A1 Journal article (refereed), original research

Investigation of textural properties and photocatalytic activity of PbO/TiO2 and Sb2O3/TiO2 towards the photocatalytic degradation Benzophenone-3 UV filter


Open Access hybrid publication

Publication Details
Authors: Wang Zhao, Deb Anjan, Srivastava Varsha, Iftekhar Sidra, Ambat Indu, Sillanpää Mika
Publisher: Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Separation and Purification Technology
Volume number: 228
ISSN: 1383-5866
eISSN: 1873-3794
JUFO-Level of this publication: 2
Open Access: Open Access hybrid publication

Abstract

Benzophenone-3 (BP-3) is a widely used organic UV filter in sunscreen
which has been detected in surface and groundwater. BP-3 can affect the
aquatic environment and human health. In this study, PbO/TiO2 and Sb2O3/TiO2
photocatalyst were synthesized for the photocatalytic degradation of
Benzophenone-3 (BP-3) and various degradation parameters such as initial
pH value, initial concentration, and the dose of catalysts were
optimized. Two different TiO2 based catalysts PbO/TiO2 and Sb2O3/TiO2
were synthesized by hydrothermal method. Synthesized photocatalysts
were characterized by X-ray diffraction pattern (XRD), scanning electron
microscope (SEM), Energy Dispersive Spectroscopy (EDS), BET and UV–Vis
DRS techniques. Molar ratio variation of PbO and Sb2O3 with respect to TiO2
significantly affected the surface area, structure, and bandgap of
photocatalyst and hence the variation in degradation efficiency of the
photocatalyst was observed. The BP-3 can be completely degraded by using
PbO/TiO2 within 120 min under UV-C irradiation. The highest
degradation of BP-3 was obtained for the 20 µM concentration at pH 7
when the dose was adjusted to be 0.75 g/L. However, negligible
degradation of BP-3 was demonstrated in the absence of a catalyst.
Moreover, with the catalysts PbO/TiO2 and Sb2O3/TiO2, BP-3 followed the pseudo-first-order kinetics with a rate constant of 3.58 × 10−2 min−1 and 0.92 × 10−2 min−1
respectively. Electron paramagnetic resonance (EPR) spectrum with three
distinct peaks with an intensity of 1:1:1 showed the presence of TEMP-1O2 adduct which suggested the generation of 1O2
(singlet oxygen) in both catalysts. The plausible mechanism of BP-3
degradation was proposed by the Gas chromatography-mass spectrometry
(GC-MS) analysis which showed the formation of pentamethyl- and
5-Hydroxy-7-methoxy-2-methyl-3-phenyl-4-chromenone byproducts on BP-3
photocatalytic degradation by the synthesized catalyst.


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Last updated on 2020-20-03 at 10:03