Recent advances in heterogeneous micro-photoreactors for wastewater treatment application

Shukla, K. K.; Agarwalla, Sushama; Duraiswamy, Suhanya; Gupta, Raju Kumar

doi:10.1016/j.ces.2021.116511

Cited by 34 publications

(11 citation statements)

References 146 publications

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“…From this aspect, the vortex catalytic reactor has an added advantage, as the movement of the inner wall of the photoreactor can generate counter rotating vortex flows to cause sufficient turbulence to the wastewater in contact with the photocatalyst loaded inner wall (Figure A) . Alternatively, microphotoreactors with small channels can also resolve the limitations of mass transfer and nonuniform distribution of light inside the reactor . Within these configurations the reaction kinetics become faster compared to those within conventional reactors.…”

Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

“…115 Alternatively, microphotoreactors with small channels can also resolve the limitations of mass transfer and nonuniform distribution of light inside the reactor. 116 Within these configurations the reaction kinetics become faster compared to those within conventional reactors. However, the low throughput within these reactors is another major disadvantage for their commercialization.…”

Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

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Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

2022

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Poly-and perfluoroalkyls (PFAs) are now designated as serious threats to the environment. More than 4700 PFAs, along with their precursors, show a high degree of persistence and long-range spreading in soils and waters causing recalcitrant bioaccumulation in plants, fish, birds, and mammals causing health hazards all along the food chain. Visible-light induced degradation of PFA in pure water using photocatalysts, a potentially sustainable advanced oxidation process, showed exciting results in laboratories for both complete and partial mineralization of these toxins. However, none of the methods and materials have been considered so far for upscaling toward practical applications due to several hard-to-resolve challenges. This Review provides a critical analysis of the recent advancements in photocatalytic remediation of aqueous PFA under visible light irradiation and addresses possible future directions to valorize some of the prospective methods and materials to practical applications.

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Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

2022

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“…38−40 As a result, it is an urgent task for researchers to find a low-cost method for the microreactor preparation and make it applicable to most photocatalysts. 41,42 Herein, we developed a facile and inexpensive method to prepare a photocatalytic microreactor quickly. Unlike traditional preparation routes that grow photocatalysts in situ in expensive microreactors, this work provides a simple assembling method to fit most photocatalysts.…”

Section: ■ Introductionmentioning

confidence: 99%

Optimization and Parameter Investigation of the Planar Photocatalytic Microreactor

Chen,

Wang,

Dong

et al. 2024

Langmuir

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The microreactor could break the limitation of mass transfer and photon transmission in photocatalysis. Through a facile assembly method, a planar photocatalytic microreactor was constructed to fit most of the photocatalysts regardless of their strict preparation method. This microreactor exhibits a 2.41-fold efficiency compared to a bulk reactor. Parameters that affect the photocatalytic performance were discussed in detail by experiment and calculation. The diffusion rate is the main bottleneck in a planar microreactor under a laminar flow. The microreactor with lower height shows higher efficiency owing to faster mass transfer, while the length and width affect slightly. Elevating the light power density provides a diminishing benefit. Faster flow speed reduces the apparent degradation percent but increases the chemical reaction rate, in fact. The reaction rate increases to 9.31 times by reducing the height from 500 to 100 μm and grows another 1.76 times by adding the flow speed from 10 to 40 mL/h. This work illustrates the influence of parameters on planar photocatalytic microreactors and offers a promising prospect for large-volume photocatalytic water treatment.

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“…In recent years, the miniaturization of equipment has become an important direction in the fields of process intensification and flow chemistry. Due to their characteristics of a short transmission distance and large specific surface area, brought about by microscale effects, miniaturized photocatalytic reactors can greatly improve the photon transmission efficiency and reaction mass transfer rate, rapidly shorten the reaction time and achieve a significant improvement in photocatalytic efficiency. − For example, Jang et al used a capillary microreactor to realize the rapid and high-yield photocatalytic synthesis of 2 H -indazole. The yield of the drug scaffold reached more than 65% within 1 min, while it took more than 18 h to reach the same yield using a flask .…”

Section: Introductionmentioning

confidence: 99%

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

Wang

Jin

Jia

et al. 2023

Ind. Eng. Chem. Res.

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The combination of a photocatalytic reaction and microfluidic technology is an increasingly popular method utilized to continuously degrade wastewater. In this work, a novel photocatalytic microreactor with TiO 2 loaded on the channel center insert was designed and the photocatalytic degradation process of oxytetracycline (OTC) was investigated. Parameters such as TiO 2 loading, OTC initial concentration, light intensity, and ion (NO 3 − and SO 4 2−) concentrations were systematically investigated. The results show that the degradation efficiency of OTC was 56% under the optimal experimental conditions. Compared with the conventional miniaturized photocatalytic reactors, the reaction rate constant and space−time degradation efficiency of the plug-in three-dimensional photocatalytic microreactor proposed in this work were 1−2 orders of magnitude higher. In addition, dimensionless correlation was obtained to predict the degradation efficiency. This work provides a promising microfluidic technology for the process intensification of photocatalytic reaction and wastewater treatment.

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Recent advances in heterogeneous micro-photoreactors for wastewater treatment application

Cited by 34 publications

References 146 publications

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

Optimization and Parameter Investigation of the Planar Photocatalytic Microreactor

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

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