期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 122, 期 -, 页码 12-16出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2013.10.033
关键词
Layered double hydroxide; Fe2+; Doping; Cr(VI); Removal
资金
- Ministry of Education, Science, Sports, and Culture [23651061]
- Grants-in-Aid for Scientific Research [23651061] Funding Source: KAKEN
Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ was prepared by dropwise addition of a mixed solution of MgCl2, FeCl2, and AlCl3 to NaOH solution at a constant pH. The Fe2+-doped LDH was found to be able to remove Cr(VI) from an aqueous solution through the anion exchange of Cr2O72- with the intercalated Cl-, the production of Cr(OH)(3), and the adsorption of Cr2O72- on the surface of the produced FeO(OH). The excellent performance of this LDH for Cr(VI) removal is caused by both the anion exchange properties of Mg-Al LDH and the reducing activity of the Fe2+ doped into the Mg-Al LDH. This process can be considered to occur through Langmuir-type adsorption, and the maximum adsorption amount and equilibrium adsorption constant are 12.5 mmol g(-1) and 242.1, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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