Biogenic Mn oxides for effective adsorption of Cd from aquatic environment.
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.
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
You-Ting
YT
Meng
Yuan-Ming
YM
Zheng
Li-Mei
LM
Zhang
Ji-Zheng
JZ
He
D000327:Adsorption; D002104:Cadmium / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D055669:Ecological and Environmental Phenomena; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017895:Manganese Compounds / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D010087:Oxides / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D014961:X-Ray Diffraction
D017895:Manganese Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; D002104:Cadmium; C027424:manganese oxide