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Removal efficiency and adsorption mechanisms of CeO2 nanoparticles onto granular activated carbon used in drinking water treatment plants

The Science of The Total Environment 2022 53 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Serge Stoll Lina Ramirez Arenas, Lina Ramirez Arenas, Lina Ramirez Arenas, Lina Ramirez Arenas, Philippe Le Coustumer, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Serge Stoll Serge Stoll Serge Stoll Serge Stoll Serge Stoll Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Philippe Le Coustumer, Stéphane Zimmermann, Stéphan Ramseier Gentile, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphane Zimmermann, Philippe Le Coustumer, Stéphan Ramseier Gentile, Serge Stoll Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphan Ramseier Gentile, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Philippe Le Coustumer, Serge Stoll Stéphan Ramseier Gentile, Serge Stoll Stéphane Zimmermann, Serge Stoll Stéphane Zimmermann, Stéphane Zimmermann, Philippe Le Coustumer, Stéphan Ramseier Gentile, Serge Stoll Philippe Le Coustumer, Stéphane Zimmermann, Serge Stoll Serge Stoll Serge Stoll Stéphane Zimmermann, Stéphane Zimmermann, Stéphane Zimmermann, Serge Stoll Stéphane Zimmermann, Serge Stoll Serge Stoll Serge Stoll Stéphane Zimmermann, Philippe Le Coustumer, Serge Stoll Philippe Le Coustumer, Serge Stoll Serge Stoll Philippe Le Coustumer, Lina Ramirez Arenas, Serge Stoll Philippe Le Coustumer, Serge Stoll Serge Stoll

Summary

Researchers investigated how well granular activated carbon (GAC), commonly used in drinking water treatment, can remove cerium oxide nanoparticles. The study found that GAC achieved removal efficiencies of up to 75% in natural lake water, with adsorption driven primarily by electrostatic attraction and enhanced by the presence of divalent cations and natural organic matter.

Study Type Environmental

The presence of NPs in drinking water resources raises a global concern on their potential risk for human health, and whether or not drinking water treatment plants are able to effectively remove NPs to prevent their ingestion by humans. In this study, we investigate the efficiency of granular activated carbon (GAC), commonly used in conventional municipal water treatment processes, for the removal of CeO<sub>2</sub> NPs. In ultrapure water, NPs are found to have a good affinity for GAC and results indicate an increase in the adsorption capacity from 0.62 ± 0.10 to 5.05 ± 0.51 mg/g, and removal efficiency from 35 % ± 4 to 54 % ± 5 with increasing NPs concentration. Kinetic studies reveal that intraparticle diffusion is not the only rate controlling step indicating that mass transfer effect is also playing a role. Adsorption mechanisms are mainly controlled by the electrostatic attractions between the positively charged NPs and negatively charged GAC. Although electrostatic conditions in Lake Geneva water are less favorable for NPs adsorption, the adsorption capacity and removal efficiency are higher than in ultrapure water with values raising from 0.41 ± 0.17 to 7.13 ± 1.13 mg/g and 26 % ± 8 to 75 % ± 11, respectively. Furthermore, the external mass transfer process onto GAC surface is more important than for ultrapure water. NPs adsorption mechanism is explained by the presence of divalent cations and natural organic matter (NOM) which promote the formation of CeO<sub>2</sub> NPs-NOM-divalent cation heteroaggregates increasing both adsorption and removal efficiency by cation bridging.

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