Razali, Nur Syafiqa Hazirah and Mukhair, Hayati Mohamad and Lee, Kian Mun and Saiman, Mohd Izham and Abdullah, Abdul Halim (2022) Effect of solution pH on the photo-oxidation of 4-chlorophenol by synthesized silver-zinc oxide photocatalyst. Indonesian Journal of Chemistry, 22 (3). pp. 805-817. ISSN 14119420, DOI https://doi.org/10.22146/ijc.71763.
Full text not available from this repository.Abstract
Due to its toxicity, 4-chlorophenol (4CP) must be removed from the wastewater before discharging into open water. In this work, ZnO and Ag-ZnO photocatalysts were prepared via a solvothermal method under mild conditions (150 °C), followed by calcination at 300 °C and then characterized. The addition of Ag resulted in a change of the ZnO morphologies, which exhibited wurtzite structure, from irregular to rod-like shape, lower bandgap energy, and a lower electron-hole recombination rate. The 0.6 Ag-ZnO catalyst showed the highest efficiency in the photooxidation of 4CP under UV irradiation. Molecular 4CP exists in acidic and near-neutral conditions (pH 4 and 6) and is stable towards UV irradiation. Photooxidation of 2.3 × 10–4 mol/L 4CP by 0.8 g of 0.6 Ag-ZnO resulted in 67 removal of molecular 4CP at pH 6 with a rate constant of 4.0 × 10–3 min–1. Under similar conditions, a complete photooxidation of the anionic 4CP was observed at pH 11 with a rate constant of 1.4 × 10–2 min–1. The holes and superoxide radicals are the species responsible for molecular 4CP photoooxidation, while hydroxyl radicals are the dominant species for anionic 4CP. The prepared Ag/ZnO photocatalyst exhibit good potential to efficiently oxidize 4CP in both acidic and alkaline conditions. © 2022, Gadjah Mada University. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education, Malaysia [Grant No: FRGS/FASA1-2011/(SG)/(UPM)/(02/38], Institut Teknologi Maju, Universiti Putra Malaysia |
| Additional Information: | All Open Access, Gold Open Access |
| Uncontrolled Keywords: | 4-chlorophenol; Ag-ZnO; Endocrine disruptor chemicals; Photocatalyst; Photooxidation |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 15 Aug 2025 06:35 |
| Last Modified: | 15 Aug 2025 06:35 |
| URI: | http://eprints.um.edu.my/id/eprint/43786 |
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