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Nanocolloids in the soil environment: Transformation, transport and ecological effects.
Environ Res
December 2024
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Carbon Neutrality Interdisciplinary Science Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China. Electronic address:
Nanocolloids (Ncs) are ubiquitous in natural systems and play a critical role in the biogeochemical cycling of trace metals and the mobility of organic pollutants. However, the environmental behavior and ecological effects of Ncs in the soil remain largely unknown. The accumulation of Ncs may have detrimental or beneficial effects on different compartments of the soil environment.
View Article and Find Full Text PDFAre nano-colloids controlling rare earth elements mobility or is it the opposite? Insight from A4F-UV-QQQ-ICP-MS.
Chemosphere
September 2024
Univ. Rennes, CNRS, Géosciences Rennes, UMR 6118, F-35000, Rennes, France.
Article Synopsis
- Research shows that the mobility of rare earth elements (REEs) in the environment is influenced by colloids, particularly iron-organic colloids (Fe-OM), which come in both large and small sizes.
- A study using advanced techniques found that Fe-OM nano-colloids, around 25 nm in diameter, can aggregate more at lower pH levels and significantly change size when interacting with REEs, especially heavy REEs that form strong complexes.
- The addition of calcium enhances the aggregation of these nano-colloids by neutralizing their charges, suggesting that REEs can influence their own movement and the transfer of colloids in the environment.
Generic method for the detection of short & long chain PFAS extended to the lowest concentration levels of SERS capability.
Chemosphere
September 2024
Foundation for Research and Technology-Hellas, Institute of Chemical Engineering Sciences, (FORTH/ICE-HT), Stadiou Str. Platani, 265 04, Patras, Greece. Electronic address:
The detection of the highly toxic per- and polyfluoroalkyl substances, PFAS, constitutes a challenging task in terms of developing a generic method that could be rapid and applicable simultaneously to both long and short-chain PFAS at ppt concentration level. In the present study, the method introduced by the USA Environmental Protection Agency, EPA, to detect surfactants, using methylene blue, MB, which is identified an ideal candidate for PFAS-MB ion pairing, is extended at the lowest concentration range by a simple additional step that involves the dissociation of the ion pairs in water. In this work, Surface Enhanced Raman Scattering, SERS, is applied via Ag nanocolloidal suspensions to probe MB and indirectly either/or both short-chain (perfluorobutyric acid, PFBA) and long-chain (perfluoloctanoic acid, PFOA) PFAS downt to 5 ppt.
View Article and Find Full Text PDFTrace Small Molecular/Nano-Colloidal Multiscale Electrolyte Additives Enable Ultra-Long Lifespan of Zinc Metal Anodes.
Adv Mater
September 2024
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
Electrolyte additives are efficient to improve the performance of aqueous zinc-ion batteries (AZIBs), yet the current electrolyte additives are limited to fully water-soluble additives (FWAs) and water-insoluble additives (WIAs). Herein, trace slightly water-soluble additives (SWAs) of zinc acetylacetonate (ZAA) were introduced to aqueous ZnSO electrolytes. The SWA system of ZAA is composed of a FWA part and a WIA part in a dynamic manner of dissolution equilibrium.
View Article and Find Full Text PDFEnhanced Arsenate Immobilization by Kaolinite via Heterogeneous Pathways during Ferrous Iron Oxidation.
Environ Sci Technol
July 2024
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Clay minerals are ubiquitous in subsurface environments and have long been recognized as having a limited or negligible impact on the fate of arsenic (As) due to their negatively charged surfaces. Here, we demonstrate the significant role of kaolinite (Kln), a pervasive clay mineral, in enhancing As(V) immobilization during ferrous iron (Fe(II)) oxidation at near-neutral pH. Our results showed that Fe(II) oxidation alone was not capable of immobilizing As(V) at relatively low Fe/As molar ratios (≤2) due to the generation of Fe(III)-As(V) nanocolloids that could still migrate easily as truly dissolved As did.
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