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Titolo:
Kinetics of reductive denitrification by nanoscale zero-valent iron
Autore:
Choe, S; Chang, YY; Hwang, KY; Khim, J;
Indirizzi:
Korea Univ, Dept Civil & Environm Engn, Seoul 136701, South Korea Korea Univ Seoul South Korea 136701 ronm Engn, Seoul 136701, South Korea Korea Inst Sci & Technol, Environm Remediat Res Ctr, Seoul 136650, South Korea Korea Inst Sci & Technol Seoul South Korea 136650 ul 136650, South Korea Kwangwoon Univ, Dept Environm Engn, Seoul 139701, South Korea Kwangwoon Univ Seoul South Korea 139701 Engn, Seoul 139701, South Korea
Titolo Testata:
CHEMOSPHERE
fascicolo: 8, volume: 41, anno: 2000,
pagine: 1307 - 1311
SICI:
0045-6535(200010)41:8<1307:KORDBN>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Keywords:
denitrification; nanoscale Fe-0; pseudo first-order; iron content; mixing intensity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Khim, J Korea Univ, Dept Civil & Environm Engn, 5-Ka, Seoul 136701, South Korea Korea Univ 5-Ka Seoul South Korea 136701 eoul 136701, South Korea
Citazione:
S. Choe et al., "Kinetics of reductive denitrification by nanoscale zero-valent iron", CHEMOSPHERE, 41(8), 2000, pp. 1307-1311

Abstract

Zero-valent iron powder (Fe-0) has been determined to be potentially useful for the removal of nitrate in the water environment. This research is aimed at subjecting the kinetics of denitrification by nanoscale Fe-0 to an analysis of factors affecting the chemical denitrification of nitrate, Nanoscale iron particles with a diameter in the range of 1-100 nm, which are characterized by the large BET specific surface area to mass ratio (31.4 m(2)/g), removed mostly 50, 100, 200, and 400 mg/l of nitrate within a period of 30 min with little intermediates. Compared with microscale (75-150 mu m) Fe-0, endproduct is not ammonia but N-2 gas. Kinetics analysis from batch studies revealed that the denitrification reaction with nanoscale Fe-0 appeared to be a pseudo first-order with respect to substrate and the observed reaction rate constant (k(obs)) varied with iron content at a relatively low degree of application. The effects of mixing intensity (rpm) on the denitrification rate suggest that the denitrification appears to be coupled with oxidative dissolution of iron through a largely mass transport-limited surface reaction (<40 rpm). (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:51:56