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Photocatalytic degradation of methyl orange using polymer–titania microcomposites

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Abstract.
Photodegradation of an organic dye was studied experimentally using novel polymer–titania microcomposites.
These microcomposites were prepared from titanium dioxide (TiO2) nanoparticles embedded
within cross-linked, thermally-responsive microgels of poly(N-isopropylacrylamide) and contained
interpenetrating linear chains of poly(acrylic acid) that functionalize the nanoparticles of TiO2. Because
these microcomposites settle more than a hundred times faster than freely suspended TiO2 nanoparticles,
they are extremely useful for simple gravity separation of the photocatalyst in applications that
employ titania nanoparticles. Methyl orange (MO) was used as a model contaminant to investigate the
degradation kinetics using the microcomposites in aqueous suspensions. Kinetics of the photodegradation
were evaluated by monitoring the changes in methyl orange concentration using UV–Vis spectroscopy.
The photocatalytic behavior of functional microcomposites containing 65 wt% titania was studied and
the influence of the solution pH as well as the total titania concentration in solution was explored.
The results indicated that pH of the solution changes the surface interactions between the poly(acrylic
acid), titania, and methyl orange and this interplay determined the overall degradation kinetics of the
chemical contaminants. Nearly identical reaction rate constants were observed in acidic solutions for the
microcomposites when compared to freely suspended titania. The latter showed higher rate constants
than the microcomposites at a neutral pH. Release of the titania from the microcomposites was observed
under basic conditions. Complete degradation of the microcomposites was observed after prolonged (7–
13 h) UV irradiation. However, the microcomposites were easily regenerated by addition of microgels and
no loss of photocatalytic activity was observed.

Keywords:
Photodegradation
Microcomposites
Photocatalyst
Titania nanoparticles

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 333 (2009) 457–464

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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