Synthesis and Characteristics of the Magnetic Properties of Fe3o4 – (Ctab-Montmorillonite) Composites Based on Variation in Fe3+/Fe2+Concentrations

Abstract

This research aims to determine characteristics of the magnetic properties of Fe 3 O 4 -(CTAB-Montmorillonite) composites and the effect of variation in Fe 3+ /Fe 2+ concentrations on the characteristics of Fe 3 O 4 -(CTAB-Montmorillonite) composites. Fe 3 O 4 -(CTAB-Montmorillonite) composites were synthesized using an in situ co-precipitation method. The synthesis was carried out by mixing FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O (in different concentrations) with a mole ratio of Fe 3+ to Fe 2+ 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 min. 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/g, SH02= 29.0 emu/g, SH03= 28.9 emu/g, SH04= 45.2 emu/g, and SH05= 64.1 emu/g.

Magnetic iron oxide/clay nanocomposites for adsorption and catalytic oxidation in water treatment applications

“…Szabo concluded that the lamellar sizes and cation exchange capacities of clay minerals affect MNP growth and magnetization. Comparing the formation of MNPs in laponite with their formation in montmorillonite showed that the size effect and greater amount of aggregation in laponite composites were related to the dominance of the maghemite phase due to the greater contribution of attractive dipolar interactions between magnetic nanocrystals [87]. Compared to laponite, montmorillonite sheets accommodated the formation of nanoparticles, while in the laponite, formed particles had the tendency to produce highly exfoliated clay lamellae.…”

“…Magnetic fields exert much influence on the adsorption of dyes, as shown by their increase of removal and adsorption capacity. In addition, increasing nanoparticle size increases saturation magnetization [87]. Nanoparticle size analysis can be carried out using transmission electron microscopy ( Table 3).…”