Abstract:
Methylene blue, a synthetic dye is widely used in the textile industry. Methylene
blue has a negative impact on the environment, for example contaminated water, so it
is necessary to overcome this problem, using degradation method. This research has
been carried out on the application of iron oxide nanoparticles for the degradation of
methylene blue. Iron oxide nanoparticles are obtained from Logas natural sand
Kuantan Singingi Regency, Riau Province through a Ball Milling process.
Determination of the magnetic and morphological properties of the sample is
determined using a Vibrating Sample Magnetometer (VSM) and Scanning Electron
Microscope (SEM). The results of research using VSM showed that the values of
saturation magnetization (Ms), remanent magnetization (Mr) and coercivity (Hc)
increased with the addition of Cobalt concentration. The saturation Magnetization
value (Ms) is 7.98 emu/g; 17.42 emu/g; and 19.01 emu/g, Remanent magnetization
(Mr) 0.65 emu/g; 1.52 emu/g; and 1.64 emu/g, Coercivity (Hc) 124.21 Oe; 255.5 Oe;
and 269.29 Oe. The results of SEM data of iron oxide nanoparticles magnification of
10,000 times showed a decrease in the average particle size as the concentration of
Cobalt doping increased, namely 0.812 μm; 0.637μm; and 0.631 μm. The ability of
Iron Oxide nanoparticles as a catalyst in UV-Vis spectroscopy and showed a poor
ability to degrade methylene blue in aqueous solution when Iron Oxide nanoparticles
are doped with Cobalt. The best efficiency is when hematite is doped with Cobalt 0
wt.%, 5 wt.% and 10 wt.% in the first 20 minutes are 81.62%, 70.909% and 82.856%
respectively.
