Khairuddin Md Isa
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Preferred name
Khairuddin Md Isa
Official Name
Md Isa, Khairuddin
Alternative Name
Isa, K. Md
Md Isa, Khairuddin
Md. Isa, Khairuddin
Isa, K. M.
Main Affiliation
Scopus Author ID
36188321600
Researcher ID
Y-7078-2019

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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
    Evaluation of phenol formaldehyde resin synthesized from sugarcane bagasse bio-oil under optimized parameters
    ( 2022-04-01)
    Ahmad S.F.K.
    ;
    Umi Fazara Md Ali
    ;
    Khairuddin Md Isa
    ;
    Subash Chandra Bose Gopinath
    Bio-oil from biomass is considered as a potential substitute to partially replace phenol in the preparation of phenol formaldehyde resin as replacement to the commercial phenol which high in cost. However, the percentages of bio-oil substitutions need to be determined to ensure that the performance is good as the commercial ones. The aim of this research is to identify the optimum conditions for synthesizing phenol formaldehyde resin (PF) and determines the percentages of bio-oil substitutions by manipulating the synthesizing variables such as formaldehyde to phenol (F/P) catalyst ratio (NaOH/P), catalyst ratio and duration using one-factor-at-time method. The effect of each manipulated variables on shear strength was compared to the Chinese National Standard for PF resin shear strength. Bio-based phenolic resins are synthesized using the optimum conditions by replacing 10, 20, 30 and 40% of phenol with bio-oil from the pyrolysis of sugarcane bagasse. The results obtained shown that the optimum conditions to synthesize phenol formaldehyde resin is at F/P molar ratio of 2.0, catalyst ratio of 0.6 and duration of 3 hour. The results of bio-based phenolic resins bonding performance shows that substitution percentage of bio-oil up to 20% at most gives good performance compared to the pure PF resin.
  • Publication
    Innovative formulation and characterisation of grease made from waste engine oil
    (UPM Press, 2023)
    Muhammad Auni Hairunnaja
    ;
    Mohd Aizudin Abd Aziz
    ;
    Nurul Waheeda Abdu Rahman
    ;
    Mohd Azmir Arifin
    ;
    Khairuddin Md Isa
    ;
    Umi Fazara Md Ali
    Lubricating grease is usually produced from mineral oil, making the relationship between grease and mineral oil unavoidable. Formulation of grease from waste oil can reduce the dependency of the grease industry on mineral oil as well as help to reduce the waste generation of used oil. This study aims to produce fumed silica (FS) grease from waste engine oil (WEO) and analyse the properties of the formulated grease. The method started with treating WEO to remove any contaminants in the used oil. After that, the greases are produced using a weight percentage ratio before being examined for consistency, oil separation, oil bleeding, FTIR (Fourier transform infrared spectroscopy) analysis, and corrosiveness. In terms of uniformity, oil separation, and oil bleeding, WEO percentage content had a substantial impact on the findings. The FTIR demonstrated that synthetic greases had the same spectra when evaluated between 500 cm-1 and 4000 cm-1. The grease's corrosiveness is low, as determined by class 1 corrosiveness toward the copper strip. However, the grease properties differ when consistency, oil bleeding and oil separation test is done. Higher oil content in grease produced high oil bleeding and separation but low consistency. As a conclusion of the results, fumed silica grease with oil percentages of 83 and 82 have the most grease-like features, showing that the grease fits the traits' requirements. Based on the investigation's findings, it was established that WEO may be used as a base oil in grease formulation and that the grease's properties are satisfactory.
  • Publication
    Optimization of hydrogen production from steam reforming of biomass tar over Ni/dolomite/La₂O₃ catalysts
    (Elsevier, 2020)
    Ru Shien Tan
    ;
    Tuan Amran Tuan Abdullah
    ;
    Aishah Abdul Jalil
    ;
    Khairuddin Md Isa
    Industrially, the endothermic process of steam reforming is carried out at the lowest temperature, steam to carbon (S/C) ratio, and gas hourly space velocity (GHSV) for maximum hydrogen (H2) production. In this study, a three-level three factorial Box-Behnken Design (BBD) of Response Surface Methodology (RSM) was applied to investigate the optimization of H2 production from steam reforming of gasified biomass tar over Ni/dolomite/La₂O₃ (NiDLa) catalysts. Consequently, reduced quadratic regression models were developed to fit the experimental data adequately. The effects of the independent variables (temperature, S/C ratio, and GHSV) on the responses (carbon conversion to gas and H2 yield) were examined. The results indicated that reaction temperature was the most significant factor affecting both responses. Ultimately, the optimum conditions predicted by RSM were 775 °C, S/C molar ratio of 1.02, and GHSV of 14,648 h−1, resulting in 99 mol% of carbon conversion to gas and 82 mol% of H2 yield.
  • Publication
    Application of Mesoporous Silica as Catalyst Support in Sulfur Dioxide Removal: Metal and Amine Sorbent Modifications
    ( 2020-07-09)
    Adli Hanif M.
    ;
    Naimah Ibrahim
    ;
    Khairuddin Md Isa
    ;
    Abdul Jalil A.
    Emission of hazardous SO2 into the atmosphere due to the burning of fossil fuels in various industries is detrimental not only to the environment but also to human beings. Various mitigation techniques have been implemented to overcome this problem, with flue gas desulfurization (FGD) method being the most commonly used. Dry FGD does not typically perform as good as wet method and requires new type of sorbent to be tested. Mesoporous silica (MS), a sorbent with porosity in the range of 2-50 nm is considered as attractive alternative due to its high specific surface area, ordered pore structures and wide array of morphologies. Due to relatively weak interaction between MS and SO2 adsorbate during dry FGD process, additives are introduced to overcome this problem. These MS are modified with basic additives which are deemed more favorable for SO2 adsorption. Metal and amine-based additives are commonly employed where the latter are reported to obtain higher adsorption capacity. Increasing additive loading is beneficial up to an optimal value depending on the types of additives.
      10  21
  • Publication
    Chemically modified sugarcane bagasse as a potentially low-cost biosorbent for dye removal
    ( 2010)
    Saiful Azhar Saad
    ;
    Khairuddin Md Isa
    ;
    Rohazita Bahari
    The use of adsorbent prepared from sugarcane bagasse, an agro waste from sugar industries has been studied as an alternative substitute for activated carbon for the removal of dyes from wastewater. Adsorbents prepared from sugarcane bagasse were successfully used to remove the methyl red (MR) from an aqueous solution in a batch reactor. This study investigates the potential use of sugarcane bagasse, pretreated with phosphoric acid (SBC), for the removal of methyl red from simulated wastewater. Phosphoric acid treated sugarcane bagasse was used to adsorb methyl red at varying dye concentration, adsorbent dosage, pH and contact time. A similar experiment was conducted with commercially available powdered activated carbon (PAC) and untreated sugarcane bagasse (SB) in order to evaluate the performance of SBC. The adsorption efficiency of different adsorbents was in the order PAC > SBC > SB. The initial pH 3 to 6 favoured the adsorption of synthetic dyes by both SBC and SB. This prepared adsorbent was very efficient in decolorized diluted solution. It is proposed that SBC, in a batch or stirred tank reactors could be employed as a low-cost alternative in wastewater treatment for dyes removal.
      12  12
  • 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  6
  • Publication
    Introduction to Environmental Engineering
    (Penerbit Universiti Malaysia Perlis, 2009)
    Norazian Mohamed Noor
    ;
    Kamarudin Mohd Nor
    ;
    Saiful Azhar Saad
    ;
    Ragunathan Al Santiagoo
    ;
    Ain Nihla Kamarudzaman
    ;
    Khairuddin Md Isa
    This book is intended as an introductory course to Environmental Engineering for the first year university students. It touches on the principles underlying the knowledge and practice of Environmental Engineering. This book contains five (5) chapters. It sets to guide students on the majoe elements in this branch of engineering. These elements form the foundation upon which students will be later exposed to a deeper understanding of the knowledge and practices of environmental decision making and management enshined in various advanced courses that they will have to go through as they proceed to year two, three and four. The first chapter gives an overview on the definition of the environment and its associated issues. It also discusses briefly on noise pollution. This topic will be further discussed sufficiently in noise pollution and vibration control, a course offered at the third year level. This third chapter deals with the subject on hazardous wastes, and how they are managed. Students will find it useful when they follow an ensuing solid and hazardous waste management, a second year course dedicated to this subject. The fourth chapter provides as overview on air pollution and it will be covered in sufficient details when the students are in their third year. Last but not least, students will be introduced to water pollution in chapter five. This topic is a prerequisite to wastewater engineering. All topics in these chapters are discussed with examples, and selected solutions to the given problems, with emphasizing on relevant scientific principle. They are also discussed in the light of their related legislation. It is hoped that the students will understand reasonably well on the principles of environmental engineering, and are better prepared to follow other pertinent course later.
      8  1
  • Publication
    Comparative Study of Sulfur Dioxide Removal Using Mesoporous Silica KCC-1 and SBA-15
    ( 2022-01-01)
    Muhammad Adli Hanif
    ;
    Naimah Ibrahim
    ;
    Khairuddin Md Isa
    ;
    Masitah Hasan
    ;
    Tuan Abdullah T.A.
    ;
    Jalil A.A.
    Sulfur dioxide (SO2) emitted into the atmosphere by fossil fuel burning in the industries posed significant negative effects on humans and the environment. SO2 removal performance of two mesoporous silica: KCC-1 and SBA-15, are compared through breakthrough experiments on a lab-scale fixed bed reactor. The mesoporous silicas were characterized via nitrogen (N2) adsorption-desorption isotherm and field emission scanning electron microscopy (FESEM). KCC-1 demonstrates characteristics of capillary condensation and non-uniform slit-shaped pores while SBA-15 displays characteristic of a narrow range of mesopores with minimal network effects. Surface area, total pore volume and average pore diameter of KCC-1 are significantly greater than SBA-15 due to the presence of dendrimeric fibrous morphology. Under tested conditions, SO2 adsorption capacities of KCC-1 and SBA-15 are 614.01 mg/g and 274.64 mg/g, respectively. Superior performance by KCC-1 can be attributed to better accessibility of SO2 towards the active sites due to higher surface area provided by the dendrimer fibers.
      1
  • Publication
    The Grease Formulation Using Waste Substances from Palm Oil Refinery and Other Industrial Wastes: A Review
    ( 2023-08-01)
    Hairunnaja M.A.
    ;
    Aziz M.A.A.
    ;
    Bashari N.A.F.
    ;
    Arifin M.A.
    ;
    Nedumaran N.
    ;
    Khairuddin Md Isa
    ;
    Umi Fazara Md Ali
    Many applications use Spent Bleaching Earth (SBE) despite being considered hazardous waste from the palm oil refinery process. Its production increases yearly, similar to waste cooking oil (WCO). The SBE is known as a thickener in grease formulation. The same goes for red gypsum, waste motor oil, stearic acid, and lithium hydroxide monohydrate. They are all considered thickeners but have different durability in protecting base oil in grease. Then, previous studies revealed their performances with side effects detection against the environment and human bodies. Cooking oil is a heat transfer medium for serving foods with higher amounts of unsaturated fatty acids. The number of fatty acids might change after cooking oil consumption and become highly demanded due to the chemical properties of density, viscosity and fatty acids. Nowadays, people lack awareness of the importance of recycling palm oil waste. They intend to dispose of it instead of recycling it for sustainable energy resources. Therefore, this paper will discuss the grease formulation, contaminant available in WCO, its treatment, issues regarding different thickener consumption, treatment against Spent Bleaching Earth (SBE), and propose the safe thickener and additives for future intakes. This study found that adding Fume Silica (F.S.) as a thickener and Molybdenum Disulfide (MoS2) enhanced the grease stability. Further treatment against SBE (remove residue oil) and WCO (metal elements, undesired impurities and water content) is necessary for providing good quality formulated grease.
      3  22