Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics
Summary: Per- and polyfluoroalkyl substances (PFAS) are increasingly appearing in drinking water sources globally. Our work focuses specifically on the adsorption of the legacy perfluorooctanoic acid (PFOA) using mesoporous hafnium oxide (MHO) ceramic synthesized via a sol-gel process. Experiments w...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-04-01
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| Series: | iScience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589004222004084 |
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| author | Fatima A. Hussain Samuel E. Janisse Marie C. Heffern Maureen Kinyua Jesús M. Velázquez |
| author_facet | Fatima A. Hussain Samuel E. Janisse Marie C. Heffern Maureen Kinyua Jesús M. Velázquez |
| author_sort | Fatima A. Hussain |
| collection | DOAJ |
| description | Summary: Per- and polyfluoroalkyl substances (PFAS) are increasingly appearing in drinking water sources globally. Our work focuses specifically on the adsorption of the legacy perfluorooctanoic acid (PFOA) using mesoporous hafnium oxide (MHO) ceramic synthesized via a sol-gel process. Experiments were performed at varying pH to determine the effect of surface charge on adsorption capacity of PFOA by MHO, and to postulate adsorption behavior. At pH 2.3, the adsorption capacity of PFOA on MHO was 20.9 mg/g, whereas at a higher pH of 6.3, it was much lower at 9.2 mg/g. This was due to increased coulombic attractions at lower pH between the positively charged conjugate acid active sites on MHO surface and negatively charged deprotonated PFOA anion in solution. After adsorption, the solid MHO was regenerated via calcination, reducing the amount of toxic solid waste to be disposed since the adsorbent is regenerated, and the PFOA is completely removed. |
| first_indexed | 2024-04-13T02:33:00Z |
| format | Article |
| id | doaj.art-8e0bd9316e644ca88a0a17c15ff1baee |
| institution | Directory Open Access Journal |
| issn | 2589-0042 |
| language | English |
| last_indexed | 2024-04-13T02:33:00Z |
| publishDate | 2022-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | iScience |
| spelling | doaj.art-8e0bd9316e644ca88a0a17c15ff1baee2022-12-22T03:06:29ZengElsevieriScience2589-00422022-04-01254104138Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramicsFatima A. Hussain0Samuel E. Janisse1Marie C. Heffern2Maureen Kinyua3Jesús M. Velázquez4Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USADepartment of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USADepartment of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USADepartment of Civil & Environmental Engineering, University of California, One Shields Avenue, Davis, CA 95616, USADepartment of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA; Corresponding authorSummary: Per- and polyfluoroalkyl substances (PFAS) are increasingly appearing in drinking water sources globally. Our work focuses specifically on the adsorption of the legacy perfluorooctanoic acid (PFOA) using mesoporous hafnium oxide (MHO) ceramic synthesized via a sol-gel process. Experiments were performed at varying pH to determine the effect of surface charge on adsorption capacity of PFOA by MHO, and to postulate adsorption behavior. At pH 2.3, the adsorption capacity of PFOA on MHO was 20.9 mg/g, whereas at a higher pH of 6.3, it was much lower at 9.2 mg/g. This was due to increased coulombic attractions at lower pH between the positively charged conjugate acid active sites on MHO surface and negatively charged deprotonated PFOA anion in solution. After adsorption, the solid MHO was regenerated via calcination, reducing the amount of toxic solid waste to be disposed since the adsorbent is regenerated, and the PFOA is completely removed.http://www.sciencedirect.com/science/article/pii/S2589004222004084Environmental ChemistryChemical EngineeringMaterials ScienceMaterials Chemistry |
| spellingShingle | Fatima A. Hussain Samuel E. Janisse Marie C. Heffern Maureen Kinyua Jesús M. Velázquez Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics iScience Environmental Chemistry Chemical Engineering Materials Science Materials Chemistry |
| title | Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics |
| title_full | Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics |
| title_fullStr | Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics |
| title_full_unstemmed | Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics |
| title_short | Adsorption of perfluorooctanoic acid from water by pH-modulated Brönsted acid and base sites in mesoporous hafnium oxide ceramics |
| title_sort | adsorption of perfluorooctanoic acid from water by ph modulated bronsted acid and base sites in mesoporous hafnium oxide ceramics |
| topic | Environmental Chemistry Chemical Engineering Materials Science Materials Chemistry |
| url | http://www.sciencedirect.com/science/article/pii/S2589004222004084 |
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