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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 ...


Photolysis Kinetics, Mechanisms, and Pathways of Tetrabromobisphenol A in Water under Simulated Solar Light Irradiation

12-May-2015 | Xiaowen Wang; Xuefeng Hu; Hua Zhang; Fei Chang; Yongming Luo, Environmental Science & Technology, 2015

The photolysis of tetrabromobisphenol A (TBBPA) in aqueous solution under simulated solar light irradiation was studied under different conditions to find out mechanisms and pathways that control the transformation of TBBPA during photoreaction. Particular attention was paid to the identification ...


Direct and Complete Phosphorus Recovery from Municipal Wastewater Using a Hybrid Microfiltration-Forward Osmosis Membrane Bioreactor Process with Seawater Brine as Draw Solution

06-May-2015 | Guanglei Qiu; Yi-Ming Law; Subhabrata Das; Yen-Peng Ting, Environmental Science & Technology, 2015

We report a hybrid microfiltration-forward osmosis membrane bioreactor (MF-FOMBR) for direct phosphorus recovery from municipal wastewater in the course of its treatment. In the process, a forward osmosis (FO) membrane and a microfiltration (MF) membrane are operated in parallel in a bioreactor. ...


Anaerobic Arsenite Oxidation by an Autotrophic Arsenite-Oxidizing Bacterium from an Arsenic-Contaminated Paddy Soil

05-May-2015 | Jun Zhang; Wuxian Zhou; Bingbing Liu; Jian He; Qirong Shen; Fang-Jie Zhao, Environmental Science & Technology, 2015

Microbe-mediated arsenic (As) redox reactions play an important role in the biogeochemical cycling of As. Reduction of arsenate [As(V)] generally leads to As mobilization in paddy soils and increased As availability to rice plants, whereas oxidation of arsenite [As(III)] results in As ...


Equilibrium, Kinetics, and Spectroscopic Studies of SF6 Hydrate in NaCl Electrolyte Solution

30-Apr-2015 | Youngrok Seo; Donghyun Moon; Changho Lee; Jeong-Woo Park; Byeong-Soo Kim; Gang-Woo Lee; Pratik Dotel; Jong-Won Lee; ..., Environmental Science & Technology, 2015

Many studies have focused on desalination via hydrate formation; however, for their potential application, knowledge pertaining to thermodynamic stability, formation kinetics, and guest occupation behavior in clathrate hydrates needs to be determined. Herein, the phase equilibria of SF6 hydrates ...


Matrix Normalized MALDI-TOF Quantification of a Fluorotelomer-Based Acrylate Polymer

29-Apr-2015 | Keegan Rankin; Scott A. Mabury, Environmental Science & Technology, 2015

The degradation of fluorotelomer-based acrylate polymers (FTACPs) has been hypothesized to serve as a source of the environmental contaminants, perfluoroalkyl carboxylates (PFCAs). Studies have relied on indirect measurement of presumed degradation products to evaluate the environmental fate of ...


Enhanced Indirect Photochemical Transformation of Histidine and Histamine through Association with Chromophoric Dissolved Organic Matter

23-Apr-2015 | Chiheng Chu; Rachel A. Lundeen; Christina K. Remucal; Michael Sander; Kristopher McNeill, Environmental Science & Technology, 2015

Photochemical transformations greatly affect the stability and fate of amino acids (AAs) in sunlit aquatic ecosystems. Whereas the direct phototransformation of dissolved AAs is well investigated, their indirect photolysis in the presence of chromophoric dissolved organic matter (CDOM) is poorly ...


Exposure of Microcystis aeruginosa to Hydrogen Peroxide under Light: Kinetic Modeling of Cell Rupture and Simultaneous Microcystin Degradation

22-Apr-2015 | Xiangchen Huo; De-Wei Chang; Jing-Hua Tseng; Michael D. Burch; Tsair-Fuh Lin, Environmental Science & Technology, 2015

The effect of hydrogen peroxide on the cell integrity of a cyanobacterium, Microcystis aeruginosa, and on the release and degradation of microcystins (MCs) under simulated sunlight was investigated. The cyanobacterium was exposed to H2O2 in the range of 0–60 mg·L–1 for 3.5 h. Production of OH ...


Enhanced Colloidal Stability of CeO2 Nanoparticles by Ferrous Ions: Adsorption, Redox Reaction, and Surface Precipitation

20-Apr-2015 | Xuyang Liu; Jessica R. Ray; Chelsea W. Neil; Qingyun Li; Young-Shin Jun, Environmental Science & Technology, 2015

Due to the toxicity of cerium oxide (CeO2) nanoparticles (NPs), a better understanding of the redox reaction-induced surface property changes of CeO2 NPs and their transport in natural and engineered aqueous systems is needed. This study investigates the impact of redox reactions with ferrous ...


Membrane-Based Osmotic Heat Engine with Organic Solvent for Enhanced Power Generation from Low-Grade Heat

14-Apr-2015 | Evyatar Shaulsky; Chanhee Boo; Shihong Lin; Menachem Elimelech, Environmental Science & Technology, 2015

We present a hybrid osmotic heat engine (OHE) system that uses draw solutions with an organic solvent for enhanced thermal separation efficiency. The hybrid OHE system produces sustainable energy by combining pressure-retarded osmosis (PRO) as a power generation stage and membrane distillation ...


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