Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration
This study examines the efficacy of bentonite and halloysite in removing caffeine and benzotriazole from aqueous solutions using fixed bed columns. Initially, both micropollutants were removed with high efficiency (98–100 %), but removal degrees decreased markedly after approximately 360 minutes, in...
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| Language: | English |
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Elsevier
2025-04-01
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| Series: | Desalination and Water Treatment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625001298 |
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| author | Gabriela Kamińska Bhautik Dave Augustine Nana Sekyi Appiah Justyna Majewska |
| author_facet | Gabriela Kamińska Bhautik Dave Augustine Nana Sekyi Appiah Justyna Majewska |
| author_sort | Gabriela Kamińska |
| collection | DOAJ |
| description | This study examines the efficacy of bentonite and halloysite in removing caffeine and benzotriazole from aqueous solutions using fixed bed columns. Initially, both micropollutants were removed with high efficiency (98–100 %), but removal degrees decreased markedly after approximately 360 minutes, indicating rapid bed exhaustion and a need for regeneration. Caffeine removal was slightly more effective than benzotriazole, likely due to caffeine's larger molecular weight enhancing its adsorption on clays. The microbial regeneration process, employing Pseudomonas aeruginosa, facilitated significant degradation of adsorbed micropollutants. Benzotriazole was degraded much faster than caffeine, with over 90 % degradation in bentonite within 72 hours and full degradation in halloysite within 96 hours. Caffeine required 168 hours for complete degradation in both materials. The faster degradation of benzotriazole is attributed to its chemical structure and environmental interactions. Post-regeneration, both adsorbents recovered approximately 100 % of their original adsorption capacity. Notably, the BET surface area and density of regenerated adsorbents remained almost consistent with those of their pure, unused forms. This study underscores the effectiveness of microbial regeneration in extending the usability of bentonite and halloysite for continuous purification processes. |
| format | Article |
| id | doaj-art-eecfcf685a884eb7b4e373bd07c4813e |
| institution | DOAJ |
| issn | 1944-3986 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Desalination and Water Treatment |
| spelling | doaj-art-eecfcf685a884eb7b4e373bd07c4813e2025-08-20T03:07:50ZengElsevierDesalination and Water Treatment1944-39862025-04-0132210111310.1016/j.dwt.2025.101113Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regenerationGabriela Kamińska0Bhautik Dave1Augustine Nana Sekyi Appiah2Justyna Majewska3Institute of Water and Wastewater Engineering, Faculty of Environmental Engineering and Energy, Silesian University of Technology, 18 Konarskiego Street, Gliwice 44-100, Poland; Corresponding author.Institute of Water and Wastewater Engineering, Faculty of Environmental Engineering and Energy, Silesian University of Technology, 18 Konarskiego Street, Gliwice 44-100, PolandMaterials Research Laboratory, Faculty of Mechanical Engineering, Silesian University of Technology, 18A Konarskiego Street, Gliwice 44-100, PolandDepartment of Medical Informatics and Artificial Intelligence, Faculty of Biomedical Engineering, Silesian University of Technology, 40 Roosevelta Street, Zabrze 41-800, PolandThis study examines the efficacy of bentonite and halloysite in removing caffeine and benzotriazole from aqueous solutions using fixed bed columns. Initially, both micropollutants were removed with high efficiency (98–100 %), but removal degrees decreased markedly after approximately 360 minutes, indicating rapid bed exhaustion and a need for regeneration. Caffeine removal was slightly more effective than benzotriazole, likely due to caffeine's larger molecular weight enhancing its adsorption on clays. The microbial regeneration process, employing Pseudomonas aeruginosa, facilitated significant degradation of adsorbed micropollutants. Benzotriazole was degraded much faster than caffeine, with over 90 % degradation in bentonite within 72 hours and full degradation in halloysite within 96 hours. Caffeine required 168 hours for complete degradation in both materials. The faster degradation of benzotriazole is attributed to its chemical structure and environmental interactions. Post-regeneration, both adsorbents recovered approximately 100 % of their original adsorption capacity. Notably, the BET surface area and density of regenerated adsorbents remained almost consistent with those of their pure, unused forms. This study underscores the effectiveness of microbial regeneration in extending the usability of bentonite and halloysite for continuous purification processes.http://www.sciencedirect.com/science/article/pii/S1944398625001298Organic micropollutantsAdsorptionClaysMicrobial degradation |
| spellingShingle | Gabriela Kamińska Bhautik Dave Augustine Nana Sekyi Appiah Justyna Majewska Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration Desalination and Water Treatment Organic micropollutants Adsorption Clays Microbial degradation |
| title | Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration |
| title_full | Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration |
| title_fullStr | Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration |
| title_full_unstemmed | Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration |
| title_short | Exploitation of bentonite and halloysite fixed bed columns – Removal of organic micropollutants and microbiological regeneration |
| title_sort | exploitation of bentonite and halloysite fixed bed columns removal of organic micropollutants and microbiological regeneration |
| topic | Organic micropollutants Adsorption Clays Microbial degradation |
| url | http://www.sciencedirect.com/science/article/pii/S1944398625001298 |
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