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-MO NANOCOMPOSITES AND THEIR APPLICATION IN PHOTOCATALYTIC DEGRADATION

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Malaysia Polymer International Conference 2017 (MPIC 2017)

POLYANILINE-TIO

2

-MO NANOCOMPOSITES AND THEIR APPLICATION IN PHOTOCATALYTIC DEGRADATION

Joon Ching Juan 1*, Nur Aziera Jumat2, Wan Jefrey Basirun1, Sook Wai Phang 3 1Nanotechnology & Catalysis Research Centre

2Department of Chemistry, Faculty of Science

Universiti Malaya, 50603 Kuala Lumpur, Wilayah Persekutuan.

3Department of Physical Science, Faculty of Applied Science and Computing, Tunku Abdul Rahman University College, 53300 Kuala Lumpur, Wilayah Persekutuan.

*Corresponding author: jcjuan@um.edu.my

ABSTRACT

A ternary photocatalyst system PAni-TiO2-MO with differing secondary metal oxide; ZnO, Fe3O4 and Mn2O3

was successfully synthesized by template free method. The prepared nanocomposites were characterised by Ultraviolet-visible (UV-vis), Fourier Transform Infrared (FTIR), Raman, X-ray powder diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM). The ternary PAni-TiO2-MO nanocomposites possess nanorod or nanotube structure which occurred through elongation of micelles with PAni encapsulate TiO2 and metal oxide. The photocatalytic activity showed that PAni-TiO2-Fe3O4 exhibited higher photocatalytic activity with 93.3% degradation of Reactive Black 5 (RB5) as compared with PAni-TiO2-ZnO (66.9%) and PAni-TiO2- Mn2O3 (79.3%). The presence of PAni connecting to TiO2 and secondary metal oxide, Fe3O4 has enhanced the separation of electron-hole pair which resulted in better photocatalytic activity than that of TiO2 and PAni-TiO2. In addition, the presence of Fe2+ and Fe3+ in PAni-TiO2-Fe3O4 is indirectly increased the production of OH•

radical via Fenton reaction and thus further accelerate degradation of RB5. Among three different type of secondary metal oxide (ZnO, Fe3O4 and Mn2O3), Fe3O4 has proven to be the best secondary metal oxide in ternary photocatalyst system of PAni-TiO2-MO.

Keywords: PAni, photocatalysis, Reactive Black 5 Dye, titania, iron oxide

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