Seminar

Engineering HDR Seminar Series 9, 2012: Photocatalytic Reduction of Carbon Dioxide into Useful Chemicals using MWCNT/TiO2 Core-Shell Nanocomposites under Visible Light Irradiation

Ms Gui Meei Mei, CSPE postgraduate student


Date: 2012-06-08
Time: 10:30 to 11:30
Venue: Engineering meeting room 1, 5-4-22


Abstract

Increasing levels of carbon dioxide (CO2) in the atmosphere is the primary cause of global warming. Many efforts have been done to reduce CO2 emissions. Recycle and utilization of CO2 for production of useful chemicals has been one of the effective alternatives to reduce the emission of CO2 into atmosphere. Conventional approach for the conversion of CO2involving thermochemical reaction that requires high energy supply in order to break the strong C-O bonding of CO2molecule and thus, causing high energy intensive and relatively higher cost of the reaction process. In order to overcome this problem, more research has been extended to photocatalytic reduction of CO2 in which, this approach bears the unique advantages of utilizing solar power as energy supply. Photocatalytic CO2 reduction by using sunlight that resembles natural photosynthesis is a direct method to both decrease greenhouse gas and supply sustainable energy. Visible light driven photocatalytic reaction is highly desired in order to fully harvest solar energy. Furthermore, photocatalytic reduction of CO2 into fuels by using natural sunlight is promising to sustainably produce energy. However, the production of CO2 free fuel by direct conversion of solar energy into chemical energy is still a challenge for researchers. Due to relative lower energy content of the visible light as compared to UV light source, an effective photocatalysts that is active in visible light region and reactive to be photo excited at low energy level is highly desired. TiO2, that is highly active for almost all photocatalytic processes, however, has poor performance in visible light irradiated photoreaction due to the fact that it can only be activated under UV range. On the other hand, carbon nanotubes (CNTs) are excellent electrical conductors that show great light absorption ability and can stimulate the photocatalytic activity of TiO2 by the electron charge transfer through the heterojunction of the CNTs-TiO2 surfaces. This research work aims to develop highly reactive MWCNT/TiO2 core-shell nanocomposites for the conversion of CO2 into useful chemicals via photo reduction under visible light irradiation in a gas phase reaction system. 

About the Speaker

Ms Gui Meei Mei graduated with Bachelor of Chemical Engineering (honours) and Master of Science (Chemical Engineering) from Universiti Sains Malaysia. She joined Monash University Sunway Campus in 2011 for postgraduate studies. Her research focuses on photocatalytic reduction of carbon dioxide utilizing MWCNT/TiO2 core-shell nanocomposites. The study aims to develop an effective approach for conversion of carbon dioxide into useful chemicals, which is one of the alternative solutions for carbon dioxide capture and sequestration.