Abstract
The current work is based upon an eco-friendly method to fabricate both pure and manganese doped iron oxide nanoparticles along with nanocomposites with polyvinyl alcohol using Indigofera Heterantha plant extract. Synthesis of iron oxide nanoparticles is confirmed successfully by UV-visible spectroscopy. The presence of coating materials, crystallinity and morphology was investigated via FTIR, XRD spectra and TEM. The prepared iron oxide, both pure and doped with Mn, along with their nanocomposites is employed for the uptake of chromium (VI) and lead (II) from its solutions successfully. Different parameters like concentration, contact time and pH of the media were analyzed for their possible effect on the efficiency of adsorbent. Maximum adsorption achieved at pH 3 and 5 for C-r (VI) and Pb (II) ions, respectively. Under preplanned conditions the maximum efficiency (Q(max)) of IONPs nanoparticles-based absorbent was 84% (Lead) and 92% (chromium) and equilibrium achieved within 20 min. Obtained data revealed that the adsorption of both C-r (VI) and Pb (II) ions on used adsorbent followed pseudo-second-order kinetics. Contrary to kinetics C-r ions adsorption is described by Freundlich isotherm while lead by Langmuir. The sorption model parameter demonstrates that the synthesized materials can be utilized as an excellent economical nano-adsorbent for the removal of Pb (II) and C-r (VI) from water.