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Hydroquinone and Quinone-Grafted Porous Carbons for Highly Selective CO2 Capture from Flue Gases and Natural Gas Upgrading

14-Jul-2015 | Jun Wang; Rajamani Krishna; Jiangfeng Yang; Shuguang Deng, Environmental Science & Technology, 2015

Hydroquinone and quinone functional groups were grafted onto a hierarchical porous carbon framework via the Friedel–Crafts reaction to develop more efficient adsorbents for the selective capture and removal of carbon dioxide from flue gases and natural gas. The oxygen-doped porous carbons were ...

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An Ultrahigh Precision, High-Frequency Dissolved Inorganic Carbon Analyzer Based on Dual Isotope Dilution and Cavity Ring-Down Spectroscopy

13-Jul-2015 | Kuan Huang; Nicolas Cassar; Bror Jonsson; Wei-jun Cai; Michael L. Bender, Environmental Science & Technology, 2015

We present a novel method for continuous and automated shipboard measurements of dissolved inorganic carbon concentration ([DIC]) in surface water. The method is based on dual isotope dilution and cavity ring-down spectroscopy (DID-CRDS). In this method, seawater is continuously sampled and mixed ...

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Single Exposure to near Roadway Particulate Matter Leads to Confined Inflammatory and Defense Responses: Possible Role of Metals

10-Jul-2015 | Michal Pardo; Martin M. Shafer; Assaf Rudich; James J. Schauer; Yinon Rudich, Environmental Science & Technology, 2015

Inhalation of traffic-associated atmospheric particulate matter (PM2.5) is recognized as a significant health risk. In this study, we focused on a single (“subclinical response”) exposure to water-soluble extracts from PM collected at a roadside site in a major European city to elucidate ...

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Selective Extraction of Rare Earth Elements from Permanent Magnet Scraps with Membrane Solvent Extraction

09-Jul-2015 | Daejin Kim; Lawrence E. Powell; Lætitia H. Delmau; Eric S. Peterson; Jim Herchenroeder; Ramesh R. Bhave, Environmental Science & Technology, 2015

The rare earth elements (REEs) such as neodymium, praseodymium, and dysprosium were successfully recovered from commercial NdFeB magnets and industrial scrap magnets via membrane assisted solvent extraction (MSX). A hollow fiber membrane system was evaluated to extract REEs in a single step with ...

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Resolution of Adsorption and Partition Components of Organic Compounds on Black Carbons

07-Jul-2015 | Cary T. Chiou; Jianzhong Cheng; Wei-Nung Hung; Baoliang Chen; Tsair-Fuh Lin, Environmental Science & Technology, 2015

Black carbons (BCs) may sequester non-ionic organic compounds by adsorption and/or partition to varying extents. Up to now, no experimental method has been developed to accurately resolve the combined adsorption and partition capacity of a compound on a BC. In this study, a unique “adsorptive ...

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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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