Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 8-9, Pages 2577-2583Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.02.035
Keywords
Biogenic Mn oxides; Adsorption; Heavy metal; Cd; Aquatic environment
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Funding
- Ministry of Science and Technology of China [2005CB121104]
- Chinese Academy of Sciences [KZCX1-YW-06-03]
- Natural Science Foundation of China [50621804, 40671172]
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Biogenic Mn oxides exert important controls on trace metal cycling in aquatic and soil environments. A Mn-oxidizing bacterium Bacillus sp. WH4 was isolated from Fe-Mn nodules of an agrudalf in central China. The biogenic Mn oxides formed by mediation of this Mn oxidizing microorganism were identified as short-ranged and nano-sized Mn oxides. Cd adsorption isotherms, pH effect on adsorption and kinetics were investigated in comparison with an abiotic Mn oxide todorokite. Maximum adsorption of Cd to the biogenic Mn oxides and todorokite was 2.04 and 0.69 mmol g(-1) sorbent, respectively. Thus, the biogenic Mn oxides were more effective Cd adsorbents than the abiotic Mn oxide in the aquatic environment. The findings could improve our knowledge of biogenic Mn oxides formation in the environment and their important roles in the biogeochemical cycles of heavy metals. (c) 2009 Elsevier Ltd. All rights reserved.
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