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    Influence of dissolved black carbon on the aggregation and deposition of polystyrene nanoplastics: Comparison with dissolved humic acid

    Year: 2021

    Journal: Water Res., Volume 196, MAY 15

    Authors: Xu, Yanghui; Ou, Qin; He, Qiang; Wu, Zhengsong; Ma, Jun; Huangfu, Xiaoliu

    Organizations: National Natural Science Foundation of China [52070029, 51878092, 51608067]; basic scientific research operating expenses of central universities [2019CDCGHJ326]

    Keywords: Dissolved black carbon; Dissolved humic acid; Nanoplastics; Aging; Aggregation; Deposition

    Dissolved black carbon (DBC), widely found in soil and water environments is likely to affect the transport of nanoplastics in aquatic environments. The aggregation and deposition behaviors of fresh and aged polystyrene nanoplastics (PSs) with and without DBC in NaCl solution were investigated by time-resolved dynamic light scattering (DLS) and quartz crystal microbalance with dissipation monitoring equipment (QCM-D) techniques. The results suggest that DBC can screen the surface charges of PSs by interacting with PSs through hydrogen bonding, hydrophobic interactions and pi-pi interactions, although they were negatively charged. DBC promoted the aggregation of PSs under relatively low ionic strengths, and it minimally affected the stability of PSs under high ionic strength. Deposition experiments showed that both DBC in salt solution and DBC adsorption on silica surface facilitated the deposition of fresh PSs while HA inhibited both deposition processes. After aging, PSs were more stable, and the effects of DBC and HA were weakened. This study investigated the influence mechanism of DBC on the aggregation and deposition behaviors, which provides new insights into the stability and transport of PSs in complex aquatic environments. (C) 2021 Elsevier Ltd. All rights reserved.
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