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  Hierarchical optofluidic microreactor for water purification using an array of TiO2 nanostructures

Kim, H., Kwon, H., Song, R., Shin, S., Ham, S.-Y., Park, H.-D., et al. (2022). Hierarchical optofluidic microreactor for water purification using an array of TiO2 nanostructures. npj Clean Water, 5: 62, pp. 1-10. doi:10.1038/s41545-022-00204-y.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000D-AFA2-7 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-49BB-E
Genre: Journal Article

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 Creators:
Kim, Hyejeong, Author           
Kwon, Hyunah, Author
Song, Ryungeun, Author
Shin, Seonghun, Author
Ham, So-Young, Author
Park, Hee-Deung, Author
Lee, Jinkee, Author
Fischer, Peer1, Author                 
Bodenschatz, Eberhard, Author                 
Affiliations:
1Max Planck Research Group Micro, Nano, and Molecular Systems, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497666              

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 Abstract: Clean water for human consumption is, in many places, a scarce resource, and efficient schemes to purify water are in great demand. Here, we describe a method to dramatically increase the efficiency of a photocatalytic water purification microreactor. Our hierarchical optofluidic microreactor combines the advantages of a nanostructured photocatalyst with light harvesting by base substrates, together with a herringbone micromixer for the enhanced transport of reactants. The herringbone micromixer further improves the reaction efficiency of the nanostructured photocatalyst by generating counter-rotating vortices along the flow direction. In addition, the use of metal-based substrates underneath the nanostructured catalyst increases the purification capacity by improving the light-harvesting efficiency. The photocatalyst is grown from TiO2 as a nanohelix film, which exhibits a large surface-to-volume ratio and a reactive microstructure. We show that the hierarchical structuring with micro- to nanoscale features results in a device with markedly increased photocatalytic activity as compared with a solid unstructured catalyst surface. This is evidenced by the successful degradation of persistent aqueous contaminants, sulfamethoxazole, and polystyrene microplastics. The design can potentially be implemented with solar photocatalysts in flow-through water purification systems.

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Language(s): eng - English
 Dates: 2022-06-162022-10-202022-11-10
 Publication Status: Published online
 Pages: 10
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41545-022-00204-y
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Title: npj Clean Water
  Other : Clean Water
Source Genre: Journal
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Publ. Info: Basingstoke : Macmillan Publishers Limited
Pages: 10 Volume / Issue: 5 Sequence Number: 62 Start / End Page: 1 - 10 Identifier: ISSN: 2059-7037
CoNE: https://pure.mpg.de/cone/journals/resource/2059-7037