Ku Syahidah Ku Ismail
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Ku Syahidah Ku Ismail
Official Name
Ku Ismail, Ku Syahidah
Alternative Name
Ku Ismail, Ku Syahidah
Ismail, K. S.Ku
Ismail, K. S.K.
Main Affiliation
Scopus Author ID
8932508300
Researcher ID
AAA-2532-2019

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  • Publication
    Effect of Microwave-Assisted COâ‚‚ Pyrolysis on the production of activated carbon from confiscated cigarettes
    ( 2023-07)
    Lee Jian Wei
    ;
    Ku Syahidah Ku Ismail
    ;
    Mohamad Firdaus Mohamad Yusop
    ;
    Mohd Azmier Ahmad
    Confiscated cigarettes are a significant problem worldwide, and in Malaysia, the Royal Malaysian Customs Department (RMCD) Perlis had confiscated 1.5 billion sticks of cigarettes from 2016 to 2019 and the cost of disposal reached RM1.2 billion. Confiscated cigarettes are commonly disposed by incineration which can cause environmental pollution. In this study, the cigarette tobacco was converted into activated carbon (AC) via microwave-assisted CO₂ pyrolysis. The tobacco was first carbonized at 300°C, followed by carbon dioxide (CO₂) activation under microwave heating. The highest yield, 31% was obtained at 616W for 6 min. The BET surface area for tobacco, char and the best AC produced were 1.99, 1.21 and 1.69 m2/g, respectively. Response surface methodology (RSM) of dye removal from AC showed that the optimum condition with the best adsorption properties was achieved at 364 Watt for 2 minutes, which resulted in 87.4% removal of methylene blue (MB). Due to the low surface area, the capability of the AC to adsorb MB dye might be assisted by a diversified factors that contributes to the adsorption mechanism. Modelling of the adsorption data also showed that the adsorption process occurs in multilayers of the adsorbent, best fit to the Freundlich isotherm. Microwave-assisted CO2pyrolysis shows potential in the production of AC from tobacco and could be further improved to increase the surface area.
      1  39
  • Publication
    Effect of microwave-assisted COâ‚‚ pyrolysis on the production of activated carbon from confiscated cigarettes
    ( 2023-07)
    Lee Jian Wei
    ;
    Ku Syahidah Ku Ismail
    ;
    Mohamad Firdaus Mohamad Yusop
    ;
    Mohd Azmier Ahmad
    Confiscated cigarettes are a significant problem worldwide, and in Malaysia, the Royal Malaysian Customs Department (RMCD) Perlis had confiscated 1.5 billion sticks of cigarettes from 2016 to 2019 and the cost of disposal reached RM1.2 billion. Confiscated cigarettes are commonly disposed by incineration which can cause environmental pollution. In this study, the cigarette tobacco was converted into activated carbon (AC) via microwave-assisted CO₂ pyrolysis. The tobacco was first carbonized at 300℃, followed by carbon dioxide (CO₂) activation under microwave heating. The highest yield, 31% was obtained at 616W for 6 min. The BET surface area for tobacco, char and the best AC produced were 1.99, 1.21 and 1.69 m2/g, respectively. Response surface methodology (RSM) of dye removal from AC showed that the optimum condition with the best adsorption properties was achieved at 364 Watt for 2 minutes, which resulted in 87.4% removal of methylene blue (MB). Due to the low surface area, the capability of the AC to adsorb MB dye might be assisted by a diversified factors that contributes to the adsorption mechanism. Modelling of the adsorption data also showed that the adsorption process occurs in multilayers of the adsorbent, best fit to the Freundlich isotherm. Microwaveassisted CO₂ pyrolysis shows potential in the production of AC from tobacco and could be further improved to increase the surface area.
      4  22
  • Publication
    Structural and mechanical variations of major ampullate silk spun by Malaysian Nephila pilipes spider
    (Springer, 2023)
    Nurul Ain Harmiza Abdullah
    ;
    Ku Syahidah Ku Ismail
    ;
    Khadijah Hanim Abdul Rahman
    ;
    Saiful Bahari Bakarudin
    ;
    Johan Ariff Mohtar
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Boon Yin Khoo
    Major ampullate (MA) silk is a natural biomaterial, spun by spiders with exceptional mechanical characteristics. Most researchers who studied MA silk structure were primarily interested in the properties of a dragline thread that protrudes from the spider’s spigot when being chased by its predator. Apart from the dragline, the MA silk fibers may also be found in three pivot threads of the orb web known as the mooring, framework, and radial. However, it is currently uncertain whether the MA silk in these threads has properties similar to the dragline thread. Thus, this work attempted to compare the properties of MA silk fiber in the mooring, framework, radial, as well as the dragline threads. The MA silk fibers in mooring thread were found to exhibit significant quantity of MA fibers (12 ± 5.0 fibers per thread), thickness diameter (11.7 ± 0.6 μm), and supercontraction effect (high swelling ratio of 18.6), with an outstanding combination of strength (4464 MPa) and toughness (875 MJ/m3), outperforming the dragline thread. Positive correlation was found between the diameter of MA fibers and supercontraction effect and between the number of MA fibers and tensile strength. These findings might be modeled as a fundamental guide in silk spinning for future synthetic MA silk fiber development with extraordinary mechanical performance.
      1  10