An efficient and recyclable Pickering magnetic interface biocatalyst: application in biodiesel production

Liu, Xiaobo; Mao, Yuhua; Yu, Siyang; Zhang, Hao; Hu, Kecheng; Zhu, Lingyu; Ji, Jianbing; Wang, JianLi

doi:10.1039/d0gc03527k

Cited by 36 publications

(20 citation statements)

References 45 publications

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“…In addition, the transesterification carried out under a static Pickering emulsion also shows satisfactory catalytic activity over five runs (Figure d right (97.3%)). Compared with the reported studies, the as-prepared PICs exhibit superior catalytic activity. − …”

Section: Results and Discussionmentioning

confidence: 82%

Magnetic Nanoparticles with In Situ Surface Growing Polymeric Brushes as Reactive Pickering Interfacial Catalysts for Biphasic Reactions

et al. 2021

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The intensification of catalytic reaction and droplet manipulation in a liquid–liquid (L–L) biphasic system has been widely focused in this research. The surface engineering of magnetic materials offers a reasonable tactic for the design of magnetic Pickering interfacial catalysts (MPICs), which substantially bridges the gap of homogeneous and heterogeneous catalysis for promoting efficient and selective transformation of resources. In this study, we control the growth of organic base monomer brushes by surface-initiated reversible addition–fragmentation chain transfer (SIRAFT) polymerization to afford a magnetopolymeric nanocatalysts Fe3O4@PS-PM. The surface engineering strategy enables us to simply tune the surface wettability and active site content for the manipulation of emulsion catalysis. In a biphasic reaction system (i.e., transesterification and epoxidation), the catalytic performance of an emulsion system is more than twice that of an unemulsified system, which is attributed to the enhancement effect of the Pickering emulsion microenvironment. In addition, the inherent paramagnetism demonstrates that MPICs can be swiftly desorbed and recovered from the oil–water interface and showed attractive catalytic activity and stability over five runs. The practical surface engineering has promising prospects for construction and adjustment of magnetically separable PICs and enables accessible manipulation of green chemical transformation based on a versatile Pickering emulsion platform.

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Section: Results and Discussionmentioning

confidence: 82%

Magnetic Nanoparticles with In Situ Surface Growing Polymeric Brushes as Reactive Pickering Interfacial Catalysts for Biphasic Reactions

et al. 2021

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“…Magnetic field was further introduced for the magnetic field-responsive separation of the nano-catalysts under PIC. [119] Wang et al [120] endowed the catalysts with magneticand CO 2 -dual-responsive abilities via the introduction of Fe 3 O 4 and 2-diethylaminoethyl methacrylate (DEA). This not only provided the smart emulsion platform for the benzyl alcohol oxidation, but also filled the gap of nanocatalyst separation.…”

Section: Smart Emulsion Reaction Systemmentioning

confidence: 99%

“…Magnetic field was further introduced for the magnetic field‐responsive separation of the nano‐catalysts under PIC [119] . Wang et al [120] .…”

Section: Catalytic Applications Beyond the Limits Of The Traditional ...mentioning

confidence: 99%

Pickering Emulsion Catalysis: Interfacial Chemistry, Catalyst Design, Challenges, and Perspectives

Wei

et al. 2022

Angewandte Chemie

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Pickering emulsions are particle‐stabilized surfactant‐free dispersions composed of two immiscible liquid phases, and emerge as attractive catalysis platform to surpass traditional technique barrier in some cases. In this review, we have comprehensively summarized the development and the catalysis applications of Pickering emulsions since the pioneering work in 2010. The explicit mechanism for Pickering emulsions will be initially discussed and clarified. Then, summarization is given to the design strategy of amphiphilic emulsion catalysts in two categories of intrinsic and extrinsic amphiphilicity. The progress of the unconventional catalytic reactions in Pickering emulsion is further described, especially for the polarity/solubility difference‐driven phase segregation, “smart” emulsion reaction system, continuous flow catalysis, and Pickering interfacial biocatalysis. Challenges and future trends for the development of Pickering emulsion catalysis are finally outlined.

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“…Attempts have been made to synthesize stimuli-responsive particles, whose surface wettability frequently alters in response to an external stimulus. Accordingly, the formed emulsions exhibit on-demand emulsification/demulsification behavior as a result of the particle adsorption/desorption from the interface triggered by, for example, magnetic fields, pH, , CO 2 , temperature, or light . Alternatively, addition of chemical additives like non-ionic surfactants to Pickering emulsions can change the wettability of interfacially adsorbed particles so that they detach from the interface, contributing to phase separation .…”

Section: Introductionmentioning

confidence: 99%

Demulsification of Bacteria-Stabilized Pickering Emulsions Using Modified Silica Nanoparticles

Xie

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Pickering emulsions stabilized by bacteria acting as particle emulsifiers are new platforms for microbial transformations of hydrophobic chemicals. However, their high stability often hampers demulsification during downstream processing. Since the existing methods (like addition of surfactants) to demulsify bacteria-stabilized Pickering emulsions have negative effects, new practical methods need to be developed. Here, using chemically modified fumed silica particles with different hydrophobicity, the demulsification of W/O Pickering emulsions stabilized by Mycobacterium neoaurum whole cells was first studied. The binary particle-stabilized emulsions exhibited phase inversion and dewatering induced by the coalescence of W/O emulsions or creaming of O/W emulsions. The silica particle hydrophobicity and concentration were the important parameters influencing the emulsion type, droplet morphology, and dewatering rate. The highest dewatering rate and largest droplet size were obtained at the inversion point from W/O to O/W. Confocal microscopy showed that no interaction between the bacteria and silica particles existed and the silica particle adsorption at the interface induced the detachment of bacteria from the interface, revealing that there was competitive adsorption between the binary particles at the interface. Based on these results, we suggested that the average hydrophobicity of the binary particles at the interface would determine the emulsion type and stability. Finally, this strategy was successfully applied to the demulsification of the Pickering emulsion formed during microbial transformation of sterols. Overall, this study provides a new strategy to demulsify Pickering emulsions by addition of another particle emulsifier. This is also the first example of separation of products as well as organic phases after microbial transformation in Pickering emulsions.

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An efficient and recyclable Pickering magnetic interface biocatalyst: application in biodiesel production

Abstract: A magnetically responsive Pickering interface biocatalytic system was used as an efficient platform for the separation and reuse of catalysts in biodiesel production.

Cited by 36 publications

References 45 publications

Magnetic Nanoparticles with In Situ Surface Growing Polymeric Brushes as Reactive Pickering Interfacial Catalysts for Biphasic Reactions

Magnetic Nanoparticles with In Situ Surface Growing Polymeric Brushes as Reactive Pickering Interfacial Catalysts for Biphasic Reactions

Pickering Emulsion Catalysis: Interfacial Chemistry, Catalyst Design, Challenges, and Perspectives

Demulsification of Bacteria-Stabilized Pickering Emulsions Using Modified Silica Nanoparticles

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