Fotodegradasi Zat Warna Alizarin S Menggunakan TiO2-Zeolit dan Sinar UV
ABSTRACT: An investigation of
Alizarin S photodegradation using TiO2-zeolite and UV radiation was performed.
TiO2-zeolite was prepared by dispersing oligocations of titanium into
suspension of zeolite. The suspension was stirred and then filtered to separate
the solid phase from the filtrate. the solid phase was calcined by microwave
oven at 800 Watt for 5 minutes to convert the oligocations into its oxide
forms. The calcined product and unmodified zeolite were characterized using
x-ray diffractometry, FT-IR spectrophotometry, X-ray fluorescence and gas
sorption analysis methods to determine their physicochemical properties.
Photocatalytic activity of TiO2-zeolite was tested on Alizarin S solution using
following method: 50 mg of zeolite was dispersed into 25 mL of 10-4 M Alizarin
S. The dispersion was irradiated using 365 nm UV light at room temperature on
various irradiation times, i.e. 10, 20, 30, 40 and 60 minutes. At certain
irradiation time, the dispersion was filtered and the filtrate was then analyzed
its concentration using UV-Vis spectrophotometry method. Characterization
results exhibited that the formation of TiO2 on internal as well as external
surfaces of zeolite could not be detected
with x-ray diffractometry and FT-IR spectrophotometry, however
determination of titanium using x-ray fluorescence analysis on the calcined
product showed that the concentration of titanium was much higher than zeolite
(0.22% on zeolite and 12.08% on TiO2-zeolite). Gas sorption analysis result
indicated that the the calcination
resulted in the increase of specific surface area (16,31 m2/g on zeolite
and 100.96 m2/g on TiO2-zeolite) as well as total pore volume of calcined
product (13.34 mL/Å/g on zeolite and 57.54 mL/Å/g on TiO2-zeolite). The result
of photocatalytic activitiy study showed that ca 99 % of Alizarin S was
degraded by TiO2-zeolite after UV irradiation for 60 min.
Penulis: Karna Wijaya, Eko
Sugiharto, Is Fatimah, Iqmal Tahir, Rudatiningsih
Kode Jurnal: jpkimiadd060051
