Assessing optical and photocatalytic properties of metal coupled tio2 particles
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Date
2018-06
Authors
Atiikah Ishak
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Abstract
Titanium dioxide (TiO2) is famous of its excellent photocatalytic performance in
organic pollutants and heavy metal removal. However, deposition of heavy metal (after
removal from the solution) on the surface of TiO2 particles might either improve or
deteriorate the performance of TiO2 particles in subsequent degradation of organic
pollutants. In this project, selected heavy metals were deposited onto the surface of
TiO2 particles under both UV and visible light exposure. The removal efficiencies of
each metal ions by TiO2 particles were determined. Generally, TiO2 particles were
more effective in removal the heavy metals under UV light than visible light irradiation
attributed to its wide bandgap. The TiO2 particles removed Cu ions from solution most
effectively, followed by Ag, Ni, Cd, Mn and Cr. These metal ions were deposited onto
the surface of TiO2 particles, producing metal-coupled TiO2 particles. In the
photodegradation of RhB dye study, Cr-, Cu- and Mn-TiO2 particles degraded the RhB
dye in faster rate (larger rate constants) than the other metal-coupled TiO2 particles. It
was noted that the degradation of RhB dye followed 1st order kinetic reaction
regardless the type of metal coupled to TiO2 particles. he reflectivity of metal coupled
TiO2 particles was measured. It was found that Ni-TiO2 particles have the highest
reflectance but slow photodegradation rate. Limitation to use TiO₂ particles in real
application for waste water treatment as waste water is not only contained organic
pollutants but also heavy metals ions that could deteriorate the performance of TiO₂
particles.