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Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water
Dissertation (MSc (Chemistry))--University of Pretoria, 2023.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2024
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| _version_ | 1867613644979699712 |
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| access_status_str | Open Access |
| author2 | Nombona, Nolwazi |
| author_browse | Nombona, Nolwazi |
| author_facet | Nombona, Nolwazi |
| collection | Thesis |
| dc_rights_str_mv | © 2023 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Chemistry))--University of Pretoria, 2023. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/94229 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:26.088Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/94229 Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water Nombona, Nolwazi u15179941@tuks.co.za Berrange, Lu-Nita UCTD Porous organic polymers Fe3O4 nanoparticles Electrocatalysis Endocrine disrupting chemicals Sustainable Development Goals (SDGs) SDG-06: Clean water and sanitation Natural and agricultural science theses SDG-06 Dissertation (MSc (Chemistry))--University of Pretoria, 2023. Endocrine disrupting chemicals (EDCs) are commonly found in products such as pesticides, plastics, and pharmaceuticals. These chemicals are of significant concern due to their potential to disrupt the endocrine system, which plays essential roles in growth and reproduction. The detection of EDCs in water requires extensive equipment training and is expensive; therefore, it remains a significant challenge. Various catalysts such as multiwalled carbon nanotubes and graphene has been used as sensors to detect EDCs but porous organic polymers (POPs) and Porphyrin-based POPs (Py-POPs) have gained interest in electrochemical research owing to their porosity, stability, and tuneable structure. The structure of POPs depends on the synthetic method, the monomer used, and reaction conditions. Porphyrins are cyclic tetrapyrroles that consist of a conjugated π-electron system. Due to this conjugation, Py-POPs are stable structures that can coordinate metal ions. Metalated porphyrin-based POPs (MPy-POPs) are redox-active and chemically stable with improved electrochemical performance. In light of this, metalated porphyrin-based POPs (MPy-POPs) were used as sensing platforms for the detection of 2-phenylphenol, an endocrine disrupting chemical. Iron and zinc Py-POPs were synthesized and enriched with Fe3O4 nanoparticles to form nanocomposite materials. The morphological and structural characteristics of the composites were analysed using a variety of techniques, which includes ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), tunnel electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis. The synthesized composites had spherical morphology. The Fe3O4@MPy-POP catalysts were used for the electrocatalytic detection of 2-phenylphenol. Catalytic currents ranged between 24.7 µA and 41.5 µA, with peak potentials between 0.61 V and 0.65 V. The limit of detection ranged from 0.75 mM to 2.6 mM for the redox active catalysts. Real sample analysis using sunblock and apple peels were analyzed for the detection abilities of the synthesized catalysts. This study shows that these composites are promising materials for the detection endocrine disrupting chemicals in water. Chemistry MSc (Chemistry) Unrestricted Faculty of Natural and Agricultural Sciences SDG-06: Clean water and sanitation 2024-02-01T13:07:15Z 2024-02-01T13:07:15Z 2024-04 2023-11 Thesis * A2024 http://hdl.handle.net/2263/94229 10.25403/UPresearchdata.25108133 en © 2023 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Porous organic polymers Fe3O4 nanoparticles Electrocatalysis Endocrine disrupting chemicals Sustainable Development Goals (SDGs) SDG-06: Clean water and sanitation Natural and agricultural science theses SDG-06 Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title | Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title_full | Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title_fullStr | Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title_full_unstemmed | Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title_short | Porphyrin-based porous organic polymers enriched with Fe3O4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| title_sort | porphyrin based porous organic polymers enriched with fe3o4 nanoparticles as electrosensors for the detection of endocrine disrupting chemicals in water |
| topic | UCTD Porous organic polymers Fe3O4 nanoparticles Electrocatalysis Endocrine disrupting chemicals Sustainable Development Goals (SDGs) SDG-06: Clean water and sanitation Natural and agricultural science theses SDG-06 |
| url | http://hdl.handle.net/2263/94229 |