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Oxidative removal of 4-nitrophenol using activated carbon fiber and hydrogen peroxide to enhance reactivity of metallophthalocyanine

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Abstract.
We have developed a novel heterogeneous metallophthalocyanine catalyst, Co-TDTAPc–ACF, by
immobilizing cobalt tetra(2,4-dichloro-1,3,5-triazine)aminophthalocyanine (Co-TDTAPc) on activated
carbon fiber (ACF) covalently. The oxidative removal of 4-nitrophenol (4-NP) in the Co-TDTAPc–ACF/
H2O2 system, based on phase transfer catalytic oxidation, was investigated in aqueous solution by ultraperformance liquid chromatography (UPLC). The results indicated that 4-NP could be removed efficiently
by catalytic oxidation in the presence of Co-TDTAPc–ACF and H2O2. In addition, the removal of total
organic carbon of 4-NP accounted for about 90% in 300 min of reaction. Gas chromatography/mass
spectrometry (GC–MS) analysis showed that the residue products were mainly small molecular
compounds such as maleic acid and succinic acid, etc. This system exhibited high catalytic activity across
a wide pH and temperature range. Importantly, compared with homogeneous Co-TDTAPc used alone, the
introduction of ACF contributed specifically to the activity enhancement of Co-TDTAPc. Controlled
experiments showed that the presence of 2-propanol, as hydroxyl radicals scavenger, has little influence
on 4-NP oxidation. The further result of electron paramagnetic resonance (EPR) spin-trap experiments
indicated that free radicals did not dominate the reaction in our system. This paper discusses a possible
catalytic oxidation mechanism of the Co-TDTAPc–ACF/H2O2 system. Repetitive tests showed that Co-
TDTAPc–ACF can maintain high catalytic activity over several cycles, and it has a better regeneration
capability under mild conditions. We conclude that phase transfer catalytic oxidation has proven itself to
be a feasible approach whichmay be potentially applied to the elimination of widely existing pollutants.

Keywords: 4-Nitrophenol, Catalytic oxidation, Removal, Activated carbon fiber, Cobalt phthalocyanine

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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 87 (2009) 146–151

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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