氨基酸对La(Ⅲ)与黄河沉积物相互作用的影响

Effect of Amino Acid on the Interaction between La(Ⅲ) and Sediments in Yellow River

研究了La3+离子在黄河水中与沉积物的相互作用特性及谷氨酸和酪氨酸对吸附作用的影响。结果表明,黄河水中La3+与沉积物相互作用的吸附等温线是一种台阶型的二级交换等温线,用分级离子交换等温式求出了平衡常数K1和K2。氨基酸对La3+与沉积物相互作用有明显影响,低浓度的氨基酸使La3+与沉积物的交换吸附作用增强;酪氨酸对镧与沉积物的相互作用的促进较谷氨酸大。

The isotherms of the interaction between La3+ and sediments, and the effects of glutamic and tyrosine acid on the isotherms in the Yellow River were studied The isotherm is a stepped and belongs to second order exchange isothermThe exchange equilibrium constants K1 and K2 were calculated by using the isothermal equation of surface stepwise ion exchangeThe effect of amino acid on the interaction between La3+ and sediments depends on the concentration and isoelectric point of amino acid It is proved that low concentration of amino acid can promote exchange adsorption The promotion of tyrosine is bigger than glutamic acid when the concentrations of two amino acids are the same.