Common oxidants activate the reactivity of zero-valent iron (ZVI) and hence remarkably enhance nitrate reduction from water

2015 ◽  
Vol 146 ◽  
pp. 227-234 ◽  
Author(s):  
Xuejun Guo ◽  
Zhe Yang ◽  
Hong Liu ◽  
Xiaofang Lv ◽  
Qiansi Tu ◽  
...  
Keyword(s):  
Nitrate Reduction ◽  
Zero Valent Iron

Nitrate reduction over nanoscale zero-valent iron prepared by hydrogen reduction of goethite

2012 ◽  
Vol 133 (1) ◽  
pp. 205-211 ◽  
Author(s):  
H.B. Liu ◽  
T.H. Chen ◽  
D.Y. Chang ◽  
D. Chen ◽  
Y. Liu ◽  
...  
Keyword(s):  
Nitrate Reduction ◽  
Hydrogen Reduction ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

Evaluation of nanoscale zero valent iron filled column for nitrate reduction

2018 ◽  
Vol 32 (3) ◽  
pp. 243-251 ◽  
Author(s):  
Youngpyoe Hong ◽  
Younggyo Seo ◽  
Hyowon Kim ◽  
Yuhoon Hwang
Keyword(s):  
Nitrate Reduction ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

scholarly journals Chemical Reduction of Nitrate by Zero-Valent Iron: Shrinking-Core versus Surface Kinetics Models

2020 ◽  
Vol 17 (4) ◽  
pp. 1241 ◽  
Author(s):  
Maria Villen-Guzman ◽  
Juan Manuel Paz-Garcia ◽  
Brahim Arhoun ◽  
Maria del Mar Cerrillo-Gonzalez ◽  
Jose Miguel Rodriguez-Maroto ◽  
...  
Keyword(s):  
Nitrate Reduction ◽  
Chemical Reduction ◽  
Permeable Reactive Barriers ◽  
Zero Valent Iron ◽  
Sound Design ◽  
Surface Kinetics ◽  
Ph Values ◽  
Stirred Reactor ◽  
Constant Ph ◽  
Shrinking Core

Zero valent iron (ZVI) is being used in permeable reactive barriers (PRB) for the removal of oxidant contaminants, from nitrate to chlorinated organics. A sound design of these barriers requires a good understanding of kinetics. Here we present a study of the kinetics of nitrate reduction under relatively low values of pH, from 2 to 4.5. We use a particle size of 0.42 mm, which is within the recommended size for PRBs (0.2 mm to 2.0 mm). In order to avoid possible mass-transfer limitations, a well-stirred reactor coupled with a fluidized bed reactor was used. The experiments were performed at constant pH values using a pH controller that allows to accurately track the amount of acid added. Since the reduction of H + to H 2 by the oxidation of ZVI will always be present for these pH values, blank experiments (without nitrate) were performed and the rate of this H + reduction obtained. This rate of reduction was studied using three kinetic models: a regular empirical one, the Shrinking-Core Model (SCM), and the Surface Kinetics Model (SKM). The best performance was obtained from the SKM model. Therefore, this model was also used to study the results for the nitrate reduction, also with satisfactory results. In both cases, some assumptions are introduced to maintain a moderate number of fitting parameters.

Characteristics of nitrate reduction by zero-valent iron powder in the recirculated and CO2-bubbled system

2006 ◽  
Vol 40 (2) ◽  
pp. 195-204 ◽  
Author(s):  
Chalermchai Ruangchainikom ◽  
Chih-Hsiang Liao ◽  
Jin Anotai ◽  
Ming-Tang Lee
Keyword(s):  
Iron Powder ◽  
Nitrate Reduction ◽  
Zero Valent Iron

Promoting nitrate reduction kinetics by nanoscale zero valent iron in water via copper salt addition

2016 ◽  
Vol 287 ◽  
pp. 367-380 ◽  
Author(s):  
Ahmed M.E. Khalil ◽  
Osama Eljamal ◽  
Skander Jribi ◽  
Nobuhiro Matsunaga
Keyword(s):  
Nitrate Reduction ◽  
Zero Valent Iron ◽  
Copper Salt ◽  
Reduction Kinetics ◽  
Salt Addition ◽  
Nanoscale Zero Valent Iron
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