Umi Fazara Md Ali
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Umi Fazara Md Ali
Official Name
Umi Fazara, Md Ali
Alternative Name
Ali, Umi Fazara Md
Md. Ali, Umi Fazara
Umi Fazara, M. A.
Main Affiliation
Scopus Author ID
57195513638
Researcher ID
AAU-4840-2020

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  • Publication
    Sulfur dioxide removal by calcium-modified fibrous KCC-1 mesoporous silica: kinetics, thermodynamics, isotherm and mass transfer mechanism
    ( 2022-04-01)
    Hanif M.A.
    ;
    Naimah Ibrahim
    ;
    Khairuddin Md Isa
    ;
    Umi Fazara Md Ali
    ;
    Tuan Abdullah T.A.
    ;
    Jalil A.A.
    The removal of sulfur dioxide from industrial flue gas through dry flue gas desulfurization method commonly involves the use of adsorption process with porous sorbent. The efficiency of this process is highly dependent on the adsorption capacity and the adsorption rate of SO2 onto the sorbent materials. The use of KCC-1 mesoporous silica modified with calcium metal additives (Ca/KCC-1) in SO2 adsorption is examined in a fixed bed reactor system. The adsorption capacity of Ca/KCC-1 is found to be critically governed by the reaction temperature and inlet SO2 concentration where low values of both parameters are favorable to achieve the highest adsorption capacity of 3241.94 mg SO2/g sorbent. SO2 molecules are adsorbed on the surface of Ca/KCC-1 by both physisorption and chemisorption processes as assumed by the Avrami kinetic model. Thermodynamic study shows that the process is exothermic and spontaneous in nature, and changes from an ordered stage on the surface of KCC-1 towards an increasingly random stage. The process is well explained by Freundlich isotherm model indicating a slightly heterogeneous process and moderate adsorption capacity. The adsorption stage is limited by film diffusion at the initial stage and by intraparticle diffusion during the transfer of SO2 into the network of pores before adsorption takes place on the active sites.
  • Publication
    Adsorption of carbon dioxide (CO2) by activated carbon derived from waste coffee grounds
    ( 2021-05-24)
    Lim H.K.
    ;
    Umi Fazara Md Ali
    ;
    Razi Ahmad
    ;
    Aroua M.K.
    Currently, three are several agricultural bio-based materials have been successfully utilized as gas adsorbents. In this study, waste coffee grounds (WCGs) have been selected as a potential precursor of Carbon Dioxide (CO2) adsorbents. The preparation parameters for activated carbon derived from WCGs were optimized using Response Surface Methodology (RSM). The optimized preparation parameters were found to be 1:3.67 impregnation ratio of acid, 533oC of carbonization temperature and 1.13 hours of activation time, which resulted in 23.6 wt% of yield. The physical and chemical characteristics of WCGAC in terms of surface morphology, carbon content, ash content and yield were also investigated. The CO2 breakthrough time using WCGAC were carried out at the temperatures of 30, 40, and 60°C. It was found that WCGAC shows a longer CO2 breakthrough times (5 mins) and a higher adsorption capacity (4.33 mg CO2/g adsorbent) at 30oC.
  • Publication
    Oil palm waste-derived reduced graphene oxide (rGO) for dynamic adsorption of dye in a fixed-bed system
    ( 2024-01-01)
    Mohd Ali Jinnah S.N.H.
    ;
    Umi Fazara Md Ali
    ;
    Subash Chandra Bose Gopinath
    ;
    Naimah Ibrahim
    ;
    Razi Ahmad
    ;
    Mohamed Zuki F.
    This study focuses on investigating the dynamic adsorption of Rhodamine B (RhB) from reduced graphene oxide (rGO) derived from oil palm waste. The synthesis of rGO from palm kernel shell (PKS) was achieved through double oxidation and carbonization method, resulting in a yield of 73.5 wt%. The reduction of oxygen-containing functionalities process using PKS was confirmed by FTIR spectroscopy, microscopic evaluation, and X-ray diffraction analyses. Laboratory-scale fixed-bed experiments were conducted with various process parameters. Both PKS and rGO were used as adsorbents, and a comparison was made based on breakthrough curve analysis, adsorption capacity and percentage removal of dye. The adsorption kinetics of RhB on PKS and rGO were best described by the non-linear Yoon-Nelson model, with a high adsorption capacity of 88.32 mg/g and 195.24 mg/g respectively. Using both PKS and rGO, the maximum adsorption capacity was observed when using 10 cm bed depth column, inlet dye concentration of 5 mg/L, flow rate of 12 mL/min and pH of 7. PKS exhibited good dye removal with an efficiency of 66.54%. Meanwhile, the exothermic behavior highlighted the potential of utilizing rGO for maximum dye removal, achieving an efficiency of 90.35%. This study justifies rGO as a cost-effective superior dye removal adsorbent, providing new prospect for large-scale dye removal.
  • Publication
    Enhancement of microplastics and nanoplastics removal via filtration method using surface-engineered palm kernel shell biochar
    (Elsevier B.V, 2025-07)
    Muhammad Adli Hanif
    ;
    Naimah Ibrahim
    ;
    Nur Adlyna Hayazi
    ;
    Farrah Aini Dahalan
    ;
    Aishah Abdul Jalil
    ;
    Achmad Syafiuddin
    ;
    Umi Fazara Md Ali
    Microplastics (MP) and nanoplastics (NP) are major aquatic contaminants, raising concerns due to their strong affinity for other toxic substances. Filtration is widely employed for MP and NP removal due to its simplicity, efficiency and variety of available filtration media. In this study, the removal efficiency of MP and NP was investigated using surface-engineered biochar of palm kernel shell (PKS) origin, modified with cetyltrimethylammonium bromide (CTAB). The modified biochar demonstrated performance superior to the unmodified biochar, achieving 95.71 % and 96.12 % polyethylene MP (2–4 μm) removal efficiency as measured by turbidity and gravimetric methods, respectively, at an optimal CTAB concentration of 1.5CMC. The optimized biochar (PKS-1.5CMC) also improved the removal efficiencies for a range of other MP and NP particles varying in size (159 nm–48 μm), shape (irregular, spherical, fibrous) and polymer type (polyethylene, polyamide). The modification with CTAB increased the biochar's surface positive charge and hydrophobicity, resulting in stronger electrostatic attraction and hydrophobic interactions with MP and NP particles, which are negatively charged and hydrophobic by nature. In terms of MP and NP properties, higher removal efficiencies were obtained for (i) larger MPs due to easier retention, (ii) NPs due to their tendency to agglomerate, resulting in larger particle size, (iii) irregularly shaped particles, because of their surface roughness, providing more attachment sites and (iv) polyethylene MPs and NPs, owing to their higher hydrophobicity and lower negative zeta potential. Significant formation of a cake layer observed on the upper surface of the filter media suggested that filtration, rather than adsorption, was the dominant mechanism for the removal of MP and NP by biochar.
  • Publication
    Sulfur dioxide removal using deep eutectic solvent–functionalized palm kernel shell–activated carbon
    (Springer, 2025-02)
    Wan Nur Amanna Wan Nuzi
    ;
    Muhammad Adli Hanif
    ;
    Naimah Ibrahim
    ;
    Farrah Aini Dahalan
    ;
    Nabilah Aminah Lutpi
    ;
    Masitah Hasan
    ;
    Raja Nazrul Hakim Raja Nazri
    ;
    Umi Fazara Md Ali
    The release of SOâ‚‚ into the atmosphere is concerning due to its role in acidification, which threatens living organisms and the environment. Adsorption processes using materials like chemically modified activated carbon (AC) have demonstrated strong potential for removing SOâ‚‚ before its release. This study evaluates the performance of AC derived from palm kernel shells, and AC functionalized with choline chloride-glycerol, a deep eutectic solvent (DES) (AC-DES), in removing SOâ‚‚ through breakthrough experiments conducted in a fixed bed reactor. AC and AC-DES achieved SOâ‚‚ adsorption capacities of 0.522 and 2.763 mg SOâ‚‚/g adsorbent, respectively. Characterization of the adsorbents indicated that DES functionalization significantly increased the number of active sites for SOâ‚‚ adsorption, leading to superior adsorption performance of AC-DES. The optimization of process parameters identified 40 Â°C and 1500 ppm inlet SOâ‚‚ concentration as the ideal conditions for optimal SOâ‚‚ adsorption. Experimental data fitted with three adsorption kinetic and isotherm models indicated that SOâ‚‚ adsorption onto AC-DES is best described by the Avrami kinetic model and the Sips isotherm model. Thermodynamics studies revealed that the process is exothermic, thermodynamically non-spontaneous, and goes from a random state to an ordered one. The findings suggest that SOâ‚‚ adsorption onto AC-DES follows a complex mixed mechanism involving both physisorption and chemisorption, with surface heterogeneity and adsorbate-adsorbent interactions playing a critical role in controlling the adsorption process.
  • Publication
    Bio-removal of lead (II) ions under optimal condition by zinc chloride-impregnated activated carbon from brown alga
    ( 2024-01-01)
    Osman N.S.
    ;
    Umi Fazara Md Ali
    ;
    Subash Chandra Bose Gopinath
    ;
    Hussin F.
    ;
    Aroua M.K.
    Sargassum sp., a brown alga in the division of macroalgae was evaluated for its ability to synthesis macroalgal-based activated carbon and remove lead (II) ions from synthetic aqueous solution. The sargassum activated carbon (SAC) was prepared by chemical activation impregnated with zinc chloride followed by carbonization. The surface morphology and functional group of untreated Sargassum sp. powder (SAP) and activated Sargassum sp. carbon (SAC) were scanned and presented with the Scanning Electron Microscope (SEM) and Fourier Transform Infrared spectroscopy (FTIR). Batch studies were conducted to explore maximum removal efficiency in term of pH, initial lead (II) ions concentration, contact time, adsorbent dosage, and temperature for the efficient adsorption. The maximum lead (II) ions uptake capacity for SAC was obtained at pH 5, initial lead (II) ions concentration at 25 mg/L, operation time of 60 min, adsorbent dosage of 0.1 g and temperature of 40 °C. The adsorption data were well-fitted by the Freundlich isotherm model, with an R2 value of 1.000, indicating a good fit. The kinetic study revealed that the adsorption of lead (II) ions followed a pseudo-first-order kinetic model, with an R2 value of 0.9746. This study validates the use of brown algae in the treatment of heavy metal contamination in wastewater.
      18  3
  • Publication
    Production of fuel grade anhydrous ethanol: A review
    ( 2021-05-24)
    Lee Y.H.
    ;
    Chen C.H.
    ;
    Umi Fazara Md Ali
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    Alcoholic fermentation of fermentable carbon sources like molasses and table sugar using yeast are typical route in producing alcohol particularly known as bioethanol (C2H5OH). The key challenge encountered in bioethanol production process is to eliminate the impurity presence within the bioethanol which mainly water. Distillation is an energy extensive process which commonly used to recover ethanol up to 95% purity due to the presence of azeotropic composition. The distillation will no longer appropriate for further purification once the azeotrope composition has reached. Nonetheless, to be able to use as a viable fuel for gasoline engine or for any other utilizations where the purity is a major concern, further dehydration steps are needed producing an absolute ethanol. Few studies have been investigated on various dehydration methods for producing anhydrous ethanol, including azeotropic distillation, extractive distillation, adsorption, membrane pervaporation, and solvent extraction process. This review offers an insight into currently used technology on the ethanol dehydration methods and the future prospect on the continuous improvement particularly on the process energy requirement and efficiency will be discussed.
      2
  • Publication
    Microplastics and nanoplastics: Recent literature studies and patents on their removal from aqueous environment
    ( 2022-03-01)
    Hanif M.A.
    ;
    Naimah Ibrahim
    ;
    Farrah Aini Dahalan
    ;
    Umi Fazara Md Ali
    ;
    Masitah Hasan
    ;
    Jalil A.A.
    The presence of microplastics (MP) and nanoplastics (NP) in the environment poses significant hazards towards microorganisms, humans, animals and plants. This paper is focused on recent literature studies and patents discussing the removal process of these plastic pollutants. Microplastics and nanoplastics can be quantified by counting, weighing, absorbance and turbidity and can be further analyzed using scanning electron microscopy (SEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, surface-enhanced Raman spectroscopy and Raman tweezers. Mitigation methods reported are categorized depending on the removal characteristics: (i) Filtration and separation method: Filtration and separation, electrospun nanofiber membrane, constructed wetlands; (ii) Capture and surface attachment method: coagulation, flocculation and sedimentation (CFS), electrocoagulation, adsorption, magnetization, micromachines, superhydrophobic materials and microorganism aggregation; and (iii) Degradation method: photocatalytic degradation, microorganism degradation and thermal degradation; where removal efficiency between 58 and 100% were reported. As these methods are significantly distinctive, the parameters which affect the MP/NP removal performance e.g., pH, type of plastics, presence of interfering chemicals or ions, surface charges etc. are also discussed. 42 granted international patents related to microplastics and nanoplastics removal are also reviewed where the majority of these patents are focused on separation or filtration devices. These devices are efficient for microplastics up to 20 μm but may be ineffective for nanoplastics or fibrous plastics. Several patents were found to focus on methods similar to literature studies e.g., magnetization, CFS, biofilm and microorganism aggregation; with the addition of another method: thermal degradation.
      36  2
  • Publication
    Comprehensive study on social, compositional and thermal aspects of household solid waste for waste-to-energy potential estimation in Tashkent city
    ( 2024-12-01)
    Tursunov O.
    ;
    Karimov I.
    ;
    Åšpiewak K.
    ;
    Hu X.
    ;
    Zhou Y.
    ;
    Kustov A.
    ;
    Umi Fazara Md Ali
    ;
    Uvarov R.
    The management of household solid waste (HSW) has emerged as a key issue in developing nations. A critical analysis of the physical and chemical components of MSW management and infrastructure is necessary to address current socioeconomic issues. According to the World Bank projections, the annual global generation of solid waste from municipalities is expected to reach 2.59 billion tons by 2030 and and 3.40 billion tonnes by 2050. Inadequate handling of waste products frequently results in harm to the environment, the spread of diseases, and the generation of greenhouse gases, all of which have contributed to climate change and global warming. The waste-to-energy (WtE) strategy, which drastically reduces waste volume and produces renewable energy, has been adopted by a number of countries to address these issues. In this study, the social, compositional, and thermal aspects of household solid waste in a typical Tashkent District were studied. A Social survey was conducted to investigate residents’ behavior towards waste sorting. The survey was conducted in the Uchtepa district of Tashkent, Uzbekistan. The composition of household solid waste was studied to explore the fractional distribution of the waste in the area. The American Society for Testing and Materials (5231–92) and European PN-EN standards were used for sampling, sorting, and for the rest of the analyses. Subsequently, proximate and ultimate analyses were performed to better understand combustion properties. A high heating value was identified to estimate the energy generation potential of household solid waste. Social survey results showed that the waste generated in the apartments will be discarded either on the day of its generation or the maximum after three days. Overall, 52 % of the respondents chose to sort their waste, compared to 48 % who had no real desire to separate their household solid waste. Food waste, plastics, and paper constituted 70 % of the total waste generated in the district. The mixed waste sample had a high heating value of 23.87 Mj/kg. The analysis revealed an energetic potential of HSW generated from the landfill as thermal energy.
      2  8
  • Publication
    Comparative Performance of Catalytic and Non-Catalytic Pyrolysis of Sugarcane Bagasse in Catatest Reactor System
    ( 2020-04-30)
    Faraheen Kabir Ahmad S.
    ;
    Umi Fazara Md Ali
    ;
    Khairuddin Md Isa
    ;
    Alina Rahayu Mohamed
    ;
    Sataimurthi O.
    Catalytic pyrolysis is a favourable process used to enhance the quality of bio-oil. Based on reviews from previous research there are only scarce of studies on the comparison of catalytic and non-catalytic pyrolysis of biomass such as rice husk, olive husk and corncob. In this study, sugarcane bagasse was selected as it has not been explored much yet. The target of this research is to compare the impact of catalytic and non-catalytic pyrolysis of sugarcane bagasse in terms of the yield, properties, and also the compositions of bio-oil. Catalytic and non-catalytic pyrolysis was executed in catatest bed reactor at temperatures 400°C to 550°C with the aids of ZSM-5 zeolite catalyst. Bio-oil from catalytic and no-catalytic pyrolysis which gives the maximum yield was used to be studied further in terms of the properties and chemical compositions. The result shows that the maximum yield of bio-oil was accomplished from catalytic pyrolysis at temperature 500°C which was 21.4%. The properties and composition of bio-oil from catalytic pyrolysis shows better result compare to non-catalytic pyrolysis.
      2  12