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Hydrodechlorination of trichloroethene using stabilized Fe-Pd nanoparticles: Reaction mechanism and effects of stabilizers, catalysts and reaction conditions

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Abstract.
This study investigated the effects of carboxymethyl cellulose (CMC) as a stabilizer on the reactivity of
CMC-stabilized Fe-Pd bimetallic nanoparticles toward trichloroethene (TCE). Overall, the particle
stabilization prevented particle agglomeration and resulted in greater particle reactivity. The pseudofirst
order TCE degradation rate increased from 0.86 h-1 to 6.8 h-1 as theCMC-to-Fe molar ratio increased
from 0 to 0.0124. However, a higher CMC-to-Fe ratio inhibited the TCE degradation. Within the same
homologous series, CMC of greater molecular weight resulted in more reactive nanoparticles for TCE
hydrodechlorination. Hydrogen (either residual hydrogen from zero-valent iron (ZVI) nanoparticle
synthesis or hydrogen evolved from ZVI corrosion) can serve as effective electron donors for TCE
dechlorination in the presence of Pd (either coated on ZVI or as separate nanoparticles). Decreasing
reaction pH from 9.0 to 6.0 increased the TCE reduction rate by 11.5 times, but enhanced the Fe corrosion
rate by 31.4 times based on the pseudo-first order rate constant. Decreasing pH also shifted the rate
controlling step of TCE reduction from Fe corrosion to hydrodechlorination. Ionic strength (

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis B: Environmental 84 (2008) 533–540

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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