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Heteroaggregation kinetics of nanoplastics and soot nanoparticles in aquatic environments

Journal of Hazardous Materials 2024 14 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Ziqing Huang, Dehua Zeng, Dehua Zeng, Ziqing Huang, Sijia Liu, Yanjun Liu, Dehua Zeng, Dehua Zeng, Chen Yang, Weilin Huang Weilin Huang Chengyu Chen, Chengyu Chen, Chengyu Chen, Ziqing Huang, Ziqing Huang, Ziqing Huang, Ziqing Huang, Ziqing Huang, Ziqing Huang, Chen Yang, Chengyu Chen, Weilin Huang Dehua Zeng, Ziqing Huang, Chen Yang, Chen Yang, Zhiyu Zhang, Ziqing Huang, Ziqing Huang, Chen Yang, Weilin Huang Dehua Zeng, Ziqing Huang, Yanjun Liu, Sijia Liu, Chengyu Chen, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Weilin Huang Chen Yang, Dehua Zeng, Ziqing Huang, Ziqing Huang, Zhiyu Zhang, Sijia Liu, Dehua Zeng, Ziqing Huang, Ziqing Huang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Yanjun Liu, Chen Yang, Chengyu Chen, Chen Yang, Zhi Dang, Zhiyu Zhang, Zhi Dang, Weilin Huang Weilin Huang Zhi Dang, Zhi Dang, Zhi Dang, Weilin Huang Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Weilin Huang Zhi Dang, Zhi Dang, Weilin Huang Zhi Dang, Weilin Huang Weilin Huang Chen Yang, Weilin Huang Weilin Huang Weilin Huang Chen Yang, Chengyu Chen, Chengyu Chen, Weilin Huang Chengyu Chen, Weilin Huang Chengyu Chen, Chen Yang, Zhi Dang, Weilin Huang Weilin Huang Zhi Dang, Chengyu Chen, Weilin Huang Chengyu Chen, Zhi Dang, Chengyu Chen, Chengyu Chen, Chengyu Chen, Weilin Huang Chen Yang, Zhi Dang, Chengyu Chen, Chengyu Chen, Zhi Dang, Chen Yang, Weilin Huang

Summary

Researchers examined how polystyrene nanoplastics and soot particles aggregate together in aquatic environments, finding that particle ratio, salinity, pH, and dissolved organic matter all influence clumping rates — with calcium ions dramatically accelerating aggregation and potentially altering nanoplastic transport in coastal and marine waters.

Heteroaggregation between polystyrene nanoplastics (PSNPs) and soot nanoparticles (STNPs) in aquatic environments may affect their fate and transport. This study investigated the effects of particle concentration ratio, electrolytes, pH, and humic acid on their heteroaggregation kinetics. The critical coagulation concentration (CCC) ranked CCC > CCC > CCC, indicating that heteroaggregation rates fell between homoaggregation rates. In NaCl solution, as the PSNPs/STNPs ratio decreased from 9/1 to 3/7, heteroaggregation rate decreased and CCC increased from 200 to 220 mM due to enhanced electrostatic repulsion. Outlier was observed at PSNPs/STNPs= 1/9, where CCC= 170 mM and homoaggregation of STNPs dominated. However, in CaCl solution where calcium bridged with STNPs, heteroaggregation rate increased and CCC decreased from 26 to 5 mM as the PSNPs/STNPs ratio decreasing from 9/1 to 1/9. In composite water samples, heteroaggregation occurred only at estuarine and marine salinities. Acidic condition promoted heteroaggregation via charge screening. Humic acid retarded or promoted heteroaggregation in NaCl or CaCl solutions by steric hindrance or calcium bridging, respectively. Other than van der Waals attraction and electrostatic repulsion, heteroaggregation was affected by steric hindrance, hydrophobic interactions, π - π interactions, and calcium bridging. The results highlight the role of black carbon on colloidal stability of PSNPs in aquatic environments.

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