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Determination of Photocatalytic Degradation Products of Dye Molecules Founded in Textile Wastewater

BROWSE_DETAIL_CREATION_DATE: 11-07-2017

BROWSE_DETAIL_IDENTIFIER_SECTION

BROWSE_DETAIL_TYPE: Thesis

BROWSE_DETAIL_SUB_TYPE: Masters

BROWSE_DETAIL_PUBLISH_STATE: Unpublished

BROWSE_DETAIL_FORMAT: PDF Document

BROWSE_DETAIL_LANG: English

BROWSE_DETAIL_SUBJECTS: Chemistry, Chemical engineering,

BROWSE_DETAIL_CREATORS: Al-Naseri, Hiba Alaa Majeed (Author),

BROWSE_DETAIL_CONTRIBUTERS: Kaya, Murat (Advisor),

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Textile wastewaters, photocatalytic degradation, degradation products,methylene blue, photocatalyst


BROWSE_DETAIL_TAB_ABSTRACT

Photocatalytic process is widely applied to remove hazardous organic compounds,microorganisms founded in water, volatile organic compounds and plastics wasteby decomposing and destructing them founded in wastes. In this process, oxidationand reduction reactions occur on the surface of photocatalytic materials with thehelp of conduction band electrons and holes generated on valence band underultraviolet (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 endof the process is so important in order to reveal the properties of them. Alsocharacterization of the intermediates is so important to find the degradationpathways.Degradation products and intermediates can be followed by two different ways. Inthe first one the color of the solution is followed with UV-vis spectrometry. In thesecond way the final products can be founded with gas or liquid chromatographycoupled with different types of detectors like flame ionization (FID), thermalconductivity (TCD) and mass (MS).vThis study is related to find the photocatalytic degradation products of dyemolecules founded in textile wastewaters. For this, photocatalytic degradationproducts of methylene blue (MB) were investigated which are produced in thepresence of TiO2 nanoparticles and palladium nanoparticles added PEDOT(PdNPs/PEDOT) under UV irradiation by using UV spectroscopy and liquidchromatography-mass spectrometry (LC-MS).The obtained results showed that the initial structure of MB was decomposed underUV light exposure in both the photocatalytic reactions in which TiO2 nanoparticlesand palladium nanoparticles loaded PEDOT (PdNPs/PEDOT) were used. TiO2nanoparticles are widely used in photocatalytic dye decomposition reactions anddegradation products and pathway are given in literature. The results obtained inthis study for the photocatalytic degradation of MB with TiO2 nanoparticles underUV light exposure are in consistent with the literature. In the case ofPdNPs/PEDOT, new catalyst, the main degradation products are similar to thoseobtained with TiO2 nanoparticles. So, it can be concluded that photocatalyticdegradation of MB by using PdNPs/PEDOT followed the same degradationpathway as TiO2 nanoparticles under UV light exposure. Besides this workprovides a good insight into the decomposition products and pathway for thePdNPs/PEDOT assisted photocatalytic degradation of MB molecules under UVlight irradiation.


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