Browsing by Author "AL-NASERI, Hiba Alaa Majeed"
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thesis.listelement.badge DETERMINATION OF PHOTOCATALYTIC DEGRADATION PRODUCTS OF DYE MOLECULES FOUNDED IN TEXTILE WASTEWATER(2017-06-02) AL-NASERI, Hiba Alaa Majeed; KAYA, MuratPhotocatalytic process is widely applied to remove hazardous organic compounds, microorganisms founded in water, volatile organic compounds and plastics waste by decomposing and destructing them founded in wastes. In this process, oxidation and reduction reactions occur on the surface of photocatalytic materials with the help of conduction band electrons and holes generated on valence band under ultraviolet (UV) or visible light radiation. Among the wastes mentioned above, textile based waste water is so important due to the highly toxic dye contents. Characterization of the degradation products of dye molecules obtained at the end of the process is so important in order to reveal the properties of them. Also characterization of the intermediates is so important to find the degradation pathways. Degradation products and intermediates can be followed by two different ways. In the first one the color of the solution is followed with UV-vis spectrometry. In the second way the final products can be founded with gas or liquid chromatography coupled with different types of detectors like flame ionization (FID), thermal conductivity (TCD) and mass (MS). This study is related to find the photocatalytic degradation products of dye molecules founded in textile wastewaters. For this, photocatalytic degradation products of methylene blue (MB) were investigated which are produced in the presence of TiO2 nanoparticles and palladium nanoparticles added PEDOT (PdNPs/PEDOT) under UV irradiation by using UV spectroscopy and liquid chromatography-mass spectrometry (LC-MS). The obtained results showed that the initial structure of MB was decomposed under UV light exposure in both the photocatalytic reactions in which TiO2 nanoparticles and palladium nanoparticles loaded PEDOT (PdNPs/PEDOT) were used. TiO2 nanoparticles are widely used in photocatalytic dye decomposition reactions and degradation products and pathway are given in literature. The results obtained in this study for the photocatalytic degradation of MB with TiO2 nanoparticles under UV light exposure are in consistent with the literature. In the case of PdNPs/PEDOT, new catalyst, the main degradation products are similar to those obtained with TiO2 nanoparticles. So, it can be concluded that photocatalytic degradation of MB by using PdNPs/PEDOT followed the same degradation pathway as TiO2 nanoparticles under UV light exposure. Besides this work provides a good insight into the decomposition products and pathway for the PdNPs/PEDOT assisted photocatalytic degradation of MB molecules under UV light irradiation.