Mohd Hanif Mohd Pisal
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Preferred name
Mohd Hanif Mohd Pisal
Official Name
Mohd Hanif , Mohd Pisal
Alternative Name
Mohd Pisal , Mohd Hanif
Pisal, Mohamad Hanif Mohd
Pisal, M. H.M.
Main Affiliation
Scopus Author ID
56239228100
Researcher ID
GFX-4850-2022

Research Output
Now showing 1 - 2 of 2
  • Publication
    Green synthesis and characterization of Graphene quantum dots from key lime juice
    (Springer, 2023)
    Nur Atirah Afifah Sezali
    ;
    Siew Suan Ng
    ;
    Ong Hui Lin
    ;
    Al Rey Villagracia
    ;
    Mohd Hanif Mohd Pisal
    ;
    Ruey-An Doong
    Graphene quantum dots (GQDs) are one of the members of graphene family with unique properties such as quantum confinement effect, photoluminescence effect, and strong conductivity. This work prepared the GQDs using lime juice obtained from the waste of locally grown key limes as the precursor. The hydrothermal method was used in the preparation of the GQDs. The fluorescence effect of the GQDs was observed under a UV lamp irradiation while other characterization was conducted using high-resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), X-ray powder diffraction (XRD), and Raman spectroscopy. The GQD preparation was successful with the emission of a strong blue color when the GQD was put under a 365 nm UV light irradiation. It was found that the particle size of the prepared GQDs was in the range of 0.7–2.8 nm with an average diameter of 1.3 ± 0.5 nm. The characterization results proved the formation of GQDs as one of the graphene nanomaterials.
  • Publication
    Preparation and characterization of cellulose acetate from rice straw
    (Springer, 2023)
    Nur Atirah Afifah Sezali
    ;
    Ong Hui Lin
    ;
    Mohd Hanif Mohd Pisal
    ;
    Nora Jullok
    ;
    Maria Carla Manzano
    ;
    Al Rey Villagracia
    ;
    Ruey-an Doong
    Rice straw is one of the agricultural crop residues, and it can be utilized for its rich cellulose content. This work extracted cellulose from the locally collected rice straw and prepared the cellulose acetate from the rice straw-derived cellulose. The cellulose was isolated by an extraction process using an alkaline deep eutectic solvent, followed by bleaching to remove lignin and hemicellulose, and lastly the purification of cellulose for efficient acetylation process. The prepared cellulose acetate was characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), and differential scanning calorimetry (DSC) to confirm the successful acetylation of cellulose. The properties of the prepared cellulose acetate were compared with the commercial cellulose acetate. The FTIR result confirmed the replacement of hydroxyl groups on cellulose structure by the acetyl groups while the XRD analysis has resulted in the crystallinity index of 25.7% for the prepared cellulose acetate. As one of the cellulose derivatives, the cellulose acetate prepared from the rice straw-derived cellulose showed better thermal properties as the melting temperature was found to be more than 300 °C.
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