THE INFLUENCES OF Fe(III) ION and Fe(OH) 3 COLLOID ON THE PHOTODEGRADATION of p-CHLOROPHENOL CATALYZED BY TiO 2
ABSTRACT: The influences of
ionic Fe(III) and colloidal Fe(OH) 3 on the effectiveness of p-chlorophenol
photodegradation catalyzed by TiO 2 has been studied. Photodegradation was
carried out in a batch system by irradiating a suspension of TiO 2 ,
p-chlorophenol, and Fe(III) as ionic or colloidal forms, using UV lamp for a
period of time accompanied by magnetic stirring. Concentration of photodegraded
p-chlorophenol was calculated by subtracting the initial concentration with
that of undegraded p-chlorophenol. Concentration of undegraded p-chlorophenol
was determined by gas chromatography. In this study, TiO 2 mass and the
photodegradation time were optimized. The influences of concentration of
Fe(III) solution, mass of Fe(OH) 3, and pH of the solution have also been
systematically studied. The research results showed that the presence of
Fe(III) ions improved the effectiveness of photocatalytical degradation of
p-chlorophenol, which was proportional to the concentrations of Fe(III) ion. In
contrast, the increasing mass of Fe(OH) 3 led to a decrease in the degree of
p-chlorophenol photodegradation. Furthermore, it was observed that increasing
pH of the solution resulted in a decrease in the photodegradation of
p-chlorophenol. This phenomena may be due to the different species of TiO 2
available at the surface of photocatalyst and of ionic Fe(III) and colloidal Fe(OH)
3 in the solution resulted from the pH alteration. The highest photodegradation
degree, ca. 80 % was obtained when 20 mg of TiO 2 was applied in the
photodegradation of 50 mL of 100 ppm p-chlorophenol solution in the presence of
100 ppm Fe 3+ irradiated by UV-light for 25 hours.
Author: Endang Tri Wahyuni,
Mudasir and Ngatidjo Hadipranoto
Journal Code: jpkimiagg060028
