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Iron Atom Exchange between Hematite and Aqueous Fe(II)

26-Jun-2015 | Andrew J. Frierdich; Maria Helgeson; Chengshuai Liu; Chongmin Wang; Kevin M. Rosso; Michelle M. Scherer, Environmental Science & Technology, 2015

Aqueous Fe(II) has been shown to exchange with structural Fe(III) in goethite without any significant phase transformation. It remains unclear, however, whether aqueous Fe(II) undergoes similar exchange reactions with structural Fe(III) in hematite, a ubiquitous iron oxide mineral. Here, we use ...

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Geochemical Triggers of Arsenic Mobilization during Managed Aquifer Recharge

25-Jun-2015 | Sarah Fakhreddine; Jessica Dittmar; Don Phipps; Jason Dadakis; Scott Fendorf, Environmental Science & Technology, 2015

Mobilization of arsenic and other trace metal contaminants during managed aquifer recharge (MAR) poses a challenge to maintaining local groundwater quality and to ensuring the viability of aquifer storage and recovery techniques. Arsenic release from sediments into solution has occurred during ...

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Aerobic Biotransformation of Fluorotelomer Thioether Amido Sulfonate (Lodyne) in AFFF-Amended Microcosms

23-Jun-2015 | Katie C. Harding-Marjanovic; Erika F. Houtz; Shan Yi; Jennifer A. Field; David L. Sedlak; Lisa Alvarez-Cohen, Environmental Science & Technology, 2015

The aerobic biotransformation pathways of 4:2, 6:2, and 8:2 fluorotelomer thioether amido sulfonate (FtTAoS) were characterized by determining the fate of the compounds in soil and medium microcosms amended with an aqueous film-forming foam (AFFF) solution. The biotransformation of FtTAoS ...

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Formation of Light Absorbing Soluble Secondary Organics and Insoluble Polymeric Particles from the Dark Reaction of Catechol and Guaiacol with Fe(III)

15-Jun-2015 | Samantha Slikboer; Lindsay Grandy; Sandra L. Blair; Sergey A. Nizkorodov; Richard W. Smith; Hind A. Al-Abadleh, Environmental Science & Technology, 2015

Transition metals such as iron are reactive components of environmentally relevant surfaces. Here, dark reaction of Fe(III) with catechol and guaiacol was investigated in an aqueous solution at pH 3 under experimental conditions that mimic reactions in the adsorbed phase of water. Using UV–vis ...

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Charge, Size, and Cellular Selectivity for Multiwall Carbon Nanotubes by Maize and Soybean

05-Jun-2015 | Guangshu Zhai; Sarah M. Gutowski; Katherine S. Walters; Bing Yan; Jerald L. Schnoor, Environmental Science & Technology, 2015

Maize (Zea mays) and soybean (Glycine max) were used as model food-chain plants to explore vegetative uptake of differently charged multiwall carbon nanotubes (MWCNTs). Three types of MWCNTs, including neutral pristine MWCNT (p-MWCNT), positively charged MWCNT-NH2, and negatively charged ...

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Modular Advanced Oxidation Process Enabled by Cathodic Hydrogen Peroxide Production

03-Jun-2015 | James M. Barazesh; Tom Hennebel; Justin T. Jasper; David L. Sedlak, Environmental Science & Technology, 2015

Hydrogen peroxide (H2O2) is frequently used in combination with ultraviolet (UV) light to treat trace organic contaminants in advanced oxidation processes (AOPs). In small-scale applications, such as wellhead and point-of-entry water treatment systems, the need to maintain a stock solution of ...

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Impact of Iron-Reducing Bacteria on the Corrosion Rate of Carbon Steel under Simulated Geological Disposal Conditions

02-Jun-2015 | Marta K. Schütz; Michel L. Schlegel; Marie Libert; Olivier Bildstein, Environmental Science & Technology, 2015

The current projects for the disposal of high-level radioactive waste rely on underground burial and confinement by metallic envelopes that are susceptible to corrosion processes. The impact of microbial activity must be fully clarified in order to provide biological parameters for predictive ...

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Heterogeneous Degradation of Organic Pollutants by Persulfate Activated by CuO-Fe3O4: Mechanism, Stability, and Effects of pH and Bicarbonate Ions

21-May-2015 | Yang Lei; Chuh-Shun Chen; Yao-Jen Tu; Yao-Hui Huang; Hui Zhang, Environmental Science & Technology, 2015

Magnetic CuO-Fe3O4 composite was fabricated by a simple hydrothermal method and characterized as a heterogeneous catalyst for phenol degradation. The effects of pH and bicarbonate ions on catalytic activity were extensively evaluated in view of the practical applications. The results indicated ...

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Effective Nitrogen Removal and Recovery from Dewatered Sewage Sludge Using a Novel Integrated System of Accelerated Hydrothermal Deamination and Air Stripping

21-May-2015 | Chao He; Ke Wang; Yanhui Yang; Prince Nana Amaniampong; Jing-Yuan Wang, Environmental Science & Technology, 2015

In order to reduce considerable emissions of N-containing pollutants from combustion of sewage sludge derived solid fuel, an integrated system of hydrothermal deamination and air stripping was developed to effectively remove and recover nitrogen from dewatered sewage sludge (DSS). Three ...

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Particle Coating-Dependent Interaction of Molecular Weight Fractionated Natural Organic Matter: Impacts on the Aggregation of Silver Nanoparticles

15-May-2015 | Yongguang Yin; Mohai Shen; Zhiqiang Tan; Sujuan Yu; Jingfu Liu; Guibin Jiang, Environmental Science & Technology, 2015

Ubiquitous natural organic matter (NOM) plays an important role in the aggregation state of engineered silver nanoparticles (AgNPs) in aquatic environment, which determines the transport, transformation, and toxicity of AgNPs. As various capping agents are used as coatings for nanoparticles and ...

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