STUDI PENGARUH UKURAN PARTIKEL DAN SIFAT MAGNETIK NANOPARTIKEL MAGNESIUM FERRITE (MgFe2O4) SERTA PENGGUNAAN SISTEM HIGH GRADIENT MAGNETIC SEPARATION (HGMS) PADA ADSORPSI Cu(II), Fe(II), Ni(II); STUDY ON EFFECTS OF PARTICLES SIZE AND MAGNETIC PROPERTIES OF MAGNESIUM FERRITE(MgFe2O4) NANOPARTICLES AND THE USE OF HIGH GRADIENT MAGNETIC SEPARATION (HGMS) SYSTEM FOR Cu (II), Fe(II), Ni(II) ADSORPTION

Setiawati, Dewi, Edi Suharyadi

2015 | Disertasi | FMIPA

Magnesium ferrite magnetic nanoparticles have been used for Cu(II), Fe(II) and Ni(II) adsorption. Research have been carried out to determine the effects of particles size(2.12 nm, 8.35 nm, 10.8 nm), saturation magnetization Ms (2.7 emu/gr, 4.95 emu/gr, 6.15 emu/gr), coating MgFe2O4 by silica, the use of high gradient magnetic separation (HGMS) with applied various of magnetic field (65.5 G, 327 G, 653 G), and also comparative of the adsorption between adsorbent MgFe2O4, CoFe2O4, and Fe3O4. Total metals adsorbed was analyzed by using Atomic Absorption Spectrometer (AAS). The adsorption of Fe(II) maximum 100% at all of various parameter. Cu(II) and Ni(II) removal was found maximum by using adsorbent with particles size 8.35 nm and the percentage are 99.18±0.01% and 99.79±0.03% for Cu(II) and Ni(II), respectively. The adsorption of Ni(II) ions higher than Cu(II) at the various magnetic properties. This may be due to magnetic properties of adsorbent and adsorbate contribute in sediment separation process when using an external magnetic field. Maximum value of Cu(II) removal using adsorbent with Ms4.95 emu/gram is 99.25±0.01%. Meanwhile, for Ni(II) using adsorbent Ms 6.15 emu/gram is 99.79±0.03%. Addition of adsorbent with silica resulted in the increase of Cu(II) metals ions removal from 97.84±0.02% to 99.95±0.002% but for Ni(II) decreased from 99.74±0.01% to 96.29±0.03%. The adsorbat removal performance were compared at various kind of adsorbent, the percentage of adsorption followed the order: Fe3O4>CoFe2O4>MgFe2O4 for Cu(II) and Fe3O4>CoFe2O4>MgFe2O4 for Ni(II). There were no significant change in the adsorption of Ni(II) and Fe(II) as increasing magnetic field applied in HGMS system. While, increasing magnetic field led to a decrease of Cu(II) adsorption due to the oxidation of copper matrixs.

Kata Kunci : MgFe2O4; adsorption; Cu(II); Fe(II); Ni(II); high gradient magnetic separation.