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Multiphase Chemistry of Glyoxal: Revised Kinetics of the Alkyl Radical Reaction with Molecular Oxygen and the Reaction of Glyoxal with OH, NO3, and SO4– in Aqueous Solution

19-Dec-2014 | T. Schaefer; D. van Pinxteren; H. Herrmann, Environmental Science & Technology, 2014

The rate constant for the reaction of the hydrated glyoxyl radical (CH(OH)2-C(OH)2· with O2 has been determined as k298K = (1.2 ± 0.3) × 109 L mol–1 s–1 at pH 4.8. This experimental value is considerably higher than a widely used estimated value of about k = 1 × 106 L mol–1 s–1. As the aqueous ...


Pressure-Induced Metathesis Reaction To Sequester Cs

17-Dec-2014 | Junhyuck Im; Donghoon Seoung; Seung Yeop Lee; Douglas A. Blom; Thomas Vogt; Chi-Chang Kao; Yongjae Lee, Environmental Science & Technology, 2014

We report here a pressure-driven metathesis reaction where Ag-exchanged natrolite (Ag16Al16Si24O80·16H2O, Ag-NAT) is pressurized in an aqueous CsI solution, resulting in the exchange of Ag+ by Cs+ in the natrolite framework forming Cs16Al16Si24O80·16H2O (Cs-NAT-I) and, above 0.5 GPa, its ...


Properties Governing the Transport of Trace Organic Contaminants through Ion-Exchange Membranes

12-Dec-2014 | Marjolein Vanoppen; Annelise F.A.M. Bakelants; Dorien Gaublomme; Klaas V.K.M. Schoutteten; Julie Vanden Bussche; Lyn ..., Environmental Science & Technology, 2014

Ion exchange membranes could provide a solution to the selective separation of organic and inorganic components in industrial wastewater. The phenomena governing the transport of organics through the IEM however, are not yet fully understood. Therefore, the transport of trace organic contaminants ...


Fe(III) Hydroxide Nucleation and Growth on Quartz in the Presence of Cu(II), Pb(II), and Cr(III): Metal Hydrolysis and Adsorption

11-Dec-2014 | Chong Dai; Yandi Hu, Environmental Science & Technology, 2014

Fe(III) hydroxide nanoparticles are an essential carrier for aqueous heavy metals. Particularly, iron hydroxide precipitation on mineral surfaces can immobilize aqueous heavy metals. Here, we used grazing-incidence small-angle X-ray scattering (GISAXS) to quantify nucleation and growth of iron ...


Investigation of Soil Legacy Phosphorus Transformation in Long-Term Agricultural Fields Using Sequential Fractionation, P K-edge XANES and Solution P NMR Spectroscopy

08-Dec-2014 | Jin Liu; Yongfeng Hu; Jianjun Yang; Dalel Abdi; Barbara J. Cade-Menun, Environmental Science & Technology, 2014

Understanding legacy phosphorus (P) build-up and draw-down from long-term fertilization is essential for effective P management. Using replicated plots from Saskatchewan, Canada, with P fertilization from 1967 to 1995 followed by either P fertilization or P cessation (1995–2010), soil P was ...


Reduction of Diffusive Contaminant Emissions from a Dissolved Source in a Lower Permeability Layer by Sodium Persulfate Treatment

26-Nov-2014 | Bridget A. Cavanagh; Paul C. Johnson; Eric J. Daniels, Environmental Science & Technology, 2014

Residual contamination contained in lower permeability zones is difficult to remediate and can, through diffusive emissions to adjacent higher permeability zones, result in long-term impacts to groundwater. This work investigated the effectiveness of oxidant delivery for reducing diffusive ...


Impacts of Diffusive Transport on Carbonate Mineral Formation from Magnesium Silicate-CO2-Water Reactions

25-Nov-2014 | Daniel E. Giammar; Fei Wang; Bin Guo; J. Andrew Surface; Catherine A. Peters; Mark S. Conradi; Sophia E. Hayes, Environmental Science & Technology, 2014

Reactions of CO2 with magnesium silicate minerals to precipitate magnesium carbonates can result in stable carbon sequestration. This process can be employed in ex situ reactors or during geologic carbon sequestration in magnesium-rich formations. The reaction of aqueous CO2 with the magnesium ...


Simultaneous Reduction of Arsenic(V) and Uranium(VI) by Mackinawite: Role of Uranyl Arsenate Precipitate Formation

24-Nov-2014 | Lyndsay D. Troyer; Yuanzhi Tang; Thomas Borch, Environmental Science & Technology, 2014

Uranium (U) and arsenic (As) often occur together naturally and, as a result, can be co-contaminants at sites of uranium mining and processing, yet few studies have examined the simultaneous redox dynamics of U and As. This study examines the influence of arsenate (As(V)) on the reduction of ...


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

20-Nov-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 ...


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

19-Nov-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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