Pusat Pengajian Sains Kimia - Tesis

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    Ferrite-Based Oxides: Preparation, Characterization And Carbon Dioxide Adsorption Study
    (2025-09)
    Sulaiman, Nur Izzana
    In response to the growing demand for effective carbon capture technologies, this study investigates the synthesis and characterization of ferrite–based oxides solid adsorbents prepared using a facile sol-gel method. The primary aim is to enhance the adsorption capacity, reusability and structural properties of the adsorbent. Besides, ternary and quaternary ferrite–based oxides have seen limited exploration in the field of carbon capture, largely due to the prevalence of studies focusing on simpler single metal oxides. These complex multi-metal systems offer the potential for enhanced CO2 adsorption properties yet remain underutilized. In this study, inverse spinel ferrite along with M-type and W-type hexaferrite adsorbents, were successfully synthesized using low-cost, facile and efficient method.
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    Development Of Polyvinyl Alcohol/ Microcrystalline Cellulose/ Anthocyanin Biofilm As Ph-Sensitive Indicator For Smart Packaging
    (2025-09)
    Mohd Nor Azam, Nur Adriana
    Recent studies have highlighted the negative environmental effects of petroleum-based plastics, emphasizing the increasing demand for biodegradable and smart food packaging materials. A sustainable and pH-sensitive food packaging film based on polyvinyl alcohol (PVA, 8%), microcrystalline cellulose (MCC, 2%), and anthocyanin (9% w/w) was developed using a solvent casting method in this study.
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    Bismuth Oxybromide-Based Composites Integrated Biochar From Palm Oil Mill Effluent Sludge For Photocatalytic Remediation Of Ciprofloxacin In Aqueous Medium
    (2025-09)
    Abdul-Raheem, Maryam Nike
    Bismuth oxybromide (BiOBr) is a promising semiconductor with a narrow band gap (~2.7–2.9 eV), making it an attractive photocatalyst for various applications. However, its practical use is limited by low surface area, high electron-hole recombination rate, restricted visible light absorption, and difficulty in reuse. This study addresses these issues by developing BiOBr-based composite systems with enhanced photocatalytic performance for the treatment of pharmaceutical wastewater, using ciprofloxacin (CIP) as a model contaminant. A sustainable BiOBr-biochar composite (BBC) was synthesized via a solvent-free hydrothermal method using biochar derived from palm oil mill effluent sludge (POMES) as a support matrix.
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    Kinetics Improvement Of Lithium Aluminium Hydride And 9- Ethylcarbazole Complex For Hydrogen Storage
    (2025-08)
    Liu, Huilin
    Hydrogen storage remains a critical bottleneck in the realization of a sustainable hydrogen economy. Lithium aluminum hydride (LiAlH4) and 9- ethylcarbazole (NCZ) are two promising hydrogen storage materials due to their high theoretical hydrogen capacities. However, their practical applications are limited by the poor reversibility of LiAlH4 and the sluggish (de)hydrogenation kinetics of NCZ. In this work, a novel composite system composed of LiAlH4 and NCZ in a 1:1 molar ratio (denoted as LA–NCZ) was synthesized and investigated. The composite exhibited a synergistic enhancement in hydrogen storage behavior: NCZ significantly reduced the dehydrogenation temperature of LiAlH4, enabling rapid dehydrogenation in a narrow temperature window between 150 °C and 160 °C. Differential scanning calorimetry (DSC) revealed dehydrogenation peaks at lower temperatures compared to pristine LiAlH4, and Kissinger analysis yielded significantly reduced apparent activation energies of 36.76 ± 1.33 kJ/mol and 83.11 ± 2.87 kJ/mol for the first and second steps, respectively. Interestingly, the dehydrogenation products of LiAlH4 (LiH and Al) further promoted the hydrogenation rate and selectivity of NCZ, achieving a hydrogen uptake of 5.6 wt% under 90 °C and 70 bar H2 with 5 wt% Ru catalyst, close to the theoretical value of fully hydrogenated NCZ.
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    Catalytic Dehydrogenation Of Hydrazine Borane Over Cu@Ni/Moo3 Core Shell Catalyst For Hydrogen Storage Application
    (2025-08)
    Lei, Yunfeng
    Hydrogen energy is a promising clean energy source, and efficient hydrogen storage remains a critical challenge. Hydrazine borane (N2H4BH3, HB), with a high hydrogen content of 15.4 wt%, has attracted attention as a potential chemical hydrogen storage material. However, conventional methanolysis reactions typically utilize only the BH3 moiety, limiting hydrogen release. In this study, we developed a highly efficient MoO3-supported copper–nickel core–shell catalyst (Cu@Ni/MoO3) to enable complete hydrogen release from both the BH3 and N2H4 moieties. At 50 °C, the system achieved a yield of 5.5 moles of gas, the highest reported for HB methanolysis under mild conditions. Kinetic studies showed a low activation energy of 36.5 ± 3.5 kJ/mol for the second dehydrogenation step, indicating rapid hydrogen evolution at relatively low temperatures.