Safian, Nur Azmina Mohamed and Nor, R.M. and Rafaie, Hartini Ahmad and Abdul Sani, Siti Fairus and Osman, Zurina (2018) Photocatalytic degradation of methylene blue with silver doped ZnO nanoparticles grown on microscopic sand particles (Degradasi metilena biru menggunakan nanopartikel ZnO sebagai fotomangkin yang didopkan dengan perak tumbuh di atas pasir bersaiz mikro). Malaysian Journal of Analytical Science, 22 (2). pp. 270-278. ISSN 1394-2506, DOI https://doi.org/10.17576/mjas-2018-2202-12.
Full text not available from this repository.Abstract
Pure and Ag doped ZnO nanoparticles were synthesized on microscopic sand particles by sol-gel method. Silver nitrate was used as the doping precursor, Ag doping levels of 1.3 to 7.7 of Ag/Zn ratios were obtained based on energy dispersive X-ray spectroscopy analysis. X-ray diffraction results show that a ZnO (101) peak of Ag doped samples are shifted towards lower degree which around 0.17o compared to pure ZnO NPs, indicating the existence of doping in the Ag doped samples. The pure and Ag doped ZnO samples were used as photocatalysts in the degradation of methylene blue under UV irradiation. Photodegradation efficiency based on the pseudo-first kinetics model gave measured values of the photodegradation rate, k of 8.9, 11.8, 12.7, 14.8 and 17.4 x 10-3 min-1 for pure, 1.3, 1.6, 1.7 and 2.4 of Ag/Zn ratios, respectively. At higher doping levels of 3.3 and 7.7 of Ag/Zn ratios, the k values receded to 12.7 and 12.0 x 10-3 min-1, respectively. The increasing trend on k values can be due to the doping defect levels which trapped the recombining electrons, thus lengthening the lifetime of the electron hole pairs.
| Item Type: | Article |
|---|---|
| Funders: | Institute of Research Management and Monitoring, University of Malaya: postgraduate research grant (Project Code: PG110-2015A), Department of Physics, University of Malaya |
| Uncontrolled Keywords: | Ag doped ZnO; Nanoparticles; Photocatalysis |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 30 Apr 2019 01:28 |
| Last Modified: | 30 Apr 2019 01:28 |
| URI: | http://eprints.um.edu.my/id/eprint/21093 |
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