KINETIKA ADSORPSI Cr(VI) MENGGUNAKAN ADSORBEN MAGNETIT (Fe3O4) DAN MAGNETIT TERLAPIS ASAM HUMAT (Fe3O4/AH)
Abstrak: The adsorption
kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe3O4) and magnetite
coated humic acids (Fe 3 O 4 /HA) have been studied. Adsorbent of Fe3O4and Fe3O4
/HA were synthesized by co-precipitation method and then characterized by
FT-IR, XRD and TEM image measurements. The acidity of the solution was adjusted
to pH 3, comparasion on the adsorption kinetics of Cr(VI) on Fe3O4 between Fe3O4/HA.
The FT-IR spectra revealed the presence of main fuctional groups of Fe-O and
C-O at free carboxylate acid in Fe 3 O 4 /HA and those of only Fe-O in Fe 3 O 4
. The two adsorbent had similar diffraction peaks at 2θ. The TEM image
demonstaretd that Fe 3 O 4 were spherical in shape and uniform distribution and
then Fe 3 O 4 /HA had no uniform size. Adsorption of Cr(VI) by Fe 3 O 4 was
much faster than Fe 3 O 4 /HA at the acidity of pH 3, with adsorption rate
constant (k) of 0.013 g.mg -1 .menit -1 for Fe 3 O 4 and 0.0062 g.mg -1 .menit
-1 for Fe 3 O 4 /HA. The two adsorbents were giving a model of adsorption
kinetics Ho (pseudo order 2).
Penulis: Soerja Koesnarpadi,
Daniel Tarigan
Kode Jurnal: jpkimiadd140672
