Authors: Young-Hoon Jo, Young Wook Chung, Si-Hyun Do
Fe2O3–based composite was prepared by the mixing of a MnSO4 solution with α-Fe2O3 (hematite) suspended solution followed by the addition of NaOH. BET surface area of hematite and the composite were 5.14 and 54.6 m2 g-1, and pore diameters from the BJH plot were 21.3 and 50.4 nm, respectively. SEM-EDS result showed that Fe and Mn were detected on the surface of composite, which indicated that Mn was covered parts of hematite surface. Based on XRD patterns, manganese oxides (i.e. possibly Mn2O3 or Mn3O4) on the surface were identified. The synthesized composite was represented as Mn-Fe2O3 composite. As an aspect of Fenton-like oxidation, degradation of carbon tetrachloride (CT) was
conducted at the pH of 7 when H2O2 was reacted with Mn-Fe2O3. As expected, H2O2 alone did not degrade
CT and the synthesized composite alone did not adsorb CT. Even though H2O2/Fe2O3 system could degrade CT in some degrees, H2O2/Mn-Fe2O3 system showed the higher and faster CT degradation than H2O2/Fe2O3 system. Those results indicated that Mn as oxide forms was immobilized on hematite using a simple method, and CT degradation was enhanced by the reaction of H2O2 and Mn-Fe2O3.
Keywords: Fenton-like oxidation, Mn immobilization, Mn-Fe2O3 composite, CT degradation