Publication:
Adsorption efficiency and photocatalytic activity of silver sulphide-activated carbon (Ag₂S-AC) composites
Adsorption efficiency and photocatalytic activity of silver sulphide-activated carbon (Ag₂S-AC) composites
| cris.virtual.department | Universiti Malaysia Perlis | |
| cris.virtual.department | Universiti Malaysia Perlis | |
| cris.virtual.department | Universiti Malaysia Perlis | |
| cris.virtualsource.department | 63358293-3574-4c52-b33f-74f5f978fe2b | |
| cris.virtualsource.department | 1f2376c8-f05e-473e-adbc-c280ad4dd143 | |
| cris.virtualsource.department | b7d3dcfb-b0f2-49c6-b91a-7c767f33e0fe | |
| dc.contributor.author | Siti Norsaffirah Zailan | |
| dc.contributor.author | Norsuria Mahmed | |
| dc.contributor.author | Aissa Bouaissi | |
| dc.contributor.author | Zahra Ramadlan Mubarokah | |
| dc.contributor.author | Mohd Natashah Norizan | |
| dc.contributor.author | Nurfina Yudasari | |
| dc.contributor.author | Ili Salwani Mohamad | |
| dc.contributor.author | Siti Salwa Mohammad Shirajuddin | |
| dc.date.accessioned | 2026-02-04T04:10:32Z | |
| dc.date.available | 2026-02-04T04:10:32Z | |
| dc.date.issued | 2025 | |
| dc.description.abstract | 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. | |
| dc.identifier.doi | 10.1016/j.inoche.2024.113633 | |
| dc.identifier.uri | https://www.sciencedirect.com/science/article/pii/S138770032401623X | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14170/16009 | |
| dc.language.iso | en | |
| dc.publisher | Elsevier B.V. | |
| dc.relation.ispartof | Inorganic Chemistry Communications | |
| dc.relation.issn | 1387-7003 | |
| dc.subject | Activated carbon | |
| dc.subject | Cu2+ Adsorption | |
| dc.subject | Ground coffee waste | |
| dc.subject | Heavy metal removal | |
| dc.subject | Photocatalytic Degradation | |
| dc.subject | Silver sulphide-activated carbon | |
| dc.title | Adsorption efficiency and photocatalytic activity of silver sulphide-activated carbon (Ag₂S-AC) composites | |
| dc.type | journal-article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 13 | |
| oaire.citation.startPage | 1 | |
| oaire.citation.volume | 171 | |
| oairecerif.author.affiliation | Universiti Malaysia Perlis | |
| oairecerif.author.affiliation | Universiti Malaysia Perlis | |
| oairecerif.author.affiliation | Coventry University, United Kingdom | |
| oairecerif.author.affiliation | Universiti Malaysia Perlis | |
| oairecerif.author.affiliation | Universiti Malaysia Perlis | |
| oairecerif.author.affiliation | National Reasearch and Innovation Agency, Indonesia | |
| oairecerif.author.affiliation | Universiti Malaysia Perlis | |
| oairecerif.author.affiliation | Malaysian Nuclear Agency (Nuclear Malaysia) |
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