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Polyamide microplastics as better environmental vectors of Cr(VI) in comparison to polyethylene and polypropylene microplastics

Marine Pollution Bulletin 2022 36 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 40 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Kailin Gong, Xuechun Shao, Xuechun Shao, Xuechun Shao, Xuechun Shao, Mengru Fu, Qi Zhang, Mengru Fu, Xuechun Shao, Xuechun Shao, Xuechun Shao, Xuechun Shao, Mengru Fu, Mengru Fu, Kailin Gong, Kailin Gong, Qi Zhang, Qi Zhang, Kailin Gong, Wei Zhang, Kailin Gong, Qi Zhang, Qi Zhang, Kailin Gong, Qi Zhang, Kailin Gong, Qi Zhang, Kailin Gong, Mengru Fu, Qi Zhang, Qi Zhang, Qi Zhang, Qi Zhang, Kailin Gong, Cheng Peng Wei Zhang, Wei Zhang, Cheng Peng Cheng Peng Qi Zhang, Qi Zhang, Qi Zhang, Mengru Fu, Mengru Fu, Mengru Fu, Mengru Fu, Weiyu Liang, Mengru Fu, Mengru Fu, Mengru Fu, Wei Zhang, Xuechun Shao, Xuechun Shao, Xuechun Shao, Xuechun Shao, Xuechun Shao, Wei Zhang, Mengru Fu, Weiyu Liang, Kailin Gong, Weiyu Liang, Xuechun Shao, Xuechun Shao, Mengru Fu, Weiyu Liang, Xuechun Shao, Kailin Gong, Weiyu Liang, Kailin Gong, Kailin Gong, Kailin Gong, Cheng Peng Kailin Gong, Cheng Peng Qi Zhang, Kailin Gong, Cheng Peng Wei Zhang, Mengru Fu, Mengru Fu, Qi Zhang, Mengru Fu, Mengru Fu, Qi Zhang, Wei Zhang, Xuechun Shao, Cheng Peng Wei Zhang, Qi Zhang, Qi Zhang, Cheng Peng Sadia Saif, Cheng Peng Cheng Peng Xuechun Shao, Qi Zhang, Cheng Peng Cheng Peng Cheng Peng Qi Zhang, Cheng Peng Qi Zhang, Wei Zhang, Wei Zhang, Wei Zhang, Wei Zhang, Wei Zhang, Cheng Peng Cheng Peng Cheng Peng

Summary

Researchers found that polyamide microplastics adsorb more hexavalent chromium (Cr(VI)) than polyethylene or polystyrene microplastics, with UV aging increasing adsorption capacity, making polyamide particles potentially more dangerous environmental vectors for this toxic heavy metal.

Polymers

PA PE PP

Study Type Environmental

The adsorption, desorption, and their influence factors of Cr(VI) by microplastics (MPs) in the solution was investigated in this study. The results demonstrated that UV aging promoted adsorption, while the increase of salinity and natural organic matter (NOM) inhibited adsorption. The particle size affected the total Cr(VI) active adsorption sites on MPs, while the pH changed the electrostatic force. The Cr(VI) adsorption by MPs conformed to the pseudo-first and pseudo-second order kinetic models, and was monolayer and inhomogeneous. SEM-EDS, XPS and ATR-FTIR analyses demonstrated that the physical adsorption dominated the adsorption process. Especially, the highest adsorption capacity of Cr(VI) by polyamide (PA) MPs was attributed to their hydrophilic amide groups. However, Cr(VI) was only released from PA MPs, of which desorption rate followed the sequence of seawater (79.5 %) > fresh water (66.6 %) > deionized water (34.8 %). Thus, PA MPs might be non-negligible environmental vectors for the transport of Cr(VI).

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