Synthesis of Bimetallic Fe-Ni nanoparticles and using them to improve electrochemical treatment of wastewater

 
 
Industrial wastewaters are hazardous to natural ecosystems and can pollute surface and groundwater. Management and treatment of wastewaters are important in order to preserve the environment. For this purpose, recently, combination of different methods are employed to meet the emission standards. Electrochemical method has been considered as a proper technique for treatment of various industrial wastewaters due to its environmental versatility and compatibility. Also, Zero-valent Fe nanoparticles are used as oxidizing, reducing and catalyst agents for removal of a wide range of pollutants. In this study, performance of a combination of electrocoagulation/electroflotation methods with Fe nanoparticles has been studied in a two-stage removal of Acid Red 14 and the parameters of nanoparticles concentration and duration of electrochemical method usage were optimized. Quality of the synthetized bimetallic Fe-Ni nanoparticles through chemical precipitation of iron salt with a strong reductant (sodium borohydride) was examined by XRD and SEM tests. The results showed that with the concentration of 0.3 gr/L Fe nanoparticles, dye and COD removal efficiencies of 100% were obtained for the wastewater that had been treated 90 min by electrochemical method. Electrochemical method is  advantageous due to simple operation whereas takes more time for complete removal of contaminants. Accordingly, the combined treatment by electrochemical and Fe nanoparticles methods can be utilized to provide higher qualities, and in load shocks.
Industrial wastewaters containing dyes are hazardous to natural ecosystems and can pollute surface and groundwater. Management and treatment of wastewaters are important in order to preserve the environment. For this purpose, recently, combinations of different methods are employed to meet the emission standards. Electrochemical method has been considered as a proper technique for treatment of various industrial wastewaters due to its environmental versatility and compatibility. Also, Zero-valent Fe nanoparticles are used as oxidizing, reducing and catalyst agents for removal of a wide range of pollutants. In this study, performance of a combination of electrocoagulation/ electroflotation with Fe nanoparticles has been studied in a two-stage removal of Acid Red 14 and the parameters of nanoparticles concentration and duration of electrochemical method usage were optimized. Quality of synthetized bimetallic Fe-Ni nanoparticles through chemical precipitation of iron salt with a strong reductant (sodium borohydride) was examined by XRD and SEM tests. The results showed that with the concentration of 0.3 gr/L Fe nanoparticles, dye and COD removal efficiencies of 100% were obtained for the wastewater that had been treated 90 min by electrochemical method. Electrochemical method has advantages such as simple operation whereas takes more time for complete removal of contaminants. Accordingly, the combined treatment by electrochemical and Fe nanoparticles methods can be utilized to provide higher qualities, and in load shocks.