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Adsorption-desorption Kinetic Characteristics of Hg2+ in Surface Sediments and Natural Biofilm from the Watershed (Vol.42, No.3) TEXT SIZE: A A A

LI Qing-Zhao, LUO Xu

Institute of Resources and Environment, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China 

Abstract: Natural biofilm represents a kind of stable ecological system by a variety of microbial cells , playing an immeasurable role in the migration of Hg in the watershed.The present study is based on sediments and biofilm from the Weihe River at the Henan section to study the characteristics of static adsorption thermodynamics in the course of Hg adsorption into those materials.The results indicated that the adsorption of Hg by sediment and biofilm belongs to a non-linear one and the adsorption progress fits well to the Freundlich and Langmuir isotherms at a significance level of P=0.005(n =7). The adsorption dynamic processes of Hg2+on the biofilm or biofilm mixed sediments could be fitted by the Lagergren kinetic model (R20.98). The pH is an important factor affecting the adsorption of Hg on sediment and biofilm, and the peak adsorption pH is within the range of 57. The maximum adsorption rate and capacity of Hg for three materials follow the order of biofilm > biofilm mixed sediments > sediment. While the desorption rates of the three materials by NaNO3  follow the order of sediment > biofilm mixed sediments > biofilm.

Key words: Hg; natural biofilm; surface sediment; non-linear adsorption

EARTH AND ENVIRONMENT Vol. 42, No.3, Tot No.299, 2014, Page 306-310
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