C.A.J. Appelo, M. J. J. Van Der Weiden, Christophe Tournassat, Laurent Charlet
Surface complexation models are commonly used to predict the mobility of trace metals in aquifers. For arsenic in groundwater, surface complexation models cannot be used because the database is incomplete. Both carbonate and ferrous iron are often present at a high concentration in groundwater and w...
Linda C. Roberts, Stephan J. Hug, Thomas Ruettimann, Md Morsaline Billah et al.
Arsenic removal by passive treatment, in which naturally present Fe(II) is oxidized by aeration and the forming iron(III) (hydr)oxides precipitate with adsorbed arsenic, is the simplest conceivable water treatment option. However, competing anions and low iron concentrations often require additional...
Juerg Zobrist, Philip R. Dowdle, James Davis, Ronald S. Oremland
Sulfurospirillum barnesii is capable of anaerobic growth using ferric iron or arsenate as electron acceptors. Cell suspensions of S. barnesii were able to reduce arsenate to arsenite when the former oxyanion was dissolved in solution, or when it was adsorbed onto the surface of ferrihydrite, a commo...
Munmun Basak, Lutfor Rahman, Md. Farid Ahmed, Bristy Biswas et al.
Stephan J. Hug, Laura Canonica, Martin Wegelin, Daniel Gechter et al.
An estimated 30-50 million people in Bangladesh consume groundwater with arsenic contents far above accepted limits. A better understanding of arsenic redox kinetics and simple water treatment procedures are urgently needed. We have studied thermal and photochemical As(III) oxidation in the laborato...
Natalie Mladenov, Yan Zheng, Matthew P. Miller, Diana R. Nemergut et al.
Iron (Fe) and dissolved organic matter (DOM) cycling have been implicated in arsenic mobilization via microbially mediated Fe oxide reduction. To evaluate the sources and multiple roles of DOM in Bangladesh aquifers, we conducted spectroscopic analyses on various types of surface water and groundwat...
Victoria S. Coker, Andrew G. Gault, Carolyn I. Pearce, G. van der Laan et al.
Poorly crystalline Fe(III) oxyhydroxides, ubiquitously distributed as mineral coatings and discrete particles in aquifer sediments, are well-known hosts of sedimentary As. Microbial reduction of these phases is widely thought to be responsible for the genesis of As-rich reducing groundwaters found i...
M. Ashraf Ali, David A. Dzombak
Sorption of phthalic acid, chelidamic acid, and sulfate onto goethite (α-FeOOH) was examined in single-sorbate and in sulfate−organic acid binary-sorbate systems to determine the extent of competition between the simple organic acids and sulfate. Sorption characteristics of sulfate and the organic a...
M. Ashraf Ali, David A. Dzombak
Min Jang, Soo‐Hong Min, Tak-Hyun Kim, Jae Kwang Park
In this study, a simplified and effective method was tried to immobilize iron oxide onto a naturally occurring porous diatomite. Experimental results for several physicochemical properties and arsenic edges revealed that iron oxide incorporated into diatomite was amorphous hydrous ferric oxide (HFO)...
S. Manjura Hoque, Md. Sazzad Hossain, Shamima Choudhury, Shammi Akhter et al.
Biomedical applications of ZnFe2O4 nanoparticle are preferable among all kinds of ferrites due to the compatibility of Zn2+ ions for human bodies. We have followed the soft chemical route to synthesize chitosan and PEG coated ZnFe2O4 nanoparticles and also the chitosan-coated-nanoparticles encapsula...
M. Ashraf Ali, David A. Dzombak
Shaohua Luo, Dong‐bei Hu, Huan Liu, Jun Cong et al.
To recycle the waste and meet the demand for anode materials for Li-ion battery, α-Fe2O3/C for use as anode material is successfully prepared via a simple hydrothermal process using acid-pickled iron oxide red as raw material. The techniques of X-ray diffraction, scanning electron microscopy, transm...
M. G. Mostafa, Yen‐Hua Chen, Jiin‐Shuh Jean, Chia-Chuan Liu et al.
This study discussed the adsorption kinetics of As(V) onto nanosized iron oxide-coated perlite. The effects of pH, initial concentration of As(V) and common anions on the adsorption efficiency were also investigated. It was observed that a 100% As(V) adsorption was achieved at pH value of 4-8 from t...
M. Azizur Rahman, Hiroshi Hasegawa, Kakuya Ueda, Teruya Maki et al.
The uptake of arsenate (As(V)) and dimethylarsinic acid (DMAA) by aquatic macrophyte Spirodela polyrhiza L. was investigated to determine the influence of arsenic interaction with PO4(3-) and Fe ions. Plants were grown hydroponically on standard Murashige and Skoog (MS) culture solutions. Arsenic co...