Ili Salwani Mohamad
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Preferred name
Ili Salwani Mohamad
Official Name
Mohamad, Ili Salwani
Alternative Name
Salwani, Iii
Salwani Mohamad, Ili
Mohamad, I. S.B.
Mohamad, I. S.
Smohamad, I.
Ili, Salwani Mohamad
Bintimohamad, Ilisalwani
Main Affiliation
Scopus Author ID
55898400600
Researcher ID
ABS-3594-2022

Research Output
Now showing 1 - 1 of 1
  • 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.