TY - GEN
T1 - Characteristics of nanoscale zero-valent iron (NZVI) particles formed under controlled air contact
AU - Kim, Hong Seok
AU - Ahn, Jun Young
AU - Hwang, Kyung Yup
AU - Shin, Won Sik
AU - Hwang, Inseong
PY - 2008
Y1 - 2008
N2 - Nanoscale zero-valent iron (NZVI) particles that were resistant to aerial oxidation were synthesized by controlled contact of fresh NZVI (Toda Corp., Japan) particles with atmospheric oxygen, and their characteristics were studied. The NZVI particles were effective in dechlorinating TCE with a pseudo-first-order rate constant of about 0.36/hr and maintained their reducing capacity even after 10 days of aerial exposure. A repetitive TCE injection test revealed that a gram of the NZVI could degrade 0.10 mmoles of TCE. The TEM and XPS analyses indicated that the NZVI particles have shells with the thickness of about 5nm and consisted of Fe(0), magnetite, and other iron oxides. Further, passivation/depassivation characteristics of the NZVI particles in water were investigated. On the other hand, NZVI particles that had uncontrolled contact with the atmospheric oxygen exhibited pyrophoric characteristics. These particles showed low TCE degradation efficiencies and did not appear to have shell layers.
AB - Nanoscale zero-valent iron (NZVI) particles that were resistant to aerial oxidation were synthesized by controlled contact of fresh NZVI (Toda Corp., Japan) particles with atmospheric oxygen, and their characteristics were studied. The NZVI particles were effective in dechlorinating TCE with a pseudo-first-order rate constant of about 0.36/hr and maintained their reducing capacity even after 10 days of aerial exposure. A repetitive TCE injection test revealed that a gram of the NZVI could degrade 0.10 mmoles of TCE. The TEM and XPS analyses indicated that the NZVI particles have shells with the thickness of about 5nm and consisted of Fe(0), magnetite, and other iron oxides. Further, passivation/depassivation characteristics of the NZVI particles in water were investigated. On the other hand, NZVI particles that had uncontrolled contact with the atmospheric oxygen exhibited pyrophoric characteristics. These particles showed low TCE degradation efficiencies and did not appear to have shell layers.
UR - https://www.scopus.com/pages/publications/77955915902
M3 - Conference contribution
AN - SCOPUS:77955915902
SN - 9780841269941
T3 - ACS National Meeting Book of Abstracts
BT - American Chemical Society - 236th National Meeting and Exposition, Abstracts of Scientific Papers
T2 - 236th National Meeting and Exposition of the American Chemical Society, ACS 2008
Y2 - 17 August 2008 through 21 August 2008
ER -