HYBRID EVENT: You can participate in person at Paris, France or Virtually from your home or work.

4th Edition of

Chemistry World Conference

June 17-19, 2024 | Paris, France

Chemistry 2024

Tesfay Welderfael

Speaker at Chemistry World Conference 2024 - Tesfay Welderfael
Aksum University, Ethiopia
Title : Effects of doping aluminum and poly(vinyl alcohol) in nanosize ZnO on photocatalytic degradation of methyl orange under sunlight


Nanosize ZnO, Al-modified ZnO, ZnO/PVA, and Al-modified ZnO/PVA were synthesized using coprecipitation, and hydrothermal methods. As-synthesized nanomaterials were characterized by employing XRD, UV-visible spectroscopy, FTIR, and SEM techniques. The photocatalytic activities of prepared nanoparticles were determined by evaluating   degradation of   methyl orange (MO) dye in aqueous medium under sunlight.  The doping Al in ZnO, and compositing the later with polyvinyl alcohol (PVA), both these processes improved the photocatalytic activity of ZnO under visible radiation owing to narrowing  of semiconductor band gap, and the minimized recombination of charge carriers.  The extent of MO degradation under visible light using different synthesized nanostructures were in the order: (Al-doped ZnO/PVA) > (Al-modified ZnO) > (ZnO/PVA) > (pure ZnO). The results show that Al doping, and compositing PVA with ZnO, both these processes cumulatively enhance the photocatalytic activity due to minimizing charge carriers’ recombination at the semiconductor. Using Al-modified ZnO/PVA as photocatalyst, maximum degradation (83.7 %) of MO could be achieved at 90 minutes.