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https://ptsldigital.ukm.my/jspui/handle/123456789/500627Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Khoo Kok Siong, Prof. Madya Dr. | - |
| dc.contributor.author | Nurrul Assyikeen Md. Jaffary (P87577) | - |
| dc.date.accessioned | 2023-10-13T09:46:49Z | - |
| dc.date.available | 2023-10-13T09:46:49Z | - |
| dc.date.issued | 2022-12-05 | - |
| dc.identifier.other | ukmvital:130603 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/500627 | - |
| dc.description | Thorium-containing waste solutions can contaminate water sources and have a radioactive influence on the environment. The adsorption approach is commonly employed to remove Th4+ ions from aqueous solutions. The main objectives of this study are; i) to identify the means of release of thorium from raw monazite, ii) to develop natural rubber based adsorbent that capable to remove Th4+ ions from aqueous solution, and iii) identify the adsorption mechanism of Th4+ ions on the developed adsorbent. The characterization of Malaysian monazite and its processing residue, the hydroxide cake has been studied initially using hyper pure germanium detector (HPGe), X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR), and Wavelength Dispersive X-ray Fluorescence (WDXRF) analysis. The radioactivity of primordial radionuclides measured by gama-ray hyperpure germanium detector was found to be 28±1, 213±2, and 6±2 Bqg-1 for 226Ra, 232Th, and 40K, respectively, while for hydroxide cake, the values were 23±1, 343±2, and 20±5 Bqg-1 respectively. The bioadsorbent modified natural rubber (NR) was prepared by radiation-induced graft polymerization of glycidyl methacrylate (GMA) onto NR particle using gama irradiation at a dose of 5-100 kGy followed by subsequent chemical modification with phosphoric acid by ring-opening of epoxy. The natural rubber (NR), radiation-induced graft polymerization (NR-g-PGMA) and phosphorylation NR-g-PGMA, (NR-g-Ph) was characterized with Attenuated Total Reflectance-Fourier Transformed Infrared Spectroscopy (ATR- FTIR), 1H Nuclear Magnetic Resonance Spectroscopy (1H-NMR), Thermogravimetry Analyzer (TGA), and Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray (FESEM-EDX) to validate the characteristics of the finished product and to determine the modifications that occurred. The effects of pH, nitric acid concentration, contact time and initial metal ion concentration on Th4+ adsorption by the NR-g-Ph were investigated by batch technique. NR-g-Ph is found to be an efficient candidate for the removal of Th4+ ions from an aqueous 0.1 M to 0.0001 M in nitric acid media, and explained by the pH of the point of zero charge (PZC) of the adsorbent. The kinetic and isotherms adsorption model was used to explain the adsorption mechanism. The experimental data fit with the pseudosecond- order model compared to the pseudo-first-order model. At the same time, the observed equilibrium data are more consistent with Freundlich isotherm than the Langmuir isotherm. The NR-g-Ph then was applied for Th4+, UO22+ and REE adsorption from acidic monazite leach liquor. The NR-g-Ph performs well under competitive ion conditions, with 92.8% Th4+ adsorption. By adding a new step in the natural rubber transition, this study emphasizes the role of the NR to treat monazite leach liquor, demonstrating its selectivity among other rare earth ions and its viability as a biosorbent.,Ph.D | - |
| dc.language.iso | may | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Science and Technology / Fakulti Sains dan Teknologi | - |
| dc.rights | UKM | - |
| dc.subject | Monomers | - |
| dc.subject | Molecules | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.title | Modifikasi lateks getah asli melalui cantuman monomer glisidil metakrilat secara aruhan sinar gama sebagai penjerap ion torium | - |
| dc.type | Theses | - |
| dc.format.pages | 151 | - |
| dc.identifier.callno | TP247.N837 2022 tesis | - |
| dc.identifier.barcode | 006834(2022) | - |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi | |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_130603+SOURCE1+SOURCE1.0.PDF Restricted Access | 2.74 MB | Adobe PDF |  View/Open |
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