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An aerogel-based photocatalytic microreactor driven by light guiding for degradation of toxic pollutants
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SYSNO ASEP 0549489 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title An aerogel-based photocatalytic microreactor driven by light guiding for degradation of toxic pollutants Author(s) Őzbakir, Y. (TR)
Jonáš, Alexandr (UPT-D) RID, SAI, ORCID
Kiraz, A. (TR)
Erkey, C. (TR)Number of authors 4 Article number 128108 Source Title Chemical Engineering Journal. - : Elsevier - ISSN 1385-8947
Roč. 409, 1 April (2021)Number of pages 11 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Photocatalytic microreactors ; Optofluidic waveguides ; Total internal reflection ; Nanoporous solid-air aerogels ; Silica-titania composite aerogels ; Photocatalytic degradation Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Open access Institutional support UPT-D - RVO:68081731 UT WOS 000618082100006 EID SCOPUS 85098938346 DOI 10.1016/j.cej.2020.128108 Annotation Efficient utilization of light in photocatalytic chemical processes requires careful optimization of the photocatalytic reactor layout to maximize the interaction between the incident light, photocatalyst and reactant molecules. Herein, we report a new type of photocatalytic flow microreactor with an integrated light guide, formed by a channel fabricated inside a hydrophobic composite aerogel monolith made of silica and titania (TiO2). The liquid-filled channel simultaneously acts as a reaction vessel and as a liquid-core optofluidic waveguide, distributing the incident light over the whole reaction volume. Anatase TiO2 nanoparticles embedded in the channel walls then serve as a photocatalyst that can efficiently interact with both the guided light and the reactant solution along the channel length. Composite aerogels were synthesized with TiO2 content between 1 and 50 wt %, retaining their interconnected mesoporous network, low refractive index, and waveguide propagation losses below3.9 dB/cm over this range of compositions. Using photocatalytic degradation of phenol an organic compound with harmful environmental effects as a model chemical reaction, the performance of the microreactor was systematically investigated. Reactant conversion was observed to increase with increasing incident light power, decreasing reactant flow rate and increasing mass fraction of TiO2 in the composite. An analytical model of the reactor/light guide system was developed that predicted successfully the scaling of the reactant conversion with the incident light power and reactant flow rate. The presented concept of aerogel-based optofluidic photocatalytic microreactors is readily scalable and possesses great potential for carrying out other photocatalytic reactions in both polar and non-polar solvents. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S1385894720342248?via%3Dihub
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