch kinetics studies revealed the sorption of U(VI) onto rGONF was well described by pseudo-second-order equation. The sorption equilibrium data of U(VI) was well tune to the Langmuir isotherm model than the Freundlich and Temkin’s isotherm models. Hence, the sorption of U(VI) onto rGONF occurred through monolayer chemisorptions on homogeneous surface of rGONF. The maximum adsorption capacities (Qmax) of the rGONF for U(VI) is 200 mg/g. Thermodynamic studies reveal that the sorption was increased as increase temperature from 298 to 328 K, indicates the chemisorptions. The overall obtained results demonstrated that the rGONF as an effective sorbent for U(VI) removal from aqueous acidic solutions.