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Impact of bioreduction on remobilization of adsorbed cadmium on iron minerals in anoxic condition

Title
Impact of bioreduction on remobilization of adsorbed cadmium on iron minerals in anoxic condition
Author
전병훈
Keywords
adsorption; bioreduction; clay minerals; Shewanella putrefaciens; remobilization
Issue Date
2017-06
Publisher
WATER ENVIRONMENT FEDERATION
Citation
WATER ENVIRONMENT RESEARCH, v. 89, no. 6, page. 519-526
Abstract
The impact of bioreduction on the remobilization of adsorbed cadmium Cd(II) on minerals, including hematite, goethite, and two iron(III)-rich clay minerals nontronites (NAU-1 and NAU-2) under anoxic conditions was investigated. Langmuir isotherm equation better described the sorption of Cd(II) onto the all minerals. The maximum adsorption capacity was 6.2, 18.1, 3.6, and 4 mg g(-1) for hematite, goethite, NAU-1 and NAU-2, respectively. The desorption of Cd(II) was due to the production of Fe(II) as a result of bioreduction of structural Fe(III) in the minerals by Shewanella putrefaciens. The bioreduction of Cd(II)-loaded Fe(III) minerals was negligible during the initial 5 days followed by a rapid increase up to 20 days. The amount of Cd(II) in solution phase at the end of 30 days increased up to 0.07 mmol L-1 for hematite, NAU-1, and NAU-2 and 0.02 mmol L(-)1 for goethite. The X-ray diffraction study showed negligible changes in bioreduced minerals phases.
URI
https://onlinelibrary.wiley.com/doi/abs/10.2175/106143017X14902968254449http://repository.hanyang.ac.kr/handle/20.500.11754/114665
ISSN
1061-4303; 1554-7531
DOI
10.2175/106143017X14902968254449
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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