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Effects of synthesis conditions on the characteristics and reactivity of nano scale zero valent iron

Paper ID Volume ID Publish Year Pages File Format Full-Text
46802 46449 2011 7 PDF Available
Title
Effects of synthesis conditions on the characteristics and reactivity of nano scale zero valent iron
Abstract

Application of nano zero valent iron (NZVI) is an innovative technology for water treatment and soil/groundwater remediation. Among various NZVI synthesis methods, chemical reduction is widely used due to its simplicity and chemical homogeneity. However, the synthesis procedure had not yet been clearly standardized. In this study, the effects of reaction conditions such as reaction time and NZVI concentration on NZVI characteristics and reactivity were investigated. Nanocluster and whisker structures were obtained under fast reduction conditions. The particle size was dramatically decreased from 87.4 nm to 9.5 nm under short reaction time and high reductant concentration. Simultaneously, the BET surface area was increased from 8.4 m2/g to 45.4 m2/g. The reactivity of NZVI was evaluated by a nitrate reduction test. The experimental data were interpreted by pseudo first order kinetics with first order deactivation. The reactivity was increased in the direction of high reductant concentration and fast synthesis, although deactivation increased in the same direction. Among the 4 reaction steps for NZVI synthesis, the nuclei formation step was determined to be the key step in determining NZVI characteristics. Therefore, it is important to control the reaction time and concentration in order to maximize the efficiency of NZVI.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The chemical synthesis condition for NZVI had not yet been clearly standardized. ► We verify the effect of reaction conditions on NZVI characteristics and reactivity. ► NZVI morphology was varied under different reaction time and nuclei concentration. ► The reactivity was increased under high nuclei concentration and fast synthesis. ► The nuclei formation step was the key step in determining NZVI characteristics.

Keywords
Nano zero valent iron; Synthesis; Nucleation time; Reductant delivery rate; Precursor concentration
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 105, Issues 1–2, 9 June 2011, Pages 144–150
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us