Mesoporous Materials Supported Vernonia Oil Esters and Their Immobilization With Silver Nanoparticles for Catalytic Applications
| dc.contributor.advisor | Chebude, Yonas (PhD) | |
| dc.contributor.advisor | Diaz, Isabel (Professor) | |
| dc.contributor.author | Gonfa, Gutta | |
| dc.date.accessioned | 2019-11-20T09:32:31Z | |
| dc.date.accessioned | 2023-11-09T16:18:31Z | |
| dc.date.available | 2019-11-20T09:32:31Z | |
| dc.date.available | 2023-11-09T16:18:31Z | |
| dc.date.issued | 2018-10-04 | |
| dc.description.abstract | In our world of rapidly increasing population and fast industrialization, design of value added and ecofriendly high performance organic–inorganic nanocomposites with higher stability for environmental remediation is becoming an active area of research in the field of inorganic material chemistry. The major objectives of this study are to design some typical surface hydrophobic ordered mesoporous nanocomposites by surface modification of their hydrophilic surfaces by supporting with native vernonia oil derivatives and immobilization by silver nanoparticles as potential heterogeneous catalyst for degradation of model organic dyes. In the first part of this work, vernonia oil with unique natural epoxy moiety was extracted from vernonia galamensis seed, which was purified and then derivatized to more active forms such as vernolic acid and vernolic acid mono alkyl esters like methyl, ethyl and propyl esters as well as their mercapto imidazole functionalized derivatives, i.e. methyl ester-IFVAME, ethyl ester-IFVAEE and propyl ester-IFVAPE. The presences of the functional groups were confirmed by FT-IR, 1H and 13C NMR spectroscopy and CHNS elemental analysis. In the second part of this work, vernolic acid methyl ester- VAME, and its mercapto imidazole functionalized (IFVAME) derivatives were supported on three types of ordered mesoporous nanomaterials with different surface properties and pore sizes: OMMs: Al-MCM-41 (Si/Al=3 & 15), SBA-15 & periodic mesoporous organo silica-PMO. The supported materials were studied by powder X ray diffraction, thermogravimetric analysis, FT-IR spectroscopy and nitrogen sorption isotherms. In the third part of this work, silver nanoparticles were synthesized on VAME and IFVAME supported Al-MCM-41, SBA-15, and PMO. The formations of the silver iv nanoparticles were confirmed from wide angle powder XRD and the final distribution of the metal nanoparticles were studied using Transmission Electron Microscopy. Finally, the potential catalytic applications of Ag-impregnated mOMMs were tested for degradation of model organic dyes (methyl orange and methylene blue) which was found to be promising. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/20153 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Mesoporous | en_US |
| dc.subject | Materials | en_US |
| dc.subject | Supported Vernonia | en_US |
| dc.subject | Oil Esters | en_US |
| dc.subject | Immobilization | en_US |
| dc.subject | Nanoparticles | en_US |
| dc.title | Mesoporous Materials Supported Vernonia Oil Esters and Their Immobilization With Silver Nanoparticles for Catalytic Applications | en_US |
| dc.type | Thesis | en_US |