Advanced Water Management Centre

AWMC Seminar Program: Efficient photocatalytic destruction of carbamazepine using graphitic carbon nitride under simulated sunlight irradiation

Title: Efficient photocatalytic destruction of carbamazepine using graphitic carbon nitride under simulated sunlight irradiation
Presenter: Jiexi Zhong

Abstract: Ubiquitous occurrence of micropollutants in water environment has caused increasing concerns for public health and ecological security. Although biological treatment processes are economically feasible, conventional systems are not technologically feasible to destruct micropollutants present in wastewater. This study developed a photocatalytic process to destruct micropollutants under solar irradiation, but without using expensive metal catalysts. We synthesized urea-based graphitic carbon nitride (g-C3N4) by a facile one-step pyrolysis method, and evaluated photocatalytic efficiency of recalcitrant carbamazepine (CBZ) in aqueous solution. Under simulated solar irradiation, g-C3N4 could achieve 100% removal efficiency of 0.1 mg/L CBZ under of wastewater effluent matrix within 15 min. In addition, 86.5% CBZ removal efficiency was observed in wastewater influent after 20 min irradiation. The pH, light intensity and initial CBZ concentration were found to have significant impacts on the removal efficiency of CBZ. The porous structure of g-C3N4 promoted effective charge separation and mass transportation of CBZ near the photocatalyst surface, thus enabling a high kinetic rate (0.5624 min-1). In terms of reactive oxygen species (ROS) scavenger tests, superoxide radicals (O2•-) and electron hole (h+) were identified as the major radicals of CBZ destruction. Nine cycles of recyclability test suggested the catalyst could withstand multiple reactions. The facile synthesis, superior efficiency, versatile merit of g-C3N4 makes it promising for the application in tertiary wastewater treatment processes.

AWMC hosts a free seminar every Friday from 9am.

Event Details
Date & Time: 
Friday, 02 August 2019
9:30am
Venue: 76-228 Molecular science Building

Event Contact: awmcseminars@awmc.uq.edu.au