SYNTHESIS AND CHARACTERIZATION OF COMPOSITE MAGNETITE-BENTONITE FROM INDONESIAN LOCAL MINERALS
Moersilah, Arif Rahman, Edit Alanas, and Rosmalia

Department of Chemistry, Faculty of Mathematics and Science, State University of Jakarta, Jl. Rawamangun Muka, Jakarta Timur, Jakarta, Indonesia

Abstract

The use of modified natural materials as adsorbents has been widely reported. In this study, synthesize and characterization of magnetite-bentonite composite composites from Indonesian local minerals was reported. Composites are synthesized by inserting iron ion into the bentonite layers with a mole ratio of 1: 1 Fe2+ / Fe3+ ions; 1: 1.5; and 1: 2, hereinafter referred to as composite A, composite B, and composite C respectively. All composites were then calcined at a temperature of 400 oC for 1 hour. Iron oxide formed in the area between bentonite layers has a magnetite structure and have high thermal stability. This can be seen from the diffraction pattern obtained from XRD analysis. The specific surface area of the composite also increased compared to pure bentonite. Before being modified, pure bentonite had a surface area of 47,824 m2/g and after insertion of iron oxide there was an increase. Composite A is 87.482 m2/g composite B is 83.774 m2/g and composite C is 98.336 m2/g.

Keywords: composite, magnetit, Bentonit from Indonesian

Topic: Material Science