Abstract The use of clay minerals as adsorbents in the removal of heavy metal ions is of great interest for many researchers. Most of the studies concern the impact of various factors, such as pH value, temperature, adsorption efficiency and surface modification of individual minerals, on the heavy metal accumulation. Various heavy metals can be captured from the solution by clay minerals or their composites. The latest one can be obtained by mineral modification by organic compounds or polyelectrolytes such as anionic polyacrylamide. The polymer presence on the solid surface may contribute to stronger accumulation of heavy metal ions and as a consequence to clear reduction of their availability for organisms. Moreover, it may stimulate the particle aggregation and increase the soil resistance for erosion significantly. For this purpose, the anionic polyacrylamide impact on the chromate ions adsorption on the kaolinite surface was studied. The effects of pH value, type of anionic polyacrylamide, heavy metal ion concentration and order of adsorbates addition to the clay mineral system were determined. Spectrophotometry, potentiometric titration and microelectrophoresis methods allowed to describe the adsorption, stability and electrokinetic properties of the examined systems. In such a way the immobilization possibilities of heavy metal ions in the polymeric surface layer were investigated.

中文翻译：

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高岭石/阴离子聚丙烯酰胺/铬酸盐离子体系中的吸附和电动研究

摘要 使用粘土矿物作为吸附剂去除重金属离子引起了许多研究人员的极大兴趣。大多数研究关注各种因素对重金属积累的影响，如pH值、温度、吸附效率和单个矿物的表面改性。粘土矿物或其复合物可以从溶液中捕获各种重金属。最新的一种可以通过有机化合物或阴离子聚丙烯酰胺等聚电解质进行矿物改性而获得。固体表面上的聚合物可能有助于重金属离子的更强积累，并因此明显降低它们对生物体的可用性。此外，它可能会刺激颗粒聚集并显着增加土壤的抗侵蚀能力。以此目的，研究了阴离子聚丙烯酰胺对高岭石表面铬酸盐离子吸附的影响。确定了pH值、阴离子聚丙烯酰胺类型、重金属离子浓度和吸附物添加到粘土矿物系统中的顺序的影响。分光光度法、电位滴定法和微电泳法可以描述所检测系统的吸附、稳定性和电动特性。以这种方式研究了聚合物表面层中重金属离子的固定可能性。电位滴定和微电泳方法可以描述所检测系统的吸附、稳定性和电动特性。以这种方式研究了聚合物表面层中重金属离子的固定可能性。电位滴定和微电泳方法可以描述被检测系统的吸附、稳定性和电动特性。以这种方式研究了聚合物表面层中重金属离子的固定可能性。