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Depassivation of Aged Fe0 by Divalent Cations: Correlation between Contaminant Degradation and Surface Complexation Constants

20-11-2014 | Tongxu Liu; Xiaomin Li; T. David Waite, Environmental Science & Technology, 2014

The dechlorination of trichloroethylene (TCE) by aged Fe0 in the presence of a series of divalent cations was investigated with the result that while no significant degradation of TCE was observed in Milli-Q water or in solutions of Ba2+, Sr2+, or Ca2+, very effective TCE removal was observed in ...

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Impacts of Ionic Strength on Three-Dimensional Nanoparticle Aggregate Structure and Consequences for Environmental Transport and Deposition

19-11-2014 | Benjamin A. Legg; Mengqiang Zhu; Luis R. Comolli; Benjamin Gilbert; Jillian F. Banfield, Environmental Science & Technology, 2014

The transport of nanoparticles through aqueous systems is a complex process with important environmental policy ramifications. Ferrihydrite nanoparticles commonly form aggregates, with structures that depend upon solution chemistry. The impact of aggregation state on transport and deposition is ...

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Modeling Nonequilibrium Adsorption of MIB and Sulfamethoxazole by Powdered Activated Carbon and the Role of Dissolved Organic Matter Competition

18-11-2014 | Kyle K. Shimabuku; Hyukjin Cho; Eli B. Townsend; Fernando L, Rosario-Ortiz; R. Scott Summers, Environmental Science & Technology, 2014

This study demonstrates that the ideal adsorbed solution theory–equivalent background compound (IAST–EBC) as a stand-alone model can simulate and predict the powdered activated carbon (PAC) adsorption of organic micropollutants found in drinking water sources in the presence of background ...

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Effect of Strong Acid Functional Groups on Electrode Rise Potential in Capacitive Mixing by Double Layer Expansion

17-11-2014 | Marta C. Hatzell; Muralikrishna Raju; Valerie J. Watson; Andrew G. Stack; Adri C. T. van Duin; Bruce E. Logan, Environmental Science & Technology, 2014

The amount of salinity-gradient energy that can be obtained through capacitive mixing based on double layer expansion depends on the extent the electric double layer (EDL) is altered in a low salt concentration (LC) electrolyte (e.g., river water). We show that the electrode-rise potential, which ...

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Arsenic-Rich Acid Mine Water with Extreme Arsenic Concentration: Mineralogy, Geochemistry, Microbiology, and Environmental Implications

14-11-2014 | Juraj Majzlan; Jakub Plášil; Radek Škoda; Johannes Gescher; Felix Kögler; Anna Rusznyak; Kirsten Küsel; Thomas R. Ne ..., Environmental Science & Technology, 2014

Extremely arsenic-rich acid mine waters have developed by weathering of native arsenic in a sulfide-poor environment on the 10th level of the Svornost mine in Jáchymov (Czech Republic). Arsenic rapidly oxidizes to arsenolite (As2O3), and there are droplets of liquid on the arsenolite crust with ...

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IJERPH, Vol. 11, Pages 11645-11663: Community-Based Lifestyle Intervention for Reducing Blood Pressure and Glucose among Middle-Aged and Older Adults in China: A Pilot Study

13-11-2014 | Lin, Aihua ; Zhang, Guanrong ; Liu, Zhiting ; Gu, Jing ; Chen, Weiqing ; Luo, Futian, International Journal of Environmental Research and Public Health, 2014

Although evidence suggests that lifestyle interventions can reduce blood pressure (BP) and glucose levels, there is little information about the feasibility of such interventions when implemented in community settings. This study evaluated the effectiveness of a community-based lifestyle ...

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Role of Air Bubbles Overlooked in the Adsorption of Perfluorooctanesulfonate on Hydrophobic Carbonaceous Adsorbents

13-11-2014 | Pingping Meng; Shubo Deng; Xinyu Lu; Ziwen Du; Bin Wang; Jun Huang; Yujue Wang; Gang Yu; Baoshan Xing, Environmental Science & Technology, 2014

Hydrophobic interaction has been considered to be responsible for adsorption of perfluorooctanesulfonate (PFOS) on the surface of hydrophobic adsorbents, but the long C–F chain in PFOS is not only hydrophobic but also oleophobic. In this study, for the first time we propose that air bubbles on ...

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Arsenic Mobility during Flooding of Contaminated Soil: The Effect of Microbial Sulfate Reduction

12-11-2014 | Edward D. Burton; Scott G. Johnston; Benjamin D. Kocar, Environmental Science & Technology, 2014

In floodplain soils, As may be released during flooding-induced soil anoxia, with the degree of mobilization being affected by microbial redox processes such as the reduction of As(V), Fe(III), and SO42–. Microbial SO42– reduction may affect both Fe and As cycling, but the processes involved and ...

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Effects of Solution Chemistry on Adsorption of Selected Pharmaceuticals and Personal Care Products (PPCPs) by Graphenes and Carbon Nanotubes

10-11-2014 | Fei-fei Liu; Jian Zhao; Shuguang Wang; Peng Du; Baoshan Xing, Environmental Science & Technology, 2014

Adsorption of three selected pharmaceuticals and personal care products (PPCPs) (ketoprofen (KEP), carbamazepine (CBZ), and bisphenol A (BPA)) by two reduced graphene oxides (rGO1 and rGO2) and one commercial graphene was examined under different solution conditions. Single-walled carbon ...

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Microbial Reduction of U(VI) under Alkaline Conditions: Implications for Radioactive Waste Geodisposal

07-11-2014 | Adam J. Williamson; Katherine Morris; Gareth T. W. Law; Athanasios Rizoulis; John M. Charnock; Jonathan R. Lloyd, Environmental Science & Technology, 2014

Although there is consensus that microorganisms significantly influence uranium speciation and mobility in the subsurface under circumneutral conditions, microbiologically mediated U(VI) redox cycling under alkaline conditions relevant to the geological disposal of cementitious intermediate level ...

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