Ma Wei, Tobin J M
Department of Chemistry, Dalian University of Technology, 116023, China.
Water Res. 2003 Sep;37(16):3967-77. doi: 10.1016/S0043-1354(03)00290-2.
Biosorption of Cr(3+), Cu(2+) and Cd(2+) from binary metal solutions onto peat in the batch systems was investigated at pH 4. The order of maximum uptake was Cr>or=Cu>Cd and maximum uptake levels of ca. 0.4 mmol/g were observed for chromium and copper while cadmium was taken up to a maximum of ca. 0.2 mmol/g. Co-ion competition resulted in up to 70 percent decrease of primary metal uptake. A novel approach to multicomponent sorption modelling involving regression to the total metal taken up was adopted. Two extended Langmuir-type models were found to exhibit good fit to the experimental data. Using the simpler model of these, three-dimensional sorption surfaces were generated which describe the metal uptake as a function of equilibrium concentrations of both metals. These methods allow prediction of metal uptakes over a continuum of concentrations of both metals in binary systems.
在批次系统中，研究了pH值为4时二元金属溶液中Cr(3+)、Cu(2+)和Cd(2+)在泥炭上的生物吸附。最大吸附量顺序为Cr≥Cu＞Cd，铬和铜的最大吸附量约为0.4 mmol/g，而镉的最大吸附量约为0.2 mmol/g。共存离子竞争导致主要金属的吸附量降低了70%。采用了一种涉及回归到总吸附金属量的多组分吸附建模新方法。发现两个扩展的朗缪尔型模型与实验数据拟合良好。使用其中较简单的模型，生成了三维吸附表面，该表面将金属吸附量描述为两种金属平衡浓度的函数。这些方法能够预测二元体系中两种金属在连续浓度范围内的吸附量。
