SYNTHESIS OF BLACK TITANIA USING MICROWAVE-ASSISTED HYDROGEN PLASMA
The demand for efficient and environmentally friendly catalysts continues to increase along with the development of industry and technology. One of the promising materials to be developed as a photocatalyst is titania. However, the main weakness of titania material is the large bandgap energy,...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/82773 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The demand for efficient and environmentally friendly catalysts continues to increase along with the
development of industry and technology. One of the promising materials to be developed as a
photocatalyst is titania. However, the main weakness of titania material is the large bandgap energy,
which results in low absorption efficiency in the visible light region. One solution that can be done is
to transform titania into black titania, which has a narrower bandgap energy and more efficient
absorption in the visible light region. Therefore, in this research, black titania was synthesized using
hydrogen plasma under vacuum pressure. The precursor used was Aeroxide Degussa P25 titania, which
was soaked with water to form a slurry. Black titania was synthesized by reducing titania using
hydrogen plasma with a hydrogen gas flow rate of 40 sccm and a pressure in the plasma reactor
chamber of 2-3 Torr. The synthesized black titania with variations in synthesis duration are darkening
in color. Raman characterization of the black titania shows the rutile phase with a small portion of the
anatase phase. Meanwhile, the UV-Vis diffuse reflectance spectroscopy (DRS) characterization shows
an increase in the visible light absorption for synthesis durations above 1 minute. This is also supported
by the results of photoluminescence spectroscopy characterization, which shows peaks due to the
presence of radiative electron recombination processes, originating from new electronic levels due to
crystal defects caused by oxygen vacancies. The synthesized black titania was then applied as a catalyst
in the rhodamine B photodegradation process. The black titania showed an efficiency of 21-40% within
30 minutes. Overall, the effect of hydrogen plasma treatment has an impact on the phase changes and
the formation of crystal defects in titania. |
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