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Ramirez Arenas L, Le Coustumer P, Ramseier Gentile S, Zimmermann S, Stoll S. Removal efficiency and adsorption mechanisms of CeO 2 nanoparticles onto granular activated carbon used in drinking water treatment plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 856:159261. [PMID: 36208736 DOI: 10.1016/j.scitotenv.2022.159261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 09/29/2022] [Accepted: 10/02/2022] [Indexed: 06/16/2023]
Abstract
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 CeO2 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 CeO2 NPs-NOM-divalent cation heteroaggregates increasing both adsorption and removal efficiency by cation bridging.
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Affiliation(s)
- Lina Ramirez Arenas
- Group of Environmental Physical Chemistry, Department F.-A. Forel for environmental and aquatic sciences, University of Geneva, Uni Carl Vogt, 66, boulevard Carl-Vogt, CH-1211 Geneva 4, Switzerland.
| | - Philippe Le Coustumer
- EA CNRS 4592 Géoressources & Environnement, Université Bordeaux Montaigne, 1 allée F. Daguin, F-3607 Pessac, France; CNRS-INRA-Université de Bordeaux UMS 3420, Bordeaux Imaging Center, 146 rue Léo Saignat, CS 61292, F-33076 Bordeaux, France
| | | | - Stéphane Zimmermann
- SIG, Industrial Boards of Geneva, Ch. du Château-Bloch, Le Lignon, 1211 Genève 2, Switzerland
| | - Serge Stoll
- Group of Environmental Physical Chemistry, Department F.-A. Forel for environmental and aquatic sciences, University of Geneva, Uni Carl Vogt, 66, boulevard Carl-Vogt, CH-1211 Geneva 4, Switzerland.
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Ramirez Arenas L, Ramseier Gentile S, Zimmermann S, Stoll S. Nanoplastics adsorption and removal efficiency by granular activated carbon used in drinking water treatment process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 791:148175. [PMID: 34118680 DOI: 10.1016/j.scitotenv.2021.148175] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/26/2021] [Accepted: 05/26/2021] [Indexed: 05/26/2023]
Abstract
In this study Granular Activated Carbon (GAC) used in drinking water treatment processes is evaluated for its capacity to adsorb and remove polystyrene (PS) nanoplastics. Batch experiments are conducted in ultrapure and surface water from Lake Geneva, currently used as drinking water resources. Equilibrium and kinetic studies are conducted to understand adsorption mechanisms and limiting factors. Our results show that in ultrapure water the adsorption and removal of PS nanoplastics are mainly due to electrostatic interactions between the positively charged nanoplastics and negatively charged GAC. It is found that the adsorption capacity increases with nanoplastic concentration with a maximum adsorption capacity of 2.20 mg/g. The adsorption kinetics follows a pseudo-second-order model and indicates that the intra-particle diffusion is not the only rate-controlling step. The Langmuir isotherm indicates that nanoplastics are adsorbed as a homogeneous monolayer onto the GAC surface with a maximum monolayer adsorption capacity of 2.15 mg/g in agreement with the experimental value. In Lake Geneva water the adsorption capacity and removal efficiency of PS nanoplastics are found three times higher than in ultrapure water and increase significantly with increasing PS nanoplastics concentration with a maximum adsorption capacity of 6.33 mg/g. This improvement in adsorption capacity is due to the presence of Dissolved Organic Matter (DOM), resulting in PS surface charge modification, presence of divalent ions making possible the adsorption of PS-DOM complexes, and, aggregation of PS nanoplastics. The kinetic pseudo-second-order and intra-particle diffusion provide a good correlation with the experimental data. In contrast, neither Langmuir nor Freundlich isotherms describe in a satisfactory way the adsorption of nanoplastics by GAC. This study reveals that GAC produced from renewable sources can be considered as a moderate adsorbent for the removal of PS nanoplastics in water treatment plants and that the presence of DOM and cationic species play a major role.
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Affiliation(s)
- Lina Ramirez Arenas
- Group of Environmental Physical Chemistry, Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Uni Carl Vogt, 66, boulevard Carl-Vogt, CH-1211 Geneva 4, Switzerland.
| | | | - Stéphane Zimmermann
- SIG, Industrial Boards of Geneva, Ch. du Château-Bloch, Le Lignon, 1211 Genève 2, Switzerland
| | - Serge Stoll
- Group of Environmental Physical Chemistry, Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Uni Carl Vogt, 66, boulevard Carl-Vogt, CH-1211 Geneva 4, Switzerland.
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Li P, Zou X, Wang X, Su M, Chen C, Sun X, Zhang H. A preliminary study of the interactions between microplastics and citrate-coated silver nanoparticles in aquatic environments. JOURNAL OF HAZARDOUS MATERIALS 2020; 385:121601. [PMID: 31727533 DOI: 10.1016/j.jhazmat.2019.121601] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 10/25/2019] [Accepted: 11/02/2019] [Indexed: 05/22/2023]
Abstract
Microplastics and silver nanoparticles (AgNPs) are considered two emerging environmental contaminants that have adverse effects on aquatic environments. Knowledge on the interactions between AgNPs and microplastics may improve our understanding of these pollutants, posing to surrounding environments and public health. However, current knowledge regarding this issue is limited. Here, we investigate, for the first time, the interactions between AgNPs and the microplastics polyethylene (PE), polypropylene (PP), and polystyrene (PS) in aquatic environments. Results showed no significant interactions between AgNPs and PE or PP microplastics. However, AgNPs were efficiently removed by PS microplastics. These differences are mainly attributed to the presence of π-π interactions. Meanwhile, AgNPs aggregations were generated due to higher concentrations of leaching additives derived from PS microplastics. Interestingly, AgNPs are significantly captured on PS microplastic surfaces in the form of Ag0 rather than Ag+. The capture process is a monolayer adsorption and influenced greatly by the mass ratio of AgNPs and PS microplastics. These observations may provide a novel environmental fate of AgNPs, and indicate a new potential method for their removal to some degree. These findings demonstrate the complexities of AgNPs absorption onto microplastics and enhance present understanding of interactions between nanoparticles and microplastics in aquatic environments.
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Affiliation(s)
- Penghui Li
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoyan Zou
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Xiaodan Wang
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Min Su
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Chen Chen
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Xia Sun
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Hongwu Zhang
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
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Yang DL, Sun Q, Duan YH, Niu H, Wang RL, Wang D, Zhu MF, Wang JX. Efficient Construction of SiO2 Colloidal Nanoparticle Clusters as Novel Fillers by a Spray-Drying Process for Dental Composites. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02720] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
| | | | | | | | - Rui-Li Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, P. R. China
| | | | - Mei-Fang Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, P. R. China
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