PREPARATION AND DEVELOPMENT OF ADSORBENT CARBON FROM ACACIA FARNESIANA FOR DEFLUORIDATION
|Y.Hanumantharao1, Medikondu Kishore2*, K.Ravindhranath3
|Corresponding Author: ,E-mail:[email protected]|
Batch adsorption dynamics and equilibrium studies for the removal of Fluoride ions from aqueous solution using indigenously prepared Acacia farnesiana carbon (AFC), has been carried out under various experimental conditions at room temperature (30±10C). Results found that percentage removal of Fluoride (F-) ions is increased with the decrease in initial concentration and is increased with increase in contact time initially and after 40-45 minutes, the % removal is found to be almost constant. Adsorption is highly pH sensitive and optimum pH range for appreciable or maximum adsorption of F- ion is found to be 6.5-7, with maximum absorption around 6.9. Adsorption data are modeled with isotherms and the different kinetic equations. Kinetics of adsorption is observed to be second order with intraparticle diffusion as one of the rate determining steps. The interactions of the adsorbent with Fluoride samples are characterized by making surface studies using X-ray Photo Electron Spectroscopy (XPS), Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM) and Energy Dispersive Spectrum (EDS) techniques. XPS and SEM-EDS data show evidence for Fluoride sorption on the AFC surface via inner-sphere complexation accompanying increased hydrogen bonding and surface oxidation. Removal of F- ions by indigenously prepared activated carbon, AFC, is found to be effective and hence AFC could be employed as an alternative adsorbent to the Commercial Activated Carbon (CAC) for water treatment for the removal of Fluoride ions.