Effect of Mn substitution on the oxidation/adsorption abilities of iron(III) oxyhydroxides
- Authors
- Cho, Dong-Wan; Chon, Chul-Min; Yang, Hyuncheol; Tsang, Yiu Fai; Song, Hocheol
- Issue Date
- Dec-2018
- Publisher
- SPRINGER
- Keywords
- Iron oxide; Manganese; Magnetic composite; Arsenic; Oxidation; Adsorption
- Citation
- CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY, v.20, no.SI 10, pp.2201 - 2208
- Indexed
- SCIE
SCOPUS
- Journal Title
- CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
- Volume
- 20
- Number
- SI 10
- Start Page
- 2201
- End Page
- 2208
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190913
- DOI
- 10.1007/s10098-018-1528-0
- ISSN
- 1618-954X
- Abstract
- In this study, divalent manganese ions [Mn(II)] were substituted a part of divalent iron ions [Fe(II)] present in Fe oxyhydroxides to prepare novel composites (Mn@Feox). The composites were prepared by (1) simultaneous hydrolysis of Fe(II) and Mn(II), and (2) rapid oxidation with H2O2. The resulting Mn@Feox prepared with different molar ratios of Fe and Mn was characterized and evaluated for their abilities to adsorb arsenic species [As(III) and As(V)] in aqueous solution. X-ray diffraction and field emission transmission electron microscope analyses revealed Mn@Feox has a -(Fe1-x, Mn-x)OOH-like structure with their mineralogical properties resembling those of feroxyhyte (-FeOOH). The increase in Mn substitution in Mn@Feox enhanced the oxidative ability to oxidize As(III) to As(V), but it decreased the adsorption capacity for both arsenic species. The optimal Mn/Fe molar ratio that could endow oxidation and magnetic capabilities to the composite without significantly compromising As adsorption capability was determined to be 0.1 (0.1Mn@Feox). The adsorption of As(III) on 0.1Mn@Feox was weakly influenced by pH change while As(V) adsorption showed high dependence on pH, achieving nearly complete removal at pH<5.7 but gradual decrease at pH>5.7. The adsorption kinetics and isotherms of As(III) and As(V) showed good conformity to pseudo-second-order kinetics model and Freundlich model, respectively.
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