POMbranes: polyoxometalate-functionalized block copolymer membranes for oxidation catalysis

Romanenko, Iuliia; Lechner, Manuel; Wendler, Felix; Hörenz, Christoph; Streb, Carsten; Schacher, Felix H.

doi:10.1039/c7ta03220j

Cited by 26 publications

(22 citation statements)

References 52 publications

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“…Membrane-based separation offers a scalable, economically and environmentally friendly tool for numerous applications, e.g., biochemical and pharmaceutical processing, water purication, and wastewater treatment. [1][2][3][4][5] Although the interest in developing high-performance membranes has been growing from diverse inorganic, organic, and composite materials, [6][7][8][9][10][11][12][13] a longstanding goal in membrane technology is still to pursue an ideal membrane with a high permeance, good selectivity and strong fouling resistance.…”

Section: Introductionmentioning

confidence: 99%

High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

et al. 2020

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Section: Introductionmentioning

confidence: 99%

High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

et al. 2020

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“…For this immobilization different mechanisms are possible. The simplest method is an electrostatic attachment, that is realized by opposite charges of catalyst and membrane surface [1,8] . Another option is covalent immobilization.…”

Section: Introductionmentioning

confidence: 99%

A Molecular Photosensitizer in a Porous Block Copolymer Matrix‐Implications for the Design of Photocatalytically Active Membranes

Chettri

Kruse

Jha

et al. 2021

Chemistry A European J

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Recently, porous photocatalytically active block copolymer membranes were introduced, based on heterogenized molecular catalysts. Here, we report the integration of the photosensitizer, i. e., the light absorbing unit in an intermolecular photocatalytic system into block copolymer membranes in a covalent manner. We study the resulting structure and evaluate the orientational mobility of the photosensitizer as integral part of the photocatalytic system in such membranes. To this end we utilize transient absorption anisotropy, highlighting the temporal reorienta-tion of the transition dipole moment probed in a femtosecond pump-probe experiment. Our findings indicate that the photosensitizer is rigidly bound to the polymer membrane and shows a large heterogeneity of absolute anisotropy values as a function of location probed within the matrix. This reflects the sample inhomogeneity arising from different protonation states of the photosensitizer and different intermolecular interactions of the photosensitizers within the block copolymer membrane scaffold.

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“…POMs are a unique class of metal–oxygen cluster species usually in nano-sizes ranging from ~5 Å to 40 Å, with versatile composition, scale, structure, charge distribution, and redox potential [ 10 ]. They are promising candidates to construct advanced catalytic membranes [ 11 , 12 ], adsorptive membranes [ 7 ], and forward osmosis membranes [ 5 ], etc. POMs can be integrated into the matrix of the membrane by blending [ 13 ] or onto the membrane surface by plasma treatment [ 14 ], grafting polymerization [ 15 ], and sol-gel coating [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Property Characterization and Mechanism Analysis of Polyoxometalates-Functionalized PVDF Membranes by Electrochemical Impedance Spectroscopy

et al. 2020

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Polyoxometalates (POMs) has proved its advantage in constructing high-performance nanocomposite membranes such as catalytic membranes, adsorptive membranes, and forward osmosis membranes. However, it is challenging or tedious to characterize its distribution and effect on the membrane structures due to the equipment resolution limitation, discrete nano-scaled structures of POMs, and limited doping amount compared to the polymeric membrane matrix. In this paper, POMs-functionalized polyvinylidene fluoride (PVDF) membranes were fabricated by phase inversion combined with the sol-gel method, and electrochemical impedance spectroscopy (EIS) was utilized to analyze the nanocomposite membrane intrinsic properties. Through adjusting the additives in the sol-forming process, a set of membranes with varied intrinsic properties were developed accordingly. The wetting degree of the membranes related to the hydrophilic nature of the membrane surfaces had a crucial influence on the impedance measurements at the early stage. Through EIS analysis, it was demonstrated that the amination of the membrane matrix through (3-aminopropyl)trimethoxysilane (APTMS) treatment and the immobilization of POMs through electrostatic attraction would not generate new pore structures into the membrane and only alter the membrane surface roughness and composition. To my knowledge, it is the first time that EIS was utilized to characterize the hydrophilicity of the membranes and pore structures of the POMs-modified membranes. Our findings indicate that EIS can provide valuable information for probing the structures of other nano-materials-incorporated membranes.

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POMbranes: polyoxometalate-functionalized block copolymer membranes for oxidation catalysis

Abstract: The immobilization of homogeneous catalysts within nanoporous membranes gives access to catalytically active and multi-functional composite materials, e.g. for use in flow reactors.

Cited by 26 publications

References 52 publications

High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

High-performance asymmetric isoporous nanocomposite membranes with chemically-tailored amphiphilic nanochannels

A Molecular Photosensitizer in a Porous Block Copolymer Matrix‐Implications for the Design of Photocatalytically Active Membranes

Property Characterization and Mechanism Analysis of Polyoxometalates-Functionalized PVDF Membranes by Electrochemical Impedance Spectroscopy

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