Enzymatic monolithic reactors for micropollutants degradation

Ahmad, Sher; Sebai, Wassim; Belleville, Marie‐Pierre; Brun, Nicolas; Galarneau, Anne; Sánchez-Marcano, José

doi:10.1016/j.cattod.2020.04.048

Cited by 15 publications

(18 citation statements)

References 50 publications

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“…Then, the concentration polarization coefficient (CPC) at the feed as well as osmotic solution side is calculated from Eqs. (19) and (20) [36]: (15…”

Section: Concentration Polarizationmentioning

confidence: 99%

“…The temperature polarization would also contribute to the reduction of driving force which ultimately reduces the transmembrane flux. The decline in the driving force due to temperature polarization can be estimated by the (20…”

Section: Temperature Polarizationmentioning

confidence: 99%

“…Different approaches are used to model the OMD process, however, the resistance-in-series (RIS) model approach is a widely applied and acceptable technique to predict water transport flux through the membrane [18][19][20][21]. Most of the models used in literature based on the RIS model have not considered temperature/concentration polarization effects.…”

Section: Introductionmentioning

confidence: 99%

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Development of mass and heat transfer coupled model of hollow fiber membrane for salt recovery from brine via osmotic membrane distillation

et al. 2021

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Background In this research work, a coupled heat and mass transfer model was developed for salt recovery from concentrated brine water through an osmotic membrane distillation (OMD) process in a hollow fiber membrane contactor (HFMC).The model was built based on the resistance-in-series concept for water transport across the hydrophobic membrane. The model was adopted to incorporate the effects of polarization layers such as temperature and concentration polarization, as well as viscosity changes during concentration. Results The modeling equations were numerically simulated in MATLAB® and were successfully validated with experimental data from literature with a deviation within the range of 1–5%. The model was then applied to study the effects of key process parameters like feed concentrations, osmotic solution concentration, feed, and osmotic solution flow rates and feed temperature on the overall heat and mass transfer coefficient as well as on water transport flux to improve the process efficiency. The mass balance modeling was applied to calculate the membrane area based on the simulated mass transfer coefficient. Finally, a scale-up for the MD process for salt recovery on an industrial scale was proposed. Conclusions This study highlights the effect of key parameters for salt recovery from wastewater using the membrane distillation process. Further, the applicability of the OMD process for salt recovery on large scale was investigated. Sensitivity analysis was performed to identify the key parameters. From the results of this study, it is concluded that the OMD process can be promising in salt recovery from wastewater.

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“…Then, the concentration polarization coefficient (CPC) at the feed as well as osmotic solution side is calculated from Eqs. (19) and (20) [36]: (15…”

Section: Concentration Polarizationmentioning

confidence: 99%

Section: Temperature Polarizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of mass and heat transfer coupled model of hollow fiber membrane for salt recovery from brine via osmotic membrane distillation

et al. 2021

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“…Only recently, Ahmad et al . have used laccase immobilized on silica monoliths for degradation of micropollutants in water 14,15 . Increased activity of the immobilized enzyme and high operational and storage stability were achieved.…”

Section: Introductionmentioning

confidence: 99%

Monolithic flow reactor for enzymatic oxidations

Zverina

Pinelo

Woodley

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Oxidation is among the most important reactions in organic chemistry. Enzymatic oxidation offers a greener alternative to a conventional chemo‐catalytic approach and opens the potential for new reactions. However, inefficient use of expensive enzymes and oxygen (O2) limitations represent particular challenges for biocatalytic reactor design. This work reports a new tubular reactor for continuous flow enzymatic oxidations. RESULTS The reactor comprises a thiol‐functional porous monolith (0.93 ± 0.16 m2 g−1) and an O2‐permeable wall (115 600 ± 1500 mL m−2 day−1). The monolith retains enzyme inside the reactor leading to efficient use. The wall acts as a membrane contactor providing transport of O2 from atmospheric air to the immediate proximity of the enzyme inside the reactor, without any pressure and sparging required. The reactor performance was demonstrated using oxidation of glucose by glucose oxidase (EC 1.1.3.4) coupled with in situ consumption of hydrogen peroxide by horseradish peroxidase (EC 1.11.1.7). At a constant flow rate of 0.1 mL min−1, the product concentration reached 0.10 mmol L−1 after 1.5 h and continued to be relatively high for the next ≥10 h. Overall, the reactor remained active for >40 h using only 15 μg glucose oxidase. Furthermore, the reactor could be rejuvenated by periodic injection of fresh enzyme and thus can operate continuously for extended periods. CONCLUSION We have shown here an alternative approach to efficient enzyme use and O2 delivery. Moreover, with its flexible design, the reactor can be optimized to accommodate a range of gas‐dependent biocatalytic transformations. © 2021 Society of Chemical Industry (SCI).

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“…Owing to the extensively studied surface chemistry and versatility in synthesis steps, HSM supports can be functionalized via in situ as well as post-synthesis treatment with a variety of moieties and applied in numerous catalytic applications. Recent studies show successful implementation of silica monolithic catalysts as flow reactors in various chemical and biochemical transformations (El Kadib et al, 2009;Sachse et al, 2010;Linares et al, 2012;Sachse et al, 2012;Sachse et al, 2013;Szymańska et al, 2013;Hakat et al, 2016;Ciemięga et al, 2017;Haas et al, 2017;Liguori et al, 2017;Pélisson et al, 2017;Mrowiec-Białoń et al, 2018;Russell et al, 2020;Yamada et al, 2020;Ahmad et al, 2021;Turke et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer in Hierarchical Silica Monoliths Loaded With Pt in the Continuous-Flow Liquid-Phase Hydrogenation of p-Nitrophenol

et al. 2021

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Sol-gel-based silica monoliths with hierarchical mesopores/macropores are promising catalyst support and flow reactors. Here, we report the successful preparation of cylindrically shaped Pt-loaded silica monoliths (length: 2 cm, diameter: 0.5 cm) with a variable mean macropore width of 1, 6, 10, or 27 μm at a fixed mean mesopore width of 17 nm. The Pt-loaded monolithic catalysts were housed in a robust cladding made of borosilicate glass for use as a flow reactor. The monolithic reactors exhibit a permeability as high as 2 μm2 with a pressure drop below 9 bars over a flow rate range of 2–20 cm3 min−1 (solvent: water). The aqueous-phase hydrogenation of p-nitrophenol to p-aminophenol with NaBH4 as a reducing agent was used as a test reaction to study the influence of mass transfer on catalytic activity in continuous flow. No influence of flow rate on conversion at a fixed contact time of 2.6 s was observed for monolithic catalysts with mean macropore widths of 1, 10, or 27 µm. As opposed to earlier studies conducted at much lower flow velocities, this strongly indicates the absence of external mass-transfer limitations or stagnant layer formation in the macropores of the monolithic catalysts.

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Enzymatic monolithic reactors for micropollutants degradation

Cited by 15 publications

References 50 publications

Development of mass and heat transfer coupled model of hollow fiber membrane for salt recovery from brine via osmotic membrane distillation

Development of mass and heat transfer coupled model of hollow fiber membrane for salt recovery from brine via osmotic membrane distillation

Monolithic flow reactor for enzymatic oxidations

Mass Transfer in Hierarchical Silica Monoliths Loaded With Pt in the Continuous-Flow Liquid-Phase Hydrogenation of p-Nitrophenol

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