Electrochemical removal of hexavalent chromium from wastewater using Platinum-Iron/Iron-carbon nanotubes and bipolar Electrodes

Abstract

Background: In recent decades, electrocoagulation (EC) has engrossed much attention as an environmental-friendly and effectiveness process. In addition, the EC process is a potential suitable way for treatment of wastewater with concern to costs and environment. The object of this study was electrochemical evaluation of chromium removal from industrial wastewater using Platinum and carbon nanotubes electrodes. Materials and Methods: The effect of key variables including pH (3–9), hexavalent chromium concentration (50–300 mg/l), supporting electrolyte (NaCl, KCl, Na2CO3 and KNO3) and its dosage, Oxidation-Reduction variations, sludge generation rate and current density (2–20 mA/cm2) was determined. Results: Based on experimental data, optimum conditions were determined in 20, 120 min, pH 3, NaCl 0.5% and 100 mg/L initial concentration of chromium. Conclusions: Removal of hexavalent chromium from the wastewater could be successfully performanced using Platinum-Iron/Iron-carbon nanotubes and bipolar Electrodes.

Keywords

• Electrochemical removal
• hexavalent chromium
• platinum electrode
• carbon nanotubes electrode.