Reactive Functionalized Membranes for Polychlorinated Biphenyl Degradation

Gui, Minghui; Ormsbee, Lindell; Bhattacharyya, Dibakar

doi:10.1021/ie400507c

Cited by 33 publications

(40 citation statements)

References 55 publications

(121 reference statements)

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“…In order to test the possible effect of ZVI on the dechlorination process, Fe loaded functionalized membranes were also studied. As demonstrated before, biphenyl is the main product of PCB degradation when using the Fe/Pd reductive pathway [33, 51]. However, for this coplanar PCB congener (i.e., PCB 126), the biphenyl yield was much lower than the theoretically attainable value.…”

Section: Resultsmentioning

confidence: 96%

“…The first two steps were achieved by following methods developed in our lab [33]. Functionalized PAA-PVDF membranes were soaked overnight in 500 ml NaCl solution (68.4 mM) for Na + exchange, in order to increase the ability of further Fe 2+ exchange.…”

Section: Methodsmentioning

confidence: 99%

“…Various of methods, such as the sol-gel process [38, 39], ion-exchange method [40], and in situ reduction [41], were reported for in situ preparation of nanoparticle-based membrane systems [42]. In our previous work, we have already reported the in-situ synthesis of iron-based nanoparticles (including ZVI, iron bimetallic, and iron oxide nanoparticles, in poly (acrylic acid) (PAA)-polyvinylidene fluoride (PVDF) membranes), as well as their application in trichloroethylene and PCB treatment [33, 34]. Carboxylate groups from PAA can chelate with metal ions, thereby preventing metal ion loss (i.e., recapture by ion exchange) and nanoparticle aggregation [43].…”

Section: Introductionmentioning

confidence: 99%

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Pore functionalized PVDF membranes with in-situ synthesized metal nanoparticles: Material characterization, and toxic organic degradation

Wan

Briot

Saad

et al. 2017

Journal of Membrane Science

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Functionalized PVDF membrane platforms were developed for environmentally benign in-situ nanostructured Fe/Pd synthesis and remediation of chlorinated organic compounds. To prevent leaching and aggregation, nanoparticle catalysts were integrated into membrane domains functionalized with poly (acrylic acid). Nanoparticles of 16–19 nm were observed inside the membrane pores by using focused ion beam (FIB). This technique prevents mechanical deformation of the membrane, compared to the normal SEM preparation methods, thus providing a clean, smooth surface for nanoparticles characterization. This allowed quantification of nanoparticle properties (size and distribution) versus depth underneath the membrane surface (0–20 µm). The results showed that nanoparticles were uniformly sized and evenly distributed inside the membrane pores. However, the size of nanoparticles inside the membrane pores was 13.9% smaller than those nanoparticles located on the membrane surface. Investigating nanoparticles inside membrane pores increases the accuracy of kinetic analysis and modeling aspects. Furthermore, the Fe/Pd immobilized membranes showed excellent performance in the degradation of chlorinated organics: Over 96% degradation of 3,3',4,4',5-pentachlorobiphenyl (PCB 126) was achieved in less than 15 s residence time in convective flow mode. The regeneration and reuse of this catalytic membrane system were also studied. Particles were examined in XRD upon formation, after deliberate oxidation, and after regeneration. The regenerated sample showed the same crystalline pattern as the original sample. Repeated degradation experiments demonstrated successful PCB 126 dechlorination with nanoparticles regenerated for four cycles with only a small loss in reactivity. It demonstrated that Fe/Pd immobilized membranes have the potential for large-scale remediation applications.

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pore functionalized PVDF membranes with in-situ synthesized metal nanoparticles: Material characterization, and toxic organic degradation

Wan

Briot

Saad

et al. 2017

Journal of Membrane Science

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“…We recently reported the development of full-scale polyacrylic acid (PAA) functionalized polyvinylidene fluoride (PVDF) membrane with iron/iron oxide nanoparticles for combined reductive and oxidative degradation of polychlorinated biphenyls (PCBs) in groundwater [23–24]. The same redox chemistry and membrane approach can be used for selenium removal from coal-fired power plant scrubber water, as iron has been reported to reduce selenate (VI) and selenite (IV) to elemental selenium (Se 0 ) and selenide (-II) [25–27].…”

Section: Introductionmentioning

confidence: 99%

Engineered iron/iron oxide functionalized membranes for selenium and other toxic metal removal from power plant scrubber water

Gui

Papp

Colburn

et al. 2015

Journal of Membrane Science

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The remediation of toxic metals from water with high concentrations of salt has been an emerging area for membrane separation. Cost-effective nanomaterials such as iron and iron oxide nanoparticles have been widely used in reductive and oxidative degradation of toxic organics. Similar procedures can be used for redox transformations of metal species (e.g. metal oxyanions to elemental metal), and/or adsorption of species on iron oxide surface. In this study, iron-functionalized membranes were developed for reduction and adsorption of selenium from coal-fired power plant scrubber water. Iron-functionalized membranes have advantages over iron suspension as the membrane prevents particle aggregation and dissolution. Both lab-scale and full-scale membranes were prepared first by coating polyvinylidene fluoride (PVDF) membranes with polyacrylic acid (PAA), followed by ion exchange of ferrous ions and subsequent reduction to zero-valent iron nanoparticles. Water permeability of membrane decreased as the percent PAA functionalization increased, and the highest ion exchange capacity (IEC) was obtained at 20% PAA with highly pH responsive pores. Although high concentrations of sulfate and chloride in scrubber water decreased the reaction rate of selenium reduction, this was shown to be overcome by integration of nanofiltration (NF) and iron-functionalized membranes, and selenium concentration below 10 μg/L was achieved.

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“…The incorporation of nanomaterials into the membranes provides added benefits through increased reactivity with different functionality. Gui et al [57] reported the dechlorination of 2-chlorobiphenyl (2-CBP) in the aqueous phase by a reactive membrane system. Fe/Pd bimetallic nanoparticles were synthesized (in situ) within poly(acrylic acid) (PAA) functionalized polyvinylidene fluoride (PVDF) membranes for degradation of polychlorinated biphenyls (PCBs).…”

Section: Carbon-halogen Bond Cleavage Of Hocs In Water Catalyzed By Pmentioning

confidence: 99%

Degradation of toxic halogenated organic compounds by iron-containing mono-, bi- and tri-metallic particles in water

Colombo

Dragonetti

Magni

et al. 2015

Inorganica Chimica Acta

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Reactive Functionalized Membranes for Polychlorinated Biphenyl Degradation

Cited by 33 publications

References 55 publications

Pore functionalized PVDF membranes with in-situ synthesized metal nanoparticles: Material characterization, and toxic organic degradation

Pore functionalized PVDF membranes with in-situ synthesized metal nanoparticles: Material characterization, and toxic organic degradation

Engineered iron/iron oxide functionalized membranes for selenium and other toxic metal removal from power plant scrubber water

Degradation of toxic halogenated organic compounds by iron-containing mono-, bi- and tri-metallic particles in water

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