Design and optimisation of a low-cost titanium dioxide-coated stainless steel mesh photocatalytic water treatment reactor

Grao, Matthieu; Ratova, Marina; Kelly, Peter

doi:10.1016/j.jclepro.2021.126641

Cited by 21 publications

(8 citation statements)

References 30 publications

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“…The design of the LCPR-II is based on the LCPR-I developed at the Manchester Metropolitan University earlier [55]. Likewise, the bespoke reactor utilises an external light source and does not involve any costly components (quartz, membranes, air injector etc.…”

Section: Photocatalytic Reactormentioning

confidence: 99%

“…The reactor was placed in an aluminium enclosure with a UV-A irradiation source. The pump was operated at minimum capacity, to minimise power consumption, without limiting mass transfer, resulting in a flowrate of 5.14 L.min -1 [55]. Increasing the number of coated glass rods increases the catalyst load, and by extension the reaction rate, up to a certain point where light would be blocked, and performances would stop increasing.…”

Section: Photocatalytic Reactormentioning

confidence: 99%

“…and relied almost exclusively on components available in the consumer computer market. The design of the present reactor is based on the LCPR-I (Low-cost photocatalytic reactor) [55]. The photocatalytic activity of the reactor was initially evaluated by assessing its ability to degrade methylene blue (MB) under UV-A with a varying number of coated rods.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of contaminants of emerging concern using a low-cost and efficient black bismuth titanate-based water treatment reactor

Grao¹,

Redfern²,

Kelly³

et al. 2022

Journal of Water Process Engineering

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Section: Photocatalytic Reactormentioning

confidence: 99%

Section: Photocatalytic Reactormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of contaminants of emerging concern using a low-cost and efficient black bismuth titanate-based water treatment reactor

Grao¹,

Redfern²,

Kelly³

et al. 2022

Journal of Water Process Engineering

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“…1a). The light and fluid in the optofluidic microreactor are characterized by a short molecular diffusion path, an intrinsically large surface-to-volume ratio, uniform illumination, and efficient light harvesting [21][22][23][24][25] . The light-harvesting can be further improved using nanostructures of photocatalysts that scatter light, or by modifying the base substrates to increase the optical path and thereby increase the number of electron-hole pairs that are generated due to multiple interactions with the photocatalyst 26,27 .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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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“…Many prior studies rely on the modification of only one or two discrete variables such as template grain size 4,5 or concentration of functionalized particles embedded in the surface of the foam 16 . In this work, we employed a pared down Design of Experiments 17–19 (DOE) approach to gather experimental data and conduct factor screening 20 . This approach incorporates scientific knowledge, including relevant parameter ranges and potential interactions between input variables, into the experimental design to reduce extraneous experimentation 21 .…”

Section: Introductionmentioning

confidence: 99%

Towards tunable polymer foam fabrication: A case study to advance green materials development in limited data scenarios

et al. 2022

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Early phases of green material development can be accelerated by identifying driving factors that control material properties to understand potential tradeoffs. Full investigation of fabrication variables is often prohibitively expensive. We propose a pared-down design of experiments (DOE) approach to identify driving variables in limited data scenarios using tunable polydimethylsiloxane (PDMS) foams made via sacrificial templating as an example system. This new approach systematically determines the dependencies of porosity, transparency, and fluid flow by varying the template particle size and packing while using a more sustainable solvent. Factor screening identified template particle size and packing density as the driving factors for foam performance by controlling pore size and interconnectivity. The framework developed provides a robust, foundational understanding of how to green and tune a novel material's properties using an efficient and effective exploration of the design space. Recommendations for applying this method to a broad suite of experiments are provided.

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Design and optimisation of a low-cost titanium dioxide-coated stainless steel mesh photocatalytic water treatment reactor

Cited by 21 publications

References 30 publications

Photocatalytic degradation of contaminants of emerging concern using a low-cost and efficient black bismuth titanate-based water treatment reactor

Photocatalytic degradation of contaminants of emerging concern using a low-cost and efficient black bismuth titanate-based water treatment reactor

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

Towards tunable polymer foam fabrication: A case study to advance green materials development in limited data scenarios

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