Pusat Pengajian Sains Kimia - Tesis

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    Transesterification Of Extracted Spent Bleached Earth (Sbe) Oil For Biodiesel Production Using Alkaline Supported Sbe Heterogenous Catalyst
    (2024-03)
    Keasavan, Thivya
    Proper disposal of spent bleaching earth (SBE) is much anticipated to create a circular economy. In this study, a two-pronged approach was employed to utilize SBE from palm oil refinery for its suitability to act as second-generation biofuel feedstock and catalyst.
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    Photocatalytic Removal Of Methylene Blue From Aqueous Solution By Ag And La Doped Tio2 And Zeolite Supported Tio2 Under Visible Light
    (2017-08)
    Us Saqib, Najm
    In the present study titanium dioxide (tio2) nanoparticles (nps) were modified via ag, la and ag-la doping using low cost and facile liquid impregnation (li) method, immobilization on zeolite, and at different calcination temperatures (500, 700 and 900 °c). The unsupported tio2 nps (tio2, ag/tio2, ag-la/tio2, and la/tio2) prepared at different calcination temperatures, showed dominant anatase phase (96 to 98 wt%), reduction of band gap energy from 3.2 to 2.88 ev, and phpzc between 6.2 to 7.3. The zeolite supported samples (z@tio2, z@ag/tio2, z@ag-la/tio2, and z@la/tio2) prepared at different calcination temperatures, showed the appearance of rutile and brookite phases which reached up to 20 wt% with the increase in calcination temperature, less reduction in band gap energy (3.11 to 2.90 ev) and higher ph/>zc values (7.1 to 7.8) as compared to the unsupported tio2 nps. The photocatalytic degradation of mb by unsupported and zeolite supported tio2 nps were performed under normal laboratory condition which is at ambient ph, room temperature (25±2 °c) and compact fluorescent light.
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    Development Of Extraction And Separation Techniques For The Determination Of Polycyclic Aromatic Hydrocarbons And Biogenic Amines In Food
    (2024-01)
    Hor, Jia Yi
    Polycyclic aromatic hydrocarbons (PAHs) and biogenic amines (BAs) are potential contaminants in various food products. Quantitative analysis of these contaminants in food is challenging due to their high physicochemical variability and complexity. This thesis describes the method developments for quantitative analysis of PAHs and BAs in selected food products.
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    Computational Design And Investigation Of New Benzophenones And Benzophenone Imines Inhibitors For Breast Cancer
    (2018-10)
    Shtaiwi, Amneh Mohammad
    The computational methods of protein-ligand interactions are core components in drug design and modem drug discovery. This study attempted to design and investigate the interactions of new human estrogen receptor (hERa) inhibitors to treat breast cancer cells using molecular modeling approach. The proposed inhibitors were designed by replacing the triarylethylene estrogenic scaffold found in the synthetic inhibitor 4-hydroxytamoxifen (4-0HT) with triarylimine Schiff bases.
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    Synthesis And Characterization Of Mil-101(Cr) And Zno@mil-101(Cr) For Photocatalytic Degradation Of Phenanthrene
    (2024-09)
    Adamu, Usman Abubakar
    In this study, a low-temperature hydrothermal method was employed to prepare highly porous and well-defined MIL-101(Cr) metal-organic frameworks. A series of chromium-based MOFs (MIL-101) was synthesized at different temperatures: 150, 160, 170, 180, 200, and 220 ºC. The synthesized MOFs were characterized using various techniques. The effectiveness of these synthesized photocatalysts was assessed for the photocatalytic degradation of phenanthrene (PHE) under UV light exposure. Remarkably, 98% degradation of PHE was obtained within 150 minutes of UV light irradiation with MIL-101@160 under specific optimized conditions, which included a PHE concentration of 2 ppm, pH 7, and a catalyst dosage of 30 mg. The enhanced degradation efficiency of MIL-101@160 could be attributed to its high specific surface area and thermal stability. ZnO was synthesized through a biosynthesis method and subsequently utilized to fabricate ZnO@MIL-101(Cr) nanocomposites, with preparation carried out at temperatures of 160 ºC and 220 ºC, respectively. These catalysts were characterized using fourier tranform infrared, X-ray diffraction, Scanning Electron Microscopy, X-ray Photoelectron Spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, and photoluminescence analyses, The effectiveness of the ZnO@MIL-101(Cr) nanocomposite in photocatalysis was evaluated for the degradation of PHE, utilizing both UV and visible light irradiation. The effect of different parameters such as solution pH, catalyst loading, the source of light, catalyst reusability, and the effect of temperature on PHE degradation were evaluated.