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Sorption and Redox Speciation of Plutonium at the Illite Surface

03-Feb-2016 | Nidhu lal Banik; Rémi Marsac; Johannes Lützenkirchen; Alexandre Diascorn; Kerstin Bender; Christian Michael Marquard ..., Environmental Science & Technology, 2016

The geochemical behavior of Pu strongly depends on its redox speciation. In this study, we investigated Pu sorption onto Na–illite, a relevant component of potential host rocks for high-level nuclear waste repositories, under anaerobic conditions. When contacting Pu (85% Pu(IV), 11% Pu(V), and 4% ...

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Homogeneous and Heterogeneous (Fex, Cr1–x)(OH)3 Precipitation: Implications for Cr Sequestration

28-Jan-2016 | Chong Dai; Xiaobing Zuo; Bo Cao; Yandi Hu, Environmental Science & Technology, 2016

The formation of (Fe, Cr)(OH)3 nanoparticles determines the fate of aqueous Cr in many aquatic environments. Using small-angle X-ray scattering, precipitation rates of (Fe, Cr)(OH)3 nanoparticles in solution and on quartz were quantified from 0.1 mM Fe(III) solutions containing 0–0.25 mM Cr(III) ...

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Zn Isotope Fractionation during Sorption onto Kaolinite

28-Jan-2016 | Damien Guinoiseau; Alexandre Gélabert; Julien Moureau; Pascale Louvat; Marc F. Benedetti, Environmental Science & Technology, 2016

In this study, we quantify zinc isotope fractionation during its sorption onto kaolinite, by performing experiments under various pH, ionic strength, and total Zn concentrations. A systematic enrichment in heavy Zn isotopes on the surface of kaolinite was measured, with Δ66Znadsorbed-solution ...

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Effects of Rhamnolipid and Carboxymethylcellulose Coatings on Reactivity of Palladium-Doped Nanoscale Zerovalent Iron Particles

27-Jan-2016 | Sourjya Bhattacharjee; Mohan Basnet; Nathalie Tufenkji; Subhasis Ghoshal, Environmental Science & Technology, 2016

Nanoscale zerovalent iron (NZVI) particles are often coated with polymeric surface modifiers for improved colloidal stability and transport during remediation of contaminated aquifers. Doping the NZVI surface with palladium (Pd-NZVI) increases its reactivity to pollutants such as ...

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Kinetics of CO2 Absorption into Aqueous Basic Amino Acid Salt: Potassium Salt of Lysine Solution

25-Jan-2016 | Shufeng Shen; Ya-nan Yang; Yangyang Bian; Yue Zhao, Environmental Science & Technology, 2016

Aqueous amino acid salts are considered as an attractive alternative to alkanolamine solvents (e.g., MEA) for carbon dioxide (CO2) absorption. The kinetics of CO2 into unloaded aqueous solutions of potassium lysinate (LysK) was studied using a wetted wall column at concentrations ranging from ...

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Production of Molecular Iodine and Tri-iodide in the Frozen Solution of Iodide: Implication for Polar Atmosphere

22-Jan-2016 | Kitae Kim; Akihiro Yabushita; Masanori Okumura; Alfonso Saiz-Lopez; Carlos A. Cuevas; Christopher S. Blaszczak-Boxe; ..., Environmental Science & Technology, 2016

The chemistry of reactive halogens in the polar atmosphere plays important roles in ozone and mercury depletion events, oxidizing capacity, and dimethylsulfide oxidation to form cloud-condensation nuclei. Among halogen species, the sources and emission mechanisms of inorganic iodine compounds in ...

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Enhanced Phosphate Removal by Nanosized Hydrated La(III) Oxide Confined in Cross-linked Polystyrene Networks

15-Jan-2016 | Yanyang Zhang; Bingcai Pan; Chao Shan; Xiang Gao, Environmental Science & Technology, 2016

A new nanocomposite adsorbent La-201 of extremely high capacity and specific affinity toward phosphate was fabricated and well characterized, where hydrated La(III) oxide (HLO) nanoclusters were immobilized inside the networking pores of the polystyrene anion exchanger D-201. La-201 exhibited ...

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Identification of a Ruminococcaceae Species as the Methyl tert-Butyl Ether (MTBE) Degrading Bacterium in a Methanogenic Consortium

15-Jan-2016 | Tong Liu; Hyeri Ahn; Weimin Sun; Lora R. McGuinness; Lee J. Kerkhof; Max M. Häggblom, Environmental Science & Technology, 2016

The widespread use of methyl tert-butyl ether (MTBE) has caused major contamination of groundwater sources and is a concern due to its taste and odor problems, as well as its toxicity. MTBE can be degraded anaerobically which makes bioremediation of contaminated aquifers a potential solution. ...

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Predicting the Relative Bioavailability of DDT and Its Metabolites in Historically Contaminated Soils Using a Tenax-Improved Physiologically Based Extraction Test (TI-PBET)

13-Jan-2016 | Chao Li; Hongjie Sun; Albert L. Juhasz; Xinyi Cui; Lena Q. Ma, Environmental Science & Technology, 2016

Due to their static nature, physiologically based in vitro assays often fail to provide sufficient sorption capacity for hydrophobic organic contaminants (HOCs). The addition of a sorption sink to in vitro intestinal solution has the potential to mimic dynamic intestinal uptake for HOCs, thereby ...

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Dissolution and Persistence of Copper-Based Nanomaterials in Undersaturated Solutions with Respect to Cupric Solid Phases

13-Jan-2016 | Ronald D. Kent; Peter J. Vikesland, Environmental Science & Technology, 2016

Dissolution of copper-based nanoparticles (NPs) can control their environmental persistence and toxicity. Previous research has generally reported limited dissolution of Cu-based NPs at circumneutral pH, but the environmentally important case of dissolution in solutions that are undersaturated ...

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