Reduction Reaction of Fe3+ Ion by Activated Carbon

SHIRAKASHI Takashi

doi:10.1246/nikkashi.1993.924

Activataed carbon is widely used as the adsorbent and the catalyst of oxidation. However, there are little studies about the reduction reaction by activated carbon. In this paper, the effect of the solution conditions and the pretreatment of activated carbon on the reduction of Fes+ was investigated. The experiments were carried out as follows: Activated carbon was added to the HC1 solution containing Fes+ and the time course of Fe2+ concentration was measured by o-phenanthroline method. When the reaction was carried out in an atmosphere of nitrogen, activated carbon was added to the HC1 solution and degassed with an aspirator and then Fes+ solution was added after passing the N, gas. In the presence of dissolved oxygen, the time course of Fe2+ co ncentration displayed a maximum curvature, but it displayed increasing curvature in an atmosphere of nitrogen (Fig.2). Consequently, activated carbon can reduce Fes+ to Fe2+ in the presence or absence of dissolved oxygen and oxidize Fe- to Fes+ if oxygen is dissolved. Reducing ability of the activated carbon decreased by th e acid treatment in the presence of oxygen (Table 2, Fig.3) and by the Fes+ treament (Fig.6). However, reducing ability was restored by drying the treated carbon (Figs.4, 5, 6) and the degree of restoration of reducing ability increased with an increase in the drying temperature (Fig.4). Initial reduction rate was not affected by the presence of dissolved oxygen (Fig.7), Fe+ (Fig.8)and acid concentration (Fig.9). These results suggest that at the begining of the reaction, only reduction reaction proceed even if oxygen is dissolved.

Reduction Reaction of Fe3+ Ion by Activated Carbon

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