2003•Unpublished venueRequires access
Adsorption Properties of Heavy Metals by Surface Layer Sediments in Wetlands
Wang Guo
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Abstract
The adsorption properties of heavy metals on sediments in Xianghai wetlands were studied through dynamic simulation technique under freezed- thawed. The influence of pH, temperature and the concentration of adsorbent as well as the adsorption isotherms of Cu, Zn, Mn, Pb were determined and evaluated. It was shown that pH value and the concentration of adsorbent were the main effect factors on the adsorption and the correlation between the adsorption percentage and the concentration of adsorbents was significant. However, the adsorption percentages of Cu and Zn had a sudden change at pH=6～ 8 with the pH increased under freezed- thawed. But the adsorption percentage of Pb was decreased when the pH value was over 9. The adsorption percentage increased with the concentration of adsorbent increased. The adsorption of these heavy metals on the sediments exhibited Langmuir and Freundlich adsorption equations.