Sains Malaysiana 39(6)(2010):
975–979
Synthesis
of Titanium Dioxide Microstructures via Sucrose Ester Microemulsion-Mediated
Hydrothermal Method
(Sintesis
Mikrostruktur Titanium Dioksida melalui Kaedah Mikroemulsi Ester Sukrosa dalam
Proses Hidroterma)
S.A.
Zakarya, A. Kassim, H.N. Lim* & N.S. Anwar
Chemistry
Department, Faculty of Science, Universiti Putra Malaysia
43400 UPM Serdang,
Selangor Darul Ehsan, Malaysia
N.M.
Huang
Solid
State Physics Research Laboratory, Physics Department, Faculty of Science
University
of Malaya, 50603 Kuala Lumpur, Malaysia
Diserahkan:
18 September 2009 / Diterima: 2 April 2010
ABSTRACT
Titanium
dioxide particles were successfully prepared using microemulsion-mediated
hydrothermal processing route, with sucrose ester as a stabilising agent. X-ray
diffraction patterns revealed that the particles possessed anatase crystal
phase. Scanning electron micrographs showed micron-sized spherical particles
with rough and smooth surfaces, which eventually interconnected with one
another. The formation mechanism of the titanium dioxide microstructures was
postulated. The as-prepared particles were subjected to photocatalytic
degradation of methylene blue, which exhibited higher photocatalytic activity
compared to their commercial counterpart.
Keywords:
Hydrothermal; microemulsion; sucrose ester; titanium dioxide
ABSTRAK
Zarah
titanium dioksida telah berjaya dihasilkan menerusi kaedah mikroemulsi dalam
proses hidroterma menggunakan ester sukrosa sebagai agen penstabil. Corak
pembelauan sinar-X menunjukkan zarah tersebut terdiri daripada fasa hablur
anatase. Mikrograf elektron imbasan menunjukkan zarah sfera bersaiz mikron
dengan permukaan kasar dan licin yang bercantum antara satu sama lain.
Mekanisme pembentukan mikrostruktur titanium dioksida telah dipostulasikan.
Zarah yang dihasilkan diuji kuasa penguraian fotokatalitik menggunakan metilena
biru dan mempamerkan aktiviti fotokatalitik yang lebih tinggi berbanding dengan
zarah titanium dioksida daripada pasaran.
Kata
kunci: Hidroterma; ester sukrosa; mikroemulsi; titanium dioksida
RUJUKAN
Bakardjieva,
S., Stengl, V., Szatmary, L., Subrt, J., Lukac, J., Murafa, N., Niznansky, D.,
Cizek, K., Jirkovsky, J. & Petrova, N. 2006. Transformation of
brookite-type TiO2 nanoscrystals
to rutile: correlation between the microstructure and photoactivity. Journal
of Materials Chemistry 16: 1709-1716.
Beydoun,
D., Amal, R., Low, G. & Mcevoy, S. 1999. Role of nanoparticles in
photocatalysis. Journal of Nanoparticle Research 1: 439-458.
Bolzinger-Thevenin,
M.A., Grossiord, J.L. & Poelman, M.C. 1999. Characterization of a sucrose
ester microemulsion by freeze fracture electron micrograph and small angle
neutron scattering experiments. Langmuir 15: 2307-2315.
Fujishima,
A. & Honda, K. 1972. Electrochemical photolysis of water at a semiconductor
electrode. Nature 238: 37-38.
Glatter,
O., Orthaber, D., Stradner, A., Scherf, G., M., F., N.,G., Clement, V. &
Leser, M.E. 2001. Sugar-ester nonionic microemulsion: Structural
characterization. Journal of Colloid and Interface Science 241: 215-225.
Kim,
K.D. & Kim, H.T. 2001. Synthesis of TiO2 nanoparticles
by hydrolysis of TEOT and decrease of particle size using a two-stage mixed
method. Powder Technology 119: 164-172.
Kr˘sa,
J., Keppert, M., Jirkovsk, J., Štengl, V. & Šubrt, J. 2004. The effect of
thermal treatment on the properties of TiO2 photocatalyst. Materials Chemistry and Physics 86: 333-339.
Kunieda,
H., Ushio, N., Nakano, A. & Miura, M. 1993. Three-phase behavior in a mixed
sucrose alkanoate and polyethyleneglycol alkyl ether system. Journal of
Colloid and Interface Science 159: 37-44.
Lee,
J.H., Cho, H.J. & Park, S.J. 1991. Preparation of spherical TiO2 powders
by spray pyrolysis using ultrasonic atomization technique. Journal of the
Korean Ceramic Society 28: 831-837.
Li,
G.L. & Wang, G.H. 1999. Synthesis of nanometer-sized TiO2 particles
by a microemulsion method. Nanostructured Materials 11: 663-668.
Lim,
H.N., Kassim, A., Huang, N.M., Hashim, R., Radiman, S., Khiew, P.S. & Chiu,
W.S. 2009. Fabrication and characterization of 1D brushite nanomaterials via
sucrose ester reverse microemulsion. Ceramics International 35:
2891-2897.
Mori,
Y., Okastu, Y. & Tsujimoto, Y. 2001. Titanium dioxide nanoparticles
produced in water-in-oil emulsion. Journal of Nanoparticle Research 3:
219-225.
Ng,
J.D., Lorber, B., Witz, J., Theobald-Dietrich, A., Kern, D. & Giege, R.
1996. The crystallization of biological macromolecules from precipitates:
Evidence for ostwald ripening. Journal Crystal Growth 168: 50-62.
Shon,
H., Phuntsho, S., Okour, Y., Cho, D., Kim, K.S., Li, H.J., Na, S., Kim, J.B.
& Kim, J.H. 2008. Visible light responsive titanium dioxide (TiO2). Journal of the Korean Industrial and Engineering Chemistry 19: 1-16.
Sugimoto,
T. & Zhou, X. 2002. Synthesis of uniform anatase TiO2 nanoparticles
by the gel-sol method 2. Adsorption of OH ions to Ti(OH)4 gel
and TiO2 particles. Journal of Colloid and Interface Science 252: 347-353.
Szczes,
A. 2009. Influence of the surfactant nature on the calcium carbonate synthesis
in water-in-oil emulsion. Journal of Crystal Growth 311: 1129-1135.
Thevenin,
M.A., Grossiord, J.L. & Poelman, M.C. 1996. Sucrose esters/cosurfactant microemulsion
systems for transdermal delivery: assessment of bicontinuous structures. International
Journal of Pharmaceutics 137: 177-186.
Venkatachalam,
N., Palanichamy, M. & Murugesan, V. 2007. Sol–gel preparation and
characterization of alkaline earth metal doped nano TiO2:
Efficient photocatalytic degradation of 4-chlorophenol. Journal of Molecular
Catalysis A: Chemical 273: 177-185.
*Pengarang
untuk surat-menyurat; email: janet_limhn@yahoo.com
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