This study aimed to identify the effects of a low cost polycation, i.e., polyDADMAC (PD), on the aggregation of newly formed Fe oxides. An evaluation was performed over a wide range of pH values and PD concentrations using combined zeta potential and aggregation measurements. PD adsorbs on the surface of the newly formed Fe oxides, altering their surface charge to less negative values, favouring colloidal aggregation. In the absence of PD, aggregation of the newly formed Fe oxides was favoured in a narrow pH range (i.e., 5–6), whereas the presence of PD resulted in faster aggregation over the entire pH range of 3 to 11. In general, PD showed more obvious efficacy at alkaline pH values, and its performance decreased at pH < 6. The presence of soluble Si or Al altered the effect of PD, suggesting the necessity to consider the effects of Si and Al when using PD to remove Fe oxides.

这项研究旨在确定低成本聚阳离子（即polyDADMAC（PD））对新形成的Fe氧化物聚集的影响。使用zeta电势和聚集测量值对广泛的pH值和PD浓度进行了评估。PD吸附在新形成的Fe氧化物的表面上，将其表面电荷改变为较小的负值，有利于胶体聚集。在没有PD的情况下，新形成的Fe氧化物在较窄的pH范围（即5–6）中倾向于聚集，而PD的存在导致在3至11的整个pH范围内聚集更快。 PD在碱性pH值下显示出更明显的功效，而在pH <6时其性能下降。可溶性Si或Al的存在改变了PD的作用，