共 82 条
Natural Organic Matter Stabilizes Pristine Nanoplastics but Destabilizes Photochemical Weathered Nanoplastics in Monovalent Electrolyte Solutions
被引:0
作者:
Xu, Yanghui
[1
,2
]
Wang, Xintu
[1
]
van der Hoek, Jan Peter
[2
,3
]
Liu, Gang
[1
,2
,4
]
Lompe, Kim Maren
[2
]
机构:
[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
[2] Delft Univ Technol, Fac Civil Engn & Geosci, Dept Water Management, Sect Sanit Engn, NL-2628 CN Delft, Netherlands
[3] Waternet, Dept Res & Innovat, NL-1090 GJ Amsterdam, Netherlands
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金:
中国国家自然科学基金;
关键词:
nanoplastics;
aggregation tendency;
naturalorganic matter;
photochemical weathering;
stericrepulsion;
polymer bridging;
HUMIC-ACID;
POLYSTYRENE NANOPLASTICS;
ENGINEERED NANOPARTICLES;
COLLOIDAL STABILITY;
TIO2;
NANOPARTICLES;
FUNCTIONAL-GROUPS;
AGGREGATION;
SUBSTANCES;
MICROPLASTICS;
ADSORPTION;
D O I:
10.1021/acs.est.4c11540
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Photochemical weathering and eco-corona formation through natural organic matter (NOM) adsorption play vital roles in the aggregation tendencies of nanoplastics (NPs) in aquatic environments. However, it remains unclear how photochemical weathering alters the adsorption patterns of NOM and the conformation of the eco-corona, subsequently affecting the aggregation tendencies of NPs. This study examined the effect of Suwannee River NOM adsorption on the aggregation kinetics of pristine and photoaged polystyrene (PS) NPs in monovalent electrolyte solutions. The results showed that photochemical weathering influenced the conformation of the eco-corona, which, in turn, determined NP stability in the presence of NOM. Hydrophobic components of NOM predominantly bound to pristine NPs through hydrophobic and pi-pi interactions, and extended hydrophilic segments in water hindered NP aggregation via steric repulsion. Conversely, hydrogen bonding facilitated the binding of these hydrophilic segments to multiple photoaged NPs, thereby destabilizing them through polymer bridging. Additionally, the stabilization and destabilization capacities of NOM increased with its concentration and molecular weight. These findings shed light on the destabilizing role of NOM in weathered NPs, offering new perspectives on environmental colloidal chemistry and the fate of NPs in complex aquatic environments.
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页码:1822 / 1834
页数:13
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