Low Cost Biosorbents Based On Modified Starch Iron Oxide Nanocomposites For Selective Removal Of Some Heavy Metals From Aqueous Solutions

Petroleum Application Department, Egyptian Petroleum Research Institute, 1 Ahmed El-Zomor street, Nasr city, Cairo, 11727, Egypt

Adv. Mater. Lett., 2016, 7 (5), pp 402-409

DOI: 10.5185/amlett.2016.6061

Publication Date (Web): Apr 04, 2016

Copyright © IAAM-VBRI Press

E-mail: drmanar770@yahoo.com

Abstract

In this work, the starch extracted from potato peels was modified with acrylic acid. Nanoparticles composed of modified starch polymer and Fe₃O₄ (modified potato starch-magnetic nanoparticles, MPS-MNPs) were synthesized. The prepared nanoadsorbents were used for selective exclusion of Pb²⁺, Cu²⁺, and Ni²⁺ ions from water. They were characterized by different analytical instruments such as FTIR, TEM and XRD. Adsorption of all captured metal ions onto MPS-MNPs was observed to be reliant on temperature, pH and contact time. Clump adsorption balance was come to in 60 min and most extreme uptakes for Cu²⁺, Pb²⁺ and Ni²⁺ in non-aggressive adsorption mode were 100, 70 and 100 mgg⁻¹, respectively at 35 â—¦C. In focused adsorption tests, PS-MNPs specially adsorbed Ni²⁺ions with an affinity order of Ni²⁺>Cu²⁺>Pb²⁺. The effect of monomer and initiator concentrations on grafting process was studied. Furthermore, the recyclability of PS-MNPs was investigated. 

Keywords

Heavy metals, potato starch, low cost, adsorbents, magnetic nanoparticles.