Abstract:

Adsorptive separation of Pb(II) from aqueous solution containing Pb(II) and other heavy metals (Cu(II), Zn(II), and Cd(II)) has been investigated, using three adsorbents, such as an iminodiacetic acid-chelating resin (CR11), and Fe-based adsorbents (goethite and magnetite). Batchwise adsorption of Pb(II) and other metal ions in single metal system and multi-components system was carried out with varying parameters, such as pH, time, and initial concentrations of metals. CR11 possesses the highest adsorption ability for these metals, while the selectivity of individual metal is little. Goethite possesses selectivity for Pb(II) and Cu(II), and magnetite possesses selectivity for Pb(II), though the adsorption capacity for the metals are less than those with CR11. The kinetics of the adsorption of the metals with all adsorbents are of pseudo-second order, and the magnetite is revealed to have the fastest adsorption kinetics. The three adsorbents can be applied for chromatographic separation for these metals. The magnetite is feasible for selective separation of Pb(II), although complete elution cannot be achieved.

摘要：

研究了使用三种吸附剂（例如亚氨基二乙酸）从含有Pb（II）和其他重金属（Cu（II），Zn（II）和Cd（II））的水溶液中吸附分离Pb（II）的方法。螯合树脂（CR11）和铁基吸附剂（针铁矿和磁铁矿）。在单金属系统和多组分​​系统中，Pb（II）和其他金属离子的分批吸附采用各种参数进行，例如pH，时间和金属初始浓度。CR11对这些金属具有最高的吸附能力，而单个金属的选择性很小。针铁矿具有对Pb（II）和Cu（II）的选择性，磁铁矿具有对Pb（II）的选择性，尽管对金属的吸附能力小于CR11。所有吸附剂对金属的吸附动力学均为准二级，而磁铁矿的吸附动力学最快。三种吸附剂可用于这些金属的色谱分离。该磁铁矿对于选择性分离Pb（II）是可行的，尽管无法实现完全洗脱。