Options
Electro-enhanced adsorptive removal of ciprofloxacin from aqueous solution on graphite felt
Date Issued
01-10-2020
Author(s)
Divyapriya, Govindaraj
Mohanalakshmi, J.
Kumar, Keshav V.
Indian Institute of Technology, Madras
Abstract
In this study, enhanced electrosorption removal of ciprofloxacin is investigated using graphite felt electrodes. The effect of operating parameters like pH, applied voltage, electrolyte concentration, and initial concentration on the removal of ciprofloxacin and enhancement in adsorption capacity of graphite felt was studied. The adsorption isotherm and kinetics were studied. Cyclic voltammogram showed no significant redox peaks at the operated experimental conditions. The adsorption capacity was increased from 0.617 mg g-1at open circuit voltage to 1.915 mg g-1at 1.0 V and the corresponding pseudo first order kinetic rate constants were increased from 0.069 min-1to 0.111 min-1. The adsorption capacity and kinetics observed to be high at pH 3.0 and 10.0 compared to pH 7.0. The electrosorption process performance increased with increasing applied voltage (OCV to 1.5 V) and reduced at high electrolyte concentration (0.1-1.0 M Na2SO4). Experimental data was fitted to Langmuir and Freundlich adsorption isotherm models. The electrosorption results proposed that the adsorption rate and adsorptive capacity can be significantly enhanced by electrochemical polarization with the greater affinity derived between the charged ciprofloxacin species and graphite felt. Mechanism of electrosorption removal of ciprofloxacin at different pH is proposed based on the experimental observations.
Volume
8