Document Details

Document Type : Thesis 
Document Title :
SYNTHESIS OF GRAPHENE SUPPORTED ZNO–RARE EARTH METAL OXIDE TERNARY NANOCOMPOSITES FOR ENHANCED PHOTOCATALYTIC APPLICATIONS
تحضير مركبات متناهية الصغر من الجرافين المدعم على أكسيد الخارصين و أكاسيد الفلزات الارضيه النادره لتحسين تطبيقات الحفز الضوئي
 
Subject : Faculty of Sciences 
Document Language : Arabic 
Abstract : Nanocrystalline zinc oxide decorated with different molar ratio graphene nanoplatelets (1, 2 and 4%) and rare earth metal oxides with different molar ratio (0.1, 0.5, 1, 2 and 4%) photocatalysts were successfully prepared via microwave irradiation technique to enhance the photocatalytic activity of the ZnO in crystal violet, methylene blue, methyl orange and 4-nitro phenol dyes solution under visible and UV light irradiation degradation. The prepared photocatalysts were calcined at 300 °C) and characterized using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Diffuse reflectance UV-Vis spectroscopy (DR-UV-Vis), Fourier transform infra-red spectroscopy (FT-IR) and Surface area measurements (BET). The calcined catalysts were tested for the decolorization of different types of organic dyes. The characterization results confirmed the presence of only pure ZnO phase with particle size ranged between 29 to 35 nm as well as effective interactions between graphene and zinc oxide. The nature of microporosity and mesoporosity were due to the needle like structure morphology for the prepared photocatalyst. Doping of graphene nanoplatelets and samarium or ytterbium led to an improve in the degradation efficiency as well as the photogenerated electron–hole pair separation rate as shown by the UV–vis diffuse reflectance spectroscopy measurements, with band gap ranged between 3.04 and 3.14 eV. Ytterbium oxide doped zinc oxide and samarium oxide doped zinc oxide photocatalysts exhibited higher decolonization efficiency compared with the pure zinc oxide and graphene doped zinc oxide samples (90% of degradation) in a short reaction time (60-120 min) under both ultraviolet and visible light irradiation. Effect of the doping of rare earth ions on the physicochemical and photocatalytic activity of the prepared catalysts have been conducted to explore the new class of photocatalyst materials with potential uses in the remediation of polluted water. 
Supervisor : Dr. Tarek Taha Ahmed Ali 
Thesis Type : Master Thesis 
Publishing Year : 1439 AH
2018 AD 
Co-Supervisor : Prof. Aisha M. Turkustani 
Added Date : Sunday, June 3, 2018 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
صفاء محمد نصيفNaseef, Safaa MohammedResearcherMaster 

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