Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand
An aluminum–magnesium–calcium-coated sand (AMCCS) sorbent was evaluated as a low-cost ternary metal oxide adsorbent for adsorption and removal of fluoride from water with potential application in flow-through water filtration systems. The AMCCS sorbent coating contained mostly amorphous oxides of al...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-11-01
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| Series: | Water Supply |
| Subjects: | |
| Online Access: | http://ws.iwaponline.com/content/23/11/4699 |
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| author | Kiana Modaresahmadi Amid P. Khodadoust James Wescott |
| author_facet | Kiana Modaresahmadi Amid P. Khodadoust James Wescott |
| author_sort | Kiana Modaresahmadi |
| collection | DOAJ |
| description | An aluminum–magnesium–calcium-coated sand (AMCCS) sorbent was evaluated as a low-cost ternary metal oxide adsorbent for adsorption and removal of fluoride from water with potential application in flow-through water filtration systems. The AMCCS sorbent coating contained mostly amorphous oxides of aluminum, magnesium, and calcium. The adsorption of fluoride occurred in less than an hour, while fluoride adsorption followed pseudo-second-order kinetics. The favorable adsorption of fluoride onto the AMCCS sorbent occurred according to the Langmuir and Freundlich adsorption equations, whereas the physical adsorption of fluoride onto the AMCCS sorbent occurred based on the Dubinin–Radushkevich adsorption equation. The adsorption of fluoride occurred over a broad pH range from 2 to 10.5 with a decrease in adsorption at pH above 10.5, indicative of the adsorption of fluoride onto the positively charged surface of AMCCS sorbent at pH below the AMCCS sorbent pHPZC of 10.4. The AMCCS sorbent was able to remove fluoride from natural waters with appreciable alkalinity, total hardness and total dissolved solids, indicative of AMCCS sorbent selectivity for fluoride adsorption. The AMCCS sorbent was re-coated and reused after several adsorption cycles, rendering the AMCCS sorbent a recyclable and sustainable adsorbent for effective and rapid removal of fluoride from water.
HIGHLIGHTS
The Al–Mg–Ca ternary metal oxide-coated sand (AMCCS) sorbent removed fluoride from water over a broad pH range from 2 to 10.5, which was capable of adsorbing fluoride from acidic and neutral-alkaline solutions.;
The AMCCS sorbent removed fluoride from natural waters with different ionic strengths, indicative of high fluoride selectivity.;
The AMCCS sorbent was re-coated and recycled for the sustainable and rapid removal of fluoride.; |
| first_indexed | 2024-03-09T08:57:45Z |
| format | Article |
| id | doaj.art-0aac32cad4584eefbe08ad8161fee8a8 |
| institution | Directory Open Access Journal |
| issn | 1606-9749 1607-0798 |
| language | English |
| last_indexed | 2024-03-09T08:57:45Z |
| publishDate | 2023-11-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Supply |
| spelling | doaj.art-0aac32cad4584eefbe08ad8161fee8a82023-12-02T12:34:35ZengIWA PublishingWater Supply1606-97491607-07982023-11-0123114699471310.2166/ws.2023.269269Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sandKiana Modaresahmadi0Amid P. Khodadoust1James Wescott2 Department of Civil, Materials and Environmental Engineering, University of Illinois Chicago, Chicago, IL, USA Department of Civil, Materials and Environmental Engineering, University of Illinois Chicago, Chicago, IL, USA Department of Civil, Materials and Environmental Engineering, University of Illinois Chicago, Chicago, IL, USA An aluminum–magnesium–calcium-coated sand (AMCCS) sorbent was evaluated as a low-cost ternary metal oxide adsorbent for adsorption and removal of fluoride from water with potential application in flow-through water filtration systems. The AMCCS sorbent coating contained mostly amorphous oxides of aluminum, magnesium, and calcium. The adsorption of fluoride occurred in less than an hour, while fluoride adsorption followed pseudo-second-order kinetics. The favorable adsorption of fluoride onto the AMCCS sorbent occurred according to the Langmuir and Freundlich adsorption equations, whereas the physical adsorption of fluoride onto the AMCCS sorbent occurred based on the Dubinin–Radushkevich adsorption equation. The adsorption of fluoride occurred over a broad pH range from 2 to 10.5 with a decrease in adsorption at pH above 10.5, indicative of the adsorption of fluoride onto the positively charged surface of AMCCS sorbent at pH below the AMCCS sorbent pHPZC of 10.4. The AMCCS sorbent was able to remove fluoride from natural waters with appreciable alkalinity, total hardness and total dissolved solids, indicative of AMCCS sorbent selectivity for fluoride adsorption. The AMCCS sorbent was re-coated and reused after several adsorption cycles, rendering the AMCCS sorbent a recyclable and sustainable adsorbent for effective and rapid removal of fluoride from water. HIGHLIGHTS The Al–Mg–Ca ternary metal oxide-coated sand (AMCCS) sorbent removed fluoride from water over a broad pH range from 2 to 10.5, which was capable of adsorbing fluoride from acidic and neutral-alkaline solutions.; The AMCCS sorbent removed fluoride from natural waters with different ionic strengths, indicative of high fluoride selectivity.; The AMCCS sorbent was re-coated and recycled for the sustainable and rapid removal of fluoride.;http://ws.iwaponline.com/content/23/11/4699adsorptionaluminumcalciumfluoridemagnesiumternary metal oxide |
| spellingShingle | Kiana Modaresahmadi Amid P. Khodadoust James Wescott Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand Water Supply adsorption aluminum calcium fluoride magnesium ternary metal oxide |
| title | Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand |
| title_full | Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand |
| title_fullStr | Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand |
| title_full_unstemmed | Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand |
| title_short | Adsorption of fluoride from water using Al–Mg–Ca ternary metal oxide-coated sand |
| title_sort | adsorption of fluoride from water using al mg ca ternary metal oxide coated sand |
| topic | adsorption aluminum calcium fluoride magnesium ternary metal oxide |
| url | http://ws.iwaponline.com/content/23/11/4699 |
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