Influence of dissolved black carbon on the aggregation and deposition of polystyrene nanoplastics: Comparison with dissolved humic acid.
Influence of dissolved black carbon on the aggregation and deposition of polystyrene nanoplastics: Comparison with dissolved humic acid.
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DOI：
10.1016/j.watres.2021.117054
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发表时间：
2021-03
期刊：
影响因子：
12.8
通讯作者：
Yanghui Xu;Qin Ou;Qiang He;Zhengsong Wu;Jun Ma;Xiaoliu Huangfu
中科院分区：
文献类型：
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作者：
Yanghui Xu;Qin Ou;Qiang He;Zhengsong Wu;Jun Ma;Xiaoliu Huangfu
广泛存在于土壤和水环境中的溶解黑碳（DBC）可能会影响纳米塑料在水生环境中的运输。采用时间分辨动态光散射（DLS）和石英晶体微天平-耗散监测装置（QCM-D）研究了氯化钠溶液中含和不含DBC的新鲜和老化聚苯乙烯纳米塑料（PS）的聚集和沉积行为。结果表明，虽然PS表面带负电荷，但DBC通过氢键、疏水相互作用和π-π相互作用屏蔽PS表面电荷. DBC在较低的离子强度下促进了PS的聚集，而在较高的离子强度下对PS的稳定性影响很小。沉积实验表明，无论是在盐溶液中的DBC和DBC吸附在二氧化硅表面促进新鲜PS的沉积，而HA抑制沉积过程。老化后PS更稳定，DBC和HA的作用减弱。本研究探讨了DBC对PS聚集和沉积行为的影响机制，为复杂水环境中PS的稳定性和迁移提供了新的见解。
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.