Titan Dioksida Terdispersi Pada Zeolit Alam (TiO2/Zeolit) dan Aplikasinya untuk Fotodegradasi Congo Red
ABSTRACT: The utilization of
TiO2 dispersed on natural zeolite (TiO2/Zeolite) for degradation of Congo Red
photocatlytically has been performed. The TiO2/Zeolite was prepared by
mechanically mixing of 100 g of natural zeolite, which it has been heated at
400oC, with TiO2 powder, the final weight ratio of the mixture was 5% (w/w).
The mixture was then calcined at 400oC for 6 hours. The calcined product was
characterized using x-ray diffractometry, x-ray fluorescence analysis and gas
sorption analysis methods to determine its physicochemical properties changes
caused by mixing and calcination. Investigation of Congo Red photodegradation
using TiO2/Zeolite was carried out by mixing 25 mL 10-4 M solution of Congo Red
with 25 mg of TiO2/Zeolite and irradiating the suspention with UV-light of 350
nm for 10, 20, 30, 40, 50 and 60 minutes, respectively. The characterization
results showed that dispertion of TiO2 on zeolite resulted in the increasing of
titanium concentration on TiO2/Zeolite. The concentration of Ti on natural
zeolite was found to be 0.15%(w/w), meanwhile on TiO2/Zeolite was 2.29% (w/w).
From X-ray diffractometry analysis result no information was found that TiO2
was dipersed on natural zeolite. It was caused by overlapping of the
reflections of zeolite with reflections of TiO2. On the otherhand, the gas
sorption analysis result exhibited that the dispersion of TiO2 on zeolite
resulted in the decreasing of total pore volume as well as specific surface
area of the natural zeolite. The specific surface areas of natural zeolite and
TiO2/Zeolite were 21.98 and 16.74 m2/g, respectively, meanwhile the total pore
volumes of natural zeolite and TiO2/Zeolite were 20.10x10-3 and 13.47x10-3
mL/g. The simple kinetic of photodegradation of Congo Red exhibited that the
rate of degradation followed a first order kinetic and the reaction rate
constant was 0.0017 minute-1.
Penulis: Is Fatimah, Eko
Sugiharto, Karna Wijaya, Iqmal Tahir, Kamalia
Kode Jurnal: jpkimiadd060052
