Aqueous-phase synthesis of PAA in PVDF membrane pores for nanoparticle synthesis and dichlorobiphenyl degradation

Smuleac, V.; Bachas, Leonidas G.; Bhattacharyya, Dibakar

doi:10.1016/j.memsci.2009.09.052

Cited by 98 publications

(88 citation statements)

References 36 publications

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“…58,59 Here, P(NIPAAm-AA) hydrogel was utilized because of the demand of not only transition but also hydrophilic ion exchange sites, like —COOH. The use of PAA hydrogel without NIPAAm could make it difficult to modulate hydrophobicity in the same platform.…”

Section: Resultsmentioning

confidence: 99%

Temperature responsive hydrogel with reactive nanoparticles

Xiao¹,

Isner²,

Hilt³

et al. 2012

J of Applied Polymer Sci

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The application of temperature responsive hydrogels with ion-exchange domain for nanoscale catalytic reactions is an emerging and attractive area because of the combination of individual unique features: temperature responsive tunability by the polymer domain and the high catalytic reactivity of the nanomaterial. Here, we report the entrapment and/or direct synthesis of reactive Fe and Fe/Pd nanoparticles (about 40–70 nm) in a temperature responsive hydrogel network (N-isopropylacrylamide (NIPAAm), and NIPAAm—PAA). These nanoparticles are stabilized in the hydrogel network and the dechlorination (using trichloroethylene, TCE, as a model compound) reactivity in water is enhanced and controllable in the temperature range of 30–34°C involving polymer domain transitions at lower critical solution temperature (LCST) from hydrophilic to collapsed hydrophobic state. Water fraction modulation of the network and the enhancement of pollutant partitioning by the thermally responsive polymers play an important role in the catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Temperature responsive hydrogel with reactive nanoparticles

Xiao¹,

Isner²,

Hilt³

et al. 2012

J of Applied Polymer Sci

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“…22, 28 PVDF-PAA membranes were soaked in NaCl (68.4 mM) solution for cation exchange. The ionized carboxyl groups chelated with Na + while releasing H + .…”

Section: Methodsmentioning

confidence: 99%

Reactive Functionalized Membranes for Polychlorinated Biphenyl Degradation

Gui

Ormsbee

Bhattacharyya

2013

Ind. Eng. Chem. Res.

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Membranes have been widely used in water remediation (e.g. desalination and heavy metal removal) because of the ability to control membrane pore size and surface charge. The incorporation of nanomaterials into the membranes provides added benefits through increased reactivity with different functionality. In this study, we report the dechlorination of 2-chlorobiphenyl in the aqueous phase by a reactive membrane system. Fe/Pd bimetallic nanoparticles (NPs) were synthesized (in-situ) within polyacrylic acid (PAA) functionalized polyvinylidene fluoride (PVDF) membranes for degradation of polychlorinated biphenyls (PCBs). Biphenyl formed in the reduction was further oxidized into hydroxylated biphenyls and benzoic acid by an iron-catalyzed hydroxyl radical (OH•) reaction. The formation of magnetite on Fe surface was observed. This combined pathway (reductive/oxidative) could reduce the toxicity of PCBs effectively while eliminating the formation of chlorinated degradation byproducts. The successful manufacturing of full-scale functionalized membranes demonstrates the possibility of applying reactive membranes in practical water treatment.

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“…From these results, an effective pore diameter was calculated using a modified Hagen-Poiseuille’s equation. 57 The effective pore size based on flow is larger for OmpF membranes than for non-OmpF membranes, which demonstrates a flux enhancement due to the presence of OmpF. Note that this pore size is not an actual value of the pores but rather represents a nominal pore size.…”

Section: Resultsmentioning

confidence: 93%

Layer-by-layer assembled membranes with immobilized porins

et al. 2017

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With the synthesis and functionalization of membranes for selective separations, reactivity, and stimuli responsive behavior arises new and advanced opportunities. The integration of bio-based channels is one of these advancements in membrane technologies. By a layer-by-layer (LbL) assembly of polyelectrolytes, outer membrane protein F trimers (OmpF) or “porins” from Escherichia coli with a central pore of ~2 nm diameter at its opening and ~0.7 × 1.1 nm at its constricted region are immobilized within the pores of poly(vinylidene fluoride) microfiltration membranes, as opposed to traditional ruptured lipid bilayer or vesicles processes. These OmpF-membranes demonstrate selective rejections of non-charged organics over ionic solutes, allowing the passage of salts up to 2 times higher than traditional nanofiltration membranes starting with rejections of 84% for 0.4–1.0 kDa organics. The presence of charged groups in OmpF membranes also leads to pH-dependent salt rejection through Donnan exclusion. These OmpF-membranes also show exceptional durability and stability, delivering consistent and constant permeability and recovery for over 160 h of operation. Characterization of solutions containing OmpF, and membranes were conducted during each stage of the process, including detection by fluorescence labelling (FITC), zeta potential, pH responsiveness, flux changes, and rejections of organic-inorganic solutions.

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Aqueous-phase synthesis of PAA in PVDF membrane pores for nanoparticle synthesis and dichlorobiphenyl degradation

Cited by 98 publications

References 36 publications

Temperature responsive hydrogel with reactive nanoparticles

Temperature responsive hydrogel with reactive nanoparticles

Reactive Functionalized Membranes for Polychlorinated Biphenyl Degradation

Layer-by-layer assembled membranes with immobilized porins

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