Abstract::The characterization and mechanism of biosorption of lead onto H. verticallata were studied in this paper. The kinetic study showed that biosorption rate of lead(II) onto H. verticallata was fast as about 74.54% of total lead was removed within 10min and equilibrium was established within 20min. The overall sorption rate can be well fitted to the pseudo-second order model, with correlation of determination (R2) of 0.9910. Sips and Langmuir model were the better-fitting models for the biosorption of lead(II) onto H. verticallata than Freundlich model, which indicated that the biosorption of lead(II) onto H.verticallata follows monolayer coverage of lead(II) on the biomass surface and the interaction between lead molecules can be negligible. The FTIR spectra of biomass showed that there are lots of active groups on leaves of H. verticallata, and the possible functional groups responsible for lead(II) binding were carboxyl, hydroxyl, carbonyl groups, C–O and C–N. The concentration of mineral elements in leaves such as K, Na, Ca, Mg decreased after biosorption of lead, which indicated that lead(II) could be absorbed caused by ion exchanging with mineral elements.Furthermore,divalent elements such as Ca and Mg had better ion exchange capacity with lead ions.
李国新, 张丹丹, 颜昌宙, 薛培英. 轮叶黑藻对铅的吸附特征及生物吸附机理研究[J]. 中国环境科学, 2011, 31(8): 1327-1333.
LI Guo-Xin, ZHANG Dan-Dan, YAN Chang-Zhou, XUE Pei-Ying. Characterization and mechanism studies on biosorption of lead onto Hydrilla verticallata. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(8): 1327-1333.