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- Title
Effective sorption of selenite by Fe–Mn binary oxide: influence of preparation method.
- Authors
Xiaohu Wen; Gaosheng Zhang
- Abstract
In this study, two Fe–Mn binary oxide sorbents with a same Mn:Fe molar ratio of 1:3 were prepared using two methods (coprecipitation and mechanical mixing), and they are denoted as c Fe–Mn and mFe–Mn, respectively. Both mFe–Mn and c Fe–Mn are amorphous and have similar structure with 2-line ferrihydrite. The c Fe–Mn has a much higher specific surface area than the mFe–Mn. Selenite sorption on both mFe–Mn and c Fe–Mn is pH dependent, decreasing with an increase in pH value. The estimated maximal sorption capacity of Se(IV) on the mFe–Mn and c Fe–Mn is 48.6 and 70.5 mg/g at pH 7.0, respectively. In addition, the Fe–Mn binary oxide is able to adsorb selenite in the presence of competing anions and across a wide range of pH values. Among the co-existing anions, phosphate is the greatest competitor for adsorptive sites on the surface of oxide. Selenite may be sorbed onto the surface of the Fe–Mn binary oxide by formation of inner-sphere surface complexes. The high sorption capacity, low cost and environmental friendliness of the Fe–Mn binary oxide make it a potentially attractive sorbent for the removal of Se(IV) from water.
- Subjects
OXIDES; ENVIRONMENTAL economics; SURFACE area; SORBENTS; SORPTION; FRIENDSHIP
- Publication
Desalination & Water Treatment, 2018, Vol 102, p173
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.21852