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Bulk Dissolution Rates of Cadmium and Bismuth Tellurides As a Function of pH, Temperature and Dissolved Oxygen

14-Apr-2016 | Marc Biver; Montserrat Filella, Environmental Science & Technology, 2016

The toxicity of Cd being well established and that of Te suspected, the bulk, surface-normalized steady-state dissolution rates of two industrially important binary tellurides–polycrystalline cadmium and bismuth tellurides– were studied over the pH range 3–11, at various temperatures (25–70 °C) ...

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Inactivation of Escherichia coli, Bacteriophage MS2, and Bacillus Spores under UV/H2O2 and UV/Peroxydisulfate Advanced Disinfection Conditions

01-Apr-2016 | Peizhe Sun; Corey Tyree; Ching-Hua Huang, Environmental Science & Technology, 2016

Ultraviolet light (UV) combined with peroxy chemicals, such as H2O2 and peroxydisulfate (PDS), have been considered potentially highly effective disinfection processes. This study investigated the inactivation of Escherichia coli, bacteriophage MS2, and Bacillus subtilis spores as surrogates for ...

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XANES Demonstrates the Release of Calcium Phosphates from Alkaline Vertisols to Moderately Acidified Solution

31-Mar-2016 | Karl O. Andersson; Matthew K. Tighe; Christopher N. Guppy; Paul J. Milham; Timothy I. McLaren; Cassandra R. Schefe; ..., Environmental Science & Technology, 2016

Calcium phosphate (CaP) minerals may comprise the main phosphorus (P) reserve in alkaline soils, with solubility dependent on pH and the concentration of Ca and/or P in solution. Combining several techniques in a novel way, we studied these phenomena by progressively depleting P from suspensions ...

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Real-Time Manganese Phase Dynamics during Biological and Abiotic Manganese Oxide Reduction

28-Mar-2016 | Jena E. Johnson; Pratixa Savalia; Ryan Davis; Benjamin D. Kocar; Samuel M. Webb; Kenneth H. Nealson; Woodward W. Fischer, Environmental Science & Technology, 2016

Manganese oxides are often highly reactive and easily reduced, both abiotically, by a variety of inorganic chemical species, and biologically during anaerobic respiration by microbes. To evaluate the reaction mechanisms of these different reduction routes and their potential lasting products, we ...

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Abiotic Protein Fragmentation by Manganese Oxide: Implications for a Mechanism to Supply Soil Biota with Oligopeptides

25-Mar-2016 | Patrick N. Reardon; Stephany S. Chacon; Eric D. Walter; Mark E. Bowden; Nancy M. Washton; Markus Kleber, Environmental Science & Technology, 2016

The ability of plants and microorganisms to take up organic nitrogen in the form of free amino acids and oligopeptides has received increasing attention over the last two decades, yet the mechanisms for the formation of such compounds in soil environments remain poorly understood. We used Nuclear ...

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Oxidative Dissolution of Silver Nanoparticles by Chlorine: Implications to Silver Nanoparticle Fate and Toxicity

25-Mar-2016 | Shikha Garg; Hongyan Rong; Christopher J. Miller; T. David Waite, Environmental Science & Technology, 2016

The kinetics of oxidative dissolution of silver nanoparticles (AgNPs) by chlorine is investigated in this work, with results showing that AgNPs are oxidized in the presence of chlorine at a much faster rate than observed in the presence of dioxygen and/or hydrogen peroxide. The oxidation of AgNPs ...

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Coagulation Behavior of Graphene Oxide on Nanocrystallined Mg/Al Layered Double Hydroxides: Batch Experimental and Theoretical Calculation Study

23-Mar-2016 | Yidong Zou; Xiangxue Wang; Yuejie Ai; Yunhai Liu; Jiaxing Li; Yongfei Ji; Xiangke Wang, Environmental Science & Technology, 2016

Graphene oxide (GO) has attracted considerable attention because of its remarkable enhanced adsorption and multifunctional properties. However, the toxic properties of GO nanosheets released into the environment could lead to the instability of biological system. In aqueous phase, GO may interact ...

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Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides

23-Mar-2016 | Lin Xu; Tao Zheng; Shitong Yang; Linjuan Zhang; Jianqiang Wang; Wei Liu; Lanhua Chen; Juan Diwu; Zhifang Chai; Shuao ..., Environmental Science & Technology, 2016

The permeable reactive barrier (PRB) technique has attracted an increasing level of attention for the in situ remediation of contaminated groundwater. In this study, the macroscopic uptake behaviors and microscopic speciation of Eu(III) on hydroxyapatite (HAP) were investigated by a combination ...

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Mobility of Four Common Mercury Species in Model and Natural Unsaturated Soils

21-Mar-2016 | Ke Gai; Thomas P. Hoelen; Heileen Hsu-Kim; Gregory V. Lowry, Environmental Science & Technology, 2016

Mercury (Hg) occurs as a myriad of species in environmental media, each with different physicochemical properties. The influence of Hg speciation on its transport in unsaturated soils is not well studied. Transport of four Hg species (dissolved inorganic Hg (II) species, a prepared Hg(II) and ...

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Selective Removal of Technetium from Water Using Graphene Oxide Membranes

18-Mar-2016 | Christopher D. Williams; Paola Carbone, Environmental Science & Technology, 2016

The effective removal of radioactive technetium (99Tc) from contaminated water is of enormous importance from an environmental and public health perspective, yet many current methodologies are highly ineffective. In this work, however, we demonstrate that graphene oxide membranes may remove 99Tc, ...

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