Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Preparation and Characterization of Nano ZnTiO₃ Catalysts and

Investigation of Their Photocatalytic Activities

It is important to remove organic compounds in aqueous media for environment and human health. It is necessary to find effective methods for degradation to less harmful compounds or complete oxidation of these pollutants. In recent years, new treatment methods called advanced oxidation Technologies have received increasing attention. Advanced oxidation Technologies represent a valuable alternative for the elimination of toxic organic contaminants.

The aim of this study was to synthesize a mixture oxide photocatalyst for complete of degradation in short reaction times. ZnTiO₃-TiO₂ catalysts were prepared using different zinc sources (Zinc chloride, Zinc acetate) and different titanium sources (Titanium (IV) isopropoxide, titanium (IV) n-butoxide, titanium tetrachloride) by the sol-gel method. The highest activity has been obtained with ZnTiO₃-TiO₂ catalyst, which was prepared from zinc acetate and titanium tetrachloride. In order to enhance the photocatalytic activity of this catalyst, some surfactants (SDS, HTAB, CTAB) and metal oxides (CuO, Fe₂O₃, Co₃O₄) doped ZnTiO₃-TiO₂ catalysts were prepared. The catalysts were performed to evaluate the photocatalytic oxidation of 4-chlorophenol as a model pollutant under appropriate reaction conditions. The optical and structural properties of catalysts were determined by XRD, BET, FTIR, SEM and DRS techniques.
Product distribution has been observed by high performance liquid chromatography (HPLC) analysis. The parameters such as light source, the amount of surfactant or metal oxide were investigated in photocatalytic degradation. The results obtained by the different catalysts were compared with the activities of the photocatalytic oxidation reactions of 4-chlorophenol. ZnTiO₃-TiO₂ mixed oxide catalyst that prepared by the addition of 7% Fe₂O₃ provided a complete decomposition at the end of 45 minutes under the natural sunlight. Among all catalysts the highest reaction rate (1.471 mg /Lmin) was obtained on 7% Fe₂O₃ added ZnTiO₃-TiO₂ catalyst.

GÜRDAL Savaş

Tez Adı : İran Ağır Petrol Asfalteninin Hidrokraking Reaksiyonlarınınİncelenmesi

Danışman : Prof. Dr. Muzaffer YAŞAR

Anabilim Dalı : Kimya Mühendisliği

Programı : Proses ve Reaktör Tasarımı

Mezuniyet Yılı : 2013

Tez Savunma Jürisi : Prof. Dr. Muzaffer Yaşar

Prof. Dr. Mehmet Ali GÜRKAYNAK

Prof. Dr. İsmail KIRBAŞLAR

Prof. Dr. Serpil GÖKSEL

Yrd. Doç. Dr. Solmaz AKMAZ