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Efficient Sorption and Removal of Perfluoroalkyl Acids (PFAAs) from Aqueous Solution by Metal Hydroxides Generated in Situ by Electrocoagulation

13-Aug-2015 | Hui Lin; Yujuan Wang; Junfeng Niu; Zhihan Yue; Qingguo Huang, Environmental Science & Technology, 2015

Removal of environmentally persistent perfluoroalkyl acids (PFAAs), that is, perfluorooctanesulfonate (PFOS) and perfluorocarboxylic acids (PFCAs, C4 ∼ C10) were investigated through sorption on four metal hydroxide flocs generated in situ by electrocoagulation in deionized water with 10 mM NaCl ...

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Mechanisms of CO2 Capture into Monoethanolamine Solution with Different CO2 Loading during the Absorption/Desorption Processes

13-Aug-2015 | Bihong Lv; Bingsong Guo; Zuoming Zhou; Guohua Jing, Environmental Science & Technology, 2015

Though the mechanism of MEA-CO2 system has been widely studied, there is few literature on the detailed mechanism of CO2 capture into MEA solution with different CO2 loading during absorption/desorption processes. To get a clear picture of the process mechanism, 13C nuclear magnetic resonance ...

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Mitigation of Salinity Buildup and Recovery of Wasted Salts in a Hybrid Osmotic Membrane Bioreactor–Electrodialysis System

13-Aug-2015 | Yaobin Lu; Zhen He, Environmental Science & Technology, 2015

The osmotic membrane bioreactor (OMBR) is an emerging technology that uses water osmosis to accomplish separation of biomass from the treated effluent; however, accumulation of salts in the wastewater due to water flux and loss of draw solute because of reverse salt flux seriously hinder OMBR ...

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Lipopolysaccharide Density and Structure Govern the Extent and Distance of Nanoparticle Interaction with Actual and Model Bacterial Outer Membranes

12-Aug-2015 | Kurt H. Jacobson; Ian L. Gunsolus; Thomas R. Kuech; Julianne M. Troiano; Eric S. Melby; Samuel E. Lohse; Dehong Hu; ..., Environmental Science & Technology, 2015

Design of nanomedicines and nanoparticle-based antimicrobial and antifouling formulations and assessment of the potential implications of nanoparticle release into the environment requires understanding nanoparticle interaction with bacterial surfaces. Here we demonstrate the electrostatically ...

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Dynamics of Magnesite Formation at Low Temperature and High pCO2 in Aqueous Solution

11-Aug-2015 | Odeta Qafoku; David A. Dixon; Kevin M. Rosso; Herbert T. Schaef; Mark E. Bowden; Bruce W. Arey; Andrew R. Felmy, Environmental Science & Technology, 2015

Magnesite precipitation from aqueous solution, despite conditions of supersaturation, is kinetically hindered at low temperatures for reasons that remain poorly understood. The present study examines the products of Mg(OH)2 reaction in solutions saturated with supercritical CO2 at high pressures ...

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Development of Prediction Models for the Reactivity of Organic Compounds with Ozone in Aqueous Solution by Quantum Chemical Calculations: The Role of Delocalized and Localized Molecular Orbitals

07-Aug-2015 | Minju Lee; Saskia G. Zimmermann-Steffens; J. Samuel Arey; Kathrin Fenner; Urs von Gunten, Environmental Science & Technology, 2015

Second-order rate constants (kO3) for the reaction of ozone with micropollutants are essential parameters for the assessment of micropollutant elimination efficiency during ozonation in water and wastewater treatment. Prediction models for kO3 were developed for aromatic compounds, olefins, and ...

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Evaluation of Surface Sorption Processes Using Spectral Induced Polarization and a 22Na Tracer

05-Aug-2015 | Na Hao; Stephen M. J. Moysey; Brian A. Powell; Dimitrios Ntarlagiannis, Environmental Science & Technology, 2015

We investigate mechanisms controlling the complex electrical conductivity of a porous media using noninvasive spectral induced polarization (SIP) measurements of a silica gel during a pH dependent surface adsorption experiment. Sorption of sodium on silica gel surfaces was monitored as the pH of ...

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Effect of Variations of Washing Solution Chemistry on Nanomaterial Physicochemical Changes in the Laundry Cycle

05-Aug-2015 | Denise M. Mitrano; Yadira Arroyo Rojas Dasilva; Bernd Nowack, Environmental Science & Technology, 2015

Engineered nanoparticle (ENP) life cycles are strongly dependent on the life-cycle of the nanoenhanced products in which they are incorporated. An important phase for ENP associated with textiles is washing. Using a set of liquid and powdered commercially available detergents that span a wide ...

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Probing the Evaporation Dynamics of Mixed SOA/Squalane Particles Using Size-Resolved Composition and Single-Particle Measurements

29-Jul-2015 | Ellis Shipley Robinson; Rawad Saleh; Neil M. Donahue, Environmental Science & Technology, 2015

An analysis of the formation and evaporation of mixed-particles containing squalane (a surrogate for hydrophobic primary organic aerosol, POA) and secondary organic aerosol (SOA) is presented. In these experiments, one material (D62-squalane or SOA from α-pinene + O3) was prepared first to serve ...

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Unraveling Pathways of Guaiacol Nitration in Atmospheric Waters: Nitrite, A Source of Reactive Nitronium Ion in the Atmosphere

27-Jul-2015 | Ana Kroflič; Miha Grilc; Irena Grgić, Environmental Science & Technology, 2015

The tropospheric aqueous-phase aging of guaiacol (2-methoxyphenol, GUA), a lignocellulosic biomass burning pollutant, is addressed in this work. Pathways of GUA nitration in aqueous solution under atmospherically relevant conditions are proposed and critically discussed. The influence of NaNO2 ...

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