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Photocatalytic degradation of methylparaben by TiO2: Multivariable experimental design and mechanism

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Abstract.
Methylparaben is widely used as a bactericide and as an antimicrobial agent in the formulation of
personal care products (PCPs) such as tooth pastes, deodorants, beauty creams, solar filters, and bath
gels. Owing to a certain estrogenic activity, a possible relationship with breast cancer has been proved
by many researchers. Photocatalytic degradation of methylparaben was carried out in an aqueous
suspension of TiO2 irradiated by ultraviolet light. A multivariable center composite design based on
response surfacemethodologywas applied to estimate the individual and interaction factors including
pH, TiO2 loading, oxygen concentration and light flux. An acceptable semi-empirical expression
(R2 = 0.9896) was obtained via data analysis to predict the response of 50% methylparaben removal
time, and optimal experimental conditions were also achieved thanks to the experimental design (pH 9,
TiO2 loading 2.5 g L-1, dissolved oxygen concentration 18 mg L-1 and light flux 5.8 x 1015 photophotons
s-1 cm-2). Under these conditions, after 6 h of irradiation, 80% of methylparaben mineralization
evaluated through total organic carbon measurement was obtained and 10 photocatalytic
intermediates were identified by GC–MS. In addition, a tentative reaction pathway was proposed.

Keywords: Methylparaben, Photocatalysis, Multivariate experimental design, Mechanism

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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 88 (2009) 32–41

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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