Molecular Imprinting of Metal-Organic frameworks (MOFs) for Selective Separations

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dc.contributor.advisorShimizu, George
dc.contributor.advisorLing, Chang-Chun
dc.contributor.authorEvans, David
dc.contributor.committeememberJalilehvand, Farideh
dc.date2022-06
dc.date.accessioned2022-05-04T16:19:09Z
dc.date.available2022-05-04T16:19:09Z
dc.date.issued2022-04
dc.description.abstractThis thesis explores the idea of using chromium(III) ions and an orthogonal polyaromatic phosphonate linker to produce a stable metal-organic framework (MOF) for the separation of xylene isomers. This began by creating a charge-assisted hydrogen-bonded metal-organic framework (HMOF) that uses weaker interactions to hold the framework together. The orthogonalized phosphonate creates pores due to its bulky nature that prevents efficient ligand packing. In tandem, this allows for the inclusion of guest molecules within the HMOF structure. Once the guest-incorporated structure is formed, heating can remove water molecules from the HMOF to form coordination bonds between the chromium and the phosphonate ligand. This dehydration locks the template in place as it converts to a coordinated metal-organic framework (MOF). The template for this technique is of great importance since you can imprint the pore to a specific molecule. For this study, the xylene isomers ortho, meta, and para, were looked at for separation. The separation of xylenes is of great importance since the different isomers are used in a variety of different applications, such as para-xylene for terephthalic acid (TPA) to manufacture polyethylene terephthalate (PET). The problem with separating xylenes is how expensive the separation is. Since the xylene isomers have very similar boiling points and sizes, either cryogenic distillation or recrystallization has to be performed to acquire a pure product. On this note, three different chromium phosphonate HMOFs were developed. The first structure incorporated a para-xylene template (HCALF 50αP) while the second structure incorporated ortho-xylene as the template (HCALF 50α)). The final structure used meta-xylene as a template (HCALF 50M). These HMOFs were dehydrated into the corresponding MOF structures and used to test selective xylene separation. Initial studies using a static separation and nuclear magnetic resonance (NMR) spectroscopy were conducted followed by a flow-through separation using high-pressure liquid chromatography (HPLC) and a MOF-packed column. The findings were intriguing showing selectivity towards para-xylene for some of the materials. Most notable is that HCALF 50βM showed anti-selectivity towards para-xylene allowing it to flow freely through and making it easier to collect.en_US
dc.identifier.citationEvans, D. (2022). Molecular imprinting of metal-organic frameworks (MOFs) for selective separations (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/39726
dc.identifier.urihttp://hdl.handle.net/1880/114606
dc.language.isoengen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subject.classificationEducation--Sciencesen_US
dc.subject.classificationEducation--Tests and Measurementsen_US
dc.subject.classificationBiology--Molecularen_US
dc.subject.classificationChemistry--Inorganicen_US
dc.subject.classificationEngineering--Chemicalen_US
dc.titleMolecular Imprinting of Metal-Organic frameworks (MOFs) for Selective Separationsen_US
dc.typemaster thesisen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
ucalgary.item.requestcopytrueen_US
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