Catalytic membrane micro-reactor with nano ZIF-8 immobilized in membrane pores for enhanced Knoevenagel reaction of Benzaldehyde and Ethyl cyanoacetate

Qiu, Boya; Fan, Senqing; Wang, Yilin; Chen, Jiaojiao; Xiao, Zeyi; Wang, Yuyang; Chen, Yu; Liu, Jingyun; Qin, Yangmei; Jian, Shizhao

doi:10.1016/j.cej.2020.125910

Cited by 40 publications

(23 citation statements)

References 36 publications

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“…The high surface energy of NPs also promotes the immobilization of NPs on membrane walls and improve the immobilization stability of NPs. The high stability of nanoparticles in the deep‐permeation nanostructure has also been demonstrated in our previous works 17‐19 . In addition, compared with MOF powders, the reuse of the micromembrane adsorber can prevent the centrifugation process, thereby further decreasing the loss of the MOF materials.…”

Section: Resultssupporting

confidence: 60%

“…The calculation of BET surface area of the MOF powders inside the PES membrane pores is described in our previous work 17 …”

Section: Methodsmentioning

confidence: 99%

“…That means a deep‐permeation nanostructure (DPNS) should be realized in the membrane absorber. In‐situ assembly of nanoparticles in membrane pores by flowing synthesis is a feasible method for the expected DPNS 17‐19 . During the flowing synthesis, the flowing of precursor solution in the membrane pores by external forces can overcome the surface tension of the precursor solution, so that the precursor solution can be filled in each membrane pore along the whole thickness direction of the membrane 20‐22 .…”

Section: Introductionmentioning

confidence: 99%

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Micromembrane absorber with deep‐permeation nanostructure assembled by flowing synthesis

et al. 2021

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A micromembrane adsorber with deep‐permeation nanostructure (DPNS) has been successfully fabricated by flowing synthesis. The nanoparticles are in‐situ assembled in membrane pores and immobilized in each membrane pore along the direction of membrane thickness. The nanoparticles with a lower size and thinner size distribution can be achieved owing to the confined space effect of the membrane pores. As a concept‐of‐proof, the nano ZIF‐8 and ZIF‐67 are fabricated in porous membrane pores for methyl orange (MO) and rhodamine B (RhB) adsorption. The adsorption rate is increased significantly owing to the enhanced contact and mass transfer in the confined space. The adsorption capacity for the RhB is also increased, since the size of the nanoparticles assembled in membrane pores is smaller with more active sites exposed. This micromembrane adsorber with DPNS has good reusability and can provide a promising prospect for industrial application.

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Section: Resultssupporting

confidence: 60%

“…The calculation of BET surface area of the MOF powders inside the PES membrane pores is described in our previous work 17 …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromembrane absorber with deep‐permeation nanostructure assembled by flowing synthesis

et al. 2021

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“…It can be deduced that the adsorption rate constant can be increased about three times for CR adsorption and five times for MB adsorption, after the HP-HKUST powder is immobilized in membrane pores under the condition of adsorption carried out in the flow-through mode. Enhanced contact and mass transfer are the two contributors for the faster adsorption by membrane adsorber, as described in our previous research [16][17][18][19][20][21][22] . The aggregation of the nano HP-HKUST-1 powder can be prevented beyond the scale of membrane pore size.…”

Section: Improved Adsorption Performancementioning

confidence: 99%

“…In our previous study, flowing synthesis has been developed to immobilize the MOFs particles in membrane pores [16][17][18][19][20][21][22] . During this process, the precursor solution of the MOFs particles is flowing through the membrane by an external force and the MOFs particles can be fabricated and immobilized in membrane pores simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Membrane adsorber with hierarchically porous HKUST-1 immobilized in membrane pores by flowing synthesis

Bai

Fan

Chen

et al. 2021

Preprint

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A membrane adsorber with hierarchically porous HKUST-1 (HP-HKUST-1) immobilized in membrane pores has been fabricated by flowing synthesis. The XRD characteristics indicated that the structure integrity of the HP-HKUST-1 immobilized in the membrane pores can be kept after template agent removed. Other characteristics presented by XPS, FTIR, SEM, TEM and BET proved the effective immobilization of HP-HKUST-1 in membrane pores. Compared with hydrothermal HKUST-1 powder, the adsorption capacity for Congo red and Methylene blue adsorption can be increased several times by hydrothermal HP-HKUST-1 powder, owing to the mesopores with rich active sites for adsorption. When the solution was flowed through the membrane adsorber, the adsorption rate for these adsorbates increased significantly, owing to the enhanced mass transfer in the confined space of the membrane pores with micro or nano scale. After going through seven adsorption-desorption experiments, the membrane adsorber with HP-HKUST-1 immobilized in membrane pores shows a remarkable repeatability.

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Tempospatially Confined Catalytic Membranes for Advanced Water Remediation

Lu,

Liu

2024

Advanced Materials

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The application of homogeneous catalysts in water remediation is limited by factors such as their excessive chemical and energy input, weak regenerability, and potential leaching. Heterogeneous catalytic membranes (CMs) offer a new approach to facilitating efficient, selective, and continuous pollutant degradation. Thus, integrating membranes and continuous filtration with heterogeneous advanced oxidation processes can promote thermodynamic and kinetic mass transfers in spatially confined intrapores and facilitate diffusion‐reaction processes. Despite the remarkable advantages of heterogeneous CMs, their engineering application has been practically restricted due to the fuzzy design criteria for specific applications. Herein, we critically review the recent advances in CMs for advanced water remediation and propose the design flow for tempospatially confined CMs. Further, we review state‐of‐the‐art CM materials and their catalytic mechanisms, after which we emphasize the tempospatial confinement mechanisms comprising the nanoconfinement effect, interface effect, and kinetic mass transfer, thus clarifying their roles in the construction and performance optimization of CMs. Additionally, we summarize the fabrication methods for CMs based on their catalysts and pore sizes and present an overview of their application and performance evaluations. Finally, we present future directions for CMs in materials research and water treatment.This article is protected by copyright. All rights reserved

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Catalytic membrane micro-reactor with nano ZIF-8 immobilized in membrane pores for enhanced Knoevenagel reaction of Benzaldehyde and Ethyl cyanoacetate

Cited by 40 publications

References 36 publications

Micromembrane absorber with deep‐permeation nanostructure assembled by flowing synthesis

Micromembrane absorber with deep‐permeation nanostructure assembled by flowing synthesis

Membrane adsorber with hierarchically porous HKUST-1 immobilized in membrane pores by flowing synthesis

Tempospatially Confined Catalytic Membranes for Advanced Water Remediation

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