PENGARUH PENAMBAHAN KARBON AKTIF PADA STRUKTUR KRISTAL DAN MAGNETISASI PARTIKEL NANO Fe3O4[Addition Effect of Active Carbon on Crystal Structure and Magnetization of Fe3O4 Nanoparticles]

Abstract

The addition effect of Carbon active (C) on crystal structure and magnetization of Fe3O4 nanoparticles as adsorbent have been studied. The samples of Fe3O4 nanoparticles have been synthesized by coprecipitation method. It were prepared Fe3O4 samples without and with the addition of C. The sample without C addition is called FeM, and the weight ratio of Fe3O4 precursors to C were varied. The Fe3O4 weight ratio to C is 1:1, 1:2 and 1:3, hereinafter called FeC11, FeC12 and FeC13, respectively. The samples were characterized by XRD(x-ray diffraction), VSM (vibrating sample magnetometer) and TEM (transmission electron microscope). The analysis results of x-ray diffraction data using the Rietveld method showed that the lattice parameters of Fe3O4 on FEM, FeC11, FeC12 and FeC13 are as follows: a = b = c = 8.390 (3) Å, a = b = c = 8.433 (4) Å, a= b = c = 8.43 (1) Å, and a = b = c = 8.434 (5) Å, respectively. Each magnetization curves of the FEM,FeC11, FeC12 and FeC13 show the super paramagnetic properties. The magnetization of FEM, FeC11, FeC12 and FeC13 are Ms = 60, 30, 20 and 15 emu/g, respectively. The more C added, the longer the Fe3O4 lattice parameter is. This means that some C entered into the crystal system of Fe3O4 as interstitial atoms. With growing number of C atoms in the interstitial positions between Fe and Fe, magnetization of Fe3O4 decreases. FeC12 sample has the smallest size of crystallites or the large surface area. So it may have the greatest adsorption capacity.