Combined Anodic Oxidation and Hydroxyapatite-Magntite Composites Adsorption Treatments for Aqueous Solution Containing Antibiotic Ciprofloxacin- a Novel Approach

Tuesday, 30 May 2017: 11:20
Marlborough A (Hilton New Orleans Riverside)
G. Sivarasan, D. Prabha (Bharathiar University), S. Sabarathinam (Shantou University), and C. M. Haneesh (Bharathiar University)
In this study, electrochemical degradation of the widely used antibiotic Ciprofloxacin (CIP) was investigated using commercial mixed metal oxide anodes (RuO2/IrO2/TaO2 coated Ti- mesh). Here, one of the secondary inorganic by-products namely, Fluoride ions (F-), was removed from the aqueous medium by means of an adsorption process using Fe2O3/HAp nano composites. A general hydrothermal process was used to prepare Fe3O4 nanoparticles dispersed on the hydroxyapatite nano rods. The obtained nano composites were characterized by XRD, FESEM, BET, VSM and FTIR analysis. The synthesized Fe3O4/HAp Nano composites were further explored to study the maximum removal of F- (99.9%) by optimizing various conditions. The effects of the oxidative potential, current density, initial concentration of CIP, electrolysis time, electrolyte concentration and initial pH on the formation and evolution of F- ions released to the medium during the process were evaluated. The degradation efficiency of CIP was further confirmed by HPLC and GC-MS analysis. At the optimum conditions (current density = 5 mA/cm2, initial CIP concentration = 5mg/L, pH = 3.4, electrode gap = 1.5 cm, and electrolyte concentration = 0.1M Na2SO4), after 30 min, the removals of CIP concentration, COD and TOC were about 99.9%, 75.4%, and 85.6%, respectively. The reaction exhibited a pseudo first-order kinetics model. The results showed that combined electrochemical oxidation, using a RuO2/IrO2/TaO2 coated Ti-mesh as anodes along with adsorption, using adsorbent Fe2O3/n-Hap composites were highly effective for the degradation of CIP.