Abstract

Sri Hilma Siregar¹, Karna Wijaya², Eko Sri Kunarti² and Akhmad Syoufian²

DOI : http://dx.doi.org/10.13005/ojc/340213

This research aims to determine characteristics of the magnetic properties of Fe₃O₄- (CTAB-Mt) composites and the effect of variation in Fe³⁺/Fe²⁺ concentrations on the characteristics of Fe₃O₄- (CTAB-Montmorillonite) composites. Fe₃O₄- (CTAB-Montmorillonite) composites were synthesized using an “in situ” co-precipitation method. The synthesis was carried out by mixing FeCl₃·6H₂O and FeSO₄·7H₂O (in different concentrations) with a mole ratio of Fe³⁺ to Fe²⁺ by 2:1, which was then mixed into the CTAB-montmorillonite suspension. This mixture was stirred using a magnetic stirrer at 3500 rpm for 30 minutes at a temperature of 85°C, then the ammonia solution 25% was added. reaction lasted for 24 hours. The resulting composites were characterized using XRD, BET, and VSM to measure the magnetic properties of the materials. Results of the XRD data analysis showed that the values of d(311) is equal to 2.5686 Å and d(220) is equal to  2.947 Å, which are the characteristics of the materials known as magnetite. Based on the VSM data obtained, the magnetic saturation (Ms) values for samples of different concentrations were as follows: SH01=14.0 emu/gram, SH02= 29.0 emu/gram, SH03= 28.9 emu/gram, SH04= 45.2 emu/gram, and SH05= 64.1 emu/gram.

Montmorillonite; Fe3O4-(CTAB-Mt); Magnetite

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