Relation of lead adsorption on birnessites with di erent average oxidationstates of manganese and release of Mn2+/H+/K+
ZHAO Wei , FENG Xionghan , TAN Wenfeng , LIU Fan , DING Shuwen
DOI:
Received May 13, 2008,Revised August 15, 2008, Accepted , Available online
Volume 21,2009,Pages 520-526
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The characteristics of Pb2+ adsorption on the surface of birnessites with di erent average oxidation states (AOS) of Mn, synthesized
under acidic and alkali conditions, were investigated. The results indicated that the amount of adsorbed Pb2+ increased with the increase
of Mn AOS in birnessites. The amount of Pb2+ adsorbed positively correlated with the amount of released Mn2+, H+, and K+ (r =
0.9962 > 0.6614, n = 14, = 0.01). The released Mn2+, H+, and K+ were derived mostly from the corresponding cations adsorbed on
the vacant sites. The maximum amount of adsorbed Pb2+ increased with the increasing vacant cation sites, leading to an increase of the
total amount of released Mn2+, H+, and K+, and the increased likelihood for two Pb2+ adsorbed in the region of one side of a vacant
site.
