Sains Malaysiana 39(2)(2010): 261–265
Synthesis of Titanium Dioxide Nanoparticles via Sucrose
Ester Micelle-Mediated Hydrothermal Processing Route
(Sintesis Nanozarah Titanium Dioksida melalui Kaedah
Misel Ester Sukrosa dalam Proses Hidroterma)
N.S. Anwar,
A. Kassim, H.N. Lim*, S.A. Zakarya
Chemistry
Department, , Faculty of ScienceUniversiti Putra Malaysia
43400 UPM Serdang, Selangor D.E., Malaysia
N.M. Huang
Solid State
Physics Research Laboratory
Physics
Department, Faculty of Science, University of Malaya
50603 Kuala
Lumpur, Malaysia
Diserahkan: 7
Mei 2009 / Diterima: 3 September 2009
ABSTRACT
Titanium dioxide nanoparticles were synthesized via
low-temperature sucrose ester micelle-mediated hydrothermal processing route
using titanium isopropoxide as the precursor. X-ray diffractometer revealed
that the samples possessed a mixed crystalline phases consisting of anatase and
brookite in which anatase was the main phase. Upon increasing the hydrothermal
reaction temperature, the degree of crystallinity of the nanoparticles improved
and their morphology transformed from bundles of needles to rods and to
spheres. Photocatalytic behaviour of the as-synthesized nanoparticles was
investigated by photodegradation of methylene blue solution in an ultraviolet A
irradiating photoreactor. The as-synthesized nanoparticles exhibited higher
photocatalytic performance as compared to the commercial counterpart.
Keywords: Hydrothermal; nanoparticles; photocatalyst; sucrose
ester; titanium dioxide
ABSTRAK
Nanozarah titanium dioksida disintesis melalui kaedah misel
ester sukrosa dalam proses hidroterma menggunakan titanium isopropoksida
sebagai pemula. Penyerakan sinar-X membuktikan sampel-sampel tersebut
mengandungi campuran fasa hablur yang terdiri daripada anatase dan brokit dengan
anatase merupakan fasa utama. Apabila suhu proses hidroterma ditingkatkan,
darjah penghabluran nanozarah meningkat dan morfologi berubah daripada jarum ke
rod dan ke sfera. Sifat fotokatalitik nanozarah yang dihasilkan diuji menerusi
fotodegradasi larutan metilena biru di dalam fotoreaktor sinaran ultralembayung
A. Nanozarah tersebut mempamerkan aktiviti fotokatalitik yang lebih tinggi
berbanding dengan titanium dioksida yang telah dikomersialkan.
Kata kunci: Ester sukrosa; fotokatalis; Hidroterma; nanozarah
titanium dioksida
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*Pengarang untuk surat-menyurat; email:
janet_limhn@yahoo.com