Biogenic Synthesis of Iron Oxide Nanoparticle Using Padina Pavonica Extract: Application for Photocatalytic Degradation of Congo Red Dye, Neurotoxicity and Antioxidant Activity

The current study focused on green synthesis of iron nanoparticles by Padina pavonica (Pa@FeNPs), removal activity of dye CR (Congo Red) and investigating antioxidant and neurotoxicity activities. The morphological and physical properties of Pa@FeNPs were characterized by FT-IR ( Fourier Transform Infrared Spectroscopy), XRD (X-Ray Diffractometer), SEM (Scanning Electron Microscopy), EDX (X-Ray Spectroscopy), TEM (Transmission Electron Microscopy) and Zeta potential analyses. XRD and zeta potential analyses revealed a potential of-8.53 mV and formation of cubic crystals with an average dimension of 10.53-20.55 nm. The optimum conditions of pH, temperature, initial dye concentration and adsorbent amount for CR removal were found to be 4, 40 degrees C, 20 ppm and 20 mg respectively. The CR removal percentage using Pa@FeNPs reached a very high efficiency of 95%. Langmuir Isotherm model (R-2=0.99, 25 degrees C) was best fitted to our data for evaluating dye adsorption behaviors of the Pa@FeNPs. Metal chelating activity in the aqueous extract of P. pavonica and Pa@FeNPs was found to be 74.71 +/- 2.16% and 64.95 +/- 0.42%, respectively. Inhibitory concentration 50 (IC50) values for P. pavonica aqueous extract and Pa@FeNPs were found to be 0.128 mu g/mL and 400 mu g/mL, respectively in the SH-SY5Y ( Human neuroblastoma).