چكيده
در پروژه حاضر فوتو كاتاليزو TiO2در اندازه نانو در حالت بلور ين آناتاز به روش سل-ژل سنتز شده TiO در پروژه حاضر فوتو كاتاليزور 2
تأ ييد شده و اندازه بلورها با استفاده از معادله XRD است . تشكيل فاز آناتاز تيتانيوم د ي اكس يد با Abstract:
In this work, TiO2 photocatalysts were prepared in nano sizes anatase crystals and
using sol-gel method. The particle sizes were calculated using Scheerer, s equation
and were estimated to be around 11 nm.
In order to improve the photocatalytic reactivity of TiO2, Platinum particles were
loaded on all the catalysts about 1% (w/w) using photoreductive method and 0.5%
(w/w) Cr using chemical method. SEM images show that doping of Pt and Cr
particles is not homogenous and in some places are more than other places.
FT-IR, UV-Vis Reflectance and ICP methods were used to characterize the structure
and properties of photocatalysts.Pellets was synthesized in order to easier usage of
synthesized powder. Present of Si in the synthesis of pellet resulted in the increase of
photocatalytic activity of synthesized pellets. In order to investigate the
photocatalystic activity of TiO2 pellets, degradation of pigments such as Malachite
Green (pH=5), Methyl Orange (pH=2.8) and Methylene Blue (pH=7) under UV and
Visible light irradiation were studied. Catalysts doped whit Pt and Cr compare to
other catalysts display better photocatalytic activity. The main advantages of using
pellets instead of powder are the low cost and easier methods of separation and also
possibility of simpler usage in industry.
Keywords: photocatalyst, pellets, Malachite Green, Methyl Orange, Methylene
