Preparation of hollow spherical covalent organic frameworks via Oswald ripening under ambient conditions for immobilizing enzymes with improved catalytic performance

Zhao, Hao; Liu, Guanhua; Liu, Yunting; Zhou, Liya; Ma, Li; He, Ying; Zheng, Xiaobing; Gao, Jing; Jiang, Yanjun

doi:10.1007/s12274-022-4769-5

Cited by 30 publications

(23 citation statements)

References 45 publications

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“…First, the hollow spherical COF (HCOF) with high stability was prepared by the Ostwald ripening method according to our previous research. 14 The scanning electron microscopy (SEM, Figure 1b) and transmission electron microscopy (TEM, Figure 1c) images showed that HCOF was a well-dispersed hollow sphere with a diameter of 500−600 nm, and also displayed the connection of inner cavity to the outside via through-holes. As shown in Figure S7, the strong characteristic peaks of PXRD of HCOF were consistent with the AA stack structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The preparation process of the Rh-COF Bpy @HCOF CSHS photocatalyst is illustrated in Figure a. First, the hollow spherical COF (HCOF) with high stability was prepared by the Ostwald ripening method according to our previous research . The scanning electron microscopy (SEM, Figure b) and transmission electron microscopy (TEM, Figure c) images showed that HCOF was a well-dispersed hollow sphere with a diameter of 500–600 nm, and also displayed the connection of inner cavity to the outside via through-holes.…”

Section: Resultsmentioning

confidence: 99%

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Hollow Rh-COF@COF S-Scheme Heterojunction for Photocatalytic Nicotinamide Cofactor Regeneration

et al. 2023

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Photocatalytic regeneration of a nicotinamide cofactor, nicotinamide adenine dinucleotide phosphate (NADPH), has emerged as an ideal cascade partner for combination with enzymatic transformations, but it still suffers from low efficiency due to the recombination of photogenerated charge carriers. Herein, a hierarchical Rh-covalent organic framework (COF)@COF core–shell hollow sphere (CSHS) with S-scheme heterojunction is proposed to enhance the charge carrier transfer and utilization in photocatalysis to regenerate the expensive NADPH. The hierarchical Rh-COFBpy@ hollow spherical COF (HCOF) CSHS was prepared by simple sequential in situ growth. The turnover frequency of Rh-COFBpy@HCOF25 for NADPH regeneration reached 2.6 mmol·gRh‑COF –1·h–1, which was 3.7 times that of pure Rh-COFBpy under visible light. Density functional theory calculation and X-ray photoelectron spectroscopy analysis showed that an internal electric field directed from Rh-COFBpy to HCOF was formed in Rh-COFBpy@HCOF CSHS, which accelerated the photogenerated electron transfer from HCOF to Rh-COFBpy. In situ irradiated XPS analyses and photoirradiated Kelvin probe measurement revealed the S-scheme charge-transfer mechanism within Rh-COFBpy@HCOF. The Rh-COFBpy@HCOF photocatalytic NADPH regeneration system was further coupled with enzymatic reduction of CC, achieving a photoenzyme cascade reaction. This work provides a protocol for the design and utilization of COF-based artificial photosynthetic systems.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hollow Rh-COF@COF S-Scheme Heterojunction for Photocatalytic Nicotinamide Cofactor Regeneration

et al. 2023

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“…[34] Nevertheless, the development of the self-templating method is still impeded by the lack of universality, unsatisfactory control of morphology and long ripening time. [21,33] Therefore, it is necessary to develop a universal and facile synthetic strategy for the controllable preparation of HCOFs with various hollow nanostructures to achieve extensive applications.…”

Section: Introductionmentioning

confidence: 99%

Construction of Multiform Hollow‐Structured Covalent Organic Frameworks via a Facile and Universal Strategy for Enhanced Sonodynamic Cancer Therapy

et al. 2023

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The special structural morphology of hollow covalent organic frameworks (HCOFs) has an important influence on their applications. However, the rapid and precise control of morphology for HCOFs still remains largely challenging. Herein, we present a facile and universal two-step strategy based on solvent evaporation and oxidation of imine bond for the controllable synthesis of HCOFs. The strategy enables to prepare HCOFs in a greatly shortened reaction time and seven kinds of HCOFs are fabricated by the oxidation of imine bond via hydroxyl radicals ( * OH) generated from Fenton reaction. Importantly, a fascinating library of HCOFs with diverse nanostructures, including bowllike, yolk-shell, capsule-like and flower-like morphologies, has been ingeniously constructed. Owing to the large cavities, the obtained HCOFs are ideal candidates for drug delivery, which are employed to load five small molecule drugs, achieving the enhanced sonodynamic cancer therapy in vivo.

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“…In contrast, self‐templating strategy based on the Ostwald ripening process can avoid the use of templates and largely simplify the reaction procedures, by which the first preparation of hollow COF spheres was reported [34] . Nevertheless, the development of the self‐templating method is still impeded by the lack of universality, unsatisfactory control of morphology and long ripening time [21, 33] . Therefore, it is necessary to develop a universal and facile synthetic strategy for the controllable preparation of HCOFs with various hollow nanostructures to achieve extensive applications.…”

Section: Introductionmentioning

confidence: 99%

“…To date, some strategies including hard-templating method, [28] soft-templating method, [29] and self-templating method, [32,33] have been put forward to prepare HCOFs. In detail, hard-and soft-templating methods require the introduction and subsequent removal of templates, resulting in a complex and time-consuming reaction process, while leading to the damage to original structure of COFs.…”

Section: Introductionmentioning

confidence: 99%

Construction of Multiform Hollow‐Structured Covalent Organic Frameworks via a Facile and Universal Strategy for Enhanced Sonodynamic Cancer Therapy

et al. 2023

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Preparation of hollow spherical covalent organic frameworks via Oswald ripening under ambient conditions for immobilizing enzymes with improved catalytic performance

Cited by 30 publications

References 45 publications

Hollow Rh-COF@COF S-Scheme Heterojunction for Photocatalytic Nicotinamide Cofactor Regeneration

Hollow Rh-COF@COF S-Scheme Heterojunction for Photocatalytic Nicotinamide Cofactor Regeneration

Construction of Multiform Hollow‐Structured Covalent Organic Frameworks via a Facile and Universal Strategy for Enhanced Sonodynamic Cancer Therapy

Construction of Multiform Hollow‐Structured Covalent Organic Frameworks via a Facile and Universal Strategy for Enhanced Sonodynamic Cancer Therapy

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