Photocatalytic degradation of Perchloroethylene by a labscale continuous-flow annular photoreactor packed with glass beads carbon-doped TiO۲ nanoparticles
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 63
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شناسه ملی سند علمی:
JR_AMECJ-4-4_007
تاریخ نمایه سازی: 14 آذر 1402
چکیده مقاله:
In this study, the amount of photocatalytic degradation of
perchloroethylene in the gas phase was investigated by a fixed bed
continuous-flow tubular photoreactor. The photoreactor consists
of a cylindrical glass tube, was filled with glass beads coated with
nanoparticles of TiO۲, and TiO۲ doped carbon (TiO۲-C). These
nanoparticles were synthesized by the sol-gel method and deposited
on glass beads using the sol-gel dip technique. X-ray diffraction
(XRD), scanning electron microscopy (SEM), Fourier transforms
infrared spectroscopy (FT-IR), and diffuse reflectance spectroscopy
(DRS) were used for the characterization of synthesized materials.
The effect of different parameters such as relative humidity, residence
time, PCE concentration on the photocatalytic degradation process
was investigated by ultraviolet irradiation to achieve the highest
possible degradation efficiency. The PCE degradation and byproduct
species were monitored and identified with a gas chromatographymass
spectrometer device (GC-MS). Under the optimum
experimental conditions, the photocatalytic activities of TiO۲, TiO۲-C
were investigated and compared together. The results showed that
photocatalytic activity of TiO۲ for degradation of PCE was extremely
increased when doped with carbon. For TiO۲-C catalyst, under UV
irradiation (۳۰۰۰ ppm initial PCE concentration, ۳۰% humidity and
۱ min residence time) approximately ۹۶% of the initial PCE was
degraded. Also, the catalyst showed high stability over ۴۸ h without
a decrease in catalytically efficiency. All results show that TiO۲-C is a
good candidate for application PCE degradation.
کلیدواژه ها:
TiO۲ nanoparticles ، Photocatalyst ، Chlorinated volatile organic compounds ، Pollutant degradation ، Sol-gel ، Gas chromatography-mass spectrometer
نویسندگان
Hojjat Kazemi
Analytical Chemistry Research Group, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
Mahboubeh Rabbani
Department of Chemistry, Iran University of Science and Technology, Narmak, Tehran, Iran
Haniye Kashafroodi
Department of Chemistry, Iran University of Science and Technology, Narmak, Tehran, Iran
Hossin Kazemi
Analytical Chemistry Research Group, Research Institute of Petroleum Industry (RIPI), Tehran, Iran