Malaysian
Journal of Analytical Sciences Vol 20 No 1 (2016): 171 - 178
MODIFICATION
OF TITANIUM DIOXIDE NANOPARTICLES WITH COPPER OXIDE CO-CATALYST FOR
PHOTOCATALYTIC DEGRADATION OF 2,4-DICHLOROPHENOXYACETIC ACID
(Nanozarah
Titanium Dioksida Terubahsuai Ko–Mangkin Kobalt Oksida untuk Degradasi
Asid
2,4-diklorofenoksiasetik)
Leny Yuliati1*,
Wai Ruu Siah1, Nur Azmina Roslan2, Mustaffa Shamsuddin2,
Hendrik O. Lintang1
1Centre for Sustainable Nanomaterials, Ibnu Sina Institute
for Scientific and Industrial Research
2Department of Chemistry, Faculty of Science
Universiti
Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
*Corresponding author: leny@ibnusina.utm.my
Received: 9
December 2014; Accepted: 3 January 2016
Abstract
2,4-dichlorophenoxyacetic
acid (2,4-D) is a common herbicide that has been used widely. Due to its excessive
usage, the 2,4-D herbicides can cause contamination over agricultural land and
water bodies. In the present work, a simple impregnation method was used to
modify the commercial titanium dioxide (P25 TiO2) nanoparticles with
the copper oxide. The prepared samples were characterized by X-ray Diffraction
(XRD), reflectance UV-visible and fluorescence spectroscopies. It was observed
that the incorporation of copper oxide did not significantly affect the crystal
structure of P25 TiO2. On the other hand, the presence of copper
oxide was confirmed by reflectance UV-visible and fluorescence spectroscopies.
The activity of the prepared sample was evaluated for photocatalytic removal of
the 2,4-D. The photocatalytic activity of the TiO2 increased with
the increase of copper oxide loading up to 0.5 mol%. Unfortunately, the higher
loading amount of copper oxide resulted in the lower photocatalytic activity.
This study suggested that the higher photocatalytic activities obtained on the
low loading samples were due to the lower electron-hole recombination.
Keywords: P25 TiO2,
copper oxide, impregnation, photocatalyst, 2,4-D
herbicide
Abstrak
Asid 2,4-diklorofenoksiasetik (2,4-D)
adalah herbisid biasa yang telah digunakan secara meluas. Oleh kerana
penggunaan yang berlebihan, herbisid 2,4-D boleh menyebabkan pencemaran di kawasan
pertanian dan sistem air. Dalam kajian ini, satu kaedah pengisitepuan
yang mudah telah digunakan untuk mengubahsuai nanozarah titanium dioksida komersial
(P25 TiO2) dengan kuprum oksida. Sampel
yang disediakan telah dicirikan dengan XRD, spektroskopi pantulan serakan ultra
lembayung-cahaya nampak, dan spektroskopi pendarfluor. Didapati pengubahsuaian
P25 TiO2 dengan kuprum oksida tidak memberi kesan yang signifikan
kepada struktur kristal P25 TiO2. Sebaliknya, kehadiran kuprum
oksida telah disahkan oleh spektroskopi pantulan serakan ultra
lembayung-cahaya nampak. Aktiviti sampel telah diuji untuk penyingkiran 2,4-D. Aktiviti fotomangkin TiO2 meningkat
dengan peningkatan jumlah kuprum oksida kepada 0.5 mol%. Malangnya, jumlah
kuprum oksida yang lebih tinggi menghasilkan aktiviti fotomangkin yang lebih
rendah. Kajian ini mencadangkan bahawa aktiviti fotomangkin yang tinggi diperolehi
pada sampel loading rendah adalah disebabkan oleh penggabungan elektron-lubang
yang lebih rendah
Kata kunci: P25 TiO2,
kuprum oksida, pengisitepuan, fotomangkin, 2,4-D
herbisid
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