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Influence of macromolecules and electrolytes on heteroaggregation kinetics of polystyrene nanoplastics and goethite nanoparticles in aquatic environments

Journal of Hazardous Materials 2024 7 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Ziqing Huang, Jingyi Gu, Dehua Zeng, Tingting Cai, Tingting Cai, Dehua Zeng, Ziqing Huang, Dehua Zeng, Dehua Zeng, Jingyi Gu, Weilin Huang Weilin Huang Ziqing Huang, Ziqing Huang, Ziqing Huang, Ziqing Huang, Ziqing Huang, Chengyu Chen, Jingyi Gu, Ziqing Huang, Chengyu Chen, Jingyi Gu, Chengyu Chen, Ziqing Huang, Tingting Cai, Weilin Huang Chengyu Chen, Weilin Huang Dehua Zeng, Ziqing Huang, Dehua Zeng, Zhiyu Zhang, Ziqing Huang, Ziqing Huang, Jingyi Gu, Jingyi Gu, Jingyi Gu, Chengyu Chen, Jingyi Gu, Zhi Dang, Zhi Dang, Jingyi Gu, Weilin Huang Zhi Dang, Zhi Dang, Zhi Dang, Jiamin Peng, Dehua Zeng, Ziqing Huang, Ziqing Huang, Zhiyu Zhang, Jiamin Peng, Dehua Zeng, Ziqing Huang, Ziqing Huang, Jiamin Peng, Zhi Dang, Chengyu Chen, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Tingting Cai, Jiamin Peng, Tingting Cai, Tingting Cai, Jiamin Peng, Zhi Dang, Zhi Dang, Jiamin Peng, Zhiyu Zhang, Zhi Dang, Jiamin Peng, Zhi Dang, Jiamin Peng, Jiamin Peng, Weilin Huang Jiamin Peng, Zhi Dang, Weilin Huang Zhi Dang, Weilin Huang Weilin Huang Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Zhi Dang, Weilin Huang Chengyu Chen, Zhi Dang, Weilin Huang Weilin Huang Weilin Huang Weilin Huang Weilin Huang Weilin Huang Chengyu Chen, Chengyu Chen, Yang Chen, Weilin Huang Weilin Huang Weilin Huang Weilin Huang Chengyu Chen, Chengyu Chen, Zhi Dang, Zhi Dang, Chengyu Chen, Weilin Huang Chengyu Chen, Chengyu Chen, Chengyu Chen, Zhi Dang, Chengyu Chen, Zhi Dang, Chengyu Chen, Zhi Dang, Weilin Huang

Summary

Researchers studied how proteins, DNA, and humic acid affect the clumping of polystyrene nanoplastics with iron mineral particles in water, finding that at low concentrations all three macromolecules inhibit aggregation through steric hindrance — with proteins most effective — but that calcium ions can override this stabilization by bridging humic acid to particle surfaces.

Fate and transport of nanoplastics in aquatic environments are affected by their heteroaggregation with minerals in the presence of macromolecules. This study investigated the heteroaggregation of polystyrene nanoplastics (PSNPs) with goethite nanoparticles (GNPs) under the influence of macromolecules [humic acid (HA), bovine serum albumin (BSA), and DNA] and electrolytes. Under 1 mg C/L macromolecule, raising electrolyte concentration promoted heteroaggregation via charge screening, except that calcium bridging with HA also enhanced heteroaggregation at CaCl concentration above 5 mM. At all NaCl concentrations and CaCl concentration below 5 mM, 1 mg C/L macromolecules strongly retarded heteroaggregation, ranking BSA > DNA > HA. Raising macromolecule concentration strengthened such stabilization effect of all macromolecules in NaCl solution and that of DNA and BSA in CaCl solution by enhancing steric hindrance. However, 0.1 mg C/L BSA slightly promoted heteroaggregation in CaCl solution due to stronger electrostatic attraction than steric hindrance. In CaCl solution, raising HA concentration strengthened its destabilization effect via calcium bridging. Macromolecules having more compact globular structure and higher molecular weight may exert greater steric hindrance to inhibit heteroaggregation more effectively. This study provides new insights on the effects of macromolecules and electrolytes on heteroaggregation between nanoplastics and iron minerals in aquatic environments.

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