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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 2, 2016, pp. 483-492
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Bioline Code: st16043
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 2, 2016, pp. 483-492
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Fe3O4/multi-walled carbon nanotubes as an efficient catalyst for catalytic ozonation of p-hydroxybenzoic acid
Bai, Z. Y.; Yang, Q. & Wang, J. L.
Abstract
Fe3O4/multi-walled carbon nanotubes were
prepared, characterized and used as a nanocatalyst for
ozonation of p-hydroxybenzoic acid. The stability and
reusability of the catalyst was evaluated. Characterization
techniques including X-ray diffraction, Fourier transform
infrared absorption spectroscopy, scanning electron
microscope, high-resolution transmission electron microscopy
and physical property measurement were used to
analyze the reason for the decrease in catalyst activity. The
addition of t-butanol and bicarbonate were used to explore
the different process between hydroxyl radicals and ozone.
The experimental results showed that the catalytic ozonation
could significantly increase the degradation and mineralization
of p-hydroxybenzoic acid. The initial pH value
was a crucial factor influencing ozone decomposition and
the surface property of catalyst or organic pollutant. The
degradation of p-hydroxybenzoic acid increased by 32 %
in catalyzed ozonation compared to single ozonation after
5 min reaction with unadjusted pH (about 5.4). In batch
experiments, the removal efficiency of p-hydroxybenzoic
acid and total organic carbon decreased 36.1 and 6.8 %
after six run times. Bicarbonate significantly inhibited the
mineralization of p-HBA, but it had almost no influence on
the catalytic degradation of p-hydroxybenzoic acid. A
possible pathway for p-hydroxybenzoic acid degradation
was tentatively proposed.
Keywords
Catalytic ozonation; Magnetic carbon nanotube; Degradation pathway; Nanocatalyst
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