Abstract
This research has been done in order to prepare a magnetic adsorbent that will be used to absorb thorium in waste water. The magnetic adsorben was prepared by mixing active carbon with salt solution of Fe(III)/Fe(II) (rasio molar 2 : 1) and adding NaOH solution. Solids part in the solution was separated and heated at 100 °C in oven for 2 hours. The solids part was then characterized by X-Ray Diffractometer (XRD), Vibrating Sample Magnetic (VSM) dan Brunauer Emmett Teller (BET). The characterization results showed that iron oxide Fe 3 O 4 phase having superparamagnetic behaviour have been formed in composite and attached permanently on active carbon surface. When these composite was slurry in water, it can be recollected easily by using simple permanent magnet. The adsorption test for thorium by variation of pH indicates that higher pH solution is higher adsorption efficiency. At pH >7, the solubility of thorium was low so that it can be adsorbed maximally. Analysis result of isothermal and Langmuir adsorption indicated that the present of Fe 3 O 4 particles on an active carbon structure mostly did not decrease the thorium adsorption capacity. Active carbon-Fe 3 O 4 composite can be used as an alternative adsorbent for treatment of thorium contained waste water. Keywords: Adsorben, Active Carbon-Fe 3 O 4 , Thorium.
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