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Adsorption mechanism of cadmium on microplastics and their desorption behavior in sediment and gut environments: The roles of water pH, lead ions, natural organic matter and phenanthrene

Water Research 2020 353 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.

Gang He, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yanfei Zhou, Yuyi Yang Yuyi Yang Yanfei Zhou, Yuyi Yang Yanfei Zhou, Yuyi Yang Yanfei Zhou, Guihua Liu, Gang He, Wenzhi Liu, Gang He, Wenzhi Liu, Yanfei Zhou, Wenzhi Liu, Gang He, Gang He, Yuyi Yang Yanfei Zhou, Guihua Liu, Yuyi Yang Wenzhi Liu, Wenzhi Liu, Wenzhi Liu, Yuyi Yang Wenzhi Liu, Yuyi Yang Gang He, Yuyi Yang Wenzhi Liu, Yuyi Yang Wenzhi Liu, Wenzhi Liu, Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yanfei Zhou, Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang Wenzhi Liu, Wenzhi Liu, Yuyi Yang Yuyi Yang Yuyi Yang Wenzhi Liu, Yuyi Yang Wenzhi Liu, Yuyi Yang Yuyi Yang Wenzhi Liu, Yuyi Yang Wenzhi Liu, Yuyi Yang Yuyi Yang Yuyi Yang Yuyi Yang

Summary

Researchers compared how cadmium adsorbs onto five different microplastic types and then desorbs in simulated sediment and gut environments, finding that pH, competing ions, natural organic matter, and co-pollutants like phenanthrene all significantly alter how much cadmium is released.

Polymers

ABS PA PE PET PS PVC

Models

Invertebrate other

Study Type Environmental

Microplastics (MPs) in aquatic systems can act as a vector for various toxic contaminants, such as metal ions. Although some studies have investigated the adsorption characteristics of metal ions on MPs, the desorption behaviors of metal ions from MPs in different environments are largely unknown. Here, the adsorption of cadmium (Cd(II)) onto five different types of MPs were compared to examine the relationship between the surface characteristics and the adsorption properties of MPs. Our results showed that polyamide had the highest Cd(II) adsorption capability with a value of 1.70 ± 0.04 mg/g, followed by polyvinyl chloride (1.04 ± 0.03 mg/g), polystyrene (0.76 ± 0.02 mg/g), acrylonitrile butadiene styrene (0.65 ± 0.02 mg/g) and polyethylene terephthalate (0.25 ± 0.01 mg/g). The specific surface area and total pore volume were closely correlated with the adsorption capacity of the MPs, and the π-π interaction, electrostatic interaction and oxygen-containing functional groups played crucial roles in the adsorption of Cd(II) onto the MPs. The sorption capabilities of Cd(II) onto the MPs first increased and then decreased with increasing solution pH from 2.0 to 9.0. In addition, the adsorption capacities were suppressed with the presence of lead ions (20-80 mg/L), while the coexistence of phenanthrene had a minor impact. Interestingly, the presence of humic acid promoted the desorption of Cd(II) from the MPs both in the synthetic earthworm gut and in the sediment system. A higher desorption rate was observed in the simulated gut environment, suggesting that metal-contaminated MPs would pose higher ecological risks to macroinvertebrates. Overall, our findings provide a better understanding of the sorption mechanism of Cd(II) onto MPs and the desorption behavior under different environmental conditions in aquatic ecosystems.

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