Photocatalysis experiments
To investigate photocatalytic activity of the prepared nanoparticles, photodegradation of methylene blue (MB), which is a
typical dye resistant to biodegradation, has been studied.
Photocatalysis experiments were performed in a cylindrical pyrex
reactor of about 400 ml capacity. The reactor was provided with
water circulation arrangement to maintain the temperature at
25 1C. The solution was magnetically stirred and continuously
aerated by a pump to provide oxygen and complete mixing of the
reaction solution. A UV Osram lamp of 125 W and a tungsten
lamp of 300 W were used as UV and visible light sources,
respectively. The lamps were fitted on the top of the reactor.
Prior to illumination, a suspension containing 0.1 g of the
nanoparticle and 250 ml of MB (3 105 mol/L) was continuously
stirred in the dark for 30 min, to attain adsorption equilibrium.
Samples were taken from the reactor at regular intervals and
centrifuged to remove the photocatalyst before analysis by
spectrophotometer at 664 nm corresponding to maximum
absorption wavelength (lmax) of MB
Photocatalysis experimentsTo investigate photocatalytic activity of the prepared nanoparticles, photodegradation of methylene blue (MB), which is atypical dye resistant to biodegradation, has been studied.Photocatalysis experiments were performed in a cylindrical pyrexreactor of about 400 ml capacity. The reactor was provided withwater circulation arrangement to maintain the temperature at25 1C. The solution was magnetically stirred and continuouslyaerated by a pump to provide oxygen and complete mixing of thereaction solution. A UV Osram lamp of 125 W and a tungstenlamp of 300 W were used as UV and visible light sources,respectively. The lamps were fitted on the top of the reactor.Prior to illumination, a suspension containing 0.1 g of thenanoparticle and 250 ml of MB (3 105 mol/L) was continuouslystirred in the dark for 30 min, to attain adsorption equilibrium.Samples were taken from the reactor at regular intervals andcentrifuged to remove the photocatalyst before analysis byspectrophotometer at 664 nm corresponding to maximumabsorption wavelength (lmax) of MB
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