TY - JOUR
T1 - Influence of dissolved black carbon on the aggregation and deposition of polystyrene nanoplastics
T2 - Comparison with dissolved humic acid
AU - Xu, Yanghui
AU - Ou, Qin
AU - He, Qiang
AU - Wu, Zhengsong
AU - Ma, Jun
AU - Huangfu, Xiaoliu
PY - 2021
Y1 - 2021
N2 - 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 π-π 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.
AB - 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 π-π 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.
KW - Aggregation
KW - Aging
KW - Deposition
KW - Dissolved black carbon
KW - Dissolved humic acid
KW - Nanoplastics
UR - http://www.scopus.com/inward/record.url?scp=85102850888&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2021.117054
DO - 10.1016/j.watres.2021.117054
M3 - Article
C2 - 33770677
AN - SCOPUS:85102850888
SN - 0043-1354
VL - 196
JO - Water Research
JF - Water Research
M1 - 117054
ER -