One-step and biogenic synthesis of magnetic Fe3O4-Fir sawdust composite: Application for selective preconcentration and determination of gold ions

摘要

Sawdust-Fe3O4 composite was prepared by one step and biogenic approach using a single iron precursor and sawdust as both reducing agents and template. The selectivity of composite toward Au(III) and its physicochemical properties, increased by modification with 3-aminopropyltriethoxysilane and synthetic ligand (3,5-dinitrobenzoylisothiocyanate); as the surface area and the adsorption capacity of sawdust, magnetic sawdust and modified composite were 4.24, 47.9 and 17.1 m(2) g(-1) and 3.2, 16.45 and 188.68 mg g(-1), respectively. Application of this selective sorbent for preconcentration of gold ions from environmental solutions was investigated. The isotherm models and thermodynamic parameters have also been studied. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.