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You searched for subject:(Microfiltration PVDF Membrane). Showing records 1 – 2 of 2 total matches.

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Universidade Nova

1. Snisarenko, Dmytro. Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications.

Degree: 2013, Universidade Nova

Dissertation presented to Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa for obtaining the master degree in Membrane Engineering

The optimal methodology for flat supported hydrophobic microporous poly(vinylidene) fluoride (PVDF) industrial membranes (Fortex 0.1, Fortex 0.2, Fortex 1.2 and Fortex 3.0) production were developed with implementation of wet phase-inversion technique. The effect of different indicators of the production conditions, such as composition of polymer solution, quantity and type of additives, dissolving temperature, composition and temperature of the coagulation bath were studied. All the comparisons were performed in the narrow range of values in order to have better understanding of how slight deviation of each parameter can influence the performance of the industrially manufactured membrane. During the development process it was observed that the increase of dissolving temperature results in formation of membrane with more open structure, justified by higher values of air flow (AF) and lower critical water entry pressure (water break through (WBT)). Moreover, the low molecular weight inorganic lithium salt has stronger effect on membrane performance than organic pore former applied. After the optimization of production parameters for each type of membranes at the laboratory scale, the implementation of these conditions was realized at industrial scale. The good reproducibility of membrane characteristics prepared at laboratory and industrial scale was observed for three membrane types. The industrial trial for Fortex 0.2 membrane was not successful and this result was hypothetically related to the high viscosity of the casting solution. Additionally, it was demonstrated that absorbance of air moisture by polymer solution may significantly influence properties of manufactured membranes. Moreover, the industrially manufactured membranes as well as laboratory samples of Fortex 0.2 were characterized by means of scanning electron microscope, permporometry and Fourier Transform Infrared Spectroscopy. It was shown that usage of different solvent/non-solvent pairs (DMAc/water and DMAc/alcohol) was leading to the different membrane morphologies. Basing on permporometry test results, the largest active pores inside membranes were identified. Finally, it was shown that all the developed membranes possess β and γ crystalline phases and only Fortex 0.1 exhibited presence of α structure.

The EM3E Master is an Education Programme supported by the European Commission, the European Membrane Society (EMS), the European Membrane House (EMH), and a large international network of industrial companies, research centres and universities

Advisors/Committee Members: Querze, Luca, Coelhoso, Isabel, Crespo, João.

Subjects/Keywords: PVDF membrane; Microfiltration; Phase inversion; Dissolving temperature; Soft and harsh nonsolvents

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Snisarenko, D. (2013). Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/10421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Snisarenko, Dmytro. “Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications.” 2013. Thesis, Universidade Nova. Accessed January 22, 2021. http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/10421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Snisarenko, Dmytro. “Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications.” 2013. Web. 22 Jan 2021.

Vancouver:

Snisarenko D. Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications. [Internet] [Thesis]. Universidade Nova; 2013. [cited 2021 Jan 22]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/10421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Snisarenko D. Preparation and characterization of microfiltration flat polymeric membranes for biomedical applications. [Thesis]. Universidade Nova; 2013. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/10421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Kentucky

2. Islam, Mohammad Saiful. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.

Degree: 2020, University of Kentucky

Microfiltration polyvinylidene fluoride (PVDF) membranes have distinct advantage for open structure in terms of high internal surface area and ease of access in the pore domain. Functionalization of PVDF membranes with different functional groups (-COOH, -OH, -SH) enables responsive (pH, temperature) properties to membrane, tuning of effective pore size, controlling permeate flux. PVDF microfiltration membrane functionalization with suitable responsive polymer such as poly acrylic acid (PAA) to incorporate carboxyl (-COOH) group enables further modification of functionalized PAA-PVDF membranes for different application ranging from catalysis, bio reactor to heavy metal sorption platform. As a catalytic reactor bed, this PAA-PVDF membranes are very desirable platform for in-situ synthesis of catalytic nanoparticles for conducting a wide range of reactions. As a bio reactor, PAA-PVDF membrane with a net charge have been used to electrostatically immobilize enzymes for conducting catalytic reactions. Functionalization of PVDF membrane also allow for the development of high capacity heavy metal sorbents by modifying existing functional groups (-COOH) to other functional groups (-SH) to adsorb heavy metal cations from contaminated water. Hydrophilic polymers with carboxylic (-COOH) groups are studied in different functionalization processes especially in preparation of responsive (pH) membranes. To understand the role of membrane pore polymerization condition on the properties of functionalized membrane a systematic study has been conducted, specifically, the effects of polymerization on the membrane mass gain, water permeability, Pd-Fe nanoparticle (NP) loading, of pore functionalized polyvinylidene fluoride (PVDF) membranes. In this study, monomer (acrylic acid (AA)) and cross-linker (N, N′- methylene-bis (acrylamide)) concentrations were varied from 10 to 20 wt% of polymer solution and 0.5-2 mol% of monomer concentration, respectively. Results showed that responsive behavior of membrane could be tuned in terms of water permeability over a range of 270-1 Lm-2 h-1 bar-1, which is a function of water pH. The NP size on the membrane surface was found in the range of 16-23 nm. NP loading was found to vary from 0.21 to 0.94 mg per cm2 of membrane area depending on the variation of available carboxyl groups in membrane pore domain. The NPs functionalized membranes were then tested as a platform for the degradation of 3,3',4,4',5-pentachlorobiphenyl (PCB 126) and understand the effect of NP loading of the rate of degradation of PCB 126. The observed batch reaction rate (Kobs) for PCB 126 degradation for per mg of catalyst loading was found 0.08-0.1 h-1. Degradation study in convective flow mode shows 98.6% PCB 126 is degraded at a residence time of 46.2 s. The corresponding surface area normalized reaction rate (Ksa) is found about two times higher than Ksa of batch degradation; suggesting elimination of the effect of diffusion resistance for degradation of PCB 126 in convective flow mode operation. A layer-by-layer approach…

Subjects/Keywords: Microfiltration PVDF Membrane; Nanoparticles; Catalytic Membrane Reactor; Enzyme Immobilized Membrane; Thiol Functionalized Membrane; Hollow Nanoparticles; Membrane Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Islam, M. S. (2020). MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/cme_etds/121

Chicago Manual of Style (16th Edition):

Islam, Mohammad Saiful. “MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.” 2020. Doctoral Dissertation, University of Kentucky. Accessed January 22, 2021. https://uknowledge.uky.edu/cme_etds/121.

MLA Handbook (7th Edition):

Islam, Mohammad Saiful. “MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION.” 2020. Web. 22 Jan 2021.

Vancouver:

Islam MS. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. [Internet] [Doctoral dissertation]. University of Kentucky; 2020. [cited 2021 Jan 22]. Available from: https://uknowledge.uky.edu/cme_etds/121.

Council of Science Editors:

Islam MS. MICROFILTRATION MEMBRANE PORE FUNCTIONALIZATION APPROACHES FOR CHLORO-ORGANIC REMEDIATION TO HEAVY METAL SORPTION. [Doctoral Dissertation]. University of Kentucky; 2020. Available from: https://uknowledge.uky.edu/cme_etds/121

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