Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation
Also available in printed version
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| Format: | Doctoral thesis |
| Language: | English |
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Universiti Teknologi Malaysia
2025
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| Online Access: | https://utmik.utm.my/handle/123456789/40113 |
| Abstract | Abstract here |
| _version_ | 1854975055423864832 |
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| author | Nurafiqah Rosman |
| author2 | Wan Norharyati Wan Salleh, supervisor |
| author_facet | Wan Norharyati Wan Salleh, supervisor Nurafiqah Rosman |
| author_sort | Nurafiqah Rosman |
| description | Also available in printed version |
| format | Doctoral thesis |
| id | utm-123456789-40113 |
| institution | Universiti Teknologi Malaysia |
| language | English |
| publishDate | 2025 |
| publisher | Universiti Teknologi Malaysia |
| record_format | dspace |
| record_pdf | Abstract |
| spelling | utm-123456789-401132025-08-20T20:55:05Z Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation Nurafiqah Rosman Wan Norharyati Wan Salleh, supervisor Chemical engineering Also available in printed version The use of Ibuprofen (IBF), one of the most prescribed nonsteroidal anti-inflammatory drugs (NSAIDs), has raised environmental concerns due to its potentially mutagenic and genotoxic effects. Thus, the development of photocatalytic membranes using mixed matrix membranes (MMMs) is introduced as a new way to filter and degrade contaminants simultaneously. The incorporation of visible-light driven photocatalyst in membrane matrix has gained numerous attentions recently. Hence, novel visible light driven of ZnO/Ag2CO3/Ag2O photocatalyst had been successfully synthesized via the facile two-step synthesis method. The phase transformation from Ag2CO3 to Ag2O over ZnO surfaces was observed in different phase structures and the O atom possessed by Ag2O had diffused towards the Ag2CO3 surface, signifying the presence of Ag2CO3/Ag2O heterostructure over the ZnO. The result indicates that the ZnO/Ag2CO3/Ag2O heterojunction exhibited a 99.3% photodegradation of IBF solution under visible-light irradiation, with 10-fold higher reaction rate compared to the pristine ZnO. Compact interfacial heterojunction in ZnO/Ag2CO3/Ag2O sample had promoted visible-light absorption and effective interfacial charge transfers due to synergistic effect of Ag2CO3/Ag2O heterostructure. In this regard, the IBF photocatalytic performance was further examined by incorporating the ZnO/Ag2CO3/Ag2O photocatalyst in polyvinylidene difluoride (PVDF) membrane matrix. Porous PVDF pristine membrane and photocatalytic MMMs incorporated with 0.5–2.91 wt% of ZnO/Ag2CO3/Ag2O photocatalyst were produced in the UF range. The resulting PVDF-ZnO/Ag2CO3/Ag2O membrane with rougher membrane surface area and excellent light harvesting capability showed higher photocatalytic-filtration activity in removing IBF under visible-light irradiations. The MMMs fluxes demonstrated higher IBF fluxes of its initial flux in certain duration. This indicates that the membrane actively responds to light irradiation. The increase of positive flux could be attributed to the photoinduced hydrophilicity generated by ZnO/Ag2CO3/Ag2O photocatalyst, resulting in easier water layer formation and rapid transport through membranes. The highest IBF removal was demonstrated by PVDF-ZAA2 membrane (1.96 wt% of loading) with 49.96% of IBF removal within 180 minutes upon visible-light irradiation. The reason for this lower IBF removal is that UF membrane pores exceed the size of IBF molecules, thereby preventing the size exclusion mechanism. Thus, charge repulsion, hydrophobic adsorption, and photocatalytic activity were considered along with IBF removal of photocatalytic membranes. However, the recyclability of the PVDF-ZAA2 photocatalytic membrane has a great improvement with 99.01% of IBF removal recovery after three-time recyclability. These results highlighted the potential of such hybrid membranes in mitigating membrane fouling by providing a platform for photocatalysts to continuously degrade pollutants present in such wastewaters. Therefore, hybridization of photocatalysts and membrane provided insight that could be utilized to improve and retrofit the current water effluent treatment methods. fahmimoksen UTM 216 p. Thesis (Doktor Falsafah (Kejuruteraan Kimia)) - Universiti Teknologi Malaysia, 2022 2025-03-06T06:54:38Z 2025-03-06T06:54:38Z 2022 Doctoral thesis https://utmik.utm.my/handle/123456789/40113 vital:150659 valet-20230222-151544 ENG Closed Access UTM Complete Unpublished Completion application/pdf Universiti Teknologi Malaysia |
| spellingShingle | Chemical engineering Nurafiqah Rosman Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| thesis_level | PhD |
| title | Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| title_full | Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| title_fullStr | Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| title_full_unstemmed | Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| title_short | Synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| title_sort | synthesis of enhanced zinc oxide based material photocatalyst for ibuprofen degradation |
| topic | Chemical engineering |
| url | https://utmik.utm.my/handle/123456789/40113 |
| work_keys_str_mv | AT nurafiqahrosman synthesisofenhancedzincoxidebasedmaterialphotocatalystforibuprofendegradation |