Degradation and Treatment of Azo Reactive Dyes using Iron Oxide Nanoparticles (P-0796) (MFN 5794)

Abstract

Industries are the major sources of pollution in all environments. Typical dyeing process, there are estimated 10-20% of dyes entering the environment through wastewater. Even a very low concentration of these dyes in water is undesirable. These effluents must be treated before they are released into the surrounding environment. Nanoparticles are becoming key components in a wide range of applications. In the present study 12gms of ferric chloride (FeCl3) was dissolved in 150ml of distilled water and solution was vigorously stirred for 20mins to attain 3pH. Precipitation was achieved by adding 100ml solution of 2M NaOH dropwise under vigorous stirring. The final pH of solution was maintained 12. The prepared nanoparticles were then centrifuged at 1500rpm for 20mins. The pellets were than oven dried at 70OC for 30mins. The dried iron oxide nanoparticles then grinded to attain a homogeneous size. Synthesised nanoparticles were characterised using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-rays Diffraction (XRD). There were three different dyes which are used for experiment i.e. Red, Yellow and Blue. To prepare a dye solutions, 100ml of tap water is mixed in 5% and 10% dyes to differ the concentration. Mix dye solution included 5% each dye in 100ml of tap water. Different pH dye solutions include pH 3, 5, 9 and 11. For acidic condition conc. HCl is used and for basic condition conc. NaOH is used. The results of characterization of synthesised nanoparticles shows the vibration at 3443.76 cm-1 and 1630.38 cm-1 in FTIR, SEM image showed the nanoparticles size range from 20nm to 80nm and XRD pattern analysis shows peaks at 2θ of 31.8596, 45.5656, 56.7600 and 75.3720. The crystalline average size was 53.83nm and of rhombohedral structure. After treatment of dyes with nanoparticles, experiment shows the significance decolourization and change in pH towards neutral phase.