Document Details

Document Type : Thesis 
Document Title :
GREEN SYNTHESIS OF NOBLE METAL NANOPARTICLES AND THEIR CATALYTIC ACTIVITIES
التوليف الأخضر للفلزات النبيلة النانونية ونشاطها الحفزي
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : Silver-iron bimetallic nanoparticles were synthesized by using AgNO3 and Fe(NO3)3 as an Ag/Fe source in presence of Palm dates fruit extract. Upon addition of extract to a solution of Ag+ and Fe3+, a prefect transparent stable dark brown color appears within a few minutes at room temperature. In order to confirm the nature of resulting color and morphology of core-shell Ag@Fe, UV–visible spectroscopy, transmission electron microscopy, Fourier-transform infrared spectroscope and energy dispersive X-ray spectroscopy techniques were used. The absence of surface plasmon resonance peaks in the entire UV–visible region suggests the formation of silver-iron core-shell nanoparticles. The main constituent of the palm extract, glucose, acts as a reducing and capping agent. The apparent pseudo-first order rate constants were found to be increased and decreased, respectively, with increasing [Ag@Fe] and [NaBH4] for the degradation of methyl red but remain constant at higher [NaBH4]. The equilibrium adsorption data were fitted to Langmuir, Freundlich and Temkin isotherms. The maximum adsorption capacity from Langmuir isotherm were determined to be 125 mg/g for the physio-sorption adsorption of methyl red onto the surface of Ag@Fe. The pseudo-first-rate constant was calculated (7.5 ×10-3 s-1) for the UV-light assisted degradation of methyl red. Similarly, the obtained nanoparticles were used as a catalyst for the degradation of bromothymol blue in absence and presence of sunlight. The degradation kinetics was studied and the apparent pseudo-first order rate constants were determined with respect to Ag@Fe in presence of H2O2. 
Supervisor : Prof. Elham Shafik Aazam 
Thesis Type : Master Thesis 
Publishing Year : 1440 AH
2019 AD 
Co-Supervisor : Dr. Zoya Zaheer 
Added Date : Sunday, March 31, 2019 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عائشة جلال الأصفرAl-Asfar, Aisha JalalResearcherMaster 

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