Abstracts Book - IMRC 2018

• SA6-O008
SYNTHESIS AND CHARACTERIZATION OF TiO2 NANOPARTICLES
IN ANATASE AND ANATASE-BROOKITE PHASE ON CARBON
NANOTUBES
Gabriel Marcelo de Jesús Rosado 1 , Ysmael Verde Gomez 1 , Mario Miki Yoshida 2 , Ana María
Valenzuela Muñiz 1
1
Instituto Tecnológico de Cancún, Departamento de posgrado e investigación, Mexico. 2 Centro
de Investigación en Materiales Avanzados, S.C., , Mexico.
Titanium dioxide nanoparticles have a wide spectrum of applications
photocatalysts to personal care products (PCPs), like biodegradable sunscreens.
TiO2 is an attractive material due to its low cost and chemical stability, moreover,
is environmental friendly and possesses a strong oxidizing power. Some of the
main applications are the degradation of organic pollutants in water, hydrogen
production, dye sensitized solar cells and lithium batteries among others. TiO2
has three different crystalline phases: anatase, rutile and brookite. Anatase is
the most commonly used not only for its higher photoactivity than rutile but also
because is easier to obtain than brookite. The disadvantage of using only TiO2
nanoparticles as photocatalyst is the rapid recombination of photogenerated
electron-hollow pairs. This can be avoided with the presence of more than one
phase of TiO2 (i. e. anatase-rutile or anatase-brookite mixture), or using a
carbonaceous support such as the multiwalled carbon nanotubes (MWCNT). In
this research work, TiO2 nanoparticles in anatase and anatase-brookite phases
were synthetized by sol-gel method, and deposited on MWCNT. A solution of
Titanium (IV) Isopropoxide was mixed with MWCNT by ultrasonication, the
suspension was kept in an ice bath near to 0 o C, and a certain amount of water
was added for the hydrolysis reaction. Anatase phase was obtained placing the
so-gel product in a thermal treatment at 400 0 C during 2 hours. For anatasebrookite
mixture, the sol-gel product was placed in a reflux system at 80 0 C
during 5 hours. Once the solution was cooled at room temperature, the pH was
adjusted to 2. Finally, after a filtration process, the obtained material was dried
and subjected to thermal treatment at 400 0 C. The materials were analyzed
physically and chemically by scanning and transmission electron microscopy,
energy dispersive X-ray spectroscopy, thermogravimetric analysis, Raman
spectroscopy, surface area analysis (BET method) and X-ray diffraction. A
detailed discussion about the influence of the synthesis methodology on the
TiO2 crystalline phases, particles size, surface area, chemical composition and
distribution on the MWCNT will be presented at the conference.