Synthesis and characterization of MOF-5/TiO2 thin film

Yeoh, Melissa Xiu Jing (2014) Synthesis and characterization of MOF-5/TiO2 thin film. Universiti Malaysia Sabah. (Unpublished)

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Abstract

The major drawbacks of photocatalytic degradation of organic pollutants by TiO₂ are the wide band gap energy of TiO₂ and the rapid recombination between the charge carriers (e-/h+ pairs). These limit the photocatalytic activity of TiO₂ as large amount of solar is still unable to excite the photocatalyst. The MOF-5 / TiO₂ thin film was fabricated by dip-coating a TiOrcoated pyrex tube into a MOF-5 mother solution. XRD analysis of the MOF-5 / TiO₂ thin film confirmed the crystalline structures of anatase Ti02 and MOF-5 respectively. This study utilised MOF-5 / TiO₂/UV-A system in the photocatalytic degradation of methyl orange. The MOF-5 / TiO₂/UV-A system was capable of degrading 34.3 % of 5 ppm of aqueous methyl orange solution after 2 hours compared to 32.2 % by the TiO₂/UV-A system under the same reaction conditions. This shows that the presence of MOF-5 is able to increase the photocatalytic activity of TiO₂. However, the photodegradation efficiency starts to decrease after irradiation time of 3 hours. This could be due to the competition between methyl orange and its intermediate species during the photodegradation process.

Item Type:Academic Exercise
Uncontrolled Keywords:photocatalytic, crystalline structures, photodegradation process, organic pollutants
Subjects:Q Science > QD Chemistry
Divisions:FACULTY > Faculty of Science and Natural Resources
ID Code:14634
Deposited By:IR Admin
Deposited On:06 Jun 2017 11:21
Last Modified:06 Jun 2017 11:21

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