Ku Syahidah Ku Ismail
Thumbnail Image
Preferred name
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

Research Output

Filters

3 2
1
3
2 1
Reset filters

Settings
Now showing 1 - 3 of 3
  • 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.
  • Publication
    Pretreatment of Leucaena Leucocephala Using Deep Eutectic Solvent for Ethanol Production by Kluyveromyces Marxianus UniMAP 1–1
    ( 2023-01-01)
    Ishak M.Z.
    ;
    Khadijah Hanim Abdul Rahman
    ;
    Ahmad Anas Nagoor Gunny
    ;
    Younesi H.
    ;
    Ku Syahidah Ku Ismail
    Conventional pretreatment methods such as alkaline and acid pretreatment which were used in biorefineries to dissolve lignin and hemicellulose faces many drawbacks. These pretreatment methods were considered as toxic not only to the environment, but also to the biomass as further treatment using these solvents will lead to the production of hydroxymethyl furfural (HMF) and furfural, which can inhibit the production of ethanol. Recently, deep eutectic solvents (DES) have grown in popularity as an alternative solvent to substitute conventional pretreatment solvents. DES have a great number of advantages such as biodegradability, non-toxic, low volatility and low cost. Furthermore, DES also is a powerful solvent to dissolve lignin, thus this makes DES a superior solvent to be used in biorefineries compared to alkaline and acid pretreatment. In this study, Leucaena leucocephala seeds and pods were treated with choline chloride – glycerol (ChCl – Gly) based DES at 1:2 molar ratio, and the performance subjected to sugar released and ethanol production were analyzed using high performance liquid chromatography (HPLC). The values were then compared with the conventional pretreatment methods as the controls. The results suggested that DES pretreatment released slightly higher total sugar, 29.28 g/L compared to alkaline and acidic pretreatment at 28.77 and 24.94 g/L, respectively. On the other hand, the yield of ethanol after fermentation in DES treatment were among the highest, which was 0.287 g ethanol/g glucose with 56.27% conversion compared to theoretical yield. The purpose of this report is to offer further information in the interest of making DES as a good replacement for the conventional pretreatment method.
  • 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.
      10  11