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You searched for subject:(Enzyme membrane reactor). Showing records 1 – 2 of 2 total matches.

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University of Kentucky

1. 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 March 05, 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. 05 Mar 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 Mar 05]. 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


University of Ottawa

2. Li, Aotian. Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors .

Degree: 2020, University of Ottawa

Biocatalytic membranes (BMs) have promising applications in a diversity of fields including food, pharmaceutical and water treatment industries. Of particular relevance, Alcalase is a commercially important protease that has been applied for the production of peptides from the hydrolysis of proteins. In this study, two different approaches were applied for the modification of electrospun polyacrylonitrile nanofibrous membranes (EPNMs) for Alcalase immobilization. The first approach is alkali modification of EPNMs followed by EDC/NHS coupling for covalent bonding with Alcalase, whereas the other is based on polydopamine coating with or without glutaraldehyde grafting as a covalent linker. Immobilized Alcalase on these prepared BMs were studied and compared with free enzymes. It was found that the stabilities of Alcalase on BMs created using both approaches were improved, which enabled their reuse of 10 cycles with significant retention of enzymatic activity. A continuous reactor housing BMs were tested for hydrolysis of both model substrate, azo-casein and soybean meal protein (SMP). It was found that decreasing flux could improve the extent of hydrolysis and that a single-layer reactor can hydrolyze about 50% of the substrate to peptides with the molecular weight of 10 kDa or less. Hydrolysis of SMPs was demonstrated in a continuous five-layer BM reactor and both BMs showed excellent hydrolysis capacity. This study provides the groundwork for the development of high-efficiency BM for continuous and cost-effective protein hydrolysis for the production of value-added peptides.

Subjects/Keywords: Biocatalytic Membrane; Enzyme Immobilization; Electrospun PAN Nanofibrous Membrane; Protein Hydrolysis; Continuous Reactor

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

APA (6th Edition):

Li, A. (2020). Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/40473

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):

Li, Aotian. “Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors .” 2020. Thesis, University of Ottawa. Accessed March 05, 2021. http://hdl.handle.net/10393/40473.

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

MLA Handbook (7th Edition):

Li, Aotian. “Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors .” 2020. Web. 05 Mar 2021.

Vancouver:

Li A. Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors . [Internet] [Thesis]. University of Ottawa; 2020. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10393/40473.

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

Council of Science Editors:

Li A. Development of Biocatalytic Nanofibrous Membranes Using Different Modification Approaches for Continuous Proteolytic Reactors . [Thesis]. University of Ottawa; 2020. Available from: http://hdl.handle.net/10393/40473

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

.