Third Day Poster Session, 17 June 2010 - NanoTR-VI

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Poster Session, Thursday, June 17
Theme F686 - N1123
Investigatons on Solar Degradation of Acid Orange 7 (C.I. 15510) In Textile Waste Water With Micro
And Nano Sized Titan Dioxide
1
1,2
USongül Karaaslan AksuUP P* and eref GüçerP
1,2
1
PDepartment of Chemistry, Faculty of Science & Arts, Uluda University, Bursa 16059 , Turkey
PBUTAL - Bursa Test and Analysis Laboratory, The Scientific and Technological Research Council of Turkey, Bursa 16190, Turkey
Abstract- Solar photo degradation of dyes is not effective in a treatment of textile waste water. Catalytic activation is necassery in order to
have suitible kinetics. Titan dioxide is seem to be effective for dye degradation. Changing the size of catalyst and dopped with other metals (such
as Sn IV) its activity might be improved . Our results shown that solar degradation of studied dye is posiple in a hour radiations.
Textile waste water treatment nowadays is still
environmental problem. Azo dyes represent the largest class
of textile dyes in industrial use, accounting for 50% of all
commercial dyes [1]. Due to the large number of aromatics
present in these molecules and the stability of dyes, most azo
dyes are non-biodegradable [2] and conventional treatment
methods are ineffective for decolorization and degradation.
Physical methods such as adsorption, biological methods
(biodegradation) and chemical methods such as chlorination
and ozonation are the most frequently used methods for
removal of the textile dyes from wastewater. Others are
flocculation, reverse osmosis and adsorption onto activated
carbon. Since they are not destructive but only transfer the
contamination from one phase to another, a different kind of
pollution is faced and further treatments are required. Namely,
advanced oxidation processes have been extensively
investigated [3]. Among these processes, heterogeneous
photocatalysis is found as an emerging destructive technology
leading to total mineralization of most of organic pollutants. In
most cases, the degradation is conducted for dissolved
compounds in water with UV-illuminated TiOR2R. Among
various semiconducting materials most attention has been
given to TiOR2R because of its high photocatalytic activity,
resistance to photo-corrosion, low cost, non-toxicity and
favorable band-gap energy. That is why TiOR2R has real
advantage in the photo-catalytic activity [4–5]. A further
important advantage is the fact that the process can be
powered by natural sunlight [6–8], thus reducing significantly
the electrical power requirements and operating costs. It
should be noted that with visible light, the photo-degradation
processes proceed by different routes, involving for example
electron transfer from the excited state of the dye molecules
adsorbed on the TiOR2R surface into the conduction band of
TiOR2R.
The aim of this study is to investigate the photo catalytic
activities of Acid Orange 7 (AO 7) dye which is frequently
used in textile industry. The rate constant of photo catalytic
reactions were determined by using simulation of solar light
and titanium dioxide as a catalyst . The dye content was
determined by using VIS spectrometry with the wavelength of
AO7: 485 nm and with using derivative spectroscopy. In
kinetic studies, the most important parameters which effect the
observations were matrix of dye solutions, light intensity and
the structure of catalyst. Relevant kinetic data are summarized
Table 2.
Table 1. Summary of rate constants for the degradation of solutions
Sample k t R1/2R (min)
-5
5,71x 10P AO 7 0,00012 1,50E+08
Textile waste water 0,00010 1,75E+08
-5
5,71x 10P O7 +
0,02 g TiOR2R 0,0147 47
Textile waste water
+0,02 g TiOR2R 0,00010 1,75E+08
Textile waste water
+0,02 g (Ti,Sn)OR2R 0,008 87
Using FTIR spectroscopic data, it was shown that dye is
linked to three Titanium surface metallic cations through two
oxygen atoms from the sulfonate group and the oxygen atom
of the carbonyl group of the dyes (Fig 1).
Figure 1. Proposed adsorption mode of AO7 on the surface
Scanning electron microscopy (SEM) was employed the
characterized surface morphology of the catalyst. It can be
seen from Fig. 2
Figure 2. SEM images of AO7- TiOR2
It was shown that decomposition was completed in a hour.
*Corresponding author: songulkar@yahoo.com
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192 (1997)
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Catal. B: Env. 48 83–93 (2004) .
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Temperini, C.Paola, Appl. Catal. B: Env. 69 34–42(2006) .
[6] M. Saquib, M. Muneer , Dyes Pigments;53: 237-49 (2002).
[7] V. Augugliaro, C. Baiocchi, A.B. Prevot, E. Garc´a-Lopez, V.
Loddo, S. Malato, et al. Chemosphere;49.1223–30 (2002).
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6th Nanoscience and Nanotechnology Conference, zmir, 2010 799