Effects of External Magnetic Field in Photocatalytic Reactions in Microfluidic Chip Reactors

Hung Ji Huang^1*, Yen Han Wang², Yuan-Fong Chou Chau³, Hai-Pang Chiang^4,5, Jeffrey Chi-Sheng Wu²

¹Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu, Taiwan
²Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
³Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Brunei
⁴Institute of Physics, Academia Sinica, Taiwan
⁵Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan

* Presenter:Hung Ji Huang, email:hjhuang@narlabs.org.tw

The external magnetic field are applied to enhance the photocatalytic degradation of methyl orange in the micro optical fluidic chip reactors. The ions (OH-) and light induced hot charge carriers are forced to move by magnetic field. Small magnetic field of several hundred oe presented affective enhancement on photocatalytic processing efficiency. The high mass transfer rate and low hot charges recombination result in enhanced processing efficiency. Addition of scavenger, ethanol alcohol, eliminates the induced hot holes in titanium dioxide nanoparticles under 254 nm light illumination. The effects of magnet field on difference between the hot hole and hot electron reaction path are presented in the experimental results.

Keywords: photocatalytic reaction, micro optical fluidic chip reactor, magnetic field, titanium dioxide