Date of Award
Master of Science (MS)
Ahmed H. Alzamly
Haythem Ali Mohammad Saadeh
The present thesis focuses on the design and synthesis of novel visible light photocatalysts for CO₂ utilization. In recent years, Bi-based materials have shown remarkable photocatalytic activity in the field of CO₂ reduction. Particularly, BiNbO4 has many promising applications as a visible light-harvesting material due to its bandgap position and orbital hybridization. In this study, an intensive effort has been made to study the effect of different reaction parameters such as temperature and pH of the different synthetic methodologies applied. The new photocatalytic materials have been characterized using different characterization techniques including PXRD, BET, SEM, EDX, and UV-Vis DRS. Since the activity of BiNbO₄ is limited due to the high recombination rate of the photogenerated electron-hole pairs and the low surface area, to minimize this effect, reduced graphene oxide modified BiNbO₄ composite material was fabricated using simple mechanical mixing. Moreover, Ti-based amine-functionalized metal-organic frameworks (MOFѕ) modified BiNbO₂ hybrid material was also prepared. The activity of prepared BiNbO₄/r-GO heterojunction photocatalysts was examined for the cycloaddition of CO₂ with propylene oxide as a photocatalytic model reaction. Interestingly, no polymeric material was formed and selective cyclic propylene carbonate in high yield was obtained, with the highest yield obtained when using 5% r-GO by mass. Furthermore, the activity of BiNbO₄/NH₂-MIL-125(Ti) was found to increase upon the addition of 50% NH₂-MIL-125(Ti) by mass.
Bakiro, Maram Yahya, "Synthesis, Characterization, Electronic Structure of Reduced Graphene Oxide and NH₂-MIL-125(Ti) Modified BiNbO₄ and Their Photocatalytic Activities" (2020). Chemistry Theses. 10.