Department of Chemical Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370, Wroclaw, Poland.
Environ Sci Pollut Res Int. 2017 Jul;24(21):17912-17919. doi: 10.1007/s11356-017-9435-1. Epub 2017 Jun 15.
Colloidal particles have an ability to sorb heavy metals, metalloids, and organic compounds (e.g. biosurfactants) present in soil and groundwater. The pH and ionic strength changes may promote release of such particles causing potential contaminant transport. Therefore, it is very important to know how a colloid particle-mineral particle and colloid-mineral-biosurfactant system behaves in the natural environment. They can have negative impact on the environment and human health. This study highlighted the influence of biosurfactants produced by Pseudomonas aeruginosa on the transport of colloidal hematite (α-FeO) through porous bed (materials collected from the Szklary and Zloty Stok solid waste heaps from Lower Silesia, Poland). Experiments were conducted using column set in two variants: colloid solution with porous bed and porous bed with adsorbed biosurfactants, in the ionic strengths of 5 × 10 and 5 × 10 M KCl. The zeta potential of mineral materials and colloidal hematite, before and after adsorption of biosurfactant, was determined. Obtained results showed that reduction in ionic strength facilitates colloidal hematite transport through the porous bed. The mobility of colloidal hematite was higher when the rhamnolipid adsorbed on the surface of mineral grain.
胶体颗粒具有吸附土壤和地下水中存在的重金属、类金属和有机化合物（如生物表面活性剂）的能力。pH 值和离子强度的变化可能会促进这些颗粒的释放，从而导致潜在污染物的迁移。因此，了解胶体-矿物颗粒和胶体-矿物-生物表面活性剂系统在自然环境中的行为非常重要。它们可能会对环境和人类健康产生负面影响。本研究强调了铜绿假单胞菌产生的生物表面活性剂对胶体赤铁矿（α-FeO）通过多孔床（从波兰下西里西亚的 Szklary 和 Zloty Stok 固体废物堆收集的材料）迁移的影响。实验使用两种变体的柱组进行：胶体溶液与多孔床和吸附生物表面活性剂的多孔床，在 5×10 和 5×10 M KCl 的离子强度下进行。测定了矿物材料和胶体赤铁矿在吸附生物表面活性剂前后的 ζ 电位。获得的结果表明，离子强度的降低有利于胶体赤铁矿通过多孔床的迁移。当鼠李糖脂吸附在矿物颗粒表面时，胶体赤铁矿的迁移率更高。
