e-journal

Sulfate radical-based ferrous–peroxymonosulfate oxidative system for PCBs degradation in aqueous and sediment systems

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Abstract.
Polychlorinated biphenyls (PCBs) in the environment pose long-term risk to public health because of their
persistent and toxic nature. This study investigates the degradation of PCBs using sulfate radical-based
advanced oxidation processes (SR-AOPs). These processes are based on the generation of sulfate radicals
throughiron(Fe(II), Fe(III))mediated activationof peroxymonosulfate (KHSO5,PMS) or persulfate (Na2S2O8,
PS). This study is the first instance for coupling of Fe(II)/Fe(III) with PMS for PCB degradation in aqueous and sediment systems. The high oxidation efficiencies of the free radicals (SO4), in combination with the slow rate of consumption of the oxidants, make these processes very effective for the degradation of recalcitrant organic compounds. The effectiveness of the process was evaluated based on the degradation of a model polychlorinated biphenyl, 2-chlorobiphenyl and total organic carbon (TOC) removal. The kinetics of 2-
chlorobiphenyl degradation along with the effect of oxidant and catalyst concentrations on the degradation
efficiencywasstudied.Near completeremoval of 2-chlorobiphenylwasobservedwhenFe(II)wasused with
PMS or PS. Fe(II) acts as a sulfate radical scavenger at higher concentrations indicating that there is an
optimum concentration of Fe(II) that leads to most effective degradation of the target contaminant. A
chelating agent, sodiumcitrate, was used to control the quantity of iron in the solution for activation of the oxidant. For the first time,westudied the feasibility of the activation ofPMSusing iron citrate complexes for PCB degradation. In the presence of sodiumcitrate, increase in degradation efficiency was observed up to a metal:ligand ratio of 1:2, after which the increase in citrate concentration led to a decrease in removal
efficiency. Fe(II)/PMSsystems were found to be very effective in degrading PCB in a sediment-slurry system
with more than 90% PCB removal being observed within 24 h.

Keywords: AOTs, PCBs, Sulfate radical, Oxone1, Iron

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 85 (2009) 171–179

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

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