Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 23, Pages 12548-12553Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am403842b
Keywords
optofluidic microreactor; TiO2-coated fiberglass; photocatalytic reaction; mass transport; degradation efficiency
Funding
- Chongqing Natural Science Foundation for Outstanding Young Scholars [CSTC2012JJJQ90003]
- Natural Science Funds for Distinguished Young Scholar of Chongqing [51222603]
- National Natural Science Foundation of China [51106188, 51276208]
- Natural Science Foundation of Chongqing, China [CSTC2011BB4071]
- Fundamental Research Funds for the Central Universities [CDJZR12148801, CDJZR12140028]
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Optofluidic microreactors are promising prospects for photocatalytic reactions. However, because the flow type in conventional designs is typically laminar, the mass transport mainly relies on diffusion, and thus the rate of mass transport is limited. Accordingly, poor mass transport reduces the photocatalytic reaction rate. To alleviate the limitation of mass transport, in this work, we proposed a novel optofluidic microreactor with TiO2-coated fiberglasses immersed in the microreaction chamber. Such a design enables enhanced mass transport by shortening the transport length and inducing the perturbation to liquid flow so as to improve the performance. We demonstrated the feasibility of the optofluidic microreactor with the TiO2-coated fiberglass by the photocatalytic water treatment of methylene blue under UV irradiation. Results showed that the proposed optofluidic microreactor yielded much higher degradation efficiency than did the conventional optofluidic microreactor as a result of enhanced mass transport. The microreactor with the TiO2-coated fiberglass showed a 2-3-fold improvement in the reaction rate constant as opposed to conventional ones. The maximal increment of the degradation efficiency can reach more than 40%.
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