Magnetic Field-Enhancing Photocatalytic Reaction in Micro Optofluidic Chip Reactor

• Published in: Nanoscale research letters Vol. 14; no. 1; pp. 1 - 7
• Main Authors: Huang, Hung Ji, Wang, Yen Han, Chau, Yuan-Fong Chou, Chiang, Hai-Pang, Wu, Jeffrey Chi-Sheng
• Format: Journal Article
• Language: English
• Published: New York Springer US 15.10.2019; Springer Nature B.V; SpringerOpen
• Subjects: Chemistry and Materials Science; Dissolved oxygen; Dyes; Ethanol; Glass substrates; Green chemistry; Hot charge carriers; Hydroxyl ions; Ion condensation; Magnetic field; Magnetic fields; Magnets; Materials Science; Micro optofluidic chip; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Organic chemistry; Photocatalysis; Photocatalytic reactions; Photodegradation; Reactors; Titanium dioxide; Ion condensation; Photocatalytic reactions; Magnetic field; Titanium dioxide; Hot charge carriers; Micro optofluidic chip
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-019-3153-1

A small external magnetic field (100–1000 Oe) was demonstrated to enhance the photocatalytic degradation of methyl orange (MO) using TiO 2 NPs in micro optofluidic chip (MOFC) reactors. The rectangular shape of the fluidic channel and TiO 2 deposited only onto the lower glass substrate leads to a selectively enhancing photocatalytic reactions by magnetic field in specific directions. Utilizing ethyl alcohol as a scavenger presented the difference between generated hot-hole (hVB + ) and hot-electron (eCB − ) pathways of photocatalytic reactions. Effects of dissolved oxygen (DO) and hydroxyl ions (OH − ) are all demonstrated in a magnetic field-enhancing photocatalytic reaction. The experimental results demonstrate great potential for practical applications utilizing low-price fixed magnets in the field of green chemistry.