Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie- Sklodowska University in Lublin, M. Curie-Sklodowska Sq. 3, 20-031, Lublin, Poland.
Institute of Agrophysics, Polish Academy of Sciences, Doswiadczalna 4, 20-290, Lublin, Poland.
Chemosphere. 2021 Aug;276:130088. doi: 10.1016/j.chemosphere.2021.130088. Epub 2021 Feb 24.
Heavy metals, such as Pb(II), Cd(II), Hg(II), do not degrade like organic compounds and remain in soil for a long time. The presence of organic, mineral or polymeric substances (such as polyacrylamides) may contribute to the accumulation and immobilization of toxic metals in poorly absorbable form for living organisms. The main aim of the study was to compare the effectiveness of lead(II) ions immobilization on the layered aluminosilicate surfaces in the anionic polyacrylamide presence. The effectiveness of Pb(II) adsorption was tested depending on metal cation concentration, content of dissociable groups in added flocculant as well as internal structure of clay mineral. The desorption tests of heavy metal ions were performed by the use of water and EDTA (ethylenediaminetetraacetic acid). By means of measurements of suspension stability and aggregate size formed in the studied systems, the flocculating ability of anionic polyacrylamide was checked. The electrokinetic parameters of mineral particles, i.e. surface charge density and electrokinetic potential, without and with individual adsorbates were also determined. It has been shown that the Pb cations adsorbed amount and the effectiveness of their immobilization strongly depends on the polyacrylamide presence in the system and the internal structure of aluminosilicate.
重金属，如 Pb(II)、Cd(II)、Hg(II)，不像有机化合物那样降解，会在土壤中长时间存在。有机、矿物或聚合物质（如聚丙烯酰胺）的存在可能有助于将有毒金属以生物体难以吸收的形式积累和固定。本研究的主要目的是比较在阴离子聚丙烯酰胺存在下，层状铝硅酸盐表面固定 Pb(II)离子的效果。根据金属阳离子浓度、添加的絮凝剂中可解离基团的含量以及粘土矿物的内部结构，测试了 Pb(II)吸附的效果。通过使用水和 EDTA（乙二胺四乙酸）进行重金属离子的解吸测试。通过测量研究体系中悬浮液稳定性和形成的聚集体大小，检查了阴离子聚丙烯酰胺的絮凝能力。还测定了没有和有单个吸附物时矿物颗粒的电动参数，即表面电荷密度和电动电位。结果表明，Pb 阳离子的吸附量及其固定的效果强烈依赖于体系中聚丙烯酰胺的存在以及铝硅酸盐的内部结构。
