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Improving nanoplastic removal by coagulation: Impact mechanism of particle size and water chemical conditions

Journal of Hazardous Materials 2021 112 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.

Xinjie Wang, Xinjie Wang, Yunhai Zhang, Ying Li, Xinjie Wang, Xinjie Wang, Yunhai Zhang, Yunhai Zhang, Yang Li, Yunhai Zhang, Yunhai Zhang, Xinjie Wang, Yunhai Zhang, Yunhai Zhang, Xinjie Wang, Xinjie Wang, Xinjie Wang, Xinjie Wang, Yunhai Zhang, Yuexiao Shi, Yuexiao Shi, Yang Li Yunhai Zhang, Ying Li, Yuexiao Shi, Yang Li Yunhai Zhang, Yunhai Zhang, Yang Li Xinjie Wang, Xinjie Wang, Yang Li, Yongjun Zhang, Yongjun Zhang, Yongjun Zhang, Hao Wang, Yunhai Zhang, Yang Li Yongjun Zhang, Yongjun Zhang, Yuexiao Shi, Yunhai Zhang, Ying Li, Yang Li, Ying Li, Yang Li Yang Li Ying Li, Ying Li, Yang Li, Yongjun Zhang, Yongjun Zhang, Yongjun Zhang, Yongjun Zhang, Yongjun Zhang, Yongjun Zhang, Yang Li

Summary

Researchers found that coagulation using aluminum chlorohydrate and polyacrylamide achieved up to 98.5% removal efficiency for polystyrene nanoplastics, with smaller particles being easier to remove, though humic acid in water competed for adsorption sites and reduced effectiveness.

Polymers

Plastic particles may bring potential threats to the ecosystem. Coagulation, as a widely used method to remove particles, has been rarely studied for plastic particles in the nanometer range. In this work, the coagulation removal of polystyrene nanoplastic particles (PSNPs, 50-1000 nm) was conducted in a model system containing coagulants aluminum chlorohydrate (PAC) and polyacrylamide (PAM). The optimal removal efficiency (98.5%) was observed in the coagulation process at pH= 8.0, 0.4 g·L PAC and 20 mg·L PAM. The inhibition impact of humic acid was also noticed, due to its competitive adsorption with PSNPs onto flocs. The interaction energies between PSNPs and PAC were calculated by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, which showed that electrical neutralization resulted in the difference of the remove efficiency in different sizes and coagulant concentrations. The formation of Al-O bond between PSNPs and PAC/PAM flocs promoted the removal of PSNPs. Excessive PAM (> 20 mg·L) increased clusters size and solution viscosity, which resulted in the settling of clusters being controlled by buoyancy and the reduced remove efficiency. The findings suggest that the chemical coagulation dominants the removal of NPs, and the coagulation efficiency can be optimized by choosing suitable coagulant and water chemical conditions.

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