Intensification of photocatalytic pollutant abatement in microchannel reactor using TiO2 and TiO2‐graphene |
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| Authors: | Natan Padoin Luísa Andrade Joana Ângelo Adélio Mendes Regina de Fátima Peralta Muniz Moreira Cíntia Soares |
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| Affiliation: | 1. LEMA – Dept. de Engenharia Química e Engenharia de Alimentos, Universidade Federal de Santa Catarina, Campus Universitário Reitor Jo?o David Ferreira Lima, Florianópolis‐SC, Brasil;2. LEPABE ‐ Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, Porto, Portugal |
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| Abstract: | A microfluidic device was applied to the photocatalytic degradation of methylene blue as a model pollutant. Titanium dioxide nanoparticles (TiO2–P25) and a synthesized composite TiO2‐graphene catalyst were immobilized on the inner walls of a borosilicate glass microfluidic chip. The deposition evolution of the nanoparticles was evaluated by monitoring the optical profile of the system. It was found that a higher initial reaction rate was obtained in the microreactor containing composite catalyst (TiO2‐GR) on the inner walls, but both systems (TiO2 and TiO2‐GR) achieved similar reaction rates when the steady‐state was reached. Decolorization rate of methylene blue in our microfluidic chips was found to be approximately one order of magnitude higher than equivalent macroscopic systems reported in the literature at similar experimental conditions. Additionally, computational simulations were performed to investigate the physics involved in these processes. The model was experimentally validated for further scale‐out studies. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2794–2802, 2016 |
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| Keywords: | microfluidics photocatalysis methylene blue titanium dioxide graphene computational modeling |
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