Norsuria Mahmed
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Preferred name
Norsuria Mahmed
Official Name
Norsuria, Mahmed
Alternative Name
Mahmed, Norsuria
Mahmed, N.
Norsuria, Mahmed
Norsuria, M.
Main Affiliation
Scopus Author ID
24802694300
Researcher ID
FOC-8505-2022

Research Output
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  • Publication
    Adsorption efficiency and photocatalytic activity of silver sulphide-activated carbon (Agâ‚‚S-AC) composites
    (Elsevier B.V., 2025)
    Siti Norsaffirah Zailan
    ;
    Norsuria Mahmed
    ;
    Aissa Bouaissi
    ;
    Zahra Ramadlan Mubarokah
    ;
    Mohd Natashah Norizan
    ;
    Nurfina Yudasari
    ;
    Ili Salwani Mohamad
    ;
    Siti Salwa Mohammad Shirajuddin
    Background: This study investigates the adsorption efficiency and photocatalytic activity of silver sulphide-activated carbon (Ag₂S-AC) composites derived from ground coffee waste (GCW). Methods: In this work, GCW was preceding to carbonized at 500 ± 2°C for hours and formed biochar. Then, GCW was subjected to activation using hydrochloric acid (HCl), phosphoric acid (H₃PO₄) and potassium hydroxide (KOH). The mixture was left to soak for 24 h at room temperature, followed by carbonization at 350 and 500˚C. In the meantime, the silver sulphide (Ag₂S) was synthesized by using an ion exchange method. Sodium sulphide (Na₂S) was used as sulphur source and mixed with silver nitrate (AgNO₃) and sodium citrate (NaCit) for two hours, then dried in oven at 50 ± 2°C for 10 h. Next, the carbonized AC was subsequently combined with synthesized silver sulphide, resulting in the creation of Ag₂S-activated carbon composites that functioned both as adsorbent and photocatalyst. Their capabilities as adsorbents and photocatalyst were studied by using copper ions (Cu2+) and methylene blue (MB) solution. Significance findings: Based on results, GCW and all the prepared activated carbons are in the amorphous phase, except for the Ag₂S-AC composites, where the Ag₂S peak reflection can be observed from the X-ray diffraction (XRD) pattern. GCW shows rough and dense surface morphology. The AC shows different pore sizes and structures depending on the chemical activators used, where AC-KOH shows the largest pore size (165.31 μm). The existence of micropores can be observed in all the activated carbon samples. For the adsorption of Cu2+, all samples show more than 99 % of the removal efficiency. While for photocatalytic testing, the Ag₂S-H₃PO₄ sample shows the highest degradation rate (97.7 %) of MB solutions.