Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies
Activated alumina (Al2O3) has been widely used to remove aqueous anionic pollutants such as phosphate for preventing the eutrophication phenomenon. While Al2O3, as a fine powder material, cannot be stably packed into continuous flow treatment, which limits its practical applications. Herein, we prop...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-06-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/85/11/3315 |
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| author | Huiying Ai Lei Xu Zhiyong Zhang Xiaoya Hu Chen Chen Wenjie Sun Ming-Lai Fu Baoling Yuan |
| author_facet | Huiying Ai Lei Xu Zhiyong Zhang Xiaoya Hu Chen Chen Wenjie Sun Ming-Lai Fu Baoling Yuan |
| author_sort | Huiying Ai |
| collection | DOAJ |
| description | Activated alumina (Al2O3) has been widely used to remove aqueous anionic pollutants such as phosphate for preventing the eutrophication phenomenon. While Al2O3, as a fine powder material, cannot be stably packed into continuous flow treatment, which limits its practical applications. Herein, we proposed a new strategy in which Al2O3 was encapsulated by calcium alginate (CA) to fabricate Al2O3/CA composite, which has relatively large particle size and can be suitable for application in columns. The BET surface area of Al2O3/CA increased to 51.73 m2/g compared with 37.31 m2/g of Al2O3. The maximum adsorption capacity of phosphate on Al2O3/CA was estimated at 1.92-fold compared with that of pure Al2O3 by Langmuir fitting. The main mechanism of phosphate adsorption was the formation of aluminum phosphate precipitation. Moreover, the column studies showed that the adsorption of phosphate on Al2O3/CA was affected by the amount of outer calcium alginate, bed height, influent flow rates and phosphate concentration. This study demonstrated that Al2O3/CA composite has better adsorption capacity and can be used in the dynamic adsorption system as a promising approach for phosphate removal from water. HIGHLIGHTS
Al2O3/CA composite was synthesized by encapsulating Al2O3 in calcium alginate.;
The BET surface area of Al2O3/CA increased 1.39-fold compared with pure Al2O3.;
Al2O3/CA with larger particle size can be easily separated from the water.;
The optimal conditions for dynamic adsorption of in fixed-bed column were investigated.; |
| first_indexed | 2024-12-10T17:21:48Z |
| format | Article |
| id | doaj.art-b1e7493756ce4e0e9712fb795f0389ab |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-12-10T17:21:48Z |
| publishDate | 2022-06-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-b1e7493756ce4e0e9712fb795f0389ab2022-12-22T01:39:58ZengIWA PublishingWater Science and Technology0273-12231996-97322022-06-0185113315333010.2166/wst.2022.173173Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studiesHuiying Ai0Lei Xu1Zhiyong Zhang2Xiaoya Hu3Chen Chen4Wenjie Sun5Ming-Lai Fu6Baoling Yuan7 Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Department of Atmosperic and Hydrologic Science, St. Cloud State University, 720 4th Avenue South, St. Cloud, MN 56301, United States of America Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Xiamen Key Laboratory of Municipal and Industrial Solid Waste Utilization and Pollution Control, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, P.R. China Activated alumina (Al2O3) has been widely used to remove aqueous anionic pollutants such as phosphate for preventing the eutrophication phenomenon. While Al2O3, as a fine powder material, cannot be stably packed into continuous flow treatment, which limits its practical applications. Herein, we proposed a new strategy in which Al2O3 was encapsulated by calcium alginate (CA) to fabricate Al2O3/CA composite, which has relatively large particle size and can be suitable for application in columns. The BET surface area of Al2O3/CA increased to 51.73 m2/g compared with 37.31 m2/g of Al2O3. The maximum adsorption capacity of phosphate on Al2O3/CA was estimated at 1.92-fold compared with that of pure Al2O3 by Langmuir fitting. The main mechanism of phosphate adsorption was the formation of aluminum phosphate precipitation. Moreover, the column studies showed that the adsorption of phosphate on Al2O3/CA was affected by the amount of outer calcium alginate, bed height, influent flow rates and phosphate concentration. This study demonstrated that Al2O3/CA composite has better adsorption capacity and can be used in the dynamic adsorption system as a promising approach for phosphate removal from water. HIGHLIGHTS Al2O3/CA composite was synthesized by encapsulating Al2O3 in calcium alginate.; The BET surface area of Al2O3/CA increased 1.39-fold compared with pure Al2O3.; Al2O3/CA with larger particle size can be easily separated from the water.; The optimal conditions for dynamic adsorption of in fixed-bed column were investigated.;http://wst.iwaponline.com/content/85/11/3315active aluminaadsorptioncalcium alginatecolumn studiesphosphorus |
| spellingShingle | Huiying Ai Lei Xu Zhiyong Zhang Xiaoya Hu Chen Chen Wenjie Sun Ming-Lai Fu Baoling Yuan Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies Water Science and Technology active alumina adsorption calcium alginate column studies phosphorus |
| title | Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies |
| title_full | Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies |
| title_fullStr | Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies |
| title_full_unstemmed | Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies |
| title_short | Al2O3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions: batch and column studies |
| title_sort | al2o3 encapsulated by calcium alginate as composite for efficient removal of phosphate from aqueous solutions batch and column studies |
| topic | active alumina adsorption calcium alginate column studies phosphorus |
| url | http://wst.iwaponline.com/content/85/11/3315 |
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