NDLI: Influence of clay minerals on sorption and bioreduction of arsenic under anoxic conditions

Content Provider	Springer Nature Link
Author	Ghorbanzadeh, Nasrin Lakzian, Amir Halajnia, Akram Kabra, Akhil N. Kurade, Mayur B. Lee, Dae S. Jeon, Byong Hun
Copyright Year	2015
Abstract	Adsorption of As(V) on various clay minerals including kaolinite (KGa-1), montmorillonite (SWy-1) and nontronites (NAU-1 and NAU-2), and subsequent bioreduction of sorbed As(V) to As(III) by bacterium Shewanella putrefaciens strain CN-32 were investigated. Nontronites showed relatively higher sorption capacity for As(V) primarily due to higher iron oxide content. Freundlich equation well described the sorption of As(V) on NAU-1, NAU-2 and SWy-1, while As(V) sorption isotherm with KGa-1 fitted well in the Langmuir model. The bacterium rapidly reduced 50 % of dissolved As(V) to As(III) in 2 h, followed by its complete reduction (>ca. 98 %) within 12 h. In contrast, sorption of As(V) to the mineral surfaces interferes with the activity of bacterium, resulting in low bioreduction of As(V) by 27 % for 5 days of incubation. S. putrefaciens also promoted the reduction of Fe(III) present in the clay mineral to Fe(II). This study indicates that the sorption and subsequent bioreduction of As(V) on clay minerals can significantly influence the mobility of As(V) in subsurface environment.
Starting Page	997
Ending Page	1005
Page Count	9
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	37
Issue Number	6
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Adsorption Arsenic Bioreduction Clay minerals Shewanella putrefaciens Environmental Health Geochemistry Terrestrial Pollution Soil Science & Conservation Environmental Chemistry Public Health
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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